Online Ordering
/Best Online Ordering Platforms for Cambridge Restaurants (2026)
An independent comparison of the leading online ordering platforms for Cambridge restaurants, takeaways, cafés, and food businesses
Oliver Hartley · Published 21 October 2026
Compare the best online ordering platforms for Cambridge restaurants in 2026, including Flipdish, GloriaFood, Hungrrr, OrderYOYO, Square, and Slerp.
Cambridge is one of the most competitive restaurant markets in the UK relative to its size. With roughly 130,000 residents, two universities drawing more than 24,000 students, a thriving technology economy, and hundreds of thousands of tourists arriving every year for college tours and punting season, the footfall in this city is disproportionate to a place you can cycle across in twenty minutes. Mill Road alone has earned a national reputation as one of the best streets for independent food and drink in England. Bridge Street, King Street, and the city centre carry dense competition for every cover, every collection, and every delivery.
That makes Cambridge an excellent place to run a restaurant and a genuinely demanding place to grow one. The three major delivery marketplaces — Just Eat, Deliveroo, and Uber Eats — are all active across the city and its surrounding villages, and they are where most Cambridge diners currently start a food search. The problem is cost. Paying 25 to 35 per cent commission on every marketplace order is not a sustainable business model. It is a customer-acquisition cost that never decreases, and it transfers both the customer relationship and the data to the marketplace rather than to you.
The best online ordering platforms let Cambridge restaurants take orders directly — through their own branded website, a dedicated app, Google Search, or a QR code — with no commission per order. Keeping the margin is only half the value. The more durable benefit is keeping the customer: their contact details, their order history, and the ability to bring them back with loyalty rewards and marketing without paying a third party to reach them. The strongest platforms also connect those direct orders to the restaurant's POS, kitchen, and reporting in real time, which is what turns an ordering channel into a genuine operational and commercial advantage.
This guide compares the six best online ordering platforms available to Cambridge restaurants in 2026. We assessed each on cost and fee structure, how well it supports commission-free direct ordering, whether it connects to in-house operations, ease of setup, and how well it fits the range of operators running businesses across the city — from busy Mill Road independents to student-area takeaways to quality-led city-centre dining. The result is a clear winner. Flipdish takes the top spot because it is the only platform here that connects your own branded direct ordering website and app to a full restaurant operating system — POS, payments, kiosks, loyalty, marketing, and delivery — in one place built specifically for hospitality operators.
That said, the right platform depends on your venue type, order volume, and how much of your operation you want to connect. If you are researching the broader UK market, our best online ordering systems UK guide and our best restaurant apps guide cover the full landscape. Read on for full Cambridge-specific breakdowns of all six.
The best online ordering platforms for Cambridge restaurants at a glance
- Flipdish: best connected platform for Cambridge restaurants wanting direct orders alongside full operational control
- GloriaFood: best free entry point for Cambridge independents starting out with direct ordering
- Hungrrr: best low-cost branded ordering app and website with 0% commission
- OrderYOYO: best done-for-you branded app and marketing for Cambridge takeaways
- Square: best simple, affordable ordering for Cambridge cafés and small operators already on Square
- Slerp: best premium white-label ordering for quality-led Cambridge independents and brands
Prices are as published by each provider for the UK and Ireland market at the time of writing. Where pricing is not publicly available, this is noted and quote-based pricing is indicated. Scores reflect our editorial assessment across the criteria detailed at the end of this guide.
/quick comparison
| Vendor | Best for | Pricing From | Key Strengths | Overall Score |
|---|---|---|---|---|
| Flipdish | Connected platform for direct ordering and full operations | From €69/month (per site, billed annually) | Branded app, web ordering, POS, kiosks, loyalty, marketing, delivery, marketplace aggregation | 4.8 |
| GloriaFood | Free direct ordering for Cambridge independents | Free core (app and card payments are paid add-ons) | Free unlimited orders, no commission, QR ordering, table reservations, promotions | 4.0 |
| Hungrrr | 0% commission branded app with no long contract | Quote-based low monthly subscription | Branded iOS and Android app, 0% commission, loyalty, push marketing, broad EPOS integration | 4.2 |
| OrderYOYO | Done-for-you app and marketing for Cambridge takeaways | Commission on weekly revenue (quote-based) | Managed branded app and website, Cloud POS, Google Ads support, UK and Ireland focus | 3.9 |
| Square | Simple ordering for Cambridge cafés already on Square | Free (1.4% + 25p UK online) | Free plan, clean ordering page, click-and-collect, QR ordering, integrated payments | 3.8 |
| Slerp | Premium white-label ordering for quality-led brands | Quote-based monthly fee | White-label ordering, Apple Pay, Google Pay, courier dispatch, CRM, strong conversion | 4.3 |
/top 6 platforms
01. Flipdish
Flipdish is an all-in-one restaurant management platform used by more than 5,000 brands worldwide, built around giving restaurants a direct ordering channel that they own and control. Its software combines branded website ordering and iOS and Android apps, Order with Google, a restaurant-grade POS, integrated payments, self-service kiosks, a kitchen display system, delivery management, loyalty, vouchers, and customer marketing — all in one connected platform, built specifically for hospitality operators.
Starting software price: From €69/month (per site, billed annually; €89 monthly). Transaction fees from: Quote-based through Flipdish Pay.
For Cambridge restaurants that are paying commission to Just Eat, Deliveroo, and Uber Eats on every order, Flipdish's model is the clearest alternative. Customers order directly from your own website or branded app, and you keep the margin, the data, and the relationship. Every one of those direct orders flows immediately into the same system managing your POS, kitchen display, and reporting — no re-keying, no stack of delivery tablets on the counter, no end-of-day reconciliation headache.
The connected model is particularly valuable in Cambridge's competitive independent market. A Mill Road operator managing lunch covers and evening delivery alongside each other, or a city-centre restaurant handling tourist footfall and late student orders, gets a single view of every channel in one dashboard. Flipdish's built-in loyalty and marketing tools let you push offers straight to customers who have already ordered from you, run targeted voucher campaigns, and bring lapsed regulars back — using data you own rather than data locked inside a marketplace account. Push notifications to app users are free, which is a materially cheaper marketing channel than paying for reach on Just Eat or Meta.
If you continue selling through Deliveroo, Just Eat, or Uber Eats alongside your direct channel, Flipdish aggregates those marketplace orders into the same view as your direct orders, giving you a clear picture of your channel split and a practical path to growing the direct share over time. For a multi-location operator — a Cambridge group expanding from Mill Road to a second site across the city — that multi-site management capability scales cleanly without adding operational complexity.
The honest limitation is that Flipdish delivers its strongest value as a connected system. If you only want a basic ordering widget and nothing more, narrower tools will cost less. But for any Cambridge restaurant treating direct ordering as a genuine commercial strategy rather than a nice-to-have, the connected model is the point.
Software pricing: Essentials from €69/month annually (€89 monthly). Pro from €99/month annually (€129 monthly). Advanced from €199/month annually (€249 monthly). Hardware and transaction fees are quote-based through Flipdish Pay.
- Branded iOS and Android app connected to web ordering, POS, kiosks, and delivery in one system
- No marketplace commission on direct orders — you keep the full margin
- Loyalty, vouchers, and push-notification marketing built in to drive repeat orders
- Full customer data ownership, not locked inside a third-party marketplace
- Marketplace order aggregation so you can manage and grow the direct channel share
- Scales cleanly from a single Cambridge site to a growing multi-location group
- More than a very small operator needs if they only want a basic ordering button
- Delivers strongest value as a connected platform rather than a single feature
- Transaction and hardware pricing is quote-based rather than a publicly listed rate card
Best for: Cambridge restaurants, takeaways, and growing operators that want a branded direct ordering channel connected to a full operating system, including POS, loyalty, delivery, and customer marketing.
View full profile →02. GloriaFood
GloriaFood, now part of Oracle, is the most widely used entry-level online ordering system globally, with more than 20,000 restaurants across 100 countries. For Cambridge independents looking for the lowest-risk way to start accepting direct orders before committing to a monthly subscription, it is hard to beat on price. The core is free, with no commission and no order limits.
Starting software price: Free core. Transaction fees from: Card payment acceptance is a paid add-on; a branded mobile app is a paid upgrade.
The free plan covers online ordering for delivery, takeaway, and dine-in, table reservations, pre-orders, promotions, a QR ordering widget, and a basic customer database — all commission-free. For a café on Mill Road or a small independent in the CB2 area running tight margins, the ability to start taking direct orders with zero monthly cost is genuinely useful. A branded mobile app is available as a paid add-on when you are ready to invest more.
The honest picture is that GloriaFood is an ordering tool rather than an operating platform. The branded app add-on puts your restaurant on a customer's phone, but it does not bring the connected loyalty, push-notification marketing, and operational depth of a platform like Flipdish. Card payment processing and the branded app both sit behind paid add-ons, so the true monthly cost climbs once you move past the free basics. As a starting point it is excellent — particularly for a Cambridge independent that wants to test direct ordering before investing in a higher-cost platform. As a long-term strategy for an operator serious about growing a direct customer base, most will outgrow it.
Pricing: Free core online ordering with unlimited orders and no commission. Branded mobile app, card payments, and marketing are paid add-ons. Optional POS bundle available.
- Genuinely free core plan with no commission and unlimited orders
- Covers delivery, takeaway, dine-in, reservations, pre-orders, and QR ordering
- Lowest-risk way for a Cambridge independent to start taking direct orders
- Branded mobile app available as a paid upgrade when ready
- An ordering tool rather than a full operating platform
- Card payments and branded app require paid add-ons
- Lacks the connected loyalty, marketing, and operational depth of dedicated platforms
- Limited customer marketing tools compared to higher-tier solutions
Best for: Small Cambridge restaurants, cafés, and takeaways that want a free, zero-commitment way to start accepting direct orders before investing in a full branded app or platform.
View full profile →03. Hungrrr
Hungrrr provides branded ordering apps and websites for hospitality businesses across the UK and Ireland, from independent restaurants and takeaways to hotels and stadiums. Its appeal to Cambridge operators is straightforward: a low-cost monthly subscription with 0% commission on every order, meaning you keep the full margin on direct orders rather than paying a percentage on revenue that is already yours.
Starting software price: Quote-based low monthly subscription. Transaction fees from: 0% commission on orders; standard card processing rates apply separately.
The maths is the point. You pay a fixed monthly fee for your own branded iOS and Android app and ordering website, and Hungrrr takes no cut of what customers spend. The platform covers click-and-collect, home delivery using your own drivers or delivery partners, table ordering, and QR ordering. A points-based loyalty scheme, free push-notification marketing, full menu control from a single dashboard, and next-banking-day settlement make it a genuinely capable package for any Cambridge restaurant focused on growing direct orders without operational complexity.
There is no lengthy contract, which lowers the cost of trying it — a meaningful advantage for operators uncertain whether their customer base will take to a branded app. It integrates with a wide range of EPOS systems, which matters for restaurants already running another POS in their Cambridge site.
The trade-offs sit in customisation and depth. You cannot fully customise every aspect of the mobile ordering experience, and some advanced features are paid extras that raise the all-in monthly cost above the headline figure. As a focused ordering platform rather than a full operating system, it does not match the breadth of Flipdish. But for a Cambridge operator who specifically wants an affordable branded app with 0% commission and no long-term tie-in, it is a strong and practical choice.
Pricing: Subscription model, quote-based monthly fee. 0% commission on orders. Standard card processing charges apply. No lengthy contract.
- 0% commission on all orders — keep the full margin on every direct sale
- Branded iOS and Android app on a low-cost monthly subscription
- Click-and-collect, delivery, table ordering, and QR ordering covered
- Points loyalty, push-notification marketing, and next-banking-day settlement
- No lengthy contract and broad EPOS integration across UK systems
- Limited customisation of the mobile and QR ordering experience
- Advanced features sit behind paid add-ons that raise the real monthly cost
- Not a full operating platform — less integration depth than Flipdish
- Pricing is quote-based rather than publicly listed
Best for: Cambridge restaurants, takeaways, and hospitality operators that want an affordable 0% commission branded app with no long contract commitment.
View full profile →04. OrderYOYO
OrderYOYO is a UK- and Ireland-focused branded ordering platform built for local takeaways, with more than 13,000 restaurant partners and an operations office in Manchester. Its done-for-you model — branded app, branded website, Cloud POS, and managed marketing support — makes it a practical option for Cambridge takeaway operators who do not want to manage app development, updates, and Google advertising in-house.
Starting software price: Commission on weekly app and website revenue (quote-based; the rate falls as weekly revenue grows). Transaction fees from: A small consumer service fee of around £0.50 per web and app order, charged to the customer.
OrderYOYO sets up your branded iOS and Android app, your ordering website, your Cloud POS, and Google search ads — then manages them for you. The commission-banded model means you pay a lower percentage as your weekly revenue grows, and it is calculated weekly so you always pay the lowest applicable rate. For a busy Cambridge takeaway serving the student market around Petersfield or the residential areas of Romsey and Coleridge, the managed approach can remove a significant overhead.
The honest caveats apply. You pay commission on customers who are already yours, which makes the cost difficult to compare cleanly against flat-fee alternatives like Hungrrr — model your expected weekly app revenue carefully. Reviews from operators are uneven, and the commission structure is difficult to pin down without a sales conversation. The roughly £79 annual Apple developer account fee for the branded iOS app is an often-missed extra. Compare the all-in cost against fixed-fee platforms before committing.
Pricing: Weekly commission on app and website revenue, banded by volume so higher revenue attracts a lower rate. Quote-based. Branded app, website, Cloud POS, and marketing support included.
- Done-for-you branded app and website setup and management
- Cloud POS and Google Ads support included in the package
- Commission rate falls as weekly revenue grows
- Strong UK and Ireland market focus with direct customer contact
- Commission charged on customers who are already yours
- Pricing is opaque without a sales conversation
- Uneven customer reviews compared to platform peers
- Roughly £79 annual Apple developer cost is easily missed
Best for: Cambridge takeaway operators that want their branded app, website, POS, and marketing set up and managed for them, and who are comfortable with a revenue-commission model.
View full profile →05. Square
Square is used by millions of businesses globally and is the most natural starting point for Cambridge cafés, bakeries, and small casual restaurants already using Square for payments or their point of sale. It does not offer a full native branded mobile app in the way the dedicated ordering platforms do, but its online ordering page, click-and-collect, and QR ordering give smaller Cambridge operators a clean and low-friction direct-ordering channel without a major implementation project.
Starting software price: Free plan. Transaction fees from: 1.4% + 25p UK online; 1.75% in-person.
Square's appeal in Cambridge's busy independent café market is ease. Many operators already use Square for card payments or a basic POS, so adding online ordering is a natural extension rather than a separate project with a new provider. Square Online provides a tidy ordering page that works reliably for click-and-collect and QR code table ordering, with integrated payments in the same ecosystem. The genuinely free plan removes any commitment risk, and the Plus plan adds more takeaway-focused features when you need them.
The limitation is depth. Square is an ordering page rather than a branded app: customers do not get an icon on their home screen, and Square lacks the loyalty scheme, push-notification marketing, and customer data ownership tools that drive repeat orders on dedicated platforms. For a small Cambridge café that wants simple, reliable online ordering already integrated with their Square payment stack, it is a sensible and affordable choice. For an operator whose growth strategy depends on building a branded direct-order customer base with repeat-purchase marketing, it will not be sufficient on its own.
Pricing: Free plan. Square for Restaurants Plus: £69/month per location. Transaction fees: 1.75% in-person, 1.4% + 25p UK online. 30-day free trial on paid plans.
- Genuinely free plan to get started with no monthly commitment
- Clean, modern ordering page that is quick to set up
- Click-and-collect, QR ordering, and integrated card payments
- Ideal for operators already using Square POS and payments
- Transparent, publicly listed pricing
- No native branded mobile app like dedicated ordering platforms
- Lacks loyalty, push-notification marketing, and customer data tools
- Less suited to operators whose growth strategy depends on a branded app
- Transaction fees mean cost rises proportionally with order volume
Best for: Cambridge cafés, bakeries, and small casual restaurants already using Square that want simple, integrated online ordering without a new platform setup.
View full profile →06. Slerp
Slerp is a UK-built ordering platform designed for restaurants, bakeries, cafés, and food brands that care about brand presentation and customer experience. Its fully white-label ordering setup — commission-free, with Apple Pay, Google Pay, push notifications, and an optional branded app — makes it a strong fit for Cambridge's quality-led independent restaurants that want their direct ordering experience to genuinely reflect the standard of their food and service.
Starting software price: Quote-based monthly fee. Transaction fees from: Competitive processing rates; commission-free on all orders.
Slerp's proposition is a single monthly fee instead of per-order commission, full ownership of the customer relationship, and an ordering experience that converts well. The white-label setup carries your brand throughout the customer journey, supports fast checkout with Apple Pay and Google Pay, sends push notifications to bring customers back, and handles click-and-collect, catering orders, and pre-orders. Slerp claims its direct ordering converts around seven times better than the industry average, with a meaningfully higher average order value than marketplace alternatives. Courier dispatch is available through partners including Uber and Stuart for restaurants that need delivery without managing their own drivers.
For a quality-led Cambridge independent — a respected restaurant on King Street, a premium bakery, or a growing café group with multiple sites — Slerp provides an ordering experience that customers engage with confidently and that enhances rather than undersells the brand.
The trade-off is scope. Slerp is focused on branded ordering and delivery rather than being a full operating platform with in-store POS and kitchen management. If you also need an integrated POS, kiosks, and deep operational connectivity in the same system, you will need to weigh it against a more complete platform. Pricing is quote-based, so a demo is required to get a site-specific cost.
Pricing: Single monthly fee, quote-based by site count and feature set. Commission-free on orders, with competitive courier pricing. No public rate card.
- Fully white-label ordering that carries your brand throughout the customer journey
- Commission-free monthly fee model — no per-order cut
- Apple Pay, Google Pay, and high-conversion checkout
- Click-and-collect, catering, pre-orders, and courier dispatch available
- Built-in CRM and loyalty with full customer data ownership
- Focused on ordering and delivery, not a full POS or in-store operating platform
- No public pricing — a demo is needed for a site-specific quote
- Less suited to operators who want payments and kitchen management in the same system
Best for: Quality-led Cambridge independents, bakeries, premium cafés, and restaurant groups that want a polished, high-converting white-label ordering experience and full control of the customer relationship.
View full profile →/verdict
How Cambridge restaurants should choose an online ordering platform
The right ordering platform for a Cambridge restaurant is the one that fits how your business actually operates — not just the one with the most features or the most aggressive sales pitch.
Start with what the platform connects to. A direct ordering button is useful. A direct ordering button that feeds into your POS, kitchen display, loyalty programme, and customer database without any manual intervention is a different commercial asset entirely. Flipdish is the only platform in this guide that connects all of those together in one purpose-built system. If you want that operational integration, it is the clear choice for Cambridge operators. If you only need a reliable ordering page or a standalone branded app, the specialist platforms — GloriaFood, Hungrrr, and Slerp — do that job well, often at a lower headline cost.
Understand how the cost model actually works. GloriaFood starts free. Hungrrr charges a flat monthly fee with 0% commission. Square uses transaction fees on a free base plan. OrderYOYO takes a percentage of weekly revenue. Flipdish and Slerp charge a monthly subscription. On a commission model, you keep paying a percentage on customers who are already yours — as direct order volume grows, a flat-fee platform almost always works out cheaper. Model your expected monthly direct order volume against each cost structure before committing, and always add card processing, hardware, and paid feature add-ons to get the true all-in monthly cost.
Make sure it earns repeat orders, not just first orders. An ordering platform that only captures a transaction is a more expensive website. Loyalty schemes, push notifications, and targeted voucher campaigns are how you build a customer base that orders from you directly on the second, fifth, and twentieth visit instead of rediscovering you through a marketplace every time. Platforms with built-in marketing — Flipdish, Hungrrr, and Slerp — will drive meaningfully more repeat revenue than a bare ordering page. This matters especially in Cambridge, where a large student population creates a high-frequency, price-sensitive customer segment that rewards loyalty and convenience.
Think about Cambridge's specific context. Mill Road independents competing against a highly engaged local food community need a platform that looks credible and converts well on mobile — the vast majority of their orders will come from a smartphone. Student-heavy residential areas like Petersfield and Abbey need platforms that handle volume on Friday and Saturday evenings without errors. Tourist-facing city-centre operators need a clean experience that works for one-time visitors as well as regulars. Any Cambridge restaurant currently paying 25–35% to Just Eat, Deliveroo, or Uber Eats on orders from customers who already know their name has the most to gain from switching a meaningful proportion of that volume to a direct channel.
How we ranked these platforms
We assessed each platform across five criteria relevant to a Cambridge restaurant operator making this decision:
- Direct ordering capability (30%): how well the platform supports commission-free direct orders across web, app, Google, and QR.
- Connection to in-house operations (25%): how well direct orders connect to POS, kitchen, and reporting.
- Customer ownership and marketing (20%): loyalty, push notifications, vouchers, and data ownership.
- Pricing and total cost (15%): monthly fees, commission rates, add-ons, and overall value at realistic Cambridge order volumes.
- Ease of setup and fit for Cambridge operators (10%): how quickly you can go live and how well the platform suits the range of independent operators in this market.
Flipdish leads because it scores strongly across all five, and is the only platform in the guide that operates as a full restaurant system rather than a standalone ordering tool. Slerp ranks second on the strength of its premium ordering experience and commission-free model. The remaining platforms each address a clearly defined operator need at a different cost and complexity point.
/frequently asked questions
What is the best online ordering platform for Cambridge restaurants?
Flipdish is our top pick for Cambridge restaurants in 2026. It provides a branded website and app for commission-free direct orders, connected to a POS, kitchen display, loyalty, and marketing tools in one platform. For restaurants that want a free entry point to test direct ordering, GloriaFood is the lowest-risk starting point. For a 0% commission branded app with no long contract, Hungrrr is the strongest-value dedicated option.
Do Cambridge restaurants need their own online ordering platform?
Yes, if you are currently paying commission to Just Eat, Deliveroo, or Uber Eats. Those marketplaces typically charge 25–35% per order, which is extremely difficult to absorb once food, labour, and rent costs are accounted for. A direct ordering platform lets customers order from you commission-free through your own website, branded app, or Google profile, with the customer data and relationship staying with you rather than with the marketplace.
How much does online ordering software cost for a Cambridge restaurant?
Costs range from free (GloriaFood's core plan, Square's base plan) to a flat monthly subscription (Flipdish from €69/month per site billed annually, Hungrrr quote-based) to a percentage of weekly revenue (OrderYOYO). Premium white-label platforms like Slerp are quote-based monthly fees. Always add card processing fees, hardware costs, and any paid add-ons to get the true all-in monthly cost. Flat-fee platforms typically become the better-value option as direct order volume grows.
Can Cambridge restaurants use Flipdish alongside Just Eat and Deliveroo?
Yes. Flipdish aggregates marketplace orders from Just Eat, Deliveroo, and Uber Eats alongside your direct orders in a single view, so you can manage service without multiple tablets and see clearly how much of your volume is direct versus marketplace. The practical goal over time is to grow the direct share and reduce the commission costs attached to it, while maintaining marketplace presence for customer acquisition.
Is GloriaFood genuinely free for Cambridge restaurants?
The core GloriaFood system is free with unlimited orders and no commission, covering delivery, takeaway, dine-in, reservations, pre-orders, and QR ordering. Card payment acceptance and a branded mobile app are paid add-ons. It is an excellent starting point for a Cambridge independent testing direct ordering before committing to a higher-cost platform, but most operators will need the paid add-ons to run it as a serious ordering channel.
Which online ordering platform works best for Cambridge takeaways?
For Cambridge takeaways, Flipdish offers the strongest connected ordering system with marketplace aggregation and delivery management. OrderYOYO provides a done-for-you branded app and managed Google Ads on a revenue-commission model. Hungrrr offers a 0% commission branded app on a flat monthly fee with no long contract. The best choice depends on whether you prefer a managed service or a fixed monthly fee with full control of your own setup.
How do direct ordering platforms compare to Just Eat for Cambridge restaurants?
Just Eat and the other delivery marketplaces charge 25–35% commission per order and own the customer data and the relationship. Direct ordering platforms like Flipdish, GloriaFood, and Hungrrr let you receive orders commission-free through your own website, app, or Google profile, keeping the customer data, the relationship, and the margin. Most Cambridge restaurants with an established customer base benefit from running both in parallel and growing the direct share over time rather than abandoning marketplaces entirely.
What features should a Cambridge café look for in an online ordering platform?
Cambridge cafés typically benefit most from click-and-collect, QR ordering for table use, clean mobile-first menu browsing, simple menu management, and integrated card payments. Square is the lowest-friction option for cafés already using Square for payments. GloriaFood provides a free setup covering ordering, reservations, and a QR widget. Flipdish is the strongest choice for cafés that want to add loyalty, push-notification marketing, and a branded app on top of reliable ordering.