How to Build an App Like Toast (Restaurant POS)

Toast charges $69 per month for a single POS terminal. Add online ordering, employee scheduling, payroll, and marketing tools. A five-location restaurant group ends up paying $2,000 to $8,000 per month. That is $24,000 to $96,000 per year, for software that was not designed for your specific workflows, your franchise rules, or your brand.

At some point, the math changes. This article tells you what it costs to build a Toast-equivalent system, what the hardest parts are, and exactly who should consider doing it.

What a Toast-like system actually means to build

Toast is not one product. It is four separate surfaces that talk to each other in real time.

The POS is the core: the tablet interface where servers take orders, apply modifiers, split checks, and close tickets. It runs in the dining room, at the bar, and at the counter. Every other surface feeds off data generated here.

The Kitchen Display System (KDS) sits behind the pass. When an order fires from the POS, the KDS receives it and routes each item to the right station: grill, fryer, cold prep, expo. The cook marks items done. When every item on a ticket is complete, the expo screen shows the consolidated ticket, ready to plate and run.

Online ordering is the customer-facing side. It is a menu page or embeddable widget that accepts orders from the web and pushes them directly into the POS queue. No manual entry, no phone calls.

Back-of-house tools cover everything the customer never sees: employee schedules, labor cost forecasting, payroll export, and inventory tracking.

Each surface is a separate engineering project with its own complexity. Most custom restaurant OS projects tackle the POS and online ordering first, then layer in the KDS and back-of-house in a second phase.

Core features to build (MVP vs. full)

MVP: POS and online ordering

The minimum viable build is a working POS paired with an online ordering widget. These two surfaces cover most of a restaurant's daily volume and give you the real-time data loop that makes everything else possible.

Menu management is the foundation. You need categories and items, modifier groups (add bacon +$2, gluten-free crust, sauce on the side), availability rules (the lunch menu goes live at 11am and ends at 3pm), and 86ing. That is the ability to mark an item out of stock in seconds and have that change reflect everywhere, including the online ordering page.

Order flow covers four order types: dine-in (table assignment, seat-level ordering), bar tab (open-ticket model, running total), takeout (order created, customer notified when ready), and delivery (order sent to third-party driver or in-house fleet). Each type has a different ticket lifecycle and different data requirements.

Payment processing includes split check by item or by amount, discount codes, cash handling, credit card via Stripe, and contactless (tap to pay). Receipts go via email or thermal printer.

End-of-day close generates the Z-report: total sales, cash drawer count, tip pool calculation, and payment method breakdown. This feeds into payroll and accounting exports.

Table management gives front-of-house staff a floor plan view. Each table shows status (available, occupied, needs cleaning) and the assigned server. Drag-and-drop seat reassignment is standard.

Online ordering is a menu rendered as a public URL or embeddable widget. The customer selects items, adds modifiers, checks out with a credit card, and gets an SMS confirmation. The order appears in the POS queue automatically, treated identically to a phone-in or walk-up order.

Full build: KDS and back-of-house

The KDS adds real-time order routing by station. Each item is tagged to a prep station when the menu is configured. When a ticket fires, the KDS routes burger items to the grill screen, fries to the fryer screen, and salads to the cold station, all simultaneously, not sequentially.

Back-of-house adds employee scheduling (drag-and-drop shift builder, coverage warnings when a shift is understaffed), labor cost forecasting (projected labor percentage against projected revenue), and inventory tracking (par levels, usage logging, low-stock alerts).

The tech stack

The POS runs as a React web app in a tablet browser. This makes updates instant. Deploy a new version and every terminal picks it up on the next page load, with no app store submission required. React Native is an option for a native app (better offline support, access to device hardware like the receipt printer via Bluetooth), but it adds 3–4 weeks to the build.

Real-time order routing between the POS and the KDS runs over WebSockets. When a server fires a ticket on the POS, the order data pushes to every KDS terminal in under 200 milliseconds. This is not something you can poll. It needs a persistent connection.

PostgreSQL handles the persistent data layer: orders, menu items, employees, payments, and the shift ledger. Redis handles real-time state across all terminals, so the expo screen always reflects what the grill and fryer screens have marked done.

Stripe processes card payments. Twilio sends the order-ready SMS to takeout customers. SendGrid handles email receipts.

The full stack:

How long it takes and what it costs

A full four-surface restaurant OS runs $100,000–$170,000 over 16–20 weeks. The POS is the largest component at 8–12 weeks on its own. Here is how the budget typically breaks down:

These ranges assume a team of two to three engineers, a product designer, and a project manager. Offshore teams reduce cost by 30–40% with a longer communication overhead. If you only need the POS and online ordering (the most common Phase 1 scope), budget $75,000–$115,000 over 11–16 weeks.

The hardest technical challenge

Offline mode is the problem most teams underestimate until it bites them.

Toast advertises that its POS keeps working when the internet goes down. That sounds like a minor reliability feature. It is not. Building it changes the architecture of the entire POS.

A standard web app assumes a live API connection. Every action, firing an order, processing a payment, marking a table, hits the server and gets a response. When the connection drops, the app breaks.

An offline-capable POS needs a local-first database: IndexedDB in the browser, or SQLite in a native app. Every action writes to the local store first, then syncs to the server when connectivity returns. The app works normally during an outage. The kitchen still receives orders. Payments still process, because card networks offer offline authorization modes for Stripe integrations.

The hard part is conflict resolution. Two servers are both modifying the same table, one adds an item, one splits the check, while the terminal is offline. When both terminals come back online, the sync layer has to reconcile those changes without losing data or creating a corrupted order state. That logic is genuinely complex and requires deliberate architectural design from day one.

Skip offline mode and your POS fails every time the router reboots or the ISP has a 10-minute outage. In a restaurant, a 10-minute outage at 7pm on a Saturday is a very bad night.

The KDS has a different hard problem: multi-station ticket consolidation. An order with a burger, fries, and a salad fires three items to three different stations. The expo screen needs to know when all three are done and show the consolidated ticket, ready to plate and run, without showing it prematurely when only the burger is done. This requires a ticket state machine that tracks item-level completion per station and merges them at the ticket level. Getting the state transitions right across concurrent station updates is the core challenge.

Build vs. Toast: when custom wins

Toast wins for: any single-location restaurant, any operator with fewer than five locations, any business that does not want to manage software infrastructure. Toast's starter hardware costs $627. The software starts at $0 per month for basic POS. For a single restaurant, the custom build cost of $100,000+ will never pay back.

Custom wins for:

Multi-location restaurant groups with 5+ locations. Toast plus online ordering, scheduling, payroll, and marketing tools runs $400–$1,000 per location per month. At five locations, that is $2,000–$5,000 per month, or $24,000–$60,000 per year. A custom system at $120,000 pays back in 2–5 years. After that, you own the asset.

Ghost kitchen operators. A ghost kitchen runs five to fifteen brands out of one facility. Each brand needs its own menu, its own online ordering page, and its own order routing rules. Toast was not built for this. A custom KDS that routes orders by brand, not by table, fits the ghost kitchen model far better.

Franchise systems. A franchise with 50+ locations wants its own branded POS, its own analytics dashboard, and the ability to push menu updates to all locations simultaneously. White-labeling Toast is expensive and limited. A custom system is the franchise's technology asset.

Restaurant tech startups. If you are building a vertical SaaS for independent restaurants, a custom POS is the product, not the tooling. Toast is your competitor, not your vendor.

How RaftLabs can help

RaftLabs has built multi-surface software systems for hospitality and retail operators. We know the patterns: real-time WebSocket architectures, offline-first local databases, multi-tenant menu management, and Stripe payment integrations that handle the edge cases restaurant operators run into every shift.

Our typical engagement for a Phase 1 restaurant OS (POS + online ordering) runs $75,000–$115,000 over 11–16 weeks. We start with a two-week discovery sprint that maps your order flow, your menu structure, and your integration requirements, before writing a line of code. The discovery sprint de-risks the project and produces a fixed-scope proposal.

If you are running five or more locations and paying $50,000+ per year across Toast, online ordering, and scheduling tools, the custom build conversation is worth having.