A single-purpose private app that syncs one data feed into Shopify costs between $2,500 and $8,000 to build properly in 2026. A mid-complexity app with a merchant-facing admin UI, background jobs and two or three integrations lands at $12,000 to $40,000. A public app you intend to list, monetise and support on the Shopify App Store starts around $60,000 and can pass $150,000 before you've spent a rupee or a dollar on marketing. Those are the numbers we quote, and they hold up whether the client is in Austin, Manchester or Melbourne.
The spread is wide because "Shopify app" describes everything from a 300-line webhook handler to a full SaaS product with its own billing, onboarding and support desk. What follows is how the Shopify app development cost actually breaks down, and where founders routinely overspend.
What you're really paying for
Very little of the budget goes to the feature you described in the first meeting. Most of it goes to everything around that feature.
Authentication and session handling. OAuth, session tokens, App Bridge for embedded admin pages, and the mandatory compliance webhooks Shopify requires before review. Rate-limit handling on the Shopify API, because the GraphQL Admin API works on a leaky bucket and a bulk operation on a 40,000-SKU catalogue will hit the ceiling on your first real merchant. Retry logic and idempotency, so a failed webhook doesn't double-charge or duplicate an order. Logging you can actually search when a merchant emails at 11pm during Black Friday.
That plumbing is roughly 40% of a first build. It's also the part that gets skipped by the cheapest quote you'll receive, and the reason those apps break the first time Shopify ships a quarterly API version.
The seven things that move the price
- Complexity of the data model. Reading orders is cheap. Writing to inventory across multiple locations, or reconciling a third-party system's stock with Shopify's, is not. Bidirectional sync roughly doubles the estimate of one-way sync.
- Custom features versus Shopify primitives. If your requirement maps to metafields, metaobjects, Shopify Flow or a theme app extension, you're in the low thousands. If it needs Shopify Functions written in Rust or JavaScript compiled to WASM (custom discounts, bundles, delivery or payment customisations post-checkout-extensibility), add $4,000 to $15,000 for that module alone.
- Integrations. Budget $2,000 to $6,000 per integration for a well-documented REST API with sandbox access. Double it for anything that talks SOAP, sends CSVs over SFTP, or belongs to an ERP whose documentation is a PDF from 2014. NetSuite, SAP B1 and Dynamics all fall in the second bucket.
- AI functionality. Semantic search, product description generation, support triage. The build is often modest, $6,000 to $20,000, but the running cost is the part people miss. Embedding and re-embedding a 20,000-product catalogue, plus per-query inference, plus a vector store, can be $150 to $900 a month before you serve a single extra order. Price that in or the app dies of unit economics.
- Design. An admin interface built on Shopify Polaris is faster and cheaper than a bespoke design system, and merchants trust it more because it looks like the rest of their admin. Custom Figma work for a public app adds $3,000 to $10,000. For a private tool used by four people in your ops team, skip it.
- Testing. Unit tests, a staging store per environment, and a real load test if you expect festive traffic. Around 15% of build cost. Non-negotiable if the app touches orders or money.
- Maintenance and support. Plan on 15% to 25% of the build cost per year. Shopify ships a new API version every quarter and supports each for twelve months, so an app left alone for a year will break. Add support hours if the app is public: a listing with a few thousand installs generates real inbox volume.
Rates: where your developers sit changes the number by 3x
Senior Shopify app developers in the US bill $120 to $220 an hour. UK agencies sit at £75 to £140. Australia runs A$130 to A$200. An experienced offshore team in India, ours included, is typically $28 to $55 an hour for the same stack and the same Built for Shopify standards.
The honest caveat: the saving is real only when the team has shipped apps through Shopify's review process before. If they haven't, you'll spend the difference on rejections. Shopify's reviewers check performance impact, mandatory webhooks, billing implementation and onboarding flow, and a rejection cycle costs two to four weeks each time. We publish more detail on rates and scoping in our breakdown of Shopify development cost in India, and if you only need a couple of sprints of capacity, it's often cheaper to hire a Shopify developer on a retainer than to commission a full project.
Three realistic cost brackets
Simple: $2,500–$8,000
One job, no UI or a single settings screen. A webhook that pushes paid orders into a warehouse system. A script that tags customers by lifetime value nightly. A theme app extension that renders a delivery-date estimate on the product page. Two to four weeks. Usually built as a custom app installed on one store, which means no App Store review and no billing code.
Medium: $12,000–$40,000
Merchant-facing settings, background queues, two or three integrations, per-store configuration, a proper database. Examples we see constantly: B2B pricing tiers with approval workflows, a made-to-order configurator writing line item properties, a returns portal that talks to a 3PL and issues store credit, or COD verification with an OTP step and a risk score for Indian and Gulf merchants. Six to twelve weeks.
Enterprise or public app: $60,000–$150,000+
Multi-tenant architecture, Shopify's Billing API or managed pricing, usage metering, onboarding, docs, a support system, GDPR data-deletion handling, and infrastructure that survives a merchant importing 200,000 variants on a Tuesday. Three to six months, and the build is the smaller half of the total cost over year one.
When a custom app is worth it, and when it isn't
Most of the time, it isn't. If you can name three apps on the App Store that do 80% of what you want for $29 a month, buy one and live with the missing 20%. A $25,000 build has to displace roughly $700 a month of subscriptions, forever, before it's even neutral, and that ignores the maintenance line.
Custom makes sense in four situations. One: the logic is your competitive edge, like a pricing engine tied to live commodity rates or a proprietary allocation rule. Two: your data lives somewhere no off-the-shelf connector reaches. Three: you're stacking six apps to fake one workflow and each one adds script weight to the storefront. Four: the app store option exists but charges per order, and at your volume the subscription is now $2,400 a month.
That last one is the most common trigger we see from D2C brands crossing into serious volume. Do the arithmetic before you commission anything.
Buy first, build second
We publish our own apps precisely because a lot of requests we receive don't need a custom build. Gold & Silver Live Rate handles live metal-rate pricing for jewellery stores, which is otherwise a genuinely awkward custom project involving rate feeds, making charges and GST. FilterPro covers smart product filters and AI search, the thing most large catalogues actually need instead of a bespoke search build. SwiftStore automates PageSpeed work that founders otherwise pay by the hour for. Each is a fraction of a custom equivalent, and none needs a Shopify API review cycle from you.
If your requirement genuinely has no equivalent on the App Store, that's what our Shopify app development services exist for.
Six ways to cut the bill without cutting corners
- Build a private custom app first. Skip App Store review, billing and multi-tenancy until you know merchants other than you want it. Converting a proven custom app into a public listing later is cheaper than guessing upfront.
- Write the spec as user stories with acceptance criteria, not as a wish list. Vague scope is the single biggest cause of overrun. An hour with a Shopify architect before quoting can knock 20% off the estimate.
- Use Polaris and App Bridge as-is. Merchants don't want your design system.
- Use Shopify's managed pricing rather than a custom billing implementation. It's less code and fewer rejection reasons.
- Check whether Shopify Flow, metaobjects or a Function already does it. Several requests we get for $20,000 builds are three Flow steps.
- Ship in phases with a working milestone every two weeks. Half-finished apps that only get demoed at the end are where money disappears.
The cost line people forget
Hosting and services. A modest Remix or Node app on Fly.io, Railway or a small AWS footprint runs $20 to $120 a month. Add a managed Postgres, a Redis queue, error tracking, and you're at $80 to $300. Public apps with real install counts, plus AI inference, can run $500 to $3,000 a month. Nobody quotes this in the proposal, and it's the number that decides whether an internal tool is cheaper than the subscription it replaced.
FAQ
How long does a Shopify app take to build?
Two to four weeks for a single-purpose custom app. Six to twelve weeks for mid-complexity. Three to six months for a public App Store listing, including review cycles.
Is a private custom app cheaper than a public one?
Considerably. You skip App Store review, billing integration, multi-tenant architecture, onboarding and public documentation. That's often 40% of a public app's cost.
Do I need Shopify Plus to use a custom app?
No. Custom apps work on every Shopify plan. Shopify Functions for checkout, discounts and delivery customisation, and checkout UI extensions, are where Plus starts to matter. If that's the direction you're heading, a Shopify Plus partner should walk you through whether the plan upgrade is justified yet. Usually it isn't until you're pushing serious order volume.
What ongoing costs should I plan for?
Hosting and services, plus 15% to 25% of build cost annually for maintenance. Shopify deprecates API versions on a rolling twelve-month cycle, so "no maintenance" is not an option.
Can an existing app be customised instead?
Sometimes. Some App Store apps expose their own APIs or webhooks, and a small bridge app costs a fraction of a full rebuild. Worth asking the vendor before you commission anything.
Will a custom app slow my storefront down?
Only if it injects scripts into the theme. Admin-only and webhook-driven apps have zero storefront cost. Use theme app extensions rather than script tags for anything customer-facing, and measure LCP before and after.
Who owns the code?
You should. Confirm it in writing, along with repository access and deployment credentials, before the first invoice. We hand over both.
Next step
Before you brief anyone on a build, get someone to look at your store and tell you which of your workflows an existing app already solves. Our free Shopify audit covers exactly that: where the manual work is, which app subscriptions are redundant, and whether a custom build actually pays for itself at your current order volume. If the honest answer is "buy the $29 app", we'll say so.