Custom apps built on the Admin, Storefront and Functions APIs: subscription logic, wholesale tools, internal dashboards. Your code, your repository, no per order fees to anyone, ever.
140 stores built, 8 years on the platform, senior engineers only
Codioo builds custom Shopify apps: subscription engines, wholesale and B2B tools, fulfilment logic and internal dashboards, built on the official Admin, Storefront and Functions APIs. Apps start at $4,500 with fixed scope, ship in six to ten weeks, and transfer to your repositories at launch. You stop paying per order app fees and start owning logic nobody can switch off.
Custom apps usually replace three subscription fees with one owned build. These are the recurring shapes.
Box logic, swap and skip rules, pause and dunning flows, exactly your rules, with the customer portal on your domain.
Price lists per customer group, quote flows, order minimums, net terms tracking and quick reorder for account buyers.
Rules that decide how an order ships, kit and bundle assembly, split shipment decisions, and the exceptions screen your warehouse team needs.
One screen inside the Shopify admin for the job your staff actually do: pick lists, approvals, content staging, fraud triage.
Wishlists, configurators, loyalty interactions and gift flows implemented as apps so they survive theme changes.
We audit your app bill, list what a custom build could replace, and model the break even month against your real volume.
The trigger is almost always arithmetic: subscription fees against build cost, or a need no app serves.
Per order or per revenue pricing that grows monthly while the feature stays the same size.
Your subscription, bundle or pricing rules have conditions every app vendor calls an edge case.
Work leaves the admin for CSV round trips that break and age badly.
Two apps fight over the same order data and support teams blame each other.
Logic that needs its own tables, cron jobs and API endpoints, not a settings panel in someone else's cloud.
A shutdown notice gives you ninety days to replace logic your business leans on.
Timing has an outsized effect on app projects. Building against a stable business process produces a clean app; building against a process still being invented produces a change log with no releases. We scope apps in two stages for exactly this reason: a production slice that captures the rules as they stand, then a hardening pass once the process settles. Teams that skip the staging almost always pay for it twice, once in rework and once in the support tickets the rework generates.
App architecture starts with billing permissions, oddly enough. The less an app can touch, the safer you are and the faster Shopify approves changes. We scope down relentlessly: read only where writing is unnecessary, webhook scoped instead of polling, admin UI pages instead of storefront script injection. A custom app inside your own store avoids the app store review path entirely, which is why internal tooling rarely needs to be public.
Money paths get engineering discipline. Webhooks arrive with HMAC signatures, land in a queue, and process with retries and a dead letter alert, because Shopify will redeliver but your customer will not wait. Idempotency keys guard every write that can be retried. The subscription engine treats billing edge cases, card failures, plan changes mid cycle, timezone boundaries in billing dates, as first class behaviour with tests, not as support tickets waiting to happen.
Admin UIs follow Polaris, Shopify's own design system, deliberately. Your staff already live in the Shopify admin every day; an internal tool that looks and behaves like it takes zero training. We build with App Bridge so the app sits embedded in admin navigation, respects staff permissions, and inherits your session handling. The measure of a good internal tool is that nobody schedules a meeting to explain it.
Ownership is the point of custom apps, so handover is engineered in. The app runs in infrastructure you control, commonly Cloudflare Workers or a small Node service, with secrets in your vault and billing in your accounts. Documentation covers the data model and the failure modes. At launch your developers get a recorded walkthrough and the runbook. If we disappear the next day, the app keeps running and any competent Shopify team can pick it up.
Discovery leans hard on arithmetic here: what the app replaces, and when it pays for itself.
Step 1
Week 1
Current app bill, rules inventory, conflict map. You get the build versus buy model with break even month.
Step 2
Weeks 1 to 2
Data model, API scopes, webhook plan and the edge case list for your rules, signed before code.
Step 3
Weeks 2 to 5
The rules engine and its tests on real shaped data, staged behind feature flags.
Step 4
Weeks 4 to 7
Customer portal if storefront facing, Polaris admin UI if internal, both responsive and accessible.
Step 5
Weeks 7 to 9
Load testing against peak order volume, monitored rollout, rollback rehearsed, runbook written.
Step 6
Week 9 or 10
Repository transfer, developer walkthrough, documentation, then care plan or your team.
Boring, hireable technology inside Shopify's supported surfaces.
Numbers with baselines and measurement windows. The full library is on the case studies page.
Aura Rituals
Aura Rituals ran subscriptions through an off the shelf app that could not express their bundle and swap rules. Subscribers hit dead ends changing pro...
-19%
Subscription churn
Hearthside Living
Hearthside Living sells across two storefronts and a marketplace while stock truth lives in NetSuite. The nightly sync ran every six hours, so peak se...
<2 min
Order sync latency
Loom & Lane
Loom & Lane sells premium essentials to a loyal list, but the store ran on an aging custom platform that fought every campaign. Collection pages took ...
+31%
Conversion rate
Pricing and timelines
Compared monthly against the app fees you stop paying, in writing, in the audit.
| Project type | Price from | Timeline | What is included |
|---|---|---|---|
| Scoped internal app | $4,500 | 6 to 8 weeks | Core logic, admin UI, tests, handover |
| Subscription engine | $8,000 | 8 to 10 weeks | Rules, portal, dunning, billing edge cases |
| Wholesale or B2B app | $7,000 | 8 weeks | Price lists, quoting, minimums, reordering |
| Migration off an app | $4,000 | 4 to 6 weeks | Data export from the old app, parity build, cutover |
| App care plan | $600/mo | Ongoing | Monitoring, API update tracking, fixes, small features |
What changes the price
Updated 2026-09-21. Prices in USD, fixed per signed scope. See the full cost guide for every driver.
The integration just works. Orders land in NetSuite in minutes, stock comes back accurate, and our peak season ran without a single oversell.
They are the rare agency that argues with you when you are wrong. The subscription app they built cut our churn and our support load at once.
Preset answers about scope, price ranges and timelines. The audit turns them into numbers for your store.
Ask about your project
Instant answers, no chat window
Still unsure? The free store audit answers these for your store specifically, with numbers.
The questions clients ask before signing, answered plainly.
Tell us your store and goals. Within one business day you get the audit findings and a fixed price for shopify app development, with a named team and a launch date.