Shopify App Development Agency
Custom Shopify apps built on Gadget.dev by ex-Shopify engineers
We’re a Shopify app development agency that designs, builds, and launches high-reliability custom apps for brands that need more than a theme tweak. From operational automation to revenue-driving features, we ship apps that pass Shopify review and scale in production.
We build on Gadget.dev, the purpose-built platform for Shopify app development created by ex-Shopify engineers. That means faster builds, managed infrastructure, and production-grade reliability from day one. We’re one of the few Shopify agencies with deep Gadget.dev expertise, and our own apps (JourneyGlow, PriceGlow, StockGlow) ship on it every week.
Custom Apps We Build
Most projects fall into one of two buckets, and we handle both:
- Private apps for a single store, solving an internal workflow that no theme edit or off-the-shelf app can cover. Think custom fulfillment logic, ERP and 3PL connectors, or merchandising tools tied to your own data.
- Public apps built to pass Shopify App Store review and earn recurring revenue, with billing, embedded Polaris UI, and the observability needed to support real customers.
Our Shopify App Development Services
A custom app is rarely just code. Our Shopify app development services cover the full lifecycle, from the first scoping call to ongoing support after launch:
- Discovery and scoping. We map the workflow, data model, and Shopify review requirements before quoting, so you know exactly what you’re buying.
- App architecture and build. Embedded Polaris UI, App Bridge, OAuth, and billing, wired to the API surface your app depends on (Admin, Storefront, GraphQL, and webhooks).
- App Store submission. For public apps, we prepare the listing and run the review process so submissions don’t stall on avoidable rejections.
- Integrations. ERP, 3PL, CRM, and payment connectors built with retries and observability, not brittle one-off scripts that fail silently.
- Maintenance and support. Monitoring, Shopify API version upgrades, and new features under a retainer once the app is live.
Whether you need a single private app or a public product with a full App Store presence, we scope the work to the outcome rather than forcing it into a fixed package.
Why Brands Choose Us as Their Shopify App Development Company
Picking a Shopify app development company comes down to one question: have they actually shipped apps that survive production and pass review? We have. We run three of our own apps on the Shopify App Store and build private apps for merchants who need functionality a theme cannot reach.
What that means for your project:
- Real App Store experience. We know what Shopify review looks for, so submissions don’t stall on avoidable rejections.
- Production reliability. We build in retries and observability up front, not after the first outage.
- Honest scoping. If an off-the-shelf app already solves your problem, we’ll say so. We build custom when custom is the right call.
Whether you need a private app for an internal workflow or a public app to publish and monetize, we scope the work to the outcome.
Recent Work: Swiss Water
When Swiss Water, the global leader in chemical-free decaf, needed their multi-roaster marketplace automated, off-the-shelf apps couldn’t touch the problem. We built a custom Shopify application that routes every order to the right independent roaster, fetches live carrier rates per roaster origin at checkout, and dispatches shipping labels automatically. Manual order routing was eliminated, and their team reclaimed hundreds of hours per quarter.
Read the full Swiss Water case study or see the project overview. For public-app proof, we took CrowdShop, a dynamic-pricing and cashback app, from first conversation to a live App Store listing for a client in three months, and our own JourneyGlow, PriceGlow, and StockGlow are live on the Shopify App Store right now.
Related Services
Looking for a full store build alongside your app? See our Shopify web design agency service. Need to drive installs for your public app? We run Shopify App Store Ads too. If your storefront needs a custom frontend rather than an embedded app, see our headless Shopify service. Connecting Shopify to an ERP or 3PL system rather than building a standalone app? That’s our Shopify integration services work. If the app is one piece of a bigger technical roadmap, a fractional ecommerce CTO can own the architecture and vendor decisions, and an ecommerce consultant can place the build inside a wider growth plan. Once the app ships, our Shopify SEO work makes sure the store it lives on actually gets found. Browse our portfolio for more examples. And if you’re wondering whether you’ve outgrown Shopify entirely, our guide on replacing Shopify with a custom build walks through that decision honestly.
Serving Shopify brands across Ontario
We build apps for brands in Toronto and the GTA, Mississauga, Vaughan, Hamilton, Kitchener-Waterloo, Waterloo, Guelph, and across Ontario. App development happens remotely regardless of location, with kickoff meetings available in southwestern Ontario and the GTA.
Custom private apps for unique workflows
Partner-friendly public apps that pass review
Deep API integrations (Admin, Storefront, GraphQL, Webhooks)
Embedded UI, Polaris, App Bridge, OAuth, billing
Selected apps
Examples of in‑house and client apps we’ve built.
How we build
A proven path from idea to review‑approved launch.
We map requirements, success metrics, and technical constraints.
UX flows, data models, security model, review readiness.
App scaffold, integrations, automated tests, CI/CD.
App Store submission or private deploy, observability, docs.
FAQs
How long does a custom app take?
MVPs are typically 3–6 weeks; complex builds 8–12+ weeks.
Do you support and maintain apps?
Yes. We offer maintenance retainers with monitoring and regular updates.
Can you integrate my ERP/3PL/CRM?
Yes. We implement secure integrations with retries and observability.
How much does custom Shopify app development cost?
It depends on scope. A focused private app or MVP usually starts in the low five figures, while a public App Store product with billing and a review-ready UI costs more. We scope each build before quoting and won't pad it with features you don't need.
What should I look for in a Shopify app development company?
Ask whether they've actually shipped apps that passed Shopify review and run in production, not just theme customizations. Ask how they handle webhooks, retries, and observability. We run three of our own apps on the App Store, so those answers come from experience rather than theory.
Can you take over or fix an existing Shopify app?
Yes. We pick up apps that were built elsewhere and need stabilizing, new features, or a path back through review. We start with a short audit so you know the state of the code before committing to the work.
What's included in your Shopify app development services?
The full lifecycle: discovery and scoping, app architecture and build, API integrations, App Store submission for public apps, and maintenance once the app is live. We scope each engagement to what your project actually needs rather than selling a fixed package.
