Fewer workarounds
A purpose-built app replaces spreadsheets, manual handoffs and several half-fitting tools.
Shopify App Development
When off-the-shelf apps stop being enough.
Three purchased apps often cost more than one of your own - and still only half-solve the problem. We build the app that fits your process.
Start a Project
Full control
Data, permissions and roadmap stay aligned with your actual use case.
Cleanly integrated
Admin, storefront, checkout and external systems work together through stable Shopify interfaces.
- Since 2019
- 150+ Migrations and Relaunches
- Official Shopify Plus Partner
What do we build as a Shopify app?
Custom apps for your store
Apps installed in your store only: admin interfaces for your team, automations, data processing and connections to third-party systems. No App Store review, no external roadmap, full control over data and permissions.
App extensions and checkout
Extensions that hook into the places Shopify provides: admin blocks, theme app extensions in the storefront and - on Shopify Plus - checkout extensibility instead of edits to checkout.liquid.
Public apps and distribution
If your solution is meant to become a product: multi-tenancy, Billing API, privacy webhooks, App Store listing and Shopify's review process - including the question of whether it pays off.
Custom app, public app or theme extension?
Theme is enough: it is pure presentation
A new section, a badge, a filter over data you already have. Building an app for that creates operational overhead with no return.
Theme is enough: no third-party systems
As long as all data already sits in the store and no credentials need protecting, you need neither a server of your own nor an app.
Theme is enough: logic may run in the browser
Displays, calculations and configurators that nobody can manipulate to their own advantage are fine in the front end.
Public app: you want to sell a product
Only worthwhile if many merchants share the problem and you are ready to carry support, billing and continued development permanently.
App required: there is an admin interface
As soon as your team has to maintain, approve or review something, it needs a surface inside the Shopify admin - embedded via App Bridge.
App required: secrets or third-party systems
API keys, ERP credentials or pricing logic nobody may see belong on a server, not in theme code.
App required: the checkout is involved
Discount, shipping and payment logic runs through Shopify Functions and checkout UI extensions. Both require an app.
App required: something runs without a user
Scheduled jobs, webhook processing and bulk operations need a running process. Theme code only executes on page requests.
How does a Shopify app come together?
01
Sharpen the requirement
We clarify which process actually breaks, who uses the app and what happens when it fails. Scope frequently shrinks considerably at this step.
02
Build or buy
We check honestly whether an existing app is enough. An off-the-shelf app that covers 80 percent often beats a custom one - as long as the missing 20 percent is not the core of your business.
03
Define permissions
Access scopes are limited to what is needed; webhooks and data storage are documented. Widening scopes later requires renewed approval and is correspondingly unpleasant.
04
Build it
Admin API over GraphQL, interface via App Bridge, extensions as app extensions. Development runs against a development store with realistic data.
05
Test and roll out
Rate limits, failure cases and retries are tested actively, not just the happy path. Rollout is controlled; for public apps it runs through Shopify's review process.
06
Operate it
Shopify releases new API versions regularly and retires old ones. We keep the app on a supported version, monitor errors and schedule changes before anything expires.
When is one custom app cheaper than three bought ones?
Recurring app fees
Several subscriptions add up monthly and often scale with revenue or order volume. A custom app costs more once and maintenance afterwards. Whether the switch pays off shows in your own store's actual app spend and in how it grows with volume.
Performance cost
Every installed app brings scripts, assets and data fields with it. Three apps for one job load the storefront three times over; one bundled solution only once.
Process friction
When three apps interpret the same data differently, your team pays for it in daily coordination. One app built around your process model removes that.
Dependency
Price changes, acquisitions or discontinued apps hit you without warning. With a custom app the code is yours - along with the duty to maintain it.
Is this the moment for an app of your own?
Then it is worth building
The process already runs
The workflow the app is meant to take over already exists - today in spreadsheets, by word of mouth or by hand in the admin.
The standard is exhausted
You have worked with an off-the-shelf app and can name exactly where it fails to represent your process.
Operations are settled
It is clear who watches for failures after launch, owns the hosting and keeps up with new Shopify API versions.
The data holds up
Product records, metafields and inventory are maintained. An app automates a process; it does not repair data quality.
Then something else is the next step
Make-or-buy is still open
If it is still being debated internally whether to build at all, that decision will cost more than any prototype.
Shopify strategy & consultingOnly data needs to move
If the point is purely moving products, inventory or orders between store and ERP, the flow is the subject, not an interface.
System integrationIt only concerns the checkout
Many shipping, payment and discount adjustments can be solved with existing configuration before custom logic becomes necessary.
Shopify checkoutWorking together
How do you get to an app of your own?
Not every project starts with development - sometimes the solid answer is that no custom app is needed at all.
Feasibility review
Who it is for
For projects where it is unclear whether a theme extension, an existing app or custom development is the right route.
What is included
- Sharpen the requirement and affected processes
- Build-or-buy comparison against existing apps
- Outline access scopes and data processing
How it ends
Ends with a reasoned recommendation including scope - even when it argues against building your own app.
First build stage
Who it is for
For a clearly described process that should exist as a working custom app inside your store.
What is included
- Admin surface via App Bridge
- Admin API integration over GraphQL
- Test rate limits, failure cases and retries
How it ends
Ends with an installed app your team can operate day to day without us.
Operations and API upkeep
Who it is for
For apps in production that have to keep pace with Shopify's regular new API versions.
What is included
- Keep the app on a supported API version
- Monitor errors and webhook delivery
- Implement extensions as needed
How it ends
Ends with an app that does not fail unannounced because an API version was deprecated.
E-commerce for brands with bigger ambitions.
Brands with €950M+ GMV trust us
From migration to scale, NICCOS combines bold design, robust technology and data-driven growth on Shopify.
Common questions about Shopify app development
What is the difference between a custom app and a public app?
A custom app is installed in your store only, goes through no App Store review and may be tailored exactly to your process. A public app is a product for many merchants: multi-tenant, with billing, support and review. For internal requirements the custom app is almost always the right route.
When is a theme extension enough?
Whenever the task is presentation and all data already sits in the store. Visible building blocks, layouts and filters belong in the theme. As soon as server logic, protected credentials, an admin interface or checkout rules are involved, there is no way around an app.
What is checkout extensibility?
It is the route Shopify provides for extending the checkout after checkout.liquid was retired. Customisation runs through checkout UI extensions and Shopify Functions, meaning through an app rather than theme code. The more far-reaching options are available on Shopify Plus.
How long does building a custom app take?
Almost entirely down to the scope of the integrations, not the interface. An app that automates a clearly described process is finished far sooner than one that has to settle a data model on the side. A reliable timeline therefore only emerges after the interfaces have been scoped.
Who operates the app after launch?
Either your team or ours. Hosting, monitoring, error handling and dealing with new Shopify API versions all need an owner. Without one, every app ages quietly and eventually fails without notice.
Does an app always need its own server?
For anything that holds credentials, processes webhooks or runs on a schedule, yes. Pure interface extensions can sometimes do without. The question comes down to whether logic must be protected and executed outside a page request.
Do you build themes as well?
Yes, but that is a separate discipline. Storefront, templates, sections and front-end performance are covered on our Shopify development page. This page covers everything that runs in the admin, in the checkout or on a server of its own.
Do you really need your own app?
We look at your process and tell you whether a theme extension is enough, an existing app will do, or a custom app is the cheaper answer.
Last updated:
