Custom merchant apps
Build focused tools for a client store when an existing app cannot support the required operational workflow without avoidable compromise.
Shopify app development · UK agencies
Custom Shopify apps, delivered behind your agency.
Trusted to deliver, behind the scenes
Selected digital delivery
Digital experiences shaped around the real brief.
Explore broader website and product-facing work delivered by the team behind this service. App-specific capabilities are confirmed against your technical brief—not inferred from a visual portfolio.
A technical Shopify partner behind your agency
Define the application before committing to the build.
A Shopify app is not another storefront page. It may carry permissions, merchant data, background jobs, webhooks, external systems, hosting and ongoing operational responsibility. Those decisions need to be visible before development begins.
Oncreation turns the business requirement into a testable technical scope, then handles the approved implementation behind your agency. Your team retains the client relationship and commercial ownership while we keep architecture, QA and release responsibilities clear.
White-label Shopify app services
Focused software for a defined merchant workflow.
We first establish whether the requirement needs a custom app, an extension, an integration or a simpler platform-native solution.
Shopify admin workflows
Create embedded experiences and admin extensions around agreed merchant tasks, user roles, permissions and store data.
APIs and system integrations
Connect Shopify with approved external services after data ownership, API limits, authentication, failure handling and operational responsibility are defined.
Storefront and app extensions
Add app functionality at suitable Shopify extension points and coordinate the required theme touchpoints without burying business logic in the storefront theme.
What your agency receives
A Shopify application with clearer technical ownership.
A testable technical scope
Users, workflows, data, permissions, integrations and acceptance criteria are documented before full production begins.
Controlled access to store data
Required permissions and authentication routes are planned around what the application genuinely needs to do.
A release route with ownership
Distribution, hosting, monitoring, credentials, deployment and handover responsibilities are agreed—not left until launch week.
Your agency stays client-facing
We work behind your brand, document decisions for your team and join client conversations only when invited.
From requirement to controlled release
Unknowns surfaced before they become development debt.
Work begins when the decision-makers, store context, system access and information needed for the current discovery stage are available.
- 01Discover
Users, problem, store context, systems and commercial constraints
- 02Specify
Workflows, data, permissions, interfaces and acceptance criteria
- 03Prepare
Development store, access, architecture and release route
- 04Build
App experience, integrations, error states and technical QA
- 05Release
Agency approval, deployment, documentation and support handover
What clients say
Trusted with the work that carries your name.
Clear communication and dependable delivery, from the first brief through launch.
“
What impressed me most was their ability to translate ideas into a clean, intuitive and high-performing website that truly reflects the mission of Shiny’s Academy.
“
Excellent design skills, quick and responsive communication, and an excellent website delivered on time.
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His work ethic, integrity and punctuality are impeccable. He is extremely reliable, accommodating and open to client feedback and iterations.
Ecommerce · separate capacity
Shopify delivery needs its own plan.
Storefront work involves catalogue structure, merchant workflows, apps, migration and launch risk. It is kept separate from the standard Website Partner subscription so the scope stays honest.
Explore Shopify deliveryShopify PartnerThree-month minimum
£1,800/ month
Billed monthly in advance · £5,400 initial contract value
- One active Shopify workstream
- Theme-led stores typically take 2–3 billing cycles
- Custom-designed stores typically take 3–4 billing cycles
- Storefront design, theme work, standard setup, QA and launch
- Pause or cancel with 7 days’ notice after the initial term
Shopify app development FAQs
What your agency needs to know.
Clear answers about suitable app briefs, custom distribution, integrations, permissions, pricing, timing and post-launch ownership.
What kind of Shopify apps can our agency hand over?+
Typical briefs include merchant admin tools, workflow automation, private system integrations, focused app extensions and store-specific functionality that cannot be solved reliably through an existing app. We validate the use case and Shopify extension points before recommending a build.
Is a custom Shopify app included in the Ecommerce Partner plan?+
No. The £1,800 monthly Ecommerce Partner plan covers suitable store and theme delivery. Bespoke apps, business-critical integrations and product-style app development require technical discovery followed by a separate scope, estimate and support agreement.
Can you build an app for the public Shopify App Store?+
Potentially, but a public product is different from a single-store or custom-distribution app. Product strategy, onboarding, billing, multi-merchant architecture, support, compliance and Shopify review must be planned separately before we commit to that route.
Can you extend or repair an existing Shopify app?+
Yes, after a technical review of the repository, ownership, hosting, Shopify configuration, API versions, permissions, dependencies, logs and known issues. We do not promise a fix until the application and access are inspected.
Can the app connect Shopify to another business system?+
Yes, when the external system provides an appropriate API or integration route. We confirm authentication, data mapping, rate limits, error recovery, testing access and which party owns each system before defining the implementation.
How do you handle authentication and Shopify permissions?+
We select the appropriate Shopify authentication and distribution route, request only the access required by the agreed workflows and keep credentials out of client-side code. Exact privacy, retention and compliance obligations remain part of the project scope.
How long does custom Shopify app development take?+
Timing is confirmed after discovery. A focused extension and a multi-system application carry very different design, data, testing and release risks, so we estimate from a written specification rather than promising a generic page-style timeline.
Who owns hosting and support after launch?+
Hosting, monitoring, credentials, maintenance, Shopify API changes and incident response are assigned during scoping. We can provide an agreed support arrangement, transfer the application to your nominated accounts or work within infrastructure your agency controls.
Can you work under our agency brand and NDA?+
Yes. We can sign an NDA, collaborate through your preferred project system and remain behind your agency. Direct client access happens only when your team requests it.
Agency delivery insights
Plan the workflow before committing to application code.
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Free website tools
Make the next website decision with more confidence.
Practical tools for choosing the platform, structuring the website and setting a credible delivery window.
Explore all 8 tools01Choose
Website platform recommender
Compare WordPress, Webflow, Framer, Shopify and Next.js against the project requirements.
Use the tool02Structure
Website sitemap generator
Turn the business, audience, offers and conversion goal into a practical page structure.
Use the tool03Schedule
Website project timeline estimator
Estimate a realistic delivery window from scope, content readiness and project complexity.
Use the toolHave a project?
Let’s talk about what your agency needs to deliver next.
A focused 30-minute conversation about your typical projects, current capacity and whether the partnership fits.
- NDA? Absolutely—just ask.
- Direct access to Priyesh.
- No sales presentation or obligation.
30-minute introduction
Choose a time that works for you
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