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Shopify app development

Get hours back every week with custom Shopify apps.

We build private Shopify apps and integrations that connect your store to your ERP, warehouse and B2B systems. Your team stops re-keying orders and fixing stock errors, and spends that time growing the business instead.

The short answerOn Digital builds custom Shopify apps, Shopify Functions and system integrations, including ERP, 3PL, PIM and B2B pricing connections. Apps are built on Shopify's current APIs, documented, monitored and owned by you.

Trusted by growing ecommerce brands

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What you get

What custom software gives you.

We scope the process first, then build the smallest thing that removes the pain.

01

Hours back every week

Orders, stock and customer data sync automatically, so nobody is copying information between systems.

02

Stock you can trust

Live two-way syncing with your ERP and 3PL means fewer oversells, cancellations and refunds.

03

Wholesale that runs itself

Trade price lists, account approvals and quick order forms let B2B customers order without emailing your team.

04

Checkout rules that fit your business

Custom discounts, delivery options and payment rules run natively inside Shopify checkout.

05

Problems caught before customers notice

Monitoring and error alerts flag a failed sync straight away, not after a complaint.

06

Software you own outright

You get the code, the documentation and the repository. No lock-in and no licence fees to us.

What we fix

Where growing stores lose time.

Public apps are fine until your process stops being standard. Then the workarounds start costing real hours.

  1. Hours lost to copy and paste. Orders re-keyed into the ERP, stock updated from spreadsheets, and mistakes that turn into refunds.
  2. Five apps doing one job. Stacked apps fight each other, slow the store and break every time one of them updates.
  3. Processes Shopify cannot do alone. Trade pricing, bundles, custom checkouts and approvals that need logic no public app offers.
Why it pays off

Why it pays for itself.

Integrations pay back twice: your team gets its time back, and fewer mistakes reach your customers.

  • Fewer errors, refunds and cancellations
  • Faster, more accurate fulfilment
  • Fewer paid apps to maintain
  • Room to grow without hiring for admin
How it works

Scoped tightly, shipped in sprints.

Step 01

Map the process

We sit with the people doing the work and document where time and money are lost.

Step 02

Spec and estimate

A short technical spec with a fixed estimate and a clear definition of done.

Step 03

Build in sprints

Two-week sprints with demos, so you see progress and can change direction early.

Step 04

Launch and monitor

Staged rollout, monitoring in place, and support once it is live.

Still deciding?

The questions brands ask us most before getting started.

What is a custom Shopify app?

A custom or private app is software built for one store's needs. It connects to Shopify through the official APIs and can add admin tools, storefront features or integrations with other systems.

Can you integrate Shopify with our ERP?

Yes. We have connected Shopify to common ERPs, warehouse systems and PIMs. If there is an API, we can sync stock, orders, customers and pricing in both directions.

How much does a Shopify integration cost?

It depends on the systems involved and how much logic sits between them. A one-way sync is a small project; a two-way ERP or B2B build is larger. You get a fixed estimate after a short scoping session.

Who owns the code?

You do. We hand over the repository and documentation, and you can maintain it in-house or with us.

Next step

What is your team still doing by hand?

Describe the process. We will tell you whether an app, an integration or a simple setting change fixes it.