Your Shopify store deserves an app built for it.
Off-the-shelf apps don’t fit every workflow. We build custom Shopify apps and private integrations that do exactly what your store needs — nothing more, nothing less.
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- Custom Shopify private apps for internal workflows
- ERP, CRM & accounting integrations via Shopify API
- Automated order management & fulfilment apps
- Custom storefront logic & checkout extensions
Services delivered to clients across the world.
Every kind of custom Shopify app
From lightweight private apps to complex multi-system integrations, we’ve built them all.
From idea to live app in weeks
No long discovery phases. We move fast without cutting corners.
What our clients say
Real projects. Real results. No stock testimonials.
Operations Manager
"Dellos built us a custom inventory sync between Shopify and our warehouse system. It just works. We saved 15 hours a week on manual data entry."
CTO
"We needed a private app to handle B2B pricing rules that Shopify doesn't support natively. Dellos scoped it perfectly and delivered in 3 weeks."
Agency Director
"As an agency we outsource Shopify app work to Dellos regularly. Reliable, communicative, and the code quality is solid. Wouldn't use anyone else."
How much will my Shopify app cost?
Frequently asked questions
What's the difference between a private app and a public Shopify app?
A private app is built exclusively for your store — it doesn’t appear in the Shopify App Store and is only accessible to you. A public app can be installed by any Shopify merchant. Most custom workflow tools are private apps.
How long does a typical project take?
Simple private apps usually take 1–2 weeks. Medium complexity integrations typically take 3–5 weeks. Complex multi-system builds can take 6–10 weeks. We’ll give you a precise timeline in our proposal.
Do you work with agencies on a white-label basis?
Yes. We regularly work as the development partner for agencies who need Shopify app development capacity. We’re happy to work under NDA and stay in the background entirely.
How long does Coupa supplier enablement take?
Most Coupa supplier enablement projects take 2–4 weeks, depending on the supplier’s ecommerce platform, catalog complexity, and the procurement testing requirements of the enterprise buyer.
What do you need from us to get started?
Just a 30-minute call to understand what you need. We’ll take it from there — spec, proposal, timeline, and cost — within 48 hours of the call.
What happens after the app is built?
You get full ownership of the code, documentation, and deployment credentials. We also offer ongoing maintenance and support packages if you’d like us to manage updates and monitor performance.
Do you have case studies on Shopify apps you've built?
Yes — we recently completed a complex B2B ecommerce build for a mid-market electrical supplier in the US. The project involved a custom Punchout integration, a QuickBooks Online sync, and a standalone reporting portal built in React to handle an enterprise organisational hierarchy that Shopify doesn’t natively support. You can read the full case study here
Ready to build your Shopify app?
Book a free 30-minute discovery call. No commitment, no sales pitch — just a conversation about what you need.