Custom app development
We design and build mobile and web applications — and then either keep them running or hand them over to you. Simple projects can be live two months after signing. Everything else depends on how complex it actually is.
What we build
The platform is decided per project, not by what we happen to prefer:
iOS and Android
Native mobile applications. Onrian holds its own Apple developer account, so releasing to the App Store does not depend on you setting one up.
Web applications
From a website with an admin interface through to a full web application, optimised for search engines and for AI assistants.
We do not currently develop desktop software for PC.
How we work
Everything is arranged per project — there is no fixed package:
- We can design the product, not just implement someone else’s design.
- Development is done in-house. Where an external service genuinely fits better, we use it and say so.
- The platform — iOS, Android, web, or a combination — is agreed with you, not assumed.
- After launch, Onrian can handle maintenance and support.
- Or the project is handed over in full and your own team takes it from there. Both are normal.
How long it takes
A straightforward application can be live two months after the contract is signed.
That is the fast end, and it depends heavily on complexity. An app with a real backend, several user roles and integrations takes considerably longer. We would rather tell you the honest number at the start than the pleasant one.
What it costs
A simple website with an admin interface, SEO and AI-search optimisation: from CZK 20,000.
Beyond that we do not publish a price, because the range is too wide for a number to mean anything. Custom applications are quoted per project once we know what is actually being built. You will have a figure before any work starts.
What we do not do
Desktop software for PC
Not currently part of what we build. Mobile and web only.
Selected work
- Pulse Club
- A Bluetooth-proximity dating app for iOS — “meet people who are actually here”. Built by Onrian end to end, EU-hosted and GDPR-native, currently heading to the App Store. Android is on the roadmap.
- Travel agency
- A reservation website for a travel agency, including the booking flow and the administration behind it.
Common questions
How long does it take to build a custom app?
A straightforward application can be live around two months after the contract is signed. The timeline depends heavily on complexity — an application with a substantial backend, multiple user roles or third-party integrations takes considerably longer.
How much does a custom application cost?
A simple website with an admin interface, SEO and AI-search optimisation starts at CZK 20,000. Larger custom applications are quoted per project, because the range is too wide for a published figure to be meaningful. A price is agreed before any work begins.
Which platforms does Onrian develop for?
iOS, Android and web, decided per project. Onrian holds its own Apple developer account, so App Store releases do not depend on the client setting one up.
Do you design the app as well, or only build it?
Both. We can design the product ourselves, and we can also implement a design you already have.
Who maintains the application after launch?
Either option works. Onrian can provide ongoing maintenance and support, or the project can be handed over in full so your own team runs it. This is agreed up front, not left open.
Does Onrian build desktop software for PC?
No. Desktop software for PC is not currently part of what we develop — we build mobile and web applications.
Have something you want built?
Describe what it should do and who will use it. If we are the wrong people for it, we will tell you that too.