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App development: custom web apps and internal tools

Web apps and internal tools built around your process, from a clickable prototype to a secure release. Fixed written quote, based in Tallinn.

Updated: 2 October 2026By the OpenWeb360 team

Need an app that fits your process instead of a generic tool? We build custom web apps and internal tools, from a clickable prototype to a secure, production-ready release.

What we build

  • Customer portals and dashboards orders, documents, bookings and status in one place.
  • Internal tools quoting, order handling, scheduling and simple back-office systems that replace spreadsheets.
  • MVPs for startups the smallest working version of a product, ready to test with real users. See SaaS and MVP development.
  • Apps started in AI tools such as Lovable that now need to be secure, fast and findable. See Lovable developer.

How it works

  1. 30-minute call: we clarify the goal, users and the smallest useful first version.
  2. Clickable design: you see and approve the screens before development, which saves rework.
  3. Build in short steps with regular check-ins, so you always know where things stand.
  4. Security, speed and launch: access rules, backups, performance and a proper release.
  5. Handover and support: clean repository, documentation and help on working days after launch.

Web app, mobile app or both?

We usually start with a web app that works well on phones, because it is faster to build, easier to change and needs no app store. If you truly need a native mobile app (for example for offline use or deep device features), we tell you honestly and scope it separately.

What a good app needs

  • Clear access rules, so each user sees only what they should.
  • Fast, simple screens that people actually use.
  • Backups, monitoring and a plan for updates. See website maintenance.
  • Code and accounts that belong to you.

How we quote

The scope of an app varies a lot, so we give a written fixed quote after the call, split into phases for larger projects. Prices exclude VAT because we are a VAT payer. For the website, brand and marketing part see our pricing page.

Frequently asked questions

How long does an app take?

A narrow first version can be ready in weeks, a more complex one in months. We give a timeline together with the quote.

Will I own the code?

Yes. You own the result, and we hand over the repository and access.

Can you take over an app someone else started?

Yes. We start with a written review of code, security and speed and keep what works.

How do I get a quote?

Book a free 30-minute call or send a short description of what you need.

Have an app in mind?

Tell us what it should do. We'll scope it and give a written quote.

Get a quote→

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