We’re Fortnight — a London-based team creating polished mobile apps for ambitious businesses.
Trusted by teams at
Turn your idea into an app with research, design and development focused on what matters first.
Improve your app’s design, performance or code, with a clear plan for what needs to change.
Add features and integrations, improve existing flows and keep your app up to date.
Clear priorities and a practical plan for your app
User flows, polished screens and prototypes you can test
iOS and Android apps built around your requirements
Connect your app to the data and services it needs
Check the details and get your app ready for release
Keep your app up to date and add what comes next
Look at your goals, user needs and the work ahead.
Turn the plan into clear screens and prototypes you can try.
Write the code, connect your services and test across devices.
Get your product live, review feedback and prioritise future updates.
Budget £40,000–£60,000 for a simple mobile app. A more complex product can exceed £100,000. These are planning ranges, not fixed packages or a minimum project fee. Your quote depends on the user journeys, iOS and Android coverage, backend, integrations, testing and launch. We price prototypes, design-only work and improvements to an existing app separately. See our UK app development cost guide for the full breakdown.
We set out the agreed scope for design, development, integrations, testing, launch and handover, alongside exclusions and third-party costs. Post-launch support and new features are priced separately.
A focused MVP can be ready for app store submission from 6-8 weeks after the scope is agreed. We use AI to speed up suitable development tasks, while integrations and testing still shape the schedule. We confirm your project timeline during discovery; Apple and Google review the app after submission.
Yes. We can build for either platform or both. We assess native and cross-platform options against your users, device requirements, budget and future maintenance.
Yes. We define the core user journey and the data, admin tasks and testing needed for a usable first release. We can prototype the idea first; a clickable prototype is different from a live MVP.
Yes. We review the user experience and technical constraints, then scope a focused redesign, new features or a rebuild where needed. Our Thursday project shows UX/UI redesign work on an existing app.
Yes. We can deliver research, user flows, prototypes, UI and a handover for your developers without taking on the build. Explore our UX/UI design services.
Yes, when launch support is included in the scope. We help test, prepare and submit the app; Apple and Google control review and approval.
Yes. We can agree coverage for bug fixes, compatibility updates and new features. The scope, response expectations and third-party costs are set out separately.
Didn't find yours? Write to hello@fortnight.studio
Tell us what’s working, what isn’t and what you want to change. We’ll help you decide where to focus.
