Mobile App Development Company in London

A focused MVP is in both stores 8 to 14 weeks after kick-off. A mid-scale product with a custom backend and third-party integrations takes 3 to 6 months. Fintech and health builds with FCA or NHS governance, multiple roles and legacy integrations usually run past 6 months, and we sequence them against your authorisation or pilot date. A new build lands on your phone every fortnight regardless.

No, and we do not pretend to. Appther is remote-first, with registered entities in the United States, India and Australia and no UK office. Our engineering team's hours overlap the UK working day, so stand-ups, demos and escalations happen while your office is open, and a named senior engineer is your single point of contact from kick-off to launch. Contracts, invoices and quotes are in pounds.

Yes. We design to FCA Consumer Duty outcomes, PSD2 strong customer authentication and the Open Banking Standard from the first screen, integrate with the UK's licensed account-information and payment-initiation providers, and build idempotent payment flows with a reconciled ledger and audit trails on every transaction. Authorisation and reporting to the FCA remain with you; our job is to make sure the product and its documentation support them.

Yes. Consumer, retail and B2B companion apps usually start on Flutter or React Native so one codebase covers both stores on one budget. Products that lean on hardware, heavy graphics, background processing or platform-specific features go native in Swift or Kotlin. We decide during discovery and record the reasoning in the scope.

Compliance is mapped with your counsel in discovery and engineered into the product. For UK GDPR that means a lawful basis for each processing activity, a data-protection impact assessment where one is needed, data-subject rights flows and 72-hour breach readiness. For PECR it means consent before any marketing push, SMS or email. For NHS work it means DTAC evidence, the Data Security and Protection Toolkit and clinical-safety documentation to DCB0129. Controls are documented as they are built, so the ICO or a trust's governance team can retrace them.

In the UK by default: AWS London (eu-west-2) or Azure UK South, inside your own cloud account, with backups that stay in region. Where engineering happens outside the UK we document the international-transfer safeguards your DPO will ask for, and production data never leaves the UK region without your written agreement.

You do, and it is written into the contract: repositories under your organisation, App Store and Google Play accounts in your company's name, infrastructure in your own tenancy. An NDA comes before discovery, intellectual property transfers as invoices are paid, and moving the work in-house later is a matter of removing our access.