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gammaLabz
Discuss your app

Mobile app development

Launch your mobile app on iPhone and Android

We design and build production-ready Expo and React Native apps, including backend development, payments, subscriptions, testing, and store releases.

Built and shipped for the App Store and Google Play.

  • iOS and Android delivery
  • Expo and React Native
  • Stripe and RevenueCat
  • App Store and Google Play releases
  • Backend and API integration
  • Testing and CI

Shipped mobile apps

Mobile apps we have shipped

Screenshot of MyEsim GR on iPhone
MyEsim GR icon
MyEsim GR
Mobile app
Browse eSIM plans for Greece, pay in-app with Apple Pay or Google Pay, and manage your connection from your phone.

Problem

Users needed a reliable way to browse eSIM plans for Greece, pay in-app, and manage their connection from their phone.

Built

A production mobile application with eSIM purchasing and activation, Stripe and wallet payments, backend integrations, App Store and Google Play delivery, and production testing for reliability.

Status

Live on the App Store and Google Play. Ongoing improvements and feature upgrades since launch.

ExpoReact Native FirebaseStripeApple Pay & Google PayGitHub Actions CIApp Store & Google Play
Download on theApp StoreGet it onGoogle Play
Screenshot of Guinea Pig Translator on iPhone
Guinea Pig Translator icon
Guinea Pig Translator
Mobile app
Record guinea pig sounds and get playful AI translations — with optional subscriptions on iPhone and Android.

Problem

A founder needed a consumer mobile app that could record guinea pig sounds, deliver playful AI translations, and support optional subscriptions.

Built

A consumer mobile application for iOS and Android with React Native, a FastAPI backend, Supabase, RevenueCat subscriptions, and store releases.

Status

Live on the App Store and Google Play, taking payments and serving real users.

React NativeFastAPIOpenAISupabaseRevenueCatApp Store & Google Play
Download on theApp StoreGet it onGoogle Play

What we deliver

Everything needed to ship your app

Product planning and MVP definition
Clarify the core user flow and the smallest version worth launching.
Expo and React Native development
One codebase for iPhone and Android with native-feeling interactions.
Backend and API development
FastAPI, Firebase, or Supabase backends wired to your mobile app.
Authentication and user accounts
Secure sign-in and account flows your users can trust in production.
Payments and subscriptions
In-app purchases, plans, and billing flows that work on real devices.
Stripe, RevenueCat, Apple Pay, and Google Pay
Payment providers integrated end to end for launch-ready billing.
Push notifications and analytics
Reach users at the right moment and understand how the app is used.
App Store and Google Play submission
Store listings, builds, and release steps handled through submission.
Automated testing and CI
Critical paths checked automatically before every release.
Maintenance and continued development
Keep shipping improvements after launch without losing momentum.

Is this the right fit?

A strong fit
  • You have an app idea and need an MVP
  • You already have a prototype that needs production hardening
  • You need one codebase for iOS and Android
  • You need payments, subscriptions, backend integrations, or authentication
  • You need help publishing to the app stores
  • Your existing app is unfinished, unstable, or difficult to maintain
Probably not the right fit
  • You only need a basic brochure website
  • You are looking for the lowest possible development price
  • You need a large outsourced development agency
  • You are not ready to define the product scope or collaborate on decisions

How we work

01
Understand the product
Clarify the users, core flow, business model, and technical requirements.
02
Define the first release
Agree on the smallest production-ready version worth launching.
03
Build and test
Develop the mobile app, backend, integrations, and automated tests.
04
Launch and improve
Submit to the stores, monitor production, and continue improving the product.

Client words

What teams say after shipping

“gammaLabz are responsive and I've never waited more than 24 hours for a reply. Fair pricing for what you get, and they've upgraded MyEsim GR enormously since I started working with them.”

Dimitris D.

Founder · MyEsim GR

“I started with nothing — no app, no store listing. About a month later the app was live on iPhone and Android, taking payments, and people were actually using it. I didn't think that was possible on my timeline.”

John R.

Founder · Guinea Pig Translator

Tell us about your app

Share your idea, current product, or biggest technical challenge. We will review it and tell you what a realistic first release could look like.

Prefer email? support@gammalabz.com