Treevoxa is a React Native app development company for businesses that need an iOS and Android app without paying for two separate builds. We build with React Native and Expo, from one TypeScript code base, and we build the API and admin tools behind the app too. Two of our own products ship React Native apps: MatrixHR and RE-ERP.
React Native apps in production
- MatrixHR's mobile app is built with Expo and Expo Router, uses the phone's location through Expo modules, and talks to the same NestJS API as the web app, with the same logins and permissions.
- RE-ERP's mobile app uses React Navigation with bottom tabs and native stacks, Zustand for state, async storage, image capture, the file system, sharing and an embedded web view, on the same Node.js API and PostgreSQL database as the web app.
What a React Native app development agency builds
- Staff apps: clock-in, approvals, field work, stock counts and photo evidence.
- Customer apps: bookings, orders, payment plans, statements and notifications.
- Companion apps for an existing SaaS product or web app.
- Rescues of React Native apps that crash, lag or fail store review.
How we build React Native apps
- One API for every client. The app, the web app and any partner use the same documented API.
- Offline where it matters. Data the user needs in the field is cached; actions are queued and synced, with conflicts handled by rule.
- Secure by default. Tokens in secure storage, no secrets in the app, permissions requested only when needed.
- Fast to update. Over-the-air updates for fixes that do not need a store review.
- Measured. Crash reporting and analytics from the first test build.
Tech stack for React Native projects
| Part | What we use |
|---|---|
| App | React Native, Expo, Expo Router, TypeScript |
| Navigation and state | React Navigation, Zustand, async storage |
| Device features | Camera and image picker, file system, sharing, location, web views |
| Back end | NestJS or Express on Node.js, FastAPI on Python, PostgreSQL |
Technologies related to React Native
React Native shares its language and much of its thinking with React development, and our apps usually sit on a NestJS back end. For the wider picture, including when a mobile website beats an app, see mobile app development.
Engagement models for React Native work
- Fixed scope for a first version, paid per milestone.
- Dedicated React Native developer working only on your app, billed monthly. See hire dedicated developers.
- Hourly for audits, fixes and store-review problems.
What a React Native app costs
A React Native app's cost depends on the number of screens, offline needs, device features, integrations and whether the back end exists. Our custom software development cost guide explains how quotes are built. We quote in US dollars, in writing.
Who React Native development is for
- Companies with a React web app that want a mobile app sharing its logic and skills.
- Businesses with field staff who need to record work, photos and signatures on site.
- SaaS products whose customers ask for a phone app.
- Owners of a struggling React Native app that crashes, lags or fails store review.
React Native pitfalls we avoid
- Too much state in the app. The server stays the source of truth; the app caches what it needs.
- Unplanned offline behaviour. We decide early what works offline and how conflicts are resolved.
- Secrets in the bundle. Anything in the app can be extracted; keys and secrets stay on the server.
- Ignoring store rules. Privacy details, permissions text and review guidelines are part of the plan, not a surprise at submission.
What to send us for a React Native app quote
Who will use the app, the five most important things they will do in it, the systems it must connect to, and whether those systems have an API.
Can you add a React Native app to our existing web product?
Yes. If your web product has an API, the app can use it with the same logins and permissions. If not, we build the API first.
Questions to ask before you hire a React Native team
- Can we install an app you built and use it?
- How will the app work offline, and how are conflicts resolved?
- Where are secrets kept, and how is sign-in secured?
- How will you handle store review and privacy declarations?
- What does maintenance cost after launch?
Ask every bidder the same questions, in writing, and compare the answers before you compare the prices.
Working across time zones on React Native projects
We work remotely with a daily overlap window in your working hours, agreed before the project starts. New test builds land on your phone at the start of your day.