Enforcing a concrete performance budget for Expo EAS builds and OTA updates
The situation Say you are a mobile engineer on a small React‑Native team that uses Expo Application Services (EAS) for CI‑driven builds and over‑the…
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One .web.tsx in the whole app, and it is 196 lines of stack navigator that no phone will ever run
Munchable's phone app is also a website. Same Expo Router tree, same screens, exported with web.output: "single" and served at app.munchable.app . A…
Deep‑link crashes in Expo Router when the app hits real traffic
The situation You are a mobile lead on a React Native product that just shipped version 2.4 with Expo Router 2.1.0. The release added a “share‑to‑ap…
Migrating a React Native app to the new EAS build and OTA workflow without a release freeze
The situation You are the lead mobile engineer on a React Native app that ships to 150 000 active iOS and Android users. The app currently uses the…
Six mobile app UIs you can tap through in a browser tab (Expo + React Native Web)
A screenshot of an interface tells you what it looks like. It doesn't tell you how it feels — what happens when you tap, how a sheet rises, whether…
On-Device Computer Vision in React Native: Auto-Aligning Progress Photos with MediaPipe and Expo
A person can take thirty photos of the same face and still produce a timelapse that looks like camera shake. On Monday they stand closer to the mirr…
Expo SDK 58 beta opens with iOS 27 support and a faster build pipeline
You update your simulators, iOS 27 drops, and every app you haven't rebuilt yet either misbehaves or just looks wrong on the new scene-based life cy…
From bug report to verified pull request: how an agent fixes bugs using EAS Simulator
A user files a bug report that says "Settings crashes when I scroll to the bottom." No stack trace, no reproduction steps, no screen recording. You'…
Shipping my first mobile app: what an operations leader learned taking PromptSpend to iPhone and Android
I spent 15 years running operations and P&Ls, not writing apps. In August I set out to put PromptSpend, my open-source LLM cost calculator, on i…
Reduce Expo Monorepo CI Build Time
Expo monorepo CI gets slow and flaky for the same reason: we treat all caches as one thing. Then builds run from the repo root, one app reuses anoth…
I Ship Mobile Apps for $0: Vercel + Render + Supabase Free Tier
TL;DR: My entire mobile stack costs $0 a month. Expo builds the app. Supabase holds data and auth. Render runs background jobs. Vercel hosts the lan…
Expo + Supabase GitHub Auth Broke 3 Times — Here's the Fix
TL;DR: GitHub login in my Expo app broke three separate times. A deep link that went nowhere. A PKCE flow I wired backwards. A redirect URL with a t…
I tried to live an entire day inside apps built with Expo. Here's where it broke.
There are thousands of apps on the App Store and Google Play running on Expo 's open source tooling. That's a big number, but it doesn't tell you mu…
12 AEO Best Practices for docs
If you've watched a coding agent quietly read your documentation, run a command based on what it found there, and never once render the page in a br…
Claude Code on a React Native Codebase: Guardrails That Actually Change the Output
Every React Native developer has run the same experiment by now: point an AI agent at the codebase, ask for a feature, watch it produce something th…
Running an Expo SDK 57 app in Expo Go? You now need to be logged in on both ends
You scan the QR code like you've done a hundred times before, npx expo start is running, the terminal looks fine, but the app on your phone just sit…
Spec-Driven Development in React Native: an MVP that lists the world's earthquakes, specified before writing code
A coding agent can already write a working app in an afternoon. The problem is no longer producing the code; it is something else: without a specifi…
How SWSH turned 300 monthly builds into a release pipeline nobody has to babysit
"Expo's ecosystem helped us take human error and effort out of the release process, from a local build to a validated release." — Nathan Ahn, CTO, S…
I shipped an alpha notes app where the home screen is the capture field
Miniout is a university notes/tasks app. UI is Spanish-only for now. The idea: you should not pick a folder in the middle of a lecture. Write first;…
Why your App Tracking Transparency prompt doesn't show up (and how it got my app rejected)
App Review rejected my iOS app under Guideline 2.1. The note said reviewers were unable to locate the App Tracking Transparency permission request w…
Supporting Language Switching for Date Formats, Not Just Text, with i18next
This article is an English translation of the original Japanese article. After introducing i18next to a React Native app, dates like 7月24日(金) remain…
Build vs Buy: What Founders Get Wrong About Templates
Every week a founder DMs me the same question: "Should I build my React Native app from scratch or buy a template?" Here's the framework I use to an…
How much to share in a monorepo when building common features for web and mobile
This article is an English translation of the original Japanese article. When I added an Expo app to an existing Next.js web service, I initially wa…
The Crash JavaScript Couldn't Catch: Fixing Android Native Crashes in a React Native App
Our React Native app has one job that can't fail: know where the truck is. Truxo Tracker is the driver app for truxo.ai . Drivers accept freight loa…
Opening Web Invite Links Directly in the App with Expo Router
This article is an English translation of the original Japanese article. In my club management app, I use the following invite URL for both web and…
Life After CodePush: Choosing an OTA Update Strategy for React Native in 2026
Microsoft retired the hosted Visual Studio App Center service on March 31, 2025. That included the managed service many React Native teams knew thro…
Handling Notification Taps in expo-notifications: Launch vs. Runtime
This article is an English translation of the original Japanese article. When a user taps a push notification, the entry point differs depending on…
React Native i18n in 2026: A Practical Expo Router Playbook
If your React Native app only speaks English, you're leaving ~75% of smartphone users on the table. Here's the modern stack for shipping a multiling…
Migrating an Expo app from Japanese to multi-language support in stages
This article is an English translation of the original Japanese article. I migrated an Expo app from Japanese only to Japanese, English, and Simplif…
Why My Expo Router App Froze on the Splash Screen After a Cold-Start Notification Tap
This is an English translation of my original article on Qiita . My Expo app occasionally stayed on the splash screen when it was launched by tappin…