React Native and Expo
React Native builds native Android and iOS apps with React. Expo is the framework and tooling around it: native modules, builds and updates.
Visit expo.devCross-platform when it fits. The phone app of my own life OS runs on Expo.
Read: Hermes Has No JIT: Why Your React Native App Scrolls but Taps HangWhere I write about React Native and Expo
Articles on this site that mention it.
Nov 4, 2026 · Engineering
Hermes Has No JIT: Why Your React Native App Scrolls but Taps Hang
My phone app scrolled fine but ignored taps for seconds. A layout that took 192 ms in Node took 8.3 s without a JIT. How to measure phone JS honestly.
Nov 12, 2026 · Engineering
The 4.7 MB File I Didn't Split
A 4.7 MB JSON file crashed my app on read, and splitting it looked obvious. I timed it first: 13 ms. The bug was in how the file was written.
Oct 2, 2026 · Engineering
Six Crashes Importing Apple Health: What HealthKit Doesn't Tell You
My Apple Health import crashed six times. It was never memory: one unit label killed the process with no JS error. What I learned about HealthKit reads.
Mar 7, 2025 · Android Development
The Essential Roadmap to Building a Successful Android App
Building a high-performance Android app isn’t just about writing code—it’s about making the right strategic decisions from day one.