facebook/hermes
A JavaScript engine optimized for running React Native. observed · 2026-08-28
Health v2 · maintenance only
67/100
- Activity 99
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 2872
- days_rel: n/a
- days_push: 7
- n_releases_24m: 0
Adoption not part of the score
11272 stars · 847 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
Hermes is a JavaScript engine developed by Meta, optimized for fast start-up of React Native apps through ahead-of-time static optimization and compact bytecode. It can be built as CLI tools to run JavaScript directly and is the default engine for React Native.
Use cases
- run react native apps with faster startup time
- embed a lightweight javascript engine in a mobile app
- compile javascript to compact bytecode ahead of time
- reduce memory usage of a javascript runtime on mobile
- build and hack on a javascript engine from source
- run javascript from the command line
When to avoid
- you need a general-purpose Node.js-compatible JavaScript runtime
- your project depends on Node.js APIs or npm ecosystem at runtime
- you need the latest ECMAScript features immediately, as Hermes lags V8/JSC in some support
Facets
library · maturity active
interpreter compiler developer-tools mobile-development programming-languages compilers performance windows cpp javascript-engine react-native bytecode aot-optimization runtime android ios macos linux
1 source
- readme: https://github.com/facebook/hermes · fetched 2026-08-28 · 2bf480382ea9
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| facebook/hermes | main | 67 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem