# callstack/reassure

Performance testing companion for React and React Native

Repository: https://github.com/callstack/reassure
Canonical: https://ross.abutalabs.com/products/reassure
Homepage: https://callstack.github.io/reassure/
Language: TypeScript
License: MIT
License Family: permissive
Topics: performance, performance-testing, react, react-native, regression, testing, hacktoberfest
Last push: 2026-07-22T08:04:10+00:00

## Health v2 (maintenance only)
Score: 91/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 93, release rhythm 82, longevity 100
- inputs: {"age_days": 1651, "days_push": 42, "days_rel": 42, "gap_med": 36.5, "n_releases_24m": 7}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1479, forks 38 (observed 2026-08-28T04:04:50.635737+00:00)

## What it is
Reassure is a performance testing library for React and React Native that automates performance regression testing. It measures render duration and counts across repeated runs, applies statistical analysis, and generates human-readable reports for CI or pull request comments.

## Use cases
- catch performance regressions in react native apps automatically
- write performance tests alongside react native testing library tests
- measure render duration and render counts of react components
- run performance regression checks on CI for pull requests
- benchmark function and async function performance in javascript
- compare performance between stable branch and code changes

## When to choose
- you maintain a React or React Native app and want automated performance regression detection
- you already use React Native Testing Library and want to extend tests into performance tests
- you want statistical significance analysis rather than single-run benchmarks
- you need performance reports posted to pull requests via CI

## When to avoid
- you need deep profiling like flame graphs or CPU sampling from a profiler tool
- your project is not React or React Native
- you need load or stress testing of servers rather than component render performance

## Facets
- artifact type: library
- maturity: active
- function: testing, benchmarking
- domain: testing, frontend, performance, developer-tools, mobile-development
- platform: cross-platform, cli
- tags: react, react-native, performance-regression, ci-integration, statistical-analysis, nodejs

## Member repositories
- callstack/reassure (main) score 91

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:50.635737+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:34:18.631730+00:00, confidence not recorded.
  - readme: https://github.com/callstack/reassure (fetched 2026-08-28T04:04:50.635737+00:00, sha 7280add55340)
  - homepage: https://callstack.github.io/reassure/ (fetched 2026-08-29T11:41:32.064528+00:00, sha 7a6b8d914793)
  - site_page: http://oss.callstack.com/reassure/docs/introduction (fetched 2026-08-29T11:41:32.073776+00:00, sha 07c00a4a3374)
  - registry_npm: https://registry.npmjs.org/reassure (fetched 2026-08-29T11:41:32.075881+00:00, sha 36d3927126ac)
- Data as of 2026-08-30T08:39:29.467469+00:00.