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pixelmatch vs jest-image-snapshot: open-source visual regression tools compared

Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.

Summary

pixelmatch: JavaScript library for pixel-level image comparison with anti-aliasing detection, for Node.js and browsers.

jest-image-snapshot: Jest matcher that compares PNG screenshots against stored baseline images for visual regression tests.

Both are listed under Visual regression. The table gives repository metrics from the GitHub API with their fetch date, then the documented facts used for every comparison in this category, each linked to the README or docs page it comes from. A cell reads "not documented" when the fact was not found in the project's documentation (4 of 12 fact cells here); that does not mean the feature is absent.

Side by side

pixelmatch and jest-image-snapshot: metrics and documented facts, in the fixed row order used for visual regression comparisons.
Factpixelmatchjest-image-snapshot
Stars6,95713,9151
Forks32812101
Contributors191801
Last release2026-04-2912026-03-091
Last commit2026-09-1512026-05-151
Commits in 90 days11101
LicenseISC1Apache-2.01
Primary languageJavaScript1JavaScript1
Statusactive1slow1
Browsersnot documentednot found in the project's documentation as of not documentednot found in the project's documentation as of
Framework integrationsnot documentednot found in the project's documentation as of Jest (matcher; stored images update with jest --updateSnapshot) source: README
Test authoring formatCode (JavaScript function on raw image data); CLI binary for PNG images source: READMECode (Jest matcher toMatchImageSnapshot on PNG image buffers) source: README
CI integrationnot documentednot found in the project's documentation as of Example Jest reporter that uploads failed diff images from a CI server to AWS S3 source: README
Report formatsDiff image output and a count of mismatched pixels source: READMEDiff images; optional base64 diff string in console output source: README
Install methodnpm (npm install pixelmatch); browser import from a CDN source: READMEnpm (npm i --save-dev jest-image-snapshot) source: README

1 Fetched from the GitHub or GitLab API on . Hover a value for its own date.

When each fits

Written from each project's documented scope, not from preference. Neither tool is ranked.

pixelmatch

Fits projects that compare screenshots pixel by pixel from JavaScript code; its README describes anti-aliased pixel detection and perceptual color difference metrics. source: README

jest-image-snapshot

Fits projects that add visual regression checks to Jest test suites; its README describes a Jest matcher that performs image comparisons using pixelmatch. source: README

More on these tools

Sources

  1. GitHub REST API: repository, read
  2. GitHub REST API: repository, read
  3. GitHub REST API: contributors, read
  4. GitHub REST API: contributors, read
  5. GitHub REST API: latest release, read
  6. GitHub REST API: latest release, read
  7. GitHub REST API: commits, read
  8. GitHub REST API: commits, read
  9. README, read
  10. README, read

Documented facts collected 2026-09-22. See the methodology for how metrics and facts are gathered.