GitHub pull request comment with a summary of changes to speed

Performance reviews directly in Pull Requests

See the performance impact of your work without leaving GitHub.

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GitHub pull request actions with Calibre test marked as completed
Bring transparency to your team

Integrate with your developer platform

Calibre tests each Pull Request and compares it to current production metrics. Get a performance summary that’s visible to your entire development team.

Chart marked with a test invoked with a GitHub deployment
Know how releases affect metrics

Tag deployments

Calibre automatically tags deployments on metric charts. Always know which release caused improvements or regressions.

Excerpt of pull request summary showing a list of pages tested
Test changes against performance budgets

Ensure high quality

Performance summaries highlight regressions and guarantee changes exceeding set budgets won’t ship to production. Don’t compromise what your users experience.

Logos of Vercel, Netlify and Heroku
Use your favourite deployment tool

Works wherever you do

Pull Request Reviews are available on GitHub and integrate with the most popular deployment platforms: Heroku, Netlify and Vercel.

Calibre is a developer-friendly performance companion that works wherever you are