Product demo: Calibre leaving a GitHub pull request comment summarising performance characteristics

Performance reviews directly in Pull Requests

See the performance impact of your work without leaving GitHub.

Try for freeor View documentation
Product demo: GitHub pull request actions. Netlify, Image compression and Calibre working together
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.

Product demo: A chart showing a marker for a recent deployment
Know how releases affect metrics

Tag deployments

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

Product demo: 20 Pages tested. The product and cart pages failed their checks.
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.

We've integrated with Vercel (previously ZEIT), 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 (previously ZEIT).

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