Calibre combines Real User Monitoring, CrUX, and Synthetic Testing in a single platform — each data source answers different questions, and having them together lets teams cross-reference without switching tools or getting distracted building your own monitoring system.
Calibre vs Lighthouse and PageSpeed Insights#
Google Lighthouse and PageSpeed Insights are excellent starting points for understanding a page’s performance. Calibre builds on Lighthouse by adding the features teams need once performance monitoring becomes an ongoing practice rather than an occasional check.
| Lighthouse / PSI | Calibre | |
|---|---|---|
| Test type | One-off audit | Scheduled, continuous monitoring |
| Pages | Single URL | Multiple pages, devices, locations |
| History | None | Trends, regression detection |
| Budgets | No | Metric alerts for Pages or Test Profiles |
| PR reviews | Build your own custom scripting, hosting, management, etc | Yes, connects with GitHub or CI/CD pipelines |
| Auth pages | Build your own custom scripting, hosting, management, etc | Cookies, HTTP headers, Form based logins |
- Historical trends and regression detection — track results over time and compare performance before and after deployments.
- Performance budgets — alert teams when metrics cross a threshold, configurable per page and per Test Profile.
- Pull request reviews — compare the performance of a preview deployment against the live site before code is merged.
- RUM and CrUX alongside synthetic — verify whether a Lighthouse improvement translates to a better experience for real users.
Calibre vs full-stack APM tools#
Application Performance Monitoring platforms such as Datadog and New Relic are powerful tools for monitoring backend infrastructure, server response times, error rates, and distributed traces.
For teams where the primary performance concern is front-end speed rather than server-side processing, Calibre provides focused, purpose-built web performance monitoring without the complexity and cost of a full-stack platform.
| APM tools (Datadog, New Relic) | Calibre | |
|---|---|---|
| Focus | Backend infra, errors, traces | Front-end web performance |
| CrUX data | Not offered | Spiders your website, collects real-user experience data |
| Lighthouse tests | Desktop only | Every test, desktop and mobile |
| Budgets | Alerts you build on metrics | Web-metric-specific budgets |
| Auth page testing | Scripted login steps | Login forms, cookies + HTTP headers |
| Complexity | Full-stack data platform | Focused, purpose-built |
- Built-in CrUX tracking — monitor search ranking signals directly.
- Lighthouse on every synthetic test — desktop and mobile, including pull request reviews.
- Third-party script analysis — quantify the performance cost of each external script, font, and resource.
- Web-metric-specific performance budgets — thresholds designed for front-end metrics.
- Auth page testing — Test Profiles can include cookies and HTTP headers, allowing teams to test logged-in experiences and internal applications.
Calibre vs dedicated performance platforms#
Calibre includes Real User Monitoring, CrUX data and synthetic Lighthouse tests on every plan. Each comparison sets out what Calibre adds over another tool.
- Calibre vs DebugBear: Calibre includes Real User Monitoring on every plan, from $75 a month.
- Calibre vs SpeedCurve: Calibre adds Google CrUX data on every plan, and you can start a trial without talking to sales.
- Calibre vs RUMvision: Calibre adds scheduled Lighthouse tests and a speed report in every pull request.
- Calibre vs GTmetrix: Calibre monitors every page of your site, with Real User Monitoring from your own visitors.
- Calibre vs Pingdom: Calibre is built for page speed and Core Web Vitals, with a Lighthouse audit on every synthetic test.
- Calibre vs Catchpoint and WebPageTest: Calibre monitors your site on a schedule, rather than one test at a time.
- Calibre vs Datadog: Calibre focuses on website speed and Core Web Vitals, and runs alongside Datadog.
- Calibre vs New Relic: Calibre includes 10 seats on the $150 Team plan, so your whole team can see website speed.
See all comparisons.