SpeedCurve alternative
Calibre vs SpeedCurve
See the Chrome UX Report data Google uses, right next to your Real User Monitoring and Lighthouse tests. Start a free trial today, no demo needed.
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How Calibre and SpeedCurve differ
Updated
| Feature | ||
|---|---|---|
| Real User Monitoring | ||
| Session ID storage | A first-party cookie | sessionStorage, no cookies |
| Chrome UX Report (CrUX) | ||
| Google CrUX data | Not offered | Every plan, no setup |
| Synthetic Monitoring | ||
| Synthetic test history | Kept for 13 months | Kept for the life of your account |
| Plans and pricing | ||
| Entry price | From $90 a month | $75 a month |
| Getting started | Request a demo | Free 15-day trial, no credit card required |
| Access and automation | ||
| SAML single sign-on | Enterprise plan, billed yearly | Self-serve on the $150 Team plan |
| SCIM provisioning | Not supported | Included with SAML |
| MCP server | Not in SpeedCurve’s docs | Every plan |
| Company | ||
| Company | Part of Palo Alto Networks | Independent since 2017 |
Calibre and SpeedCurve both include
- Real User Monitoring
- Scheduled synthetic tests with Lighthouse scores
- Performance budgets
- Pull request reviews
What’s in Calibre
Real User Monitoring
- LCP, INP, CLS and TTFB from your visitors, plus a UX Rating
- Subparts for LCP, INP and TTFB, so you can see which part is slow
- The element behind each slow LCP, CLS and INP
- Split by page, page group, device, browser, OS, country and city
- Every navigation type, including back/forward cache, prerender and soft navigations
- P50, P75, P95 and P98 for every metric
- Compare each deployment with the one before
- No cookies or localStorage, with optional EU and EEA exclusion
Chrome UX Report (CrUX)
- Google’s Core Web Vitals for your origin and each key page
- Pages found automatically by scanning your site
- History from the day you add a Site, charted up to 24 months
- Pass or fail against Google’s Core Web Vitals assessment
- The share of good, needs improvement and poor visits
- LCP subparts from real Chrome users
- UX Rating by country, device and navigation type
- Rank your site against competitors, with nothing to install
Synthetic Monitoring
- A full Lighthouse audit on every test: Performance, Accessibility, Best Practices and SEO
- 17 test locations, 12 device presets and 14 network speeds
- Hourly, daily or custom schedules, plus tests on demand
- Logged-in pages, with login forms, basic auth, cookies or headers
- Performance budgets on any metric, with email, Slack and webhook alerts
- A speed report in every pull request
- Filmstrip, long tasks and third-party impact for every test
- Results kept for the life of your account
Teams and automation
- SAML single sign-on with SCIM, self-serve on the Team plan
- Enforced SSO, verified domains and passkeys
- Audit log streaming to your SIEM, on the Company plan
- Admin, User and Viewer roles
- CLI, Node.js API and GraphQL API on every plan
- An MCP server for Claude Code, Cursor and other coding agents
- Webhooks, plus Slack, GitHub, Netlify and Zapier integrations
- Export metric history as CSV
Switching from SpeedCurve
We’ll help you move
Set it up on a call with our founder, or script it yourself. Either way, your Core Web Vitals history is there from day one.
Set up on a call
Book a call with Ben, Calibre’s founder. We’ll add your Sites, recreate your budgets, install the RUM snippet and connect GitHub and Slack with you.
Book a setup call →Script the setup
Create Sites, pages and Test Profiles from code with the Calibre CLI, Node.js API or GraphQL API. This is useful when you have many Sites to move.
Read the CLI docs →Start with your history
Calibre pulls Google CrUX history as soon as you add a Site. Your Core Web Vitals trends are there from the first day, with no wait to build history.
Learn about CrUX Monitoring →“Thanks to Calibre’s reporting, we were able to detect a massive downgrade in performance.”
CrUX Monitoring
See what Google sees, alongside your own data
CrUX is the data behind Google’s Core Web Vitals assessment. Calibre tracks it next to your RUM and Lighthouse results.
Google CrUX data, ready on day one
Add a Site and Calibre finds its key pages and pulls their Chrome UX Report data straight away, then charts up to 24 months of history. No BigQuery, no script to install.
Learn about CrUX Monitoring →Rank your site against competitors
Add competitor sites to a Team and Calibre ranks every site by UX Rating, LCP, CLS and INP on CrUX data. Nothing to install on their sites.
Learn about competitor benchmarking →Questions about switching from SpeedCurve
Is Calibre a good SpeedCurve alternative?
Yes, if you want Google CrUX data next to your RUM and Lighthouse results. Calibre includes all three on every plan from $75 a month, with a free trial you can start yourself.
How does Calibre’s pricing compare with SpeedCurve’s?
Calibre starts at $75 a month with Real User Monitoring, CrUX data and Lighthouse tests included, and the Team plan is $150 a month with SAML single sign-on. SpeedCurve starts at $90 a month and offers single sign-on on its Enterprise plan. Calibre counts Real User Monitoring by sessions, not page views, so a visitor who browses ten pages in one tab counts once.
Is Calibre independent?
Yes. Calibre has been independent, bootstrapped and profitable since 2017. SpeedCurve joined Embrace in November 2025, and Palo Alto Networks completed its purchase of Embrace in August 2026.
Can I try Calibre without talking to sales?
Yes. Start a free 15-day trial, no credit card required, and run Calibre alongside SpeedCurve while you decide. Synthetic results will differ a little, since each tool tests from its own locations and devices.
Does Calibre support SSO, SCIM and audit logs?
Yes. SAML single sign-on with SCIM provisioning is self-serve on the Team and Company plans, and you can require SSO for everyone. The Company plan adds a security audit log of sign-ins, member changes and API key activity, which you can stream to your SIEM.
How do I switch from SpeedCurve to Calibre?
Add your Sites to Calibre. It finds your key pages, pulls their CrUX data and starts Lighthouse tests straight away. Then add Calibre’s RUM snippet in place of SpeedCurve’s, recreate your budgets, and connect GitHub and Slack. Or book a setup call and we’ll do it with you.
Need help to dial in your new speed system?
Our friendly, knowledgeable team will help you establish a system that works efficiently or answer any questions. We’re here to support you in your web performance journey. Contact support.
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Fast website, happy customers
Start a free 15-day trial, or book a setup call and we’ll move you across.
