RUMvision alternative
Calibre vs RUMvision
Keep the real user data you rely on, and add scheduled Lighthouse tests and pull request reviews that catch regressions before they ship.
Free for 15 days. No credit card required.
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How Calibre and RUMvision differ
Updated
| Feature | ||
|---|---|---|
| Real User Monitoring | ||
| Visitor ID storage | localStorage, kept up to 90 days | sessionStorage, cleared when the tab closes |
| Synthetic Monitoring | ||
| Scheduled Lighthouse tests | Not in RUMvision’s docs | From your choice of 17 locations |
| Pull request reviews | Not in RUMvision’s docs | A synthetic speed report in each pull request |
| Plans and pricing | ||
| Entry price | €150 a month | €65 a month |
| Sites | 2 domains on Growth, 5 on Scale | Unlimited, on every plan |
| Access and automation | ||
| SAML single sign-on | Not in RUMvision’s docs | Self-serve on the Team plan, with SCIM |
| Command line tool | Not in RUMvision’s docs | Every plan |
Calibre and RUMvision both include
- Real User Monitoring
- Competitor benchmarking with CrUX data
- MCP for coding agents
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 RUMvision
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 detailed page breakdowns and filtering, I’ve found performance issues way deeper into customer journeys than I’ve seen before.”
Synthetic Monitoring
Catch regressions before your visitors do
Test every pull request and get an alert when a page goes over budget.
Catch regressions in pull requests
Calibre runs synthetic tests on each pull request’s preview deployment and posts a speed report in the pull request, before the change ships.
Learn about pull request reviews →Performance budgets on any metric
Set a budget for any synthetic metric, per page and Test Profile. Get an alert by email, Slack or webhook when it’s at risk or exceeded.
Learn about budgets →See the impact of every release
Calibre marks production deploys from GitHub automatically, and compares each release with the one before, for real visitors and in Lighthouse tests.
Learn about deploy tracking →Questions about switching from RUMvision
Is Calibre a good RUMvision alternative?
Yes, if you want Lighthouse tests and pull request reviews alongside Real User Monitoring. Calibre includes RUM, CrUX data and scheduled Lighthouse tests on every plan, for unlimited Sites and URLs.
Why run Lighthouse tests alongside Real User Monitoring?
A Lighthouse test runs the same page in the same conditions every time, so changes stand out. Real User Monitoring shows how visitors experience your pages. Lighthouse shows which scripts and requests changed, and pull request reviews catch a regression before it ships.
Does Calibre RUM use cookies?
No. Calibre RUM uses no cookies or localStorage and stores no personal data. A random session ID lives in sessionStorage and is removed when the tab closes. You can also leave out visitors from the EU and EEA with one setting.
How does Calibre’s pricing compare with RUMvision’s?
Calibre starts at €65 a month with Real User Monitoring, CrUX data and Lighthouse tests included, for unlimited Sites. RUMvision starts at €150 a month for 2 domains. Calibre counts Real User Monitoring by sessions, not page views, so a visitor who browses ten pages in one tab counts once.
Can I automate Calibre?
Yes. Every plan includes the CLI, the Node.js API and the GraphQL API, so you can run tests from CI, manage Sites and pull data into your own reports. The Calibre MCP server lets Claude Code, Cursor and other coding agents read your monitoring data.
How do I switch from RUMvision 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 RUMvision’s, and connect Slack for alerts. Or book a setup call and we’ll do it with you.
Can I try Calibre before switching?
Yes. Start a free 15-day trial, no credit card required, and run Calibre alongside RUMvision while you decide. Synthetic results will differ a little, since each tool tests from its own locations and devices.
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.
