Calibre RUM
Calibre RUM is a paid real-user monitoring service for teams that need to locate slow pages and user-experience issues.
What Calibre RUM is
Calibre RUM is a paid real-user monitoring service for teams that need to locate slow pages and user-experience issues. It collects Core Web Vitals and other signals from real browser sessions, then ranks pages by traffic and groups them by URL sections such as blog, category, or product pages. The service connects slow LCP rendering, INP interaction delays, and CLS layout shifts with page elements. Reports can be filtered by page, device, browser, country, deployment, or URL group. Calibre RUM runs on web and API platforms and lists integrations for GitHub, Slack, Zapier, Netlify, Render, webhooks, a Node.js API, and a command-line interface. Its script uses no cookies, collects no personal data, and is described as having minimal performance overhead.
Good
- Tracks Core Web Vitals from real sessions
- Identifies elements linked to LCP, INP, and CLS
- Filters reports by device, country, and deployment
- Provides web and API access
- Offers a 15-day trial
Watch out
- No free plan
- No mobile app monitoring
- Monitoring stops when synthetic allocation is exhausted
- RUM data transfers to a US database
Who it suits
It suits SEOs, agencies, product teams, and developers monitoring website experience. Teams needing Core Web Vitals, geographic breakdowns, and interaction tracking can use its reports.
Verdict
Calibre RUM combines page ranking, element attribution, and detailed segmentation for web performance work. Its paid plans and lack of mobile app monitoring should be considered before choosing it.
Plans and prices
From Calibre RUM's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Starter | $75 a month | 5K real user sessions · 5,000 synthetic tests/month · 3 seats · unlimited sites and URLs · 1 team · $75 / month |
| Team | $150 a month | 10K real user sessions · 15,000 synthetic tests/month · 10 seats · unlimited sites and teams · $150 / month |
| Company | $1,500 a month | 1,000,000 real user sessions · 50,000 synthetic tests/month · 50 seats · unlimited sites and teams · invoice payment available · $1,500 / month (paid yearly) |
The facts
Each one read from Calibre RUM's own pages, with the date it was checked.
What it does
- Audience
- Calibre describes its platform as serving SEOs, agencies, product teams, and developers.checked 4 Oct 2026
- Compliance
- Calibre states that it complies with EU GDPR, UK GDPR, and the Australian Privacy Principles, and acts as a service provider under CCPA for customer data processing.checked 4 Oct 2026
- Data location
- Calibre says RUM data is processed at AWS edge locations and then transferred to its centralised database in the United States.checked 4 Oct 2026
- Element attribution
- RUM identifies elements associated with slow LCP rendering, INP interaction delays, and CLS layout shifts.checked 4 Oct 2026
- Integrations
- Calibre lists integrations including GitHub, Slack, Zapier, Netlify, Render, webhooks, a Node.js API, and a command-line interface.checked 4 Oct 2026
- Page analysis
- RUM ranks pages by traffic volume and lets users group pages by URL sections such as blog, category, and product pages.checked 4 Oct 2026
- Privacy
- The RUM script uses no cookies, collects no personal data, and is described as having minimal performance overhead.checked 4 Oct 2026
- Product
- Calibre RUM collects Core Web Vitals and other user experience signals from real browser sessions to help teams find slow pages and UX issues.checked 4 Oct 2026
- Security
- Calibre says data in transit uses TLS and data at rest is encrypted with AES-256, with encryption keys managed through AWS KMS and automatically rotated.checked 4 Oct 2026
- Segmentation
- Reports can be filtered by page, device, browser, country, deployment, or URL group.checked 4 Oct 2026
- Support
- The pricing page says every plan includes email support and describes high-priority support as included with the Company plan.checked 4 Oct 2026
- Usage limits
- When a plan's monthly synthetic test allocation is exhausted, Calibre says monitoring stops until the next billing cycle unless capacity is increased.checked 4 Oct 2026
The company
- Company
- Calibre says it has been bootstrapped and profitable since its founding in 2017.checked 4 Oct 2026
- Founded
- 2017checked 28 Sep 2026
- Headquarters
- Melbourne, Australiachecked 28 Sep 2026
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