Freedom251 › Synthetic Monitoring
Calibre RUM
What Calibre RUM is
Calibre RUM collects Core Web Vitals and other user-experience signals from real browser sessions to help teams locate slow pages and UX issues. It ranks pages by traffic and supports grouping by URL sections such as blog, category and product pages. The service can associate 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 lists web and API access, plus integrations including GitHub, Slack, Zapier, Netlify, Render, webhooks, a Node.js API and a command-line interface. Its RUM script uses no cookies, collects no personal data and is described as having minimal performance overhead. Calibre says data is encrypted in transit with TLS and at rest with AES-256; RUM data passes through AWS edge locations before transfer to a central database in the United States. Plans are priced by sessions: Starter is $75 a month, Team is $150 a month, and Company is $1,500 a month paid yearly. There is no free plan, but a 15-day trial is available.
Who it suits
Calibre describes its platform as serving SEOs, agencies, product teams and developers. It may suit teams that need to examine real-session web vitals by page, device, browser, country or deployment.
What it does well
- Ranks pages by traffic volume
- Connects performance signals to page elements
- Filters reports by device, browser and country
- RUM script uses no cookies or personal data
- Offers web and API access
What to know first
- No free plan
- Starter includes 5K real user sessions
- Synthetic monitoring stops when monthly test allocation is exhausted
Limits
Starter includes 5,000 real user sessions, 5,000 synthetic tests per month, and three seats. Team includes 10,000 sessions and 15,000 synthetic tests monthly; Company includes 1,000,000 sessions and 50,000 synthetic tests monthly. When synthetic capacity runs out, monitoring stops until the next billing cycle unless capacity is increased.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Team | $150 / month · 10K real user sessions · 15,000 synthetic tests/month · 10 seats · unlimited sites and teams | $150 a month |
| Company | $1,500 / month (paid yearly) · 1,000,000 real user sessions · 50,000 synthetic tests/month · 50 seats · unlimited sites and teams · invoice payment available | $1,500 a month |
| Starter | $75 / month · 5K real user sessions · 5,000 synthetic tests/month · 3 seats · unlimited sites and URLs · 1 team | $75 a month |
As calibreapp.com lists them, read 4 Oct 2026. The maker's own page has the final word.
Getting started
- Open the Calibre website
- Start the 15-day trial
- Choose a paid plan from Starter, Team, or Company
- Add the RUM script to monitored sites
- Connect optional integrations or API access
- Invite team seats included with your plan
Verdict
Calibre RUM offers page-level real-user performance signals and several report filters, with plans priced by sessions. Check session and synthetic-test allocations when choosing a plan.
Questions
How much does Calibre RUM cost?
Starter is $75 per month, Team is $150 per month, and Company is $1,500 per month paid yearly.
Is there a free plan or trial?
There is no free plan. A 15-day trial is available.
Which platforms does Calibre RUM support?
It is available through web and API platforms.
Does it monitor mobile apps?
Mobile app monitoring is not supported.
Which integrations are available?
Listed options include GitHub, Slack, Zapier, Netlify, Render, webhooks, a Node.js API, and a command-line interface.
How long is data retained?
Data retention is listed as 90 or more days.
Facts from Calibre RUM's own pages
- Audience
- Calibre describes its platform as serving SEOs, agencies, product teams, and developers. · calibreapp.com, 4 Oct 2026
- Company
- Calibre says it has been bootstrapped and profitable since its founding in 2017. · calibreapp.com, 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. · calibreapp.com, 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. · calibreapp.com, 4 Oct 2026
- Element attribution
- RUM identifies elements associated with slow LCP rendering, INP interaction delays, and CLS layout shifts. · calibreapp.com, 4 Oct 2026
- Founded
- 2017 · calibreapp.com, 28 Sept 2026
- Headquarters
- Melbourne, Australia · calibreapp.com, 28 Sept 2026
- Integrations
- Calibre lists integrations including GitHub, Slack, Zapier, Netlify, Render, webhooks, a Node.js API, and a command-line interface. · calibreapp.com, 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. · calibreapp.com, 4 Oct 2026
- Privacy
- The RUM script uses no cookies, collects no personal data, and is described as having minimal performance overhead. · calibreapp.com, 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. · calibreapp.com, 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. · calibreapp.com, 4 Oct 2026
- Segmentation
- Reports can be filtered by page, device, browser, country, deployment, or URL group. · calibreapp.com, 4 Oct 2026
- Support
- The pricing page says every plan includes email support and describes high-priority support as included with the Company plan. · calibreapp.com, 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. · calibreapp.com, 4 Oct 2026
Where Calibre RUM stands on Freedom251
- Synthetic Monitoring#24 of 43
- Real User Monitoring#17 of 29