Side by side
Calibre RUM vs Sitewatch
Both stand on synthetic monitoring. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free trial APIWeb
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.
Visit Calibre RUM Free plan Web
Sitewatch combines page-level checks with incident explanations and deployment-triggered checks. Its free plan is limited to one site and page, while paid plans add capacity and faster checks.
Visit SitewatchThe facts
| Calibre RUM | Sitewatch | |
|---|---|---|
| Free plan | A free trial | Yes |
| Open source | Not published | Not published |
| Runs on | API, Web | Web |
| Lowest paid plan | Starter: $75 a month | Starter: $9 a month |
| Plans published | 3 | 3 |
| Maker | Not published | Not published |
| Website | calibreapp.com | getsitewatch.com |
| On synthetic monitoring | #23 of 39 | #18 of 39 |
Calibre RUM: 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
Sitewatch: what it does well
- Checks page content and components, not just server availability
- Incident reports include evidence and tailored fix checklists
- Deploy checks support Vercel, Netlify, GitHub Actions, and webhooks
- Offers alerts through several channels, including SMS
What to know first
- Free plan covers one site and one page per site
- Alert channel availability varies by plan
- Free plan retains data for seven days
Alternatives to Calibre RUM Alternatives to Sitewatch The whole list