Side by side

Calibre RUM vs Testable Synthetic Monitoring

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.

Calibre RUM

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

Testable offers scheduled checks ranging from basic network monitors to scripted workflows, with diagnostics for failed runs. The free plan has five-minute intervals for its basic checks; paid plans start at $23.17/mo (annual).

Visit Testable Synthetic Monitoring

The facts

	Calibre RUM	Testable Synthetic Monitoring
Free plan	A free trial	Yes
Open source	Not published	Not published
Runs on	API, Web	API, Self-hosted, Web
Lowest paid plan	Starter: $75 a month	Solo: $23.17 a month
Plans published	3	5
Maker	Not published	Not published
Website	calibreapp.com	testable.io
On synthetic monitoring	#23 of 39	#12 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

Testable Synthetic Monitoring: what it does well

Free plan includes 50 monitors and one status page.
Supports browser, API, and scripted-flow checks.
Failed checks can include screenshots, traces, and logs.
Paid plans support one-minute monitoring intervals.

What to know first

Free Ping, Port, and HTTP checks run every five minutes.
Advanced workflows have a 100-run monthly free allowance.
Self-hosted monitoring sources are limited to eligible paid plans.

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