Side by side
Calibre RUM vs OneUptime
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 APILinuxSelf-hosted+1
OneUptime brings service monitoring and incident response together, with both hosted plans and self-hosted deployment options. The free tier has a limited status-page allowance, no uptime SLA, and separate charges for active monitors.
Visit OneUptimeThe facts
| Calibre RUM | OneUptime | |
|---|---|---|
| Free plan | A free trial | Yes |
| Open source | Not published | Not published |
| Runs on | API, Web | API, Linux, Self-hosted, Web |
| Lowest paid plan | Starter: $75 a month | AI LLM Token Usage: $0.02, paid once |
| Plans published | 3 | 10 |
| Maker | Not published | Not published |
| Website | calibreapp.com | oneuptime.com |
| On synthetic monitoring | #23 of 39 | #5 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
OneUptime: what it does well
- Incident management includes on-call rotations and alerts
- Synthetic tests simulate user flows
- Core platform is open source under Apache 2.0
- Self-hosting supports Kubernetes or Docker Compose
What to know first
- Free plan has no uptime SLA
- Free plan includes one status page and 100 subscribers
- Active monitors cost $1 per month each
- Free-plan email support has a five-business-day SLA
Alternatives to Calibre RUM Alternatives to OneUptime The whole list