Side by side
Checkly vs ObserveOne API Monitoring
Both stand on api monitoring tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APILinuxWeb
Checkly combines uptime monitors, browser-based checks, and scheduled Playwright suites with a code-oriented workflow. The free Hobby plan has monthly run caps; paid plans start with Starter at $24 a month.
Visit Checkly
Free plan APIExtensionSelf-hosted+1
ObserveOne combines configurable API checks with multiple alert destinations, automation interfaces, and self-hosting options. Check the Free plan's interval and saved-check limits, and confirm that cloud check targets are publicly reachable where required.
Visit ObserveOne API MonitoringThe facts
| Checkly | ObserveOne API Monitoring | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Linux, Web | API, Extension, Self-hosted, Web |
| Lowest paid plan | Starter: $24 a month | Starter: $6 a month |
| Plans published | 4 | 4 |
| Maker | Not published | Not published |
| Website | checklyhq.com | observeone.com |
| On api monitoring tools | #2 of 27 | #6 of 27 |
Checkly: what it does well
- Monitors eight listed uptime check types.
- Browser checks simulate user interactions.
- Runs full Playwright suites as scheduled monitors.
- CLI deploys monitors from a terminal.
- Free plan includes API and browser check runs.
What to know first
- Hobby caps API runs at 10,000 monthly.
- Hobby caps Browser Check runs at 1,000 monthly.
- Enterprise pricing is custom and not listed.
- Enterprise-only support includes 24x7 phone escalation.
ObserveOne API Monitoring: what it does well
- Assertions cover status, timing, JSON paths, headers, and body text.
- Checks can run from selected regions with scheduled retries.
- Write-only vault and encrypted storage protect monitoring secrets.
- Alerts include email, chat apps, SMS, and webhooks.
- GitHub and Netlify integrations support automated runs.
What to know first
- Free URL monitors have a two-hour minimum interval.
- Free plan allows one saved check.
- Cloud TCP, UDP, and database targets must be publicly reachable.
- Paid plans start at $6/mo billed annually.
Alternatives to Checkly Alternatives to ObserveOne API Monitoring The whole list