Listed alphabetically. A tool is ranked by its reviews once it has 3.
| Tool | Reviews | Lowest paid plan | Free plan | Free trial | Public API | Runs on | Main features |
|---|---|---|---|---|---|---|---|
 AxiomThe modern machine data platform | ReviewsNone yetWrite one for Axiom | Lowest paid plan$25per month, platform fee + usageAxiom Cloud, as of October 23, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features
|
 Better StackAI SRE observability stack with logs, tracing, error tracking, incidents and status pages | ReviewsNone yetWrite one for Better Stack | Lowest paid plan$34per responder per monthResponder, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs oniOS, Android | Main features
|
 ChecklyThe active reliability layer for developers and agents | ReviewsNone yetWrite one for Checkly | Lowest paid plan$24per month, billed annuallyStarter, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onWeb, CLI | Main features
|
 CronitorStatus, uptime and performance monitoring for agents, cron jobs, websites, APIs, and everything in between. | ReviewsNone yetWrite one for Cronitor | Lowest paid plan$2per monitor per month, plus $5 per user per monthBusiness, as of October 28, 2026 | Free planYes | Free trial14 days | Public APIYes | Runs onNot confirmed | Main features
|
 Grafana CloudMonitor metrics, logs, traces and profiles on a fully managed observability platform | ReviewsNone yetWrite one for Grafana Cloud | Lowest paid plan$19per month, plus usagePro, as of October 19, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features
|
 HoneycombObservability platform for AI-era software with fast queries and unified telemetry | ReviewsNone yetWrite one for Honeycomb | Lowest paid plan$150per month for 50M events, scaling to 750MPro, as of October 19, 2026 | Free planYes | Free trialYes | Public APIYes | Runs onNot confirmed | Main features
|
 New RelicIntelligent Observability resolves issues at scale, before they impact your bottom line | ReviewsNone yetWrite one for New Relic | Lowest paid plan$10per month for the first full platform user, then $99 per additional user, up to 5Standard, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features
|
 RollbarError tracking that ends in a fix | ReviewsNone yetWrite one for Rollbar | Lowest paid plan$9per month at 10,000 occurrences, scaling with volumeEssentials, as of October 20, 2026 | Free planYes | Free trial14 days | Public APIYes | Runs onNot confirmed | Main features
|
 SentryApplication monitoring for developers to see errors clearer and solve issues faster | ReviewsNone yetWrite one for Sentry | Lowest paid plan$26per month, billed annuallyTeam, as of October 19, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onWeb, CLI | Main features
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 UptimeRobotCatch downtime before your users do | ReviewsNone yetWrite one for UptimeRobot | Lowest paid plan$9per month, billed annuallySolo, as of October 23, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onWeb, iOS, Android | Main features
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From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made
A tool is listed here only when we've confirmed on its own website that it has a free plan. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed