Airbrake
airbrake.ioError Tracking
One of the original error monitors, now under LogicMonitor — agentless setup that's still dead simple to wire up.
Other products from Error Tracking
The default choice for a reason — open-source roots, huge SDK coverage, and the tracker everything else gets compared to.
SmartBear's stability-score angle is genuinely useful for deciding whether a release is safe to keep out in the wild.
Solid error grouping and deploy tracking, plus an AI agent that drafts the fix PR instead of just paging someone.
Built by a small team for small teams — errors, uptime, and logs in one flat-priced tool without enterprise bloat.