Application Monitoring & Metrics
bugsnag.com
Free for up to 2,000 errors/month after the initial trial
CatchJS.com
JavaScript error tracking with screenshots and click trails. Free for open-source projects
Semaphr
Free all-in-one kill switch for your mobile apps
Jam
Developer friendly bug reports in one click. Free plan with unlimited jams
Whitespace
– One-click bug reports straight in your browser. Free plan with unlimited recordings for personal use
memfault.com
Cloud device observability and debugging platform. 100 devices free for Nordic, NXP, and Laird devices
exceptionless
Real-time error, feature, log reporting, and more. Free for 3k events per month/1 user. Open source and easy to self-host for unlimited use
sematext.com
Free up to 500 MB/day, seven days retention
logz.io
Free up to 1 GB/day, one day retention
letsmonitor.org
SSL monitoring, free for up to 5 monitors
sumologic.com
Free up to 500 MB/day, seven days retention
sitesure.net
Website and cron monitoring - 2 monitors free