Whitespace

Error logging and uptime monitoring for web developers. Free Small Business subscription for open-source projects.

Error-tracking with Sentry-SDK compatibility. Free for up to 5,000 errors/month, or unlimited use when self-hosted.

Sentry tracks app exceptions in real-time and has a small free plan. Free for 5k errors per month/ 1 user, unrestricted use if self-hosted

Free all-in-one kill switch for your mobile apps.

Exception and error monitoring, free plan with 5,000 errors/month, unlimited users, 30 days retention

Cloud device observability and debugging platform. 100 devices free for Nordic, NXP, and Laird devices.

Developer friendly bug reports in one click. Free plan with unlimited jams.

Exception, uptime, and cron monitoring. Free for small teams and open-source projects (12,000 errors/month).