Functional Software, Inc. (Sentry)

Sentry is an application monitoring tool that captures errors, crashes and slow transactions from web, mobile and backend apps and links them to the responsible code and release. Developers use it for error tracking, tracing, session replay, logs and uptime checks. A free Developer plan covers one user with monthly event limits.

Key features

• Error and crash tracking
• Distributed tracing
• Session replay
• Release health
• Uptime and cron monitoring
• AI-assisted debugging (paid)

Pricing

Sentry has a free plan and paid plans start at $26/month (billed annually). Prices checked on the official pricing page in October 2026 and may change.

Who it's for

Sentry is used by developers, startups, SMBs and enterprises.