Sentry

Sentry is a San Francisco-based application monitoring and error-tracking company founded in 2012 by David Cramer and Chris Jennings, who built the original tool internally at Disqus to track exceptions in Django applications before open-sourcing it and spinning it out as an independent company. Sentry's platform, marketed as an application-monitoring and debugging tool for developers, gives engineering teams stack traces, breadcrumbs, alerting, release-health tracking, performance tracing, session replay, log management, and AI-assisted debugging (Seer and Autofix) across more than 100 programming languages and frameworks. Milin Desai, a former VMware general manager, took over as CEO from co-founder David Cramer in 2020; Cramer remains with the company as co-founder and CTO.

Sentry has raised a total of $217 million in disclosed venture funding across a 2015 seed round and five priced rounds from Accel, New Enterprise Associates, Bond, and K5 Global, most recently a $90 million Series E in May 2022 that valued the company at $3 billion. The company has used acquisitions to expand beyond error tracking, buying performance-monitoring startup Specto in 2021, code-coverage company Codecov in 2022, and Syntax in 2023, then adding mobile app performance and size-monitoring company Emerge Tools in May 2025. In June 2026 Sentry sold Codecov to Harness, narrowing its portfolio back toward its core observability and debugging product line.