Sentry is a software company based in San Francisco, founded in 2011. It offers a developer-first platform for application monitoring, error tracking, and performance observability. The platform is utilized by over 4 million developers and more than 90,000 organizations worldwide, including notable clients like Disney, Slack, and Eventbrite. Sentry's core products include Error Monitoring, Performance Monitoring, Session Replay, Cron Monitoring, and Code Coverage, supporting over 100 programming languages through open-source SDKs. The company operates a hybrid model that combines free open-source software with a scalable cloud-hosted enterprise service. With a valuation of $3 billion following Series E funding, Sentry continues to enhance its offerings to help developers optimize their applications and improve performance.