Warnly review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Warnly is an open-source exception monitoring platform for development teams that want to run error monitoring in their own environment. It accepts events through an HTTP API using the Sentry envelope format, automatically groups related errors into issues, and provides stack traces and event metadata for investigation. Projects can use separate API keys, while teams can manage project access and assign issues. The product is available for web, API, and self-hosted deployments, making it a fit for organizations that prioritize control over their monitoring infrastructure.

Its pricing model is straightforward: Warnly is open source, includes a free plan, and does not offer subscription pricing or usage-based limits. The published deployment model is self-hosted, with Docker Compose supported alongside MySQL and ClickHouse. That combination gives teams a defined path to deployment, but it also means the operational responsibility sits with the organization running the service. Teams looking for a hosted service with vendor-managed infrastructure should choose an alternative.

Warnly’s strongest area is focused error handling. Sentry-compatible clients can send events, related errors are grouped into issues, and real-time alerts help teams respond to failures. Release tracking is included, and OIDC authentication plus Prometheus metrics support integration with existing identity and monitoring environments. Its scope is narrower than a full frontend and application observability platform because frontend monitoring is not included. Choose Warnly for self-hosted teams that need basic exception monitoring, access controls, alerting, and open-source deployment; choose another product if browser-side monitoring is a core requirement.

Warnly pros and cons

• Where it wins
  • Sentry-compatible HTTP ingestion supports existing client workflows
  • Groups related events and provides stack traces with metadata
  • Includes team access control, alerts, OIDC, and Prometheus metrics
• Where it doesn't
  • Self-hosted deployment requires Docker Compose, MySQL, and ClickHouse
  • No frontend monitoring is included
  • Focused on core exception monitoring rather than a broad observability suite

Warnly fact sheet, pricing and score →

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update