OSI-licensed only · self-hostable
Sentry tracks errors and performance problems across web and mobile apps. Its source is public, but it is licensed under the Functional Source License (FSL-1.1-Apache-2.0), which converts to Apache-2.0 after two years and is not an OSI-approved licence. Teams that need a strictly open-source option look elsewhere.
Every tool below is under an OSI-approved licence (MIT or Apache-2.0), checked against its repository. Bugsink, a self-hosted tool that works with Sentry SDKs, is listed separately because its licence is not OSI-approved.
Licences checked against each repository on November 7, 2026.
Best for: Simple Sentry-compatible error tracking
An open-source error tracking backend built with Django, designed to be used with Sentry client SDKs.
Best for: Full observability on OpenTelemetry
An open-source observability platform built on OpenTelemetry that combines logs, metrics, traces, alerts and dashboards. Content under ee/ and cmd/enterprise/ is separately licensed.
Best for: Sessions, logs and errors on ClickHouse
An open-source observability platform that combines session replays, logs, metrics, traces and errors, built on ClickHouse and OpenTelemetry.
Best for: Self-hosted Airbrake-style errors
A self-hosted service that collects and manages application errors and works with Airbrake's API.
Best for: Session replay, errors and logs
A full-stack, open-source monitoring platform covering error monitoring, session replay, logging and distributed tracing.
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| If you need… | Start with |
|---|---|
| A drop-in error tracker for Sentry SDKs | GlitchTip |
| Errors, logs and traces in one tool | SigNoz |
| Session replay next to errors | HyperDX or Highlight |
| A small, simple error inbox | Errbit |
| The smallest self-hosted footprint | GlitchTip |
Public source code, but under licences the Open Source Initiative doesn't approve. Fine to use; read the terms first.
Self-hosted error tracking that works with Sentry SDKs. Source is public, but the repository licence is PolyForm Shield, which is source-available and not OSI-approved.
Quick answers to common questions
Its source is public, but the licence is the Functional Source License (FSL-1.1-Apache-2.0), which is not OSI-approved. Each version converts to Apache-2.0 two years after release.
GlitchTip is designed for Sentry client SDKs. Other tools use OpenTelemetry or their own SDKs, so check compatibility first.
GlitchTip is the nearest for pure error tracking; SigNoz and HyperDX are better if you want logs and traces too.
Its repository uses the PolyForm Shield licence, which is source-available rather than OSI open source.
SigNoz, HyperDX and Highlight cover traces and metrics. Errbit and GlitchTip focus on errors.
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