Open Source Sentry Alternatives for Error Tracking

Quick answer

If you need a true open source Sentry alternative for error tracking, start with GlitchTip. It is open source, Sentry SDK compatible, and can be self-hosted or used as a hosted service.

Telebugs is different. It is not an OSI open-source project. It is commercial software with a one-time license, source provided after purchase, self-hosting, Sentry SDK compatibility, included support, and MCP for AI-assisted debugging.

• Choose open source when the license itself is the requirement.
• Choose source-provided self-hosting when you want to run the app yourself, inspect the code, and keep data on your infrastructure.
• Choose Sentry SDK compatibility when you want to migrate by changing the DSN instead of rewriting app instrumentation.

What "open source Sentry alternative" really means

The phrase mixes several product decisions:

• Open source license. The code is available under an OSI-style open-source license such as MIT, Apache, GPL, or similar.
• Source available. You can read or receive source code, but the license may restrict competition, redistribution, or hosted use.
• Self-hosted. You run the service on your own infrastructure, regardless of whether the product is open source.
• Sentry SDK compatible. Your apps can keep using Sentry SDKs and point their DSN at a different backend.
• Full observability vs error tracking. Some alternatives replace only errors; others also include logs, traces, replay, metrics, uptime, and dashboards.

If your only hard requirement is "I need the license to be open source," the shortlist is different from "I need error data on my own server" or "I need a cheaper Sentry-compatible backend."

Comparison

Option	License / source model	Sentry SDK compatible?	Best fit
GlitchTip	Open source. Its GitLab project lists an MIT license.	Yes. GlitchTip says it is compatible with Sentry client SDKs.	Teams that want a true open-source, Sentry-compatible error tracking and monitoring project.
Self-hosted Sentry	Fair Source for current Sentry code, not OSI open source for the current version.	Yes. It is Sentry.	Teams that need the full Sentry platform on their own infrastructure and can operate the stack.
Errbit	Open source. The GitHub project lists an MIT license.	No. Errbit is Airbrake API compliant, not a Sentry SDK backend.	Ruby/Rails teams that want a classic self-hosted error catcher and are comfortable with its stack.
Open-source observability platforms	Varies by project. Verify the license and edition split.	Usually not a drop-in Sentry SDK backend.	Teams that want logs, traces, metrics, session replay, or OpenTelemetry more than a focused Sentry-style error tracker.
Bugsink	Source-available under PolyForm Shield, with a noncompete restriction.	Yes. Bugsink says existing Sentry SDKs can point at Bugsink by updating the DSN.	Teams that want a Sentry-compatible, source-available, self-hosted or hosted option.
Telebugs	Commercial software. Source is provided after purchase under the Telebugs license.	Yes. Change the DSN and keep your Sentry SDK setup for error tracking.	Teams that want self-hosted error tracking, source access, one-time pricing, included support, and MCP.

Where Telebugs fits

Telebugs should not be described as an open source Sentry alternative. The honest category is: a source-provided, self-hosted, Sentry SDK compatible error tracker with a commercial one-time license.

That still solves many of the practical reasons teams search for open source:

• You can self-host it. Error data lands on your server, not in a hosted error-tracking SaaS.
• You receive source after purchase. You are not limited to a black-box binary.
• You avoid usage billing. Telebugs is a one-time purchase, not per-event SaaS pricing.
• You keep Sentry SDKs. Migration is usually changing the DSN, not rewriting instrumentation.
• You get MCP. Authorized AI coding tools can inspect structured error context from your Telebugs server.

If your team values open-source licensing above everything else, Telebugs is not the right answer. If your real goal is owning the error tracker, keeping data close, and avoiding a large self-hosted Sentry stack, Telebugs belongs on the shortlist.

How to evaluate open source Sentry alternatives

1. Read the actual license. "Open source," "Fair Source," and "source available" are not the same thing.
2. Test Sentry SDK compatibility. Send a real exception from your app and verify stack traces, breadcrumbs, tags, releases, and user context.
3. Count the services. PostgreSQL, Redis, MongoDB, ClickHouse, workers, queues, object storage, and cron jobs all become your responsibility when self-hosting.
4. Check maintenance activity. A permissive license is useful, but production error tracking also needs active fixes and security updates.
5. Decide whether you need observability or error tracking. A full monitoring platform can be powerful, but it may be too much if you only need production exceptions.
6. Price support honestly. Free software can still cost engineering time, infrastructure, and incident stress.

Related comparisons

• Error tracking alternatives for the broader comparison hub.
• Sentry alternative for hosted Sentry comparison.
• Self-hosted Sentry alternative for the operational comparison.
• GlitchTip alternative for a focused open-source Sentry-compatible comparison.
• Telebugs vs Bugsink for source-available Sentry-compatible error tracking.
• MCP for self-hosted error tracking for AI-friendly debugging workflows.

Frequently asked questions

What is the best open source Sentry alternative?

If you need a true open-source, Sentry-compatible error tracking tool, GlitchTip is the most direct place to start. If you need source access and self-hosting more than open-source licensing, compare Telebugs, Bugsink, and self-hosted Sentry too.

Is Telebugs open source?

No. Telebugs is commercial software. You receive the source after purchase and can modify it for your own use under the Telebugs license, but it is not an OSI open-source project.

Is self-hosted Sentry open source?

Sentry documents its current license model as Fair Source rather than OSI open source for current code. The self-hosted package is available to run, but it is not the same thing as a fully open-source Sentry fork.

Can open source Sentry alternatives use Sentry SDKs?

Some can. GlitchTip is Sentry SDK compatible. Errbit is not a Sentry SDK backend; it is Airbrake API compliant. Always test a real event before assuming drop-in compatibility.

What is the difference between open source and source available?

Open source usually means the license grants broad rights to use, modify, and redistribute. Source available means the code can be read or obtained, but the license may include restrictions such as noncompete clauses or limits on redistribution.

Does Telebugs support AI debugging?

Yes. Telebugs supports MCP, so approved AI coding tools can inspect structured error context from your Telebugs server after authorization.

Want source access and self-hosted error tracking without running a large observability stack?

Review self-hosted error tracking, compare Telebugs vs GlitchTip, or get Telebugs and run it on your own server.