Sentry

Judgement

What it is

Complete system

What it does

Captures exceptions and crashes from web, mobile and backend apps with stack traces and context, and adds performance tracing and session replay.

Adopt it when

Almost any software team that ships code to users and wants to see errors as they happen, with SDKs for most languages.

Watch out

Event-based pricing can climb on busy apps, and self-hosting the open version is a heavy stack of services.

Ready for

Production-ready

Runs as

Cloud service and self-hosted server

Built with

Python, Django, PostgreSQL, ClickHouse and Kafka

What the license allows

Closed source: you use it under the maker's terms and cannot change or resell the code.

Judged on 2026-11-03 from the maker's description and Wikipedia. The license and age lines are worked out directly.

Compare Sentry

Open-source alternatives to Sentry

1. 1
   Errbit errbit

   The open source error catcher that's Airbrake API compliant :ukraine:

   Complete system Usable You want free self-hosted error tracking for apps that already use Airbrake clients.

   ★ 4.3k MIT Ruby Active, pushed today
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   Exceptionless exceptionless

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   Complete system Production-ready Your apps are mainly .NET and you want error tracking with first-class .NET integration.

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3. 3
   Measure measure-sh

   Measure helps mobile teams monitor and fix crashes, ANRs, bugs, and performance issues. The open source alternative to Firebase Crashlytics.

   Complete system Usable A mobile team wants crash reporting and session timelines on infrastructure it controls.

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4. 4
   Rustrak rustrak

   Ultra-lightweight error tracking server compatible with Sentry SDKs

   Complete system Experimental You want Sentry-compatible error tracking on a small server without self-hosting full Sentry.

   ★ 836 AGPL-3.0 Rust Active, pushed today
5. 5
   Tower mimiquate

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   ★ 200 Apache-2.0 Elixir Active, pushed 13 days ago
6. 6
   Lapse pyaesone17

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   Building block Experimental Not for new projects.

   ★ 174 MIT PHP Quiet, pushed 8 years ago

Other commercial error tracking tools

1. 1
   Bugsnag SmartBear Software

   Unlock performance & error monitoring for your application with BugSnag. Monitor, analyze, and optimize in real time to ensure a seamless user experience.

   Complete system Production-ready Mobile app teams that care about crash-free session rates per release and want an established hosted tool.

   Commercial
2. 2
   Rollbar Rollbar

   Error monitoring for software teams, Resolve to open a tested fix, and Rollbar Lines to work your whole backlog on your own systems. Free plan available.

   Complete system Production-ready A team wants a hosted error tracker focused on errors and deploys rather than full observability, with a free plan to start.

   Commercial
3. 3
   Honeybadger Honeybadger Industries

   Real-time error tracking, APM & logging for your favorite stack. Helps developers find and fix issues faster. Get started for free.

   Complete system Production-ready A small team, especially a Rails shop, wants errors, uptime and job monitoring from one simple vendor.

   Commercial
4. 4
   Raygun Raygun

   Raygun gives you a window into how users are really experiencing your software applications. Detect, diagnose and resolve issues that are affecting end users.

   Complete system Production-ready A team, often on .NET, wants crash reports and real user performance data in one hosted product.

   Commercial

Under it

Every program, Sentry included, runs on a microchip.

How compilers were built, back to punched paper tape