Open-source Firebase Crashlytics alternatives

Sentry is a debugging platform that helps developers detect, trace and fix problems in their applications. It collects crash reports and errors from running software, groups them into issues, and adds the context needed to understand what happened, alongside performance monitoring for slow requests and transactions.

Integration happens through official SDKs covering web, mobile, desktop, server and game platforms, from JavaScript, Python and PHP to Go, Rust, Java, Kotlin, Swift, Flutter, Unity, Unreal Engine and Godot. The server itself is a Python application built on Django, and topics also mention CSP report collection and application performance monitoring.

Sentry is source available, and its license is listed as 'Other' on GitHub rather than a standard open-source license. It can be run on your own infrastructure, and the company also operates the hosted service at sentry.io. It is used by engineering teams of all sizes as a first stop when something breaks in production.

This repository packages Sentry for self-hosting. It lets organizations run the whole Sentry platform on their own server without paying for the hosted product, and the project describes it as feature-complete but aimed at low-volume deployments and proofs of concept. The entry is listed under the name Develop, taken from the documentation site.

Sentry maintains a minimal setup that works out of the box for simple cases, built on Docker and Docker Compose with a bash-based install and upgrade script. It comes with no guarantees or dedicated support, so users are expected to rely on the community on Discord. For larger installations the repository acts as a blueprint of how Sentry services connect, and the docs cover configuration, upgrades, backup and restore, and production enhancements.

The code is distributed under Sentry's fair-source license rather than a standard open-source one. Documentation also explains the small number of differences between self-hosted and the SaaS version, along with relocation tooling for moving to Sentry's hosted service.

Measure helps mobile teams monitor and fix crashes, ANRs, bugs and performance problems in their apps. It is presented as an open-source alternative to Firebase Crashlytics, with SDKs for Android, iOS, Flutter and React Native so that teams can collect data from the platforms they ship on.

Features include session replays with automatic tracking of clicks, navigation and network calls, crash and ANR reports with screenshots and stack traces, performance traces and spans, bug reports triggered by a device shake, user journeys, network performance views and an app health dashboard. Adaptive capture lets you change data collection settings without releasing an app update, and a Measure Agent lets you investigate issues in natural language from Slack or a coding agent via MCP.

You can sign up to Measure Cloud or self-host it on your own servers. The project is licensed under Apache-2.0 and has a TypeScript codebase on the dashboard side, with Kotlin, Swift and Dart SDK components. It suits mobile development teams who want crash reporting and observability with the option to keep data on infrastructure they control.