Crashlytics is not available as a self-hosted solution but there are a few alternatives for power users and business that want to host a solution on-premise. The best Self-Hosted alternative is Sentry, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Crashlytics and four of them are available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting Self-Hosted alternatives to Crashlytics are GlitchTip (Free, Open Source), Bugsnag (Paid) and SessionStack (Freemium).
Bugsnag automatically detects errors in your mobile, front-end, and back-end applications, and provides your team the tools to fix things fast. Bugsnag provides clear insights on the frequency and user impact of each error, so your team can make informed prioritization decisions.