What is Exceptionless used for?

Exceptionless is a real-time error and event reporting for JavaScript, Node, and .NET applications, available as a hosted service or self-hosted with Docker. It is a good fit for tracking unhandled exceptions in .NET apps and replacing commercial error monitoring tools.

Is Exceptionless open source?

Yes. Exceptionless is open source under the Apache-2.0 licence. Its source code is on GitHub at exceptionless/Exceptionless and is written mainly in C#.

Is Exceptionless free?

Yes. Exceptionless is open source, so the software itself is free to use. A managed cloud version is also available, with paid plans from $15 per month.

Can I self-host Exceptionless?

Yes. Exceptionless can be self-hosted on your own server or infrastructure.

What is Exceptionless an alternative to?

Exceptionless is an open-source alternative to Sentry, Rollbar, Bugsnag and Raygun. Other open-source alternatives to Sentry include Highlight.io, HyperDX and Sentry.

Is Exceptionless actively maintained?

Yes. The most recent commit to Exceptionless was on 2 October 2026, and the latest release is v8.10.0, published on 29 September 2026. The project has 2.5k stars on GitHub.

Exceptionless: open-source alternative to Sentry, Rollbar

About Exceptionless

Exceptionless provides real-time error reporting for JavaScript, Node, .NET Core, ASP.NET, Web API, WebForms, WPF, console, and MVC applications. It gathers exceptions and logs, groups them into simple actionable data, and helps teams fix problems quickly. The name means without exception. It is released under the Apache-2.0 license.

The topics mention error monitoring, crash reporting, logging, bug tracking, Elasticsearch, Redis, and the Foundatio library, which indicate the stack behind the server. The application is written in C# with a JavaScript front end.

You can use the hosted service run by the project, which the maintainers describe as reasonably priced and as a way to support the project, along with setup and support services, or run the server yourself. A single Docker command starts a local instance on port 7110. It suits development teams who want an open-source alternative to commercial error-tracking tools.

Key features

Real-time error and exception reporting
Support for JavaScript, Node, and .NET apps
Grouped, actionable error data
Event logging
Docker one-command local setup
Hosted service or self-hosting

Good fit for

→Tracking unhandled exceptions in .NET apps
→Replacing commercial error monitoring tools

Built with: C#; JavaScript; Redis
Tags: error-monitoring; crash-reporting; logging; dotnet; javascript; exceptions; self-hosted; bug-tracking

Exceptionless: questions and answers

What is Exceptionless used for?: Exceptionless is a real-time error and event reporting for JavaScript, Node, and .NET applications, available as a hosted service or self-hosted with Docker. It is a good fit for tracking unhandled exceptions in .NET apps and replacing commercial error monitoring tools.
Is Exceptionless open source?: Yes. Exceptionless is open source under the Apache-2.0 licence. Its source code is on GitHub at exceptionless/Exceptionless and is written mainly in C#.
Is Exceptionless free?: Yes. Exceptionless is open source, so the software itself is free to use. A managed cloud version is also available, with paid plans from $15 per month.
Can I self-host Exceptionless?: Yes. Exceptionless can be self-hosted on your own server or infrastructure.
What is Exceptionless an alternative to?: Exceptionless is an open-source alternative to Sentry, Rollbar, Bugsnag and Raygun. Other open-source alternatives to Sentry include Highlight.io, HyperDX and Sentry.
Is Exceptionless actively maintained?: Yes. The most recent commit to Exceptionless was on 2 October 2026, and the latest release is v8.10.0, published on 29 September 2026. The project has 2.5k stars on GitHub.