Self-host Klaxon
v0.7.0Website change monitoring for journalists
- Stars
- 683
- Ports
- 3000 (HTTP web server), 5000 (Development server)
- Requires
- PostgreSQL
What is Klaxon?
Klaxon is a free, open-source web monitoring tool built by The Marshall Project's newsroom for journalists and researchers. It lets users bookmark specific sections of web pages and get notified by email, Slack, or Discord when those sections change. The software is designed for newsrooms to track updates on government disclosure logs, court records, and other public web pages. It runs as a Ruby on Rails application with PostgreSQL database and can be deployed on Heroku (with SendGrid for email), via Docker, or on a Linux server using Capistrano. The project includes a browser bookmarklet for selecting page elements to monitor, a web dashboard for managing watched pages and users, and integrations for Slack and Discord webhook notifications. While the original self-hosted version remains open source, the maintainers now recommend a hosted Klaxon Cloud version built into DocumentCloud for individual users.
Should you self-host Klaxon?
Klaxon scores 49/100 on selfhost.directory (how scoring works) and ranks #3 of 3 in News Aggregators. It has 683 GitHub stars.
It shipped 1 stable release in the past year. The latest, v0.7.0, came out on 9 March 2026.
Setup is advanced: plan for several services and some ongoing maintenance. It is MIT-licensed and written mostly in SCSS.
Its closest alternative on selfhost.directory is AIHOT (64/100, 8 786 stars). It scores higher overall, so compare the two before you pick. See Klaxon vs AIHOT side by side.
Features
- Bookmarklet for easy page selection
- Change History
- Discord Notifications
- Domain-restricted user signup
- Element-level bookmarking
- Email notifications
- Heroku one-click deploy
- Multi-user support
- Scheduled checks
- Slack notifications
- Web Dashboard
- Website change monitoring
Klaxon README
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