Patchlog is a drop-in changelog for web apps. You embed one script tag, with no SDK and no npm install, and get an in-app "what's new" widget plus a hosted changelog page and an RSS feed.

The widget renders inside a Shadow DOM, so it never inherits or leaks the host page's CSS, and it behaves the same in React, Vue, Rails or plain HTML.

Writing the notes is what kills a changelog, not installing one. On Pro, an official GitHub Action sends each push and an LLM turns the buffered commits into draft entries, one per user-facing change, for you to review before anything goes live. Excluded paths such as lockfiles, .env, vendor and build output are stripped on the runner.

Other features: scheduled publishing so you can write updates ahead of time and have them post themselves, per-update view and click analytics, light/dark/auto theming with a custom accent colour on Pro, a read-only REST API over your projects and entries, and 2FA on accounts.

Pricing is flat rather than metered on your traffic: free for 1 project and 25 updates, which shows a small "Powered by Patchlog" badge, or $7/month ($60/year) for unlimited projects and updates, badge removal and advanced analytics. Most tools in this category bill per monthly active user, so the bill grows with your app even though writing release notes does not get harder.

What Patchlog does not do: no user segmentation or targeting, no NPS surveys, no roadmaps or feature voting boards, and no email digests. The API is read only, so you can pull your projects and entries but not create or publish them, and the GitHub drafting is GitHub only and triggers on pushes rather than pull requests or release tags. If you need feedback and a roadmap in the same tool, Beamer or Canny is the better fit.