Proton – Auto-Fix GitHub PR Code Reviews with AI

TL;DR

TL;DR: Proton is a free GitHub App that watches your pull request reviews and automatically generates code fixes — closing the loop on review comments without manual intervention.

What Is Proton?

Code reviews are essential — but they fracture focus. A reviewer leaves a comment, you context-switch, fix the issue, push, and wait for re-review. Repeat per comment. Proton (proton.codes) is a GitHub App that closes that loop autonomously.

When a pull request receives review comments, Proton analyzes them, generates the appropriate code change, and opens a new PR against your branch with the fix. You review the generated diff, merge when it looks right, and move on.

The product pitch on the site is direct:

Stop wasting hours on code reviews. Ship features faster than ever with immediate feedback resolution.

Proton was covered on Hacker News in mid-2025 as a Show HN launch (news.ycombinator.com/item?id=43835806).

How It Works

The workflow is straightforward:

1. Install the Proton GitHub App on the repositories you want to enable.
2. Open a PR and request review as normal.
3. Proton watches for review comments.
4. Proton generates the code change addressing each comment.
5. Proton opens a new PR targeting your branch with the fix.
6. You review the auto-generated diff, merge if correct.

No configuration, no CI pipeline changes, no custom scripts.

Setup

Step 1: Install the GitHub App

Visit proton.codes and click Install Proton or go directly to the GitHub App page at github.com/apps/proton-app. Select the organizations or user repositories you want Proton to monitor.

That’s the entire setup — no server, no API keys, no credentials to manage.

Step 2: Open a PR as Usual

Push your branch, open a pull request, and request review from your team. Proton activates automatically on any PR in an enabled repository.

Step 3: Receive Auto-Fixes

When review comments come in, Proton processes them and opens a companion PR ([proton] fix: ...) against your branch. Merge that PR to resolve the comment thread.

Key Features

• Auto-generated code fixes — Proton reads review comments and produces the corresponding code change.
• Companion PR workflow — fixes land in a separate PR so you always review before merging.
• GitHub App model — no self-hosted server; install and forget via the GitHub Marketplace.
• Confidential codebase — the site emphasizes secure processing; your code is not used to train models.
• Free tier — the launch announcement led with “for FREE”; a Book a Demo option suggests an enterprise tier for larger teams.

Source and Accuracy Notes

• Project page: proton.codes — verified live July 2026
• GitHub App: github.com/apps/proton-app
• License: not confirmed open-source — GitHub App / closed-source product (verified via site and GitHub App page, no public repo linked)
• HN launch thread: news.ycombinator.com/item?id=43835806 (Show HN, July 2025)

FAQ

Q: Does Proton work with all programming languages? A: Proton infers the language from your codebase. Coverage depends on the AI model’s ability to generate correct fix logic for your stack — verified via the general product description, not specific language docs.

Q: Is my code sent to third-party servers? A: The site states your codebase remains confidential and is not used for training. The specific data processing agreement is on the privacy policy page.

Q: How does Proton handle incorrect auto-fixes? A: Proton opens a standard PR — you review the diff before merging. Incorrect fixes are rejected at the review step, same as any other PR.

Q: Is there a self-hosted version? A: No — Proton is a hosted GitHub App. There is no self-hosted or open-source edition (as of July 2026).

Conclusion

Proton targets the tedious side of code review: the small, mechanical fixes that pile up after a review pass. By automating the fix-generation step, it reduces the feedback loop from hours or days to minutes.

The free tier covers the core workflow. If your team ships frequently and reviews consume noticeable overhead, Proton is worth trying — installation takes under a minute, and it imposes no changes on your existing process.