A GitHub pull request review app should do more than display the same diff in a second window.
For a small change, GitHub in the browser may be enough. For a large pull request, reviewers often need to follow symbols, inspect surrounding code, keep their place across files, and decide which feedback is worth sending. That is where a dedicated review app can earn its place.
This guide explains what to look for, which tools solve different review problems, and when a native macOS app makes sense.
What is a GitHub PR review app?
A GitHub PR review app is a tool built around reviewing pull requests hosted on GitHub. It usually connects to a repository, shows changed files, lets you inspect the code, and helps you prepare or submit feedback.
Not every app has the same focus. Some run automated checks. Some provide a faster diff viewer. Some bring a local repository and code navigation into the review.
Those are different jobs. Start by asking what slows your reviews down:
- Finding possible bugs across every pull request points to an automated review bot.
- Understanding a large change points to a local review surface with code navigation.
- Writing a focused comment points to on-demand assistance inside the review.
Why GitHub's browser diff is not always enough
GitHub remains the source of truth for pull request discussion, checks, approvals, and merge decisions. But a browser diff can make code understanding harder when a change is large or unfamiliar.
Common friction includes:
- Changed lines appear without all the surrounding code you need.
- Following a type, definition, or call site means opening extra tabs.
- Large diffs make it easy to lose your place.
- Mouse-heavy navigation adds friction to repeated review actions.
- Automatic AI comments add noise when they are not tied to your judgment.
A better app keeps the GitHub workflow but gives you a better surface for reading the code.
Six features to compare in a GitHub PR review app
1. Local workspace context
Look for an app that can work with a local clone or workspace, not just a copied diff.
A local workspace gives you surrounding files, project structure, configuration, generated types, and the current branch context. That matters when a pull request changes an interface, moves business logic, or touches code used in several places.
The local app does not need to replace GitHub. GitHub can stay the place where you publish the final review. The local workspace becomes the place where you do the deeper reading.
2. LSP navigation inside the review
Syntax highlighting shows what code looks like. Language Server Protocol support helps you understand what it connects to.
Useful actions include go-to-definition, find references, symbol search, and type information. They help when you need to answer questions such as:
- Which implementations use this changed interface?
- What callers depend on this function?
- Does this value have a different type than the diff suggests?
- Where is this configuration read at runtime?
For a practical workflow, see code review with LSP.
3. Keyboard-first movement
Reviewers repeat the same actions dozens of times. Open the next file. Move to the next hunk. Expand context. Jump to a symbol. Add a comment. Return to the diff.
Keyboard shortcuts reduce the cost of each move and keep attention on the code. Look for a small, consistent command set rather than a long list that is hard to remember.
A useful test is simple. Open a large pull request and try to review it without reaching for the mouse every few seconds. If the tool makes that easier, the keyboard support is doing real work.
4. Clear review state
A review app should show what you have read, what you skipped, and which comments are still local to your review.
This is important on a large pull request. Without visible state, you either reread files or rely on memory. Both make reviews slower and make missed issues more likely.
5. Comments that stay under reviewer control
Comments should be easy to write, edit, discard, and send at the right time.
Be careful with tools that turn every automated suggestion into a public comment. That can create noise for authors and make reviewers spend time cleaning up feedback they did not intend to send.
6. A clear path back to GitHub
The app should fit the workflow your team already uses. Check how it handles review comments, approvals, requested changes, draft feedback, and the final handoff to GitHub.
A focused reading surface is useful only if the result can move back into the team discussion without unnecessary copying or process changes.
GitHub PR review app versus an AI review bot
These tools are often grouped together, but they solve different problems.
| Need | Useful fit |
|---|---|
| Scan every pull request for possible issues | Automated review bot |
| Understand a large change with repository context | Local review app |
| Investigate one suspicious block | On-demand AI assistance |
| Discuss, approve, and merge the change | GitHub |
You may use more than one. A bot can scan routine changes. A local review app can help a developer reason through the pull requests that need human attention.
When a native macOS app makes sense
A native macOS app makes sense when code review is a daily desktop task and the main cost is context switching.
Look for practical advantages:
- It works naturally with a local workspace clone.
- Keyboard shortcuts cover the whole review flow.
- The diff and code navigation stay in one focused surface.
- The experience feels closer to the editor where you already understand the code.
It is not automatically better than the web. If your reviews are small or mostly administrative, GitHub may be enough. A dedicated app earns its place when the work is understanding the change, not just clicking through its files.
A quick evaluation checklist
Use a pull request that is large enough to be uncomfortable but familiar enough that you can judge the result. Then check whether the app helps you:
- Move through every changed file without losing your place.
- Jump from a changed symbol to its definition and references.
- Inspect local context without opening a pile of extra tabs.
- Track which parts of the review are complete.
- Draft a comment without publishing it automatically.
- Send the final review back through your normal GitHub workflow.
Do not judge the tool only by how quickly it opens the diff. Judge it by whether you can form a better opinion about the code.
Where Relu fits
Relu is a native macOS app for reviewing GitHub pull requests. It combines a keyboard-driven review surface with full LSP navigation on a local workspace clone.
When you want help, its AI agent drafts comments on demand. You decide which drafts are worth keeping. Nothing is posted just because an agent noticed something.
Relu is built for teams that do not need another bot commenting on every pull request. They need a better place to read the code, follow its connections, and make a deliberate review decision.