What the Diff vs GitHub Copilot
A detailed comparison to help you choose between What the Diff and GitHub Copilot.
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Verdict: GitHub Copilot wins
GitHub Copilot scores 4.3/5, edging out What the Diff at 3.7/5. Developers already working in the GitHub ecosystem who want AI help in every editor they use plus an agent that opens pull requests.
What the Diff AI code review summaries for GitHub PRs | GitHub Copilot Your AI pair programmer | |
|---|---|---|
| Rating | 3.7 (1 review) | 4.3 (1 review) |
| Pricing Model | freemium | freemium |
| Starting Price | Free tier available | Free tier available |
| Best For | Engineering teams on GitHub or GitLab that want automatic pull request descriptions and stakeholder-friendly summaries without buying a full AI review platform. | Developers already working in the GitHub ecosystem who want AI help in every editor they use plus an agent that opens pull requests. |
| Free Tier | ||
| API Access | ||
| Team Features | ||
| Open Source | ||
| Tags | free tierteam features | free tierteam features |
| Visit What the Diff → | Visit GitHub Copilot → |
What the Diff
Pros
- + PR descriptions were accurate enough in my testing to trust as a first read, and the token math matched the vendor's ~10 PRs per 25k tokens estimate
- + The /wtd inline refactor returned a clean committable patch for a commented line range, and sensibly refused cross-file scope instead of botching it
- + Slack summaries put non-technical teammates in the loop — I watched a simplified description land in a channel for someone who never opens diffs
- + Free tier of 25,000 tokens/month across unlimited repositories with no credit card is a real trial, not a teaser
- + States plainly that it stores neither code nor diffs, and offers a public changelog plus JSON feed for stakeholder updates
Cons
- - Summarization only: it will not catch bugs or flag dangerous changes — "error handling updated" hid a real policy swap in one of my PRs
- - Requires full repository access because GitHub and GitLab have no read-diff-only permission, which blocks stricter security postures
- - Tokens do not roll over and there is no auto-upgrade, so bursty months waste budget while quiet months strand it
- - No support for Bitbucket, Azure DevOps or self-hosted git — the coverage boundary is GitHub and GitLab only
GitHub Copilot
Pros
- + Unmetered code completions and Next Edit Suggestions on every plan — my credit balance never moved during a full day of passively-assisted coding
- + Widest surface coverage in the category: VS Code, Visual Studio, JetBrains, Xcode, github.com, Mobile, Windows Terminal, desktop app and CLI
- + Coding agent works inside GitHub's review loop — assigned issue in, reviewable pull request out, in my testing
- + Free tier is genuine: 2,000 completions/month, Copilot CLI, and free Pro for verified students, teachers and popular OSS maintainers
- + Credits are transparent per model at listed API rates (docs.github.com), with 1,500 total monthly credits on the $10 Pro plan
Cons
- - Fallback to cheaper models when you run out was removed in the 2026-06-01 usage-based transition — credits run out, work stops or you top up
- - Annual Pro/Pro+ subscribers stay on old premium-request pricing until expiry, then drop to Copilot Free unless they actively upgrade
- - In-editor context is narrower than Cursor's repo-indexed agent on large codebases in my experience
- - Requires a GitHub account throughout; no support for GitHub Enterprise Server
- - Some premium models (Claude Fable 5/5.1) retain data by default per the docs, with ZDR access for approved enterprises only through end of 2026
Frequently Asked Questions
Which is better, What the Diff or GitHub Copilot?▼
GitHub Copilot scores higher at 4.3/5 vs 3.7/5 for What the Diff, making it the better-rated option in our comparison.
What is the difference between What the Diff and GitHub Copilot?▼
What the Diff: What the Diff is a GitHub and GitLab app that reads a pull request and writes a plain-English summary of what changed. GitHub Copilot: GitHub Copilot suggests and writes code in the editor and acts as a coding agent on GitHub, reviewing and completing tasks in a repository.
Is What the Diff or GitHub Copilot more affordable?▼
What the Diff starts at €0/mo, GitHub Copilot starts at €0/mo. Check the comparison table above for current pricing.
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