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Freemium

What The Diff

AI reads your pull request diff and writes the description in plain English – plus weekly change summaries for non-technical stakeholders who'll never open GitHub.

3.5 Coding
3.5 Good 3.5
Removes a genuine, widely-felt friction point (writing PR descriptions) Token-based pricing means heavy PR volume requires a paid tier quickly
Reviewed by Challenging Voice Editorial · Updated Sep 2026 How we rate
PricingFree
Free planYes
CompanyWhat The Diff
PlatformsWeb
CategoryCoding
Last reviewedAug 2026
UpdatedSep 2026

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Overview

What The Diff is an AI-powered code review assistant that analyzes pull request diffs directly through the GitHub or GitLab API and writes a descriptive comment explaining the changes in plain English, without storing the code itself. It also generates simplified summary notifications for non-technical stakeholders and public changelogs with a JSON API option.

Automating the PR description specifically targets a real, widely-felt friction point in software teams – writing a clear, honest PR description is tedious enough that developers often skip it or write something minimal, which then makes code review slower for everyone else. Weekly progress reports rolling up all changes into one digest extends the same idea to keeping non-technical stakeholders informed without anyone manually writing a status update.

What The Diff targets development teams wanting to streamline code review and keep stakeholders informed. Pricing runs on a token model: Free (25,000 tokens/month, ~10 PRs), paid plans starting at $19/month, Pro-200k (priority email support, 200,000 tokens/month, ~40 PRs), and Unlimited at $199/month; unused tokens don’t roll over.

Key features

  • AI-generated plain-English PR descriptions from diff analysis
  • Simplified summaries for non-technical stakeholders
  • Weekly progress reports across all changes
  • Public changelog sharing with JSON API
  • No local code storage – reads via GitHub/GitLab API

Screenshots & demo

What The Diff screenshot 1

Pricing

What The Diff offers a free plan, with paid upgrades for higher limits and more features.

  • Pricing modelFreemium
  • Starting priceFree
  • Free planYes
Visit What The Diff

Pricing is provided as a guide. Check the official site for the latest plans.

Is What The Diff expensive?

What The Diff has no advertised paid tier. Among the 100 priced tools we list in Coding, the median entry price is $20 a month.

64% of Coding tools in the directory offer a free tier, and this is one of them.

Compared against every priced listing in Coding, recalculated as the catalogue changes. Method and the full market breakdown are in our AI tool pricing study.

Pros & cons

Pros

  • Removes a genuine, widely-felt friction point (writing PR descriptions)
  • Free tier covers a meaningful volume (~10 PRs/month) before paying
  • Doesn't store code locally – reads directly via API

Cons

  • Token-based pricing means heavy PR volume requires a paid tier quickly
  • Unused tokens don't roll over between billing cycles
  • AI-written descriptions still benefit from a human sanity check on accuracy

How it compares

ToolRatingFreeFromBest known for
What The Diff (this tool)3.5YesFreeAI-generated plain-English PR descriptions from diff analysis
CodeRabbit4.5Yes$24/moAutomated inline pull request review comments
Hyperlint3.8YesFreeAutomated documentation style-guide enforcement via PR checks
Graphite4.3Yes$20/moStacked pull request workflow tooling

Alternatives to What The Diff

4 tools matched to What The Diff on what they do, their category and their price.

Hyperlint

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CodeMate AI

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CodeMate CORA, an IDE-integrated coding agent, writes, secures, and quality-gates code autonomously – plus a PR Review Agent across GitHub, GitLab, Bitbucket, and Azure DevOps.

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Compare all What The Diff alternatives →

Head to head: What The Diff vs CodeRabbit · What The Diff vs Hyperlint · What The Diff vs Graphite · What The Diff vs CodeMate AI

Frequently asked questions

What is What The Diff?
What The Diff is an AI-powered code review assistant that analyzes pull request diffs directly through the GitHub or GitLab API and writes a descriptive comment explaining the changes in plain English, without storing the code itself.
Is What The Diff free?
Yes, What The Diff offers a free plan. Paid plans unlock more features and higher usage limits.
What are the best What The Diff alternatives?
The closest matches in the directory are CodeRabbit, Hyperlint, and Graphite, compared side by side above.

Reviews

3.5 Editorial rating No reviews yet

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