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Greptile vs What The Diff

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Greptile starts at $30, What The Diff at $19. Both have a free tier. Only Greptile ships a public API.

GreptileIndexes the whole repo, then reviews pull requests with cross-file context rather than diff-only context.What The DiffWrites your pull request descriptions from the diff and posts them back to GitHub or GitLab

Side by side

FactGreptileWhat The Diff
CategoryCode Review & QualityCode Review & Quality
Pricing modelFreemiumFreemium
Starts at$30 seat_month$19 month
Public APIYesNo
PlatformsWeb, APIWeb
CompanyGreptile—
Launched2023—
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Greptile

The full-repo index is the difference that matters - it flags cross-file breakage that diff-only reviewers miss entirely. Billing only for developers who actually got a review that month is a fairer meter than flat per-seat. The 50 credits per seat go quickly on an active team, and $1 per extra review is where the real bill forms.

Pros

  • Indexes the whole codebase, so reviews carry cross-file context
  • Learns from the PR comments your team already writes
  • Seats bill only for developers who actually received a review that period
  • GitHub and GitLab plus an MCP server, an API and a self-hosting option

Cons

  • Credit model means an active repo will exceed the 50 included reviews per seat
  • Overage at $1 per review adds up quietly on a busy month
  • Free tier is capped at a single active developer

What The Diff

It removes a small repetitive chore well — PR descriptions and changelogs get written without anyone thinking about it — and the free tier is enough to judge that on real repositories. The catch is a token meter tied to diff size, so a handful of large refactors can drain a month's allowance, and there is only one paid step above free.

Pros

  • Works with both GitHub and GitLab through their APIs
  • Public changelog with a JSON feed for internal consumption
  • Settings to skip CI pull requests, delay drafts and cap token spend
  • Free tier covers roughly ten pull requests a month

Cons

  • Token cost tracks diff size, so spend is hard to predict on large changes
  • One paid tier at $19/month, with no published step up for heavier use
  • Unused tokens expire monthly

Which one fits

Choose Greptile if you need

  • Teams whose bugs come from cross-file coupling rather than local mistakes
  • Enforcing repo-specific conventions through custom rules
  • Orgs that need self-hosted review for code that cannot leave their network

Choose What The Diff if you need

  • Teams whose pull request descriptions are habitually empty or one line long
  • Keeping non-technical stakeholders informed without hand-written release notes
  • Small repositories where the free monthly token budget covers normal flow

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