GreenBook
Sign in Try Free
Bluebook 21st Ed. · 158 error types

Your citations,
exactly right.

One click. Every error found and fixed. Formatting preserved. Works in Google Docs, Word, and via API.

Add to Google Docs — Free Add to Microsoft Word — Free

No account required to run your first audit · Bluebook 21st Ed.

See it in action

Scroll to watch GreenBook catch a citation error, surface the rule, and apply the correction — automatically.

01Error detected
02Rule identified
03Corrected

Live example — Rule 10.3

…the Court's holding in Chevron was later applied in Smith v. EPA, 467 F.3rdF.3d 1234 (9th Cir. 2006), to require…

Reporter · R-003
"F.3rd" is not a valid Bluebook abbreviation
Rule 10.3 — Third Circuit Reporter
What to use instead
F.3rd → F.3d
"Use the standard abbreviation for the Federal Reporter, Third Series: F.3d"
✓ Corrected Formatting preserved

Catch what you can't see

Before

467 F.3rd 1234 (9th Cir. 2006)

↓ Corrected by GreenBook
After

467 F.3d 1234 (9th Cir. 2006)

Used by law students and attorneys

Found 9 errors in my memo I never would have caught. Reporter abbreviations, spacing — stuff I would have walked into the exam with.

— 1L, University of Michigan Law

The Report convinced my professor I actually checked my citations. She wrote "good citation hygiene" in the margin for the first time.

— 1L, Georgetown University Law Center

We caught fourteen citation errors in a cert petition that had already been through two rounds of review. GreenBook is now mandatory before anything leaves the office.

— Associate Editor, Top-10 Law Review

How it works

Three steps. No setup.

Step 1

Open your document

Open your brief, memo, or motion in Google Docs or Word. GreenBook works inside your existing document — nothing to export or paste.

Step 2

Click "Audit My Document"

GreenBook scans every citation against Bluebook 21st Edition: reporter abbreviations, spacing, pinpoint format, signals, short forms, and 158 more error types.

Step 3

Review corrections. Download the Report.

Corrections appear in Suggesting Mode — accept in one click. Download the GreenBook Report PDF to document your citation review.

Features

Built for Bluebook. Built to ship clean briefs.

158 error types

Full 21st edition coverage: case citations, statutes, regulations, secondary sources, international materials, signals, short forms, and internet citations.

Formatting preserved

Every correction preserves italics on case names and small caps on book titles — guaranteed. Other AI tools drop these. GreenBook doesn't.

The GreenBook Report

A timestamped PDF showing every citation audited, every error found and corrected, and a clean/not-clean status for each. Attach it to your submission.

158

Bluebook error types — complete 21st edition coverage.

<3s

Average audit time for a 40-page brief including footnotes.

3

Platforms: Google Docs, Microsoft Word, and REST API.

Pricing

Free to use. Pro for the Report.

The core audit tool is free, unlimited, and always will be. Pro adds the artifacts that matter for submission and firm use.

Free

$0

No credit card. No trial. Just the tool.

  • Unlimited audit runs
  • Suggesting Mode corrections in Docs and Word
  • Bluebook 21st Edition — full ruleset
  • Formatting preservation on every correction
Add to Google Docs

Pro

$12/mo

Everything in Free, plus the Report.

  • Everything in Free
  • GreenBook Report — timestamped PDF
  • 10-audit citation history
  • Citation reconstruction for ambiguous cites
  • API access
Start Pro — $12/mo

Works where your documents live

No copy-pasting. No new workflow.

Google Docs Add-on Microsoft Word Add-in REST API MCP Server

Start your first audit in 30 seconds.

Install directly from the Google Workspace Marketplace or Microsoft AppSource. No account required to run your first audit.

Add to Google Docs — Free Add to Microsoft Word — Free