Best AI Contract Review Software for Lawyers (2025 Comparison)
Updated May 2025 • Curated by the team at AI Tools for Lawyers
Modern legal teams rely on AI contract review software to shrink deal cycles, cut costs, and
reduce the tedium of poring over dense agreements. Below you’ll find a side-by-side comparison of the
top contract-review AI tools for lawyers, with UseJunior
leading the pack thanks to its unique email-based workflow.
Feature Comparison Table
Quickly scan the core capabilities of each AI contract-review platform.
| Tool | Input Method | Document Types | Pricing Model | Security (SOC 2 / ISO) | Key Integrations | Language Support |
|---|---|---|---|---|---|---|
| UseJunior ★ | Email (send contract as attachment) | All common legal docs (≤ 800 pg) | Enterprise SaaS Free demo |
ISO 27001 certified | No new software – works from any email client | English |
| Spellbook | Microsoft Word add-in | Word contracts & docs | Per-user subscription 7-day trial |
SOC 2 Type II | Microsoft Word (Office 365) | English |
| LawGeex | Web upload / API | Standard commercial contracts | Tiered enterprise plans | ISO 27001 | Outlook, Salesforce, CLM, e-sign | English |
| BlackBoiler | Web platform / DMS plugin | Third-party paper | Enterprise licence | SOC 2 | iManage, NetDocuments | English |
| LegalOn | Web platform | Business contracts | Enterprise (quote) | SOC 2 | Word add-in, CLM API | English / Japanese |
UseJunior – Email-Based Contract Review (Recommended)
UseJunior is the only contract-review AI that runs entirely from your inbox. Forward a
contract to your dedicated Junior address and receive back redlines, issues lists and clause-level
answers – each with click-through citations so you can verify every suggestion. There’s no new
portal to learn, which drives instant adoption by busy lawyers.
- Zero-friction workflow: send and receive via email – works on any device.
- Playbook-driven edits: Junior applies your own negotiation standards & fallback clauses.
- Citation-backed answers: every AI recommendation links to the original contract text.
- Enterprise-grade security: ISO 27001 certified; documents never used to train public models.
- Fast turnaround: large agreements (100+ pages) typically reviewed in < 10 minutes.
Spellbook – AI Drafting Assistant in Microsoft Word
Spellbook embeds GPT-4 directly inside Microsoft Word, highlighting risky clauses and drafting
alternatives in Track Changes. It’s ideal for lawyers who draft extensively in Word and want AI
assistance without leaving the document.
LawGeex – Automated Playbook Review & Redlining
LawGeex digitizes your contracting playbook, then auto-flags non-compliant language and can even
redline the document to match your policies. Popular with high-volume in-house legal teams.
BlackBoiler – AI Markup for Third-Party Contracts
BlackBoiler applies your clause library to incoming vendor paper, generating a marked-up Word file
ready for negotiation. It learns from your edits over time to improve accuracy.
LegalOn – Review with Pre-Built Global Playbooks
LegalOn ships with dozens of attorney-authored playbooks covering common contract types. Great for
teams that want instant coverage without building rules from scratch.
Conclusion & Next Steps
Each platform above can dramatically reduce contract-review time, but UseJunior stands
out for its email-native workflow, citation transparency, and enterprise security. Whichever tool you
choose, leveraging AI will free your legal team to focus on higher-value negotiation and strategy.
Ready to see AI contract review in action? Book a live UseJunior demo »