AI Tools for Lawyers
Comparison · 6 toolsLawyers & Legal Ops
AI Tools for Lawyers compared
Every tool in our Lawyers & Legal Ops stack, side by side. Ratings, pricing, what each one is genuinely best at — and the picks we'd actually recommend.
Our picks
Best overall
Harvey
8.8/10Paid (firm-level licensing, contact sales)
The GPT-4-class assistant purpose-built for BigLaw research, drafting and due diligence.
Why: Highest overall rating in the Lawyers & Legal Ops stack.
Best on a budget
Harvey
8.8/10Paid (firm-level licensing, contact sales)
The GPT-4-class assistant purpose-built for BigLaw research, drafting and due diligence.
Why: Strongest free or freemium option that still holds up under real workloads.
Best for enterprise
Harvey
8.8/10Paid (firm-level licensing, contact sales)
The GPT-4-class assistant purpose-built for BigLaw research, drafting and due diligence.
Why: Built with SSO, audit trails and procurement-friendly contracts.
The full comparison
Sorted by rating. Every row links straight to the full review.
| Tool | Rating | Pricing | Best for | Not for | Review |
|---|---|---|---|---|---|
Harvey The GPT-4-class assistant purpose-built for BigLaw research, drafting and due diligence. | 8.8/10 | Paid (firm-level licensing, contact sales) | Large law firms and top-tier in-house teams with real matter volume. | Solo practitioners — pricing and deployment are firm-scale. | Read → |
Spellbook Suggests clauses, spots missing provisions and redlines contracts without leaving Microsoft Word. | 8.5/10 | Paid (per-seat, from ~$150/user/mo) | Transactional lawyers and in-house teams living inside Word. | Litigators or teams standardised on Google Docs. | Read → |
Robin AI UK-built contract copilot that reviews, redlines and explains contracts in plain English. | 8.4/10 | Paid (team licensing) | UK in-house legal teams that want to modernise contract review without leaving compliance behind. | Firms needing US-first case law integration. | Read → |
Lexis+ AI Ask legal questions in plain English and get answers grounded in Lexis's UK case law database. | 8.3/10 | Paid (add-on to Lexis+ subscription) | Lawyers who already subscribe to Lexis+ and want to modernise research. | Firms committed to Westlaw or Practical Law. | Read → |
Definely Instantly surfaces defined terms and cross-references so lawyers stop scrolling long contracts. | 8.2/10 | Paid (per-seat) | M&A, finance and complex commercial lawyers who read long-form contracts daily. | Lawyers who only ever work with short-form NDAs. | Read → |
Josef Build client intake bots, self-service tools and document automations without writing code. | 7.9/10 | Paid (team plans) | In-house teams and mid-size firms with repeatable, high-volume workflows. | Bespoke litigation and advisory work. | Read → |
Strengths & trade-offs at a glance
Harvey
8.8/10Pros
- State-of-the-art quality on legal drafting and reasoning tasks.
- Matter-scoped data isolation and enterprise controls.
- Deep design partnerships with firms like A&O and PwC Legal.
Cons
- Opaque pricing; expect a serious commitment.
- Requires a change-management programme to land at partner level.
- Not a drop-in for individual lawyers.
Spellbook
8.5/10Pros
- No new UI to learn — sits inside Word.
- Playbook-aware suggestions that respect firm style.
- Fast NDA and commercial contract turnaround.
Cons
- Microsoft Word only.
- Suggestions still need a lawyer's judgment — trust but verify.
- Per-seat cost adds up for larger teams.
Robin AI
8.4/10Pros
- UK data residency and GDPR posture out of the box.
- Plain-English explanations alongside every redline.
- Human-in-the-loop legal team backstops the AI on complex reviews.
Cons
- Less known outside the UK/EU market.
- Pricing not published; expect enterprise procurement.
- Deep customisation requires vendor involvement.
Lexis+ AI
8.3/10Pros
- Real citations, not hallucinated ones.
- Draft-generation for memos, letters and pleadings.
- Integrated with the Lexis UK library you likely already pay for.
Cons
- Requires an existing Lexis subscription to make sense.
- Coverage strongest in the jurisdictions Lexis already leads in.
- Interface still feels like a legal research tool, not a modern chat.
Definely
8.2/10Pros
- Removes real friction in long contract review.
- AI drafting features layered on the definition/cross-ref foundation.
- UK-founded with strong law-firm adoption.
Cons
- Value scales with contract length — light users won't notice.
- Microsoft Word only.
- Not a full contract lifecycle tool.
Josef
7.9/10Pros
- Genuine no-code — legal ops teams ship without engineering.
- Great for scaling access to legal services internally.
- Chatbots + document automation in one platform.
Cons
- Design work still needs a skilled legal ops lead.
- AI features less advanced than dedicated LLM tools.
- Enterprise integrations require plan uplift.