The best AI contract review software is the one that checks contracts against your own standards, works where you already edit, usually Microsoft Word, and shows why it flagged each clause. These tools speed up reading; they don't replace a lawyer on anything important. This page lists ten in no particular order, then covers what to check before you trust one.
Contracts are where small businesses quietly lose. A supplier's terms go unread, an NDA gets signed on a Friday afternoon, and the clause that matters only surfaces when something goes wrong. AI review tools promise to read the fine print in minutes, and they can be a real help, as long as you're clear about what they are.
Here are ten AI contract review tools in no particular order, sorted alphabetically, from free NDA checkers to Word add-ins for law firms and enterprise contract platforms. Each description comes from the tool's own website, re-checked today, and describes what the vendor says the tool does. Nothing on this page is legal advice. If you're drafting your own terms, my guide to what a business contract should include is a useful starting point.
AI contract review tools compared
In the free plan column, Yes means the tool's own site describes a free plan, Trial only means a time-limited trial without an ongoing free version, and No means the site points you to a demo instead.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| ContractKen | AI contract review in Word | Playbook review and redlining inside Word | Trial only |
| Definely | Word contract review suite | Structured review of long, complex contracts | No |
| GenieAI | AI contract review and drafting | Free AI review of contracts and templates | Yes |
| Law Insider | AI contract drafting and review | Redlining backed by a large clause database | Trial only |
| LegalSifter | AI contract redlining in Word | Playbook-based redlines inside Word | Trial only |
| Legartis | Legal AI workspace | Free NDA reviews against a playbook | Yes |
| LexCheck | AI contract review software | Self-serve review with fallback language | Trial only |
| Luminance | Contract intelligence platform | Enterprise-wide contract review and analysis | No |
| Spellbook | AI drafting and review in Word | Review, draft and benchmark clauses in Word | Trial only |
| Wordsmith | AI legal assistant for in-house | Contract review and drafting in Word and Slack | Trial only |
Ten AI tools for reviewing contracts
ContractKen
Best for: Lawyers and legal teams who review and redline contracts in Microsoft Word and want AI that applies their own playbooks and precedents.
Definely
Best for: Law firms and in-house teams on complex contracts in Word who want structured review tools built around defined terms and cross-references.
GenieAI
Best for: Individuals and small teams who want to try AI contract review, redlining and drafting from templates on a free plan first.
Law Insider
Best for: Solo lawyers and contract managers who want AI drafting, review and redlining in Word or the browser with a searchable library of real clauses.
LegalSifter
Best for: In-house teams and law firms that want AI redlines aligned to their own contract playbooks and positions, delivered inside Microsoft Word.
Legartis
Best for: Businesses that want to check NDAs and other contracts against their own company standards, starting with free monthly NDA reviews on one seat.
LexCheck
Best for: Business teams outside legal who review contracts themselves against company standards, with suggested fallback language and little training.
Luminance
Best for: Large legal teams and enterprises that want contract analysis across a whole portfolio and are comfortable buying through a demo.
Spellbook
Best for: Law firms and in-house teams who draft and review contracts in Word and want AI suggestions, benchmarks and playbooks in the same document.
Wordsmith
Best for: In-house legal teams that want AI contract review and drafting in Word and Slack, plus an assistant that answers questions from the business.
A clause the law limits, whatever the contract says
Here's a good example of why a flagged clause isn't the end of the story. Section 2 of the Unfair Contract Terms Act 1977, published on legislation.gov.uk, says a person can't use a contract term or notice to exclude or restrict liability for death or personal injury caused by negligence. For other loss or damage caused by negligence, they can only do so if the term meets the requirement of reasonableness.
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An AI reviewer can spot an exclusion clause and tell you it's there. Whether that clause would hold up depends on the facts, the type of contract and what's reasonable, and that's a question for a qualified lawyer. So treat these tools as a fast, careful first reader that highlights what to ask about, and have a lawyer look at anything with real money, liability or risk attached.
What these tools say they do
- Playbook checks: compare a contract against your own standard positions and flag where it differs.
- Redlining: suggest tracked changes and fallback wording, usually inside Microsoft Word.
- Clause libraries: show how similar clauses are commonly worded so you can compare.
- Portfolio analysis: read many existing contracts at once to find renewal dates or risky terms.
How to trial a contract review tool safely
- Check where your documents are stored and whether they're used to train the vendor's AI.
- Write down your standard positions on the clauses you see most, such as liability, payment terms and termination.
- Run three contracts you've already had reviewed by a lawyer through the tool.
- Compare the tool's flags with the lawyer's notes: what it caught, what it missed and what it got wrong.
- Decide which contract types the tool can triage and which always go straight to a lawyer.
- Keep a record of who approved each final version.
If you hire freelancers, my guide to the clauses a contractor agreement needs is a handy checklist to hold any tool's output against.
Red flags when choosing a contract AI
- No explanation for a flag. You should see which rule or position triggered each suggestion.
- Vague answers on data. Ask plainly where documents live and how long they're kept.
- Promises to replace your lawyer. No reputable tool should claim that.
- No way to set your own standards. Generic checks miss what matters to your business.
Before you sign up to any new tool, legal or not, these steps for researching software before you commit will save you a few headaches.
Do you make AI contract review software? Tool makers can ask to be considered for a featured place on this list.
My plain advice on AI contract review software
If you're a small business owner signing the odd NDA or supplier agreement, a free plan or trial is a sensible way to get a first read and a list of questions. Use it to spot what's unusual, then ask a lawyer about anything that touches liability, money or how you can end the deal. The tool saves you time; it doesn't take responsibility.
If you're a legal team, judge each tool on how well it applies your own playbook, how easily you can see why it flagged a clause, and what happens to your documents. Start with one contract type you see every week and expand only when the results match what your lawyers would have said.
Frequently asked questions
Can AI review a contract?
AI tools can read a contract, flag clauses that differ from your standards and suggest changes. They don't replace a lawyer's judgement on whether a clause is fair or enforceable.
Is AI contract review legal advice?
No. These tools describe themselves as review and drafting aids. For anything important, ask a qualified lawyer to check the contract.
Is there free AI contract review software?
Yes. Some tools describe free plans with limited AI usage or a small number of free NDA reviews each month.
Is it safe to upload contracts to an AI tool?
Check how the vendor stores documents, who can access them and whether your files are used to train their AI before you upload anything confidential.
Do AI contract tools work in Microsoft Word?
Many do. Several tools in this list run as Word add-ins, so suggestions appear as tracked changes in the document you're already editing.
What contracts suit AI review best?
High-volume, fairly standard documents such as NDAs and supplier terms. Complex or unusual deals still need careful human review.
