How Much Does Contract Review Software Cost in 2026
AI contract review software costs $75 to $250 per seat per month in 2026, with enterprise tools running $20K+ a year. Spellbook at $150 is the price anchor for firms that draft and review.
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Spellbook
Pay $75 a month on goHeather if you are a solo doing review only. Pay $150 a month per seat on Spellbook if you draft as well as review, which is the price most firms should anchor to. Pay $199 a month on LegalFly if on-device anonymization is a hard requirement from your data-protection position. Above roughly $400 per seat per month you are in enterprise procurement territory, which almost no firm below the AmLaw 200 line needs.
Try SpellbookAt a Glance
| Feature | goHeather | Spellbook | LegalFly | Definely |
|---|---|---|---|---|
| Price | $75 per seat / month | From $150 per seat / month | Tiered, from $199 / month | Enterprise, custom quote |
| Monthly Price | - | - | - | - |
| Scope | - | - | - | - |
| Buying Motion | - | - | - | - |
| Best For | - | - | - | - |
Quick Comparison
Our Top Picks
goHeather
The floor of professional legal AI pricing. Review-only, aimed at solos and lean in-house counsel.
- Lowest credible entry price in the category
- Monthly billing, no procurement cycle
- Covers the common employment, vendor, and SaaS agreements
- Review only, no drafting included
- Not built for multi-document M&A data rooms
Spellbook
The price anchor for the category. Drafting plus review inside Microsoft Word on one license.
- Drafting and review on a single license
- Native Word plugin, no second app in the workflow
- Predictable per-seat price that partners approve without a committee
- SOC 2 Type II clears most procurement without custom terms
- Per-seat pricing scales linearly, no volume break until enterprise
- API-edge anonymization rather than on-device
LegalFly
The premium for on-device anonymization. Review-only at a higher entry tier than Spellbook.
- On-device anonymization satisfies strict data-residency positions
- Pre-built playbooks for NDAs, MSAs, and DPAs from day one
- Higher entry price than Spellbook for review-only scope
- No drafting, so a full stack means paying for two tools
Definely
0The enterprise tier. Custom pricing that typically lands above $20K a year.
- Best-in-class defined-term cross-referencing
- Enterprise controls and dedicated tenancy
- No published pricing and no self-serve tier
- Overkill below the AmLaw 200 line
How This Was Tested
Pricing reflects public list prices and standard quoted pricing on vendor websites as of August 2026. Per-seat figures assume monthly billing on the entry tier; annual commitments typically discount 10 to 20 percent. Enterprise figures are the ranges vendors quote to firms in the 20 to 100 seat band and vary with document volume and tenancy requirements.
Frequently Asked Questions
AI contract review software costs $75 to $250 per seat per month in 2026 for self-serve tools. goHeather starts at $75 for review only, Spellbook at $150 bundles drafting and review, and LegalFly starts at $199 with on-device anonymization. Enterprise tools like Definely are custom-quoted and typically exceed $20,000 a year.
Yes, at the $75 tier. A solo billing $300 an hour recovers a $75 monthly license the first time the tool saves fifteen minutes. The break-even is low enough that the real question is whether the tool handles your contract types, not whether the price is justified. Drafting tools at $150 need roughly half an hour saved per month to pay back.
The gap reflects what the vendor takes on rather than what the software does. Self-serve tools at $75 to $199 ship standard terms, shared tenancy, and no negotiation. Enterprise quotes above $20,000 a year include dedicated tenancy, custom data-processing terms, procurement support, and named-account service. Firms below the AmLaw 200 line rarely need any of those.
One combined tool, in most cases. A review-only license at $75 plus a drafting tool at $100 or more costs above $175 and forces lawyers to move between two apps. Spellbook at $150 covers both. Splitting the stack only makes sense when a specific requirement, such as on-device anonymization, is only available in a review-only product.
Typically 10 to 20 percent. Pay monthly for the first quarter regardless. Playbook quality and document-type coverage only become clear after a few real matters, and switching after an annual prepayment means eating the balance. Move to annual once the tool has handled a full quarter of your actual contract mix.
Not one built for professional practice. Free tiers exist but cap document counts at levels a real caseload passes in days, and general-purpose AI chatbots lack the legal-specific playbooks that make redlining reliable. The realistic floor for professional use is around $75 a month.