Based only on the facts in our directory. The right pick still depends on the job you need done.
Lower starting price
Not comparable
Not comparable: Definely does not list a price
Free plan
Tie
Neither has one
Higher rating
Spellbook
4.0 against 4.2
Same job?
Yes
Both are Legal AI tools
Side by side
Compared on
Definely
Spellbook
Our rating
4.0
4.2Better
Starts at
Not listed
Not listed
Free plan
No
No
Category
Legal AI
Legal AI
Plans
See pricing
See pricing
Key features
AI drafting, editing, and proofreading built for complex negotiated documents
Catches defined-term errors and cross-reference mistakes in dense contracts
Nearly tripled annual recurring revenue in 2024
Works with roughly 100 in-house legal teams and law firms
$30M Series B led by Revaia, with legal tech company Clio participating
Drafts contract language and flags risky clauses directly inside Microsoft Word
Purpose-built for transactional contract drafting and negotiation
No separate platform to learn, works inside an existing document editor
$63M total funding including a $50M Series B in October 2025
Originally founded in 2017, rebranded around the Spellbook product in 2022
Pros
Founders' Big Law background shows in a focus on genuinely complex documents
Strong recent revenue growth validates real demand among legal teams
Backed by Clio, a legal tech company with direct category expertise
Works directly inside Microsoft Word, no new platform to adopt
Focused specifically on contract drafting, a clear and narrow job to be done
Recent substantial funding from a top-tier investor
Cons
Pricing isn't published, requires a sales conversation to get a quote
Narrower focus on document precision rather than full contract lifecycle management
Smaller company with less brand recognition than larger legal AI platforms
Narrower scope than full-platform competitors, doesn't cover research or due diligence
Word-native workflow requires a firm already standardized on Microsoft's document tools
Smaller funding scale than Harvey or Legora limits comparable investment pace
Company
Definely, founded 2020
Spellbook, founded 2017
Prices come from each vendor's pricing page, last checked 20260715. Check the vendor before you buy.
FAQ
Questions people ask
Is Definely better than Spellbook?
In our reviews Definely scores 4.0 and Spellbook scores 4.2. The better pick depends on the job. Definely: Nearly tripled ARR in a single year, built by two former Freshfields lawyers. Spellbook: Drafts and redlines contracts directly inside Microsoft Word.
Spellbook
Definely
