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: Spellbook does not list a price
Free plan
Tie
Neither has one
Higher rating
Tie
4.2 against 4.2
Same job?
Yes
Both are Legal AI tools
Side by side
Compared on
LegalOn
Spellbook
Our rating
4.2
4.2
Starts at
$550/mo
Not listed
Free plan
No
No
Category
Legal AI
Legal AI
Plans
From $550/mo
See pricing
Key features
Attorney-built playbooks ready to use immediately, not built from scratch
One of Japan's most-adopted AI contract review platforms before US expansion
Surpassed $65M in annual recurring revenue as of October 2025
$50M Series E led by Goldman Sachs Alternatives, $200M raised total
Partnership with OpenAI announced alongside continued product development
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
Pre-built attorney playbooks remove setup time other contract review tools require
Proven adoption at scale in Japan before expanding into a competitive US market
Strong recent funding and an OpenAI partnership support continued investment
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
Individual plan at $550 a month is a real cost for solo practitioners
Enterprise team pricing requires a sales conversation, not published upfront
Originally built for the Japanese market, still establishing full US-market depth
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
LegalOn Technologies, founded 2017
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 LegalOn better than Spellbook?
In our reviews LegalOn scores 4.2 and Spellbook scores 4.2. The better pick depends on the job. LegalOn: Japan's most-adopted contract review AI, now partnered with OpenAI after crossing $65M ARR. Spellbook: Drafts and redlines contracts directly inside Microsoft Word.
LegalOn
Spellbook
