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
LegalOn
4.0 against 4.2
Same job?
Yes
Both are Legal AI tools
Side by side
Compared on
Definely
LegalOn
Our rating
4.0
4.2Better
Starts at
Not listed
$550/mo
Free plan
No
No
Category
Legal AI
Legal AI
Plans
See pricing
From $550/mo
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
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
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
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
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
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
Company
Definely, founded 2020
LegalOn Technologies, 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 LegalOn?
In our reviews Definely scores 4.0 and LegalOn scores 4.2. The better pick depends on the job. Definely: Nearly tripled ARR in a single year, built by two former Freshfields lawyers. LegalOn: Japan's most-adopted contract review AI, now partnered with OpenAI after crossing $65M ARR.
LegalOn
Definely
