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LegalOn

Japan's most-adopted contract review AI, now partnered with OpenAI after crossing $65M ARR

4.2 Legal AI
4.2 Very good 4.2
Pre-built attorney playbooks remove setup time other contract review tools require Individual plan at $550 a month is a real cost for solo practitioners
Reviewed by Challenging Voice Editorial · Updated Jul 2026 How we rate
PricingFrom $550/mo
Free planNo
CompanyLegalOn Technologies
PlatformsAPI, Web
CategoryLegal AI
Founded2017
Last reviewedJul 2026

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Overview

LegalOn, founded in 2017 by former corporate attorneys Nozomu Tsunoda and Masataka Ogasawara, built one of Japan's most-adopted AI contract review platforms before expanding into the US market in 2022, using attorney-built playbooks ready to use from day one rather than requiring a firm to build its own review criteria first.

That playbook-first approach scaled fast: LegalOn surpassed 10 billion yen in annual recurring revenue in October 2025, roughly $65 million, and raised a $50 million Series E led by Goldman Sachs Alternatives in July 2025, bringing total funding to $200 million, while also forming a partnership with OpenAI.

An individual plan runs $550 a month with unlimited reviews and full playbook access, while legal teams get per-seat enterprise pricing through a direct sales conversation. For a legal team that wants attorney-built playbooks ready to use immediately rather than building contract review criteria from scratch, LegalOn's pre-built approach addresses that directly.

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
  • Individual plan available at $550 a month with unlimited reviews

Screenshots & demo

Demo video

Screenshots

LegalOn screenshot 1

Pricing

LegalOn is a paid tool, with plans that start at $550/mo.

  • Pricing modelPaid
  • Starting priceFrom $550/mo
  • Free planNo
Visit LegalOn

Pricing is provided as a guide. Check the official site for the latest plans.

Is LegalOn expensive?

LegalOn starts at $550, which is 453% above the Legal AI median of $99.5 a month across the 20 priced tools we list in that category.

The cheapest paid option in Legal AI starts at $5 and the most expensive at $550.

12% of Legal AI tools in the directory offer a free tier, which this one does not.

Compared against every priced listing in Legal AI, recalculated as the catalogue changes. Method and the full market breakdown are in our AI tool pricing study.

Pros & cons

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
  • Published individual pricing gives solo practitioners a clear entry point

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

How it compares

ToolRatingFreeFromBest known for
LegalOn (this tool)4.2No$550/moAttorney-built playbooks ready to use immediately, not built from scratch
Rocket Lawyer3.9No$12.41/moRocket Copilot – attorney-backed AI contract review and insights
Harvey4.4No$333/moDocument review, due diligence, contract analysis, and legal research in one platform
Definely4.0No—AI drafting, editing, and proofreading built for complex negotiated documents

Alternatives to LegalOn

4 tools matched to LegalOn on what they do, their category and their price.

Rocket Lawyer

3.9

Rocket Copilot gives instant, attorney-backed AI insights on any contract you upload – included unlimited on every membership tier, from $12.41/month.

Paid Legal AI
View details Visit
Compare all LegalOn alternatives →

Head to head: LegalOn vs Rocket Lawyer · LegalOn vs Harvey · LegalOn vs Definely · LegalOn vs Ivo

Frequently asked questions

What is LegalOn?
LegalOn is a legal ai tool. Japan's most-adopted contract review AI, now partnered with OpenAI after crossing $65M ARR.
Is LegalOn free?
LegalOn does not offer a free plan; paid pricing starts at $550 per month.
How much does LegalOn cost?
LegalOn starts at $550 per month. See the pricing plans above for full details.
What are the best LegalOn alternatives?
The closest matches in the directory are Rocket Lawyer, Harvey, and Definely, compared side by side above.

Reviews

4.2 Editorial rating No reviews yet

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