What is LeCHECK?

An AI contract-review support cloud from lawyer-founded Lisse Co., Ltd. Rather than general-purpose generative AI, it is a "legal-specialized AI" based on lawyer-supervised fixed check rules; it detects contract risks with a priority (A/B/C) and presents revision suggestions and clause explanations. Japanese & English, 100+ contract types and 1,300+ templates, plus own-standard review and contract management. Deployed at 5,000+ companies.

Business problems it solves

【Legal / Attorney】

About "LeCHECK"

What is LeCHECK

LeCHECK is an AI contract-review support cloud from Lisse Co., Ltd. The company was founded by a lawyer; upload a contract and the AI detects risks, flags them with a priority (A / B / C), and presents revision suggestions and clause explanations. It supports both Japanese and English contracts, and can review against your own standards and manage contracts. It has been deployed at 5,000+ companies and is supervised by 30+ lawyers.

LeCHECK's risk-check screen. On the left is the body of a non-disclosure agreement; on the right, a "review results" panel lists "revision" and "omission" findings tagged with Priority A (red) and Priority B (yellow)

Source: LeCHECK (Lisse Co., Ltd.) official site

LeCHECK is not a general-purpose generative AI — it is a lawyer-supervised "legal-specialized AI" based on fixed check rules. Rather than guessing like generative AI, it performs grounded checks, which it positions as a strength for suppressing "hallucinations" (the AI stating things that are not true).

Provider

Lisse Co., Ltd. (founded 2018; founded by lawyer Miki Fujita)

Because it's "not generative AI," checks are grounded

LeCHECK's hallmark is that lawyer-supervised fixed rules flag omissions and unfavorable clauses with grounds. Findings carry a priority (A / B / C), with clause explanations grounded in case law and revision suggestions tailored to your position (seller, buyer, etc.). Unlike generative AI that answers by guessing, the basis for each check is clear, which brings peace of mind in legal work.

Features

01See the risks

AI risk check — show risks in three levels: A / B / C
Omission & unfavorable-clause detection — flag missing or unfavorable clauses
Clause explanations — grounded in case law and more

02Fix & research

Revision suggestions — position-specific alternative clauses (Japanese & English)
Templates — 1,300+ lawyer-authored templates
Own-standard review & comparison — check against your own templates/standards

03Manage

Contract management — tagging/storage, deadline alerts, version control
Word add-in — use reviews from within Word

How to use

Upload a contract

Import the contract to review (Japanese or English).
Run the AI risk check

Risks are flagged with a priority (A / B / C).
Review the findings and revise

Fix based on revision suggestions, clause explanations and own-standard checks.
Manage contracts

Manage even post-signing contracts with tags and deadline alerts.

Pricing

Pricing is not disclosed; contact for a quote, with a plan structure of Trial (¥0) / Light / Standard / Professional. There is a free trial to try the AI risk check (as of August 2026).

Pricing model

Not disclosed; contact for a quote (annual contract; setup fee quoted separately)

Free

Free trial (try the AI risk check)

Track record

Deployed at 5,000+ companies and supervised by 30+ specialist lawyers. It is used by major telecom groups, retail platforms, pharmaceutical companies, law firms and more. It holds ISO/IEC 27001 and 27017, and supports encrypted communications, a WAF and IP restrictions (optional).

How LeCHECK differs from other contract-review AIs

Contract-review AIs split into those that foreground generative AI and those that are fixed-rule based. LeCHECK stands out for being lawyer-founded and lawyer-supervised, fixed-rule based, with grounded checks and hallucination suppression.

Aspect	LeCHECK	LegalForce	OLGA
Approach	Fixed check rules (not generative AI)	Lawyer-supervised review	End-to-end (also uses generative-AI Q&A)
Coverage	Japanese, English, own standards	Focused on contract review	From intake to contract management
Positioning	Lawyer-founded; easy even for small legal teams	No.1 in adoption	Legal OS

For contract review specifically, LegalForce; for whole-of-legal-work coverage, OLGA; for case-law/literature research, Legalscape; for foundational tech, Legal Brain. For legal teams that value grounded checks over generative-AI guessing, LeCHECK is a strong choice.

This page is based on information published on the official site as of August 2026. Please check the official site for the latest specs and pricing.