LegalOn Technologies

LegalOn Technologies is a legal AI company that builds contract-review and legal-workflow software for in-house legal teams. Founded in Tokyo in 2017 by former corporate lawyers Nozomu Tsunoda and Masataka Ogasawara, it pairs large language models with attorney-authored playbooks so its flagship product, Review, flags risks and suggests edits inside Microsoft Word. Used by more than 7,000 organizations across Japan, the U.S. and the U.K. - including roughly a quarter of Japan's public companies - LegalOn raised a $50M Series E led by Goldman Sachs in July 2025 and struck a technology partnership with OpenAI to build legal AI agents.