Company research
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Blackletter is an AI-enabled law firm that combines senior lawyers with purpose-built technology to deliver fixed-fee legal services for startups and established businesses.
- Founders
- Jonathan Rosenbluth · co-founder and CEOTank Talks says he was employee number 20 at Cohere, where he led sales, partnerships and business operations before moving into product, and that he previously spent time at McKinsey; he holds a Harvard JD and a degree in history from Harvard University.
- David Stewart · co-founderTank Talks describes David as the frontier-technology member of the founding team and an ex-Cohere leader.
- Avi Brudner · co-founderBlackletter lists Avi Brudner's prior experience as COO of Blue J and his education as a J.D. from Yale Law School.
- Jonathan Rosenbluth · co-founder and CEO
- Business model
- Blackletter sells legal counsel on fixed, quoted-upfront fees with no hourly rates, including listed starting prices for matters such as SAFE/convertible notes, priced seed financings and Series A/B/C financings.
- Customers
- Antidote Health, Mycroft, WindBorne, Ada, Blue J, Testudo, Retina Robotics, Altitude, TwelveLabs, Silmo, Simile, Stealth, Beacon, The General Intelligence Company of New York, Conduit, Adaption, Bespoke Post, Fanatics, Float, ECap Labs, Duet, Vircom, Crux, Weave
WHY IT MATTERS
Blackletter targets the slow, expensive and misaligned billable-hour model by pairing senior lawyers with its proprietary BlackletterOS and fixed, upfront fees. Its 2026 launch, backing from Ripple Ventures, and named customers including WindBorne, Antidote Health, Crux, ECap Labs and Silmo represent a bet that AI-enabled legal workflows can make high-quality counsel faster and more accessible.
Checked against 9 sources today
Sources
Investors
Seed$6M2026-11-091 investor
Lerer Hippeau[ LEAD ]
Also named as backers in company research: Ripple Ventures