Manifest OS
AI-native law firm OS — powers Manifest Law's fixed-fee, AI-augmented legal practice. $60M Series A at $750M val (Apr 2026, Menlo + Kleiner Perkins).
Overview
Manifest OS: AI-Native Law Firm Operating System
Manifest OS is the operating system powering Manifest Law — the world's first AI-native law firm model. Lawyers join Manifest Law (an affiliated law firm), and Manifest OS provides the AI-augmented workflow tools, knowledge systems, and operational backbone that let them charge fixed fees instead of billable hours while delivering higher-caliber, more consistent legal work.
April 2026: $60M Series A at a $750M valuation — the largest Series A in legal tech history — led by Menlo Ventures with Kleiner Perkins, First Round, and Quiet Capital. Starting with immigration law (100+ attorneys, 15% above-average visa approval rate), expanding to tax next.
Key Features
- AI-native law firm OS — replaces billable-hour model with fixed-fee
- AI-augmented legal workflows: drafting, research, case mgmt
- Lawyers earn 2x prior income while serving more clients
- Knowledge systems learn from every prior case
- $60M Series A at $750M val (Apr 2026) — record legal AI round
Ideal Use Case
Lawyers tired of billable-hour models who want to practice law with AI augmentation under a fixed-fee, outcomes-based system. Also relevant for clients seeking predictable legal pricing.
Why Use Manifest OS
Most legal AI sells software to existing law firms. Manifest OS is the OS and the firm — it controls the entire stack and aligns incentives around outcomes, not hours. The $750M val signals the market believes this re-architects how legal services are delivered.
FAQ
Q: Is this software or a law firm? A: Both — Manifest OS is the software platform; Manifest Law is the affiliated AI-native law firm using it.
Q: Pricing model? A: Fixed-fee or outcomes-based — replacing billable hours.
Q: What practice areas? A: Immigration today (100+ attorneys), tax law next, expanding from there.
tl;dr
AI-native law firm OS. Fixed-fee model replacing billable hours. $60M Series A at $750M val — record legal AI round.
Related
Looking for more options? Browse the Legal Assistant directory or read our best AI legal tools listicle. Manifest OS is also tracked on Crunchbase.
Why Use Manifest OS
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