Built by people who have lived the billing compliance problem
We combine decades of corporate legal operations experience with deep engineering expertise to give legal departments the compliance control they've always needed - but never had.
Outside counsel invoices that don't follow your rules are costing you millions.
Corporate legal departments spend enormous effort negotiating outside counsel billing guidelines - rate structures, task code requirements, block billing rules, expense limits. Then invoices arrive and compliance falls through the cracks.
Manual review is slow, inconsistent, and impossible to scale. The result: non-compliant charges get paid, guidelines go unenforced, and legal spend spirals beyond budget.
42B.ai exists to fix that. We automate invoice compliance review so every line item is checked against your guidelines, every time - without the manual grind.
"Every corporate legal department deserves to know that every invoice actually follows their rules - not just the ones someone had time to check."
40+ combined years across legal operations and enterprise engineering
42B was founded by two operators who spent their careers on opposite sides of the same problem. One spent two decades inside corporate legal departments - managing outside counsel relationships, negotiating billing guidelines, and watching compliance gaps quietly cost companies real money. The other spent two decades building enterprise-grade software, turning messy operational problems into systems that are accurate, auditable, and built to hold up under scrutiny. 42B is what happens when that operational depth and that engineering rigor point at the same invoice: a reviewer that understands how legal departments actually work, and technology dependable enough to trust with every line.
- Corporate Legal Operations
- Outside Counsel Management
- Billing Compliance
- Legal Spend Strategy
- Enterprise Software
- AI / ML Systems
- Scalable Architecture
- Legal Tech
Built on principles, not just features
The beliefs that guide every product decision we make.
Compliance Without Compromise
Every guideline you've negotiated should be enforced on every invoice. No exceptions, no gaps.
Full Transparency
Every flag we raise comes with a clear explanation. You always know exactly why something was caught.
Operational Speed
Review cycles that took days should take minutes. We built 42B.ai to give your team time back.
Ready to enforce your billing guidelines - on every invoice?
See how 42B.ai can give your legal department the compliance control it deserves.