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Theorem

YC X25

San Francisco, US · Founded 2025 · 4 employees · Hiring · 5 known investors

Find your way into Theorem

727 people in our graph share verified history with the Theorem team — schools, employers, funds. One of them is your warm intro.

Tsendai Chagwederaunlockedknows Jason Gross · together at Massachusetts Institute of Technology (overlapped)
×11knows the team · via Massachusetts Institute of Technology

Theorem.dev provides verified software engineering through lf-lean, an AI-powered translation tool that converts formal mathematical proofs from Rocq to Lean significantly faster than manual translation.

Also known as Aletheia

AI & Machine LearningDeveloper ToolsEnterprise SoftwareMachine LearningUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (X25)

Theorem was founded in 2025 by Jason Gross and Rajashree Agrawal.

JGJason Gross
Jason Grossin𝕏Co-FounderJason Gross worked on code infrastructure used by major browsers including Chrome.
RARajashree Agrawal
Rajashree Agrawalin𝕏Co-founderRajashree Agrawal is the founder of Theorem.dev, which provides AI-powered translation tools for converting formal mathematical proofs between proof assistants.

Investors · 5

Y CombinatorSan Francisco · $500K
HalcyonreportedWashington
Khosla Venturesreported · 3 sourcesMenlo Park · $5K – $50M
SAIFreportedBeijing · $10M – $100M

Also in the syndicate · 1

e14

Funding

SEC filings, press & company announcements

Source: company announcements and press reports — follow each round's link for the claim.

Competitors · 4

by search overlap
Workatastartup4 shared keywordsY Combinator's job board where candidates use one profile to apply to roles at YC-backed startups.
3Ds3 shared keywordsDassault Systèmes provides a unified 3D design and simulation platform (3DEXPERIENCE) that enables manufacturing, life sciences, healthcare, and infrastructure companies to create virtual twins of products and systems for innovation and optimization.
Turing3 shared keywordsAGI infrastructure company solving the human intelligence bottleneck and empowering enterprises to harness generative AI.
Traversal3 shared keywordsTraversal builds an agentic AI system that uses machine learning to autonomously analyze telemetry data and troubleshoot production incidents for enterprise software teams. The platform leverages causal machine learning and reinforcement learning to enable self-healing software and improve site reliability.

Companies competing with Theorem for the same Google search keywords, organic and paid, via search-intersection analysis.

In the news

Theorem wants to stop AI-written bugs before they ship — and just raised $6M to do it | VentureBeatventurebeat.com · Jan 2026Theorem Secures $6 Million Seed Funding Led by Khosla Ventures to Fix the Reliability Problem in AI Coding | Radical Data Scienceradicaldatascience.wordpress.com · Jan 2026Theorem – AI coding that is trustworthy-by-defaultycombinator.com · May 2025Theorem Funding Trust comes to market with $292.6 million in ABS | Asset Securitization Reportasreport.americanbanker.com · Jan 2022

Frequently asked questions

What does Theorem do?
Theorem.dev provides verified software engineering through lf-lean, an AI-powered translation tool that converts formal mathematical proofs from Rocq to Lean significantly faster than manual translation.
Who founded Theorem?
Theorem was founded by Jason Gross, Rajashree Agrawal in 2025.
Who are Theorem's investors?
Theorem's investors include Y Combinator, Halcyon, Khosla Ventures, SAIF.
Where is Theorem headquartered?
Theorem is headquartered in San Francisco, US.