Theorem
YC X25San Francisco, US · Founded 2025 · 4 employees · Hiring · 5 known investors
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.
JG
Jason Grossin𝕏Co-FounderJason Gross worked on code infrastructure used by major browsers including Chrome.
RA
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 · 2 sourcesMenlo Park · $5K – $50M
SAIFreportedBeijing · $10M – $100M
Also in the syndicate · 1
e14
Funding
SEC filings, press & company announcements- Undisclosed amountseed fundingJan 2026
Khosla Ventures (lead), e14, Halcyon, SAIF, YC
Source ↗
Source: company announcements and press reports — follow each round's link for the claim.
Competitors · 3
by search overlap3Ds3 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 Secures $6 Million Seed Funding Led by Khosla Ventures to Fix the Reliability Problem in AI Coding | Radical Data Scienceradicaldatascience.wordpress.com · Jan 2026Frequently 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.