Letter AI
YC S23Chicago, US · Founded 2023 · 12 employees · Hiring · 8 known investors
Letter AI provides an AI-native revenue enablement platform for sales and GTM teams, delivering personalized content, training, coaching, and buyer engagement tools. The platform combines generative AI with company-specific data to help revenue teams improve deal cycles and win rates.
Also known as Tractatus AI
AI & Machine LearningEnterprise SoftwareFuture of WorkSaaSSales TechUnited States of AmericaAmerica / CanadaPartly Remote
Founders & leadership· Y Combinator alumni (S23)
Letter AI was founded in 2023 by Ali Akhtar and Armen Forget.
AA
Ali AkhtarinFounder & CEOAli Akhtar held roles including VP of ML Products at project44, ML Engineering Director at Samsara, and worked as an AI consultant at McKinsey, bringing over a decade of experience in artificial intelligence and enterprise software.
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Armen ForgetinCo-Founder & CTOSoftware engineer with experience in military and aerospace, followed by work in distributed systems and ML operations, now building generative AI tools for enterprise customers.
Investors · 8
Battery VenturesBoston · $500K – $100M
Formus Capital
Stage 2 CapitalLincoln · $200K – $4M
Y CombinatorSan Francisco · $500K
Lightbankreported · 2 sourcesChicago · $500K – $5M
Also in the syndicate · 3
FormusMangustaNorthwestern Mutual Future Ventures
Funding
SEC filings, press & company announcements$50.6M disclosed across 2 of 3 rounds · 2025–2026
- $40MSeries BFeb 2026 · 2 sources
Battery Ventures (lead), Lightbank, Northwestern Mutual Future Ventures, Stage 2 Capital, Y Combinator
Source ↗ - $10.6MSeries AOct 2025 · 2 sources
Stage 2 Capital (lead), Formus, Lightbank, Mangusta, Northwestern Mutual Future Ventures, Y Combinator
Source ↗
Source: company announcements and press reports — follow each round's link for the claim.
Images
Competitors · 4
by search overlap
Grammarly62 shared keywordsGrammarly is an AI-powered writing assistant that helps users write with clarity and confidence across over 1 million apps and websites. The platform serves professionals, students, and teams through free and premium versions, and uses natural language processing to refine tone, suggest rewrites, and improve communication effectiveness.
Quillbot60 shared keywordsQuillBot provides an AI-powered workspace with tools for writing, paraphrasing, design, and visual generation, letting users brainstorm, research, and produce documents and presentations. It serves writers, students, educators, and professionals for tasks such as content creation, resumes, briefs, and reports.
Canva56 shared keywordsDesign platform; Blackbird invested when it was just an idea and in every round since.
Simplified50 shared keywordsSimplified offers Riley, an AI marketing assistant that plans, creates, publishes, and reports on marketing content, with the user approving work before it ships. It targets founders and lean teams who want to run marketing without hiring a dedicated team.
Companies competing with Letter AI for the same Google search keywords, organic and paid, via search-intersection analysis.
In the news
Frequently asked questions
- What does Letter AI do?
- Letter AI provides an AI-native revenue enablement platform for sales and GTM teams, delivering personalized content, training, coaching, and buyer engagement tools. The platform combines generative AI with company-specific data to help revenue teams improve deal cycles and win rates.
- Who founded Letter AI?
- Letter AI was founded by Ali Akhtar, Armen Forget in 2023.
- Who are Letter AI's investors?
- Letter AI's investors include Battery Ventures, Formus Capital, Stage 2 Capital, Y Combinator, Lightbank.
- How much funding has Letter AI raised?
- Letter AI has disclosed $50.6M raised across 2 of its 3 known rounds.
- Where is Letter AI headquartered?
- Letter AI is headquartered in Chicago, US.