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Letter AI

YC S23

Chicago, US · Founded 2023 · 70 employees · Hiring · 12 known investors

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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 / Canada

Founders & leadership· Y Combinator alumni (S23)

Letter AI was founded in 2023 by Ali Akhtar and Armen Forget.

AAAli Akhtar
Ali AkhtarFounder & 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.
AFArmen Forget
Armen ForgetCo-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 · 12

Formus Capitallisted by Formus Capital

How we know: svpost.com · the VCSheet dataset · Not right? Tell us

Pioneerlisted by PioneerToronto, Ontario

How we know: Y Combinator's founder network · pioneerfund.vc · open dataset · 5k.vc investor directory · Not right? Tell us

Soma Capitallisted by Soma CapitalSacramento · $100K – $300K

How we know: Y Combinator's founder network · somacap.com · Not right? Tell us

Stage 2 Capitallisted by Stage 2 CapitalLincoln · $200K – $4M

How we know: Stage 2 Capital's portfolio page · a partner's Signal profile · funding news · letter.ai · Not right? Tell us

TechNexus Venture Collaborativelisted by TechNexus Venture CollaborativeChicago

How we know: TechNexus Venture Collaborative's portfolio page · Y Combinator's founder network · open dataset · 5k.vc investor directory · Not right? Tell us

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · funding news · letter.ai · open dataset · 5k.vc investor directory · Not right? Tell us

Attack CapitalreportedBrooklyn · $150K

How we know: Y Combinator's founder network · Not right? Tell us

LightbankreportedChicago · $500K – $5M

How we know: funding news · letter.ai · Not right? Tell us

Mangusta CapitalreportedSan Francisco

How we know: letter.ai · Not right? Tell us

Northwestern Mutual AcceleratorreportedMilwaukee

How we know: Y Combinator's founder network · Not right? Tell us

Also in the syndicate · 1

Northwestern Mutual Future Ventures

Funding

SEC filings, press & company announcements

$50.6M disclosed across 2 of 3 rounds · 2025–2026

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

Images

Letter AI photo

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Companies working in the same space as Letter AI.

In the news

Letter AI Raises $40M Series B to Bring Deal-Level Intelligence to Revenue Enablementfinance.yahoo.com · Feb 2026The Next Chapter: Letter AI Raises Series A Funding to Help Revenue Teams Thriveletter.ai · Oct 2025Ushering in a new era of AI-powered revenue accelerationletter.ai · Jun 2024📈 Letter AI - Personalized and up-to-date sales enablement, built 10X faster with AIycombinator.com · Jul 2023

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, Pioneer, Soma Capital, Stage 2 Capital, TechNexus Venture Collaborative, Y Combinator, Attack Capital and 3 more.
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.