RECENT FUNDING
  1. Recent Funding
  2. Companies
  3. Letterbook

Letterbook

Sales and marketingY Combinator
Latest funding

$500K*

Source: ycombinator.com

Funding history ↓
Website: letterbook.ai.
X: @LetterbookAI · 8 followers.
LinkedIn: letterbook-ai.
Category: Sales and marketing.
Sectors: B2B, Operations, Customer Service, Customer Support, AI.
Based in: San Francisco, United States.
Team: 2 people on the team page.
On Recent Funding since: Sep 28, 2026.

Signals

X account@LetterbookAI · created Mar 4, 2026 (8 months old) · 8 followers
Website registeredJan 22, 2026 (10 months old)

Funding rounds

  1. X account created
  2. Website created
  3. Date unknown
    Round · $500K*
    YY Combinator
    Source: ycombinator.com

Investors

Similar Sales and marketing companies

Sources and API

Every amount links to the page it came from. * Estimated from an accelerator's published standard deal, not a company-specific disclosure. How Recent Funding sources and verifies funding data. The same data as JSON: /api/v1/companies/letterbook (get a free API key).

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