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Herdr, Open-Source Terminal for Running Multiple AI Coding Agents, Raises $6M Seed Backed by Bessemer and Y Combinator

September 11, 2026 at 04:18 EDT

Software Dev & Coding
AI Agents
Funding & M&A

Herdr, an open-source terminal tool that lets developers run several AI coding agents side by side, has raised a $6 million seed round and joined Y Combinator, capping a six-month climb from a solo side project to a funded startup.

September 2026 · Herdr

A Solo Terminal Project Becomes a $6M Startup

Herdr, the open-source tool developers use to run multiple AI coding agents side by side, raised a $6 million seed round led by Bessemer Venture Partners and joined Y Combinator — six months after launch.

$6M

Seed round led by Bessemer Venture Partners

36,500+

GitHub stars at the seed announcement

340,000+

Downloads by early August 2026

21+

AI coding agents recognized natively

GitHub stars at four milestones

Launch to seed round in about six months

New

Mar · launch

10,000+

Jun 29 · HN front page

25,000

Aug 6 · joins Y Combinator

36,500+

Sep 8 · $6M seed round

Who backed the round

Bessemer Venture Partners led; Y Combinator and e2vc joined in.

Lead investor

Bessemer Venture Partners

Also participating

Y Combinator, e2vc

Angel investors

Tobi Lütke (Shopify), Dane Knecht (Cloudflare), Görkem Yurtseven (fal)

What developers like

Mouse-native interface and scrolling, called an upgrade over plain tmux
Persistent SSH sessions that stay reachable from a phone
One sidebar instead of clicking through many terminal tabs

Open questions

Is running many parallel agents worth the added context-switching?
Single-maintainer roots — funding aims to fix the bus-factor risk
Will venture backing eventually push features behind a paid tier?

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