Coasts YC Application
Coasts went through Y Combinator in the Fall 2025 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.
- YC batch
- Fall 2025
- Industry
- B2BEngineering, Product and Design
- Team size
- 2
- Status
- Active
- Launched
- 2025
Founders
Jamie SunderlandFounder/CEO
Dan HymanFounder/CTO
What Coasts does
A Coast (containerized host) is a local development runtime. Coasts let you run multiple isolated environments for the same project on one machine. As AI coding agents increasingly work in parallel across git worktrees, developers hit painful conflicts - clashing ports, duplicated databases, and fragile per-branch setup. Coasts solve this by giving each worktree its own fully isolated runtime, so multiple agents can build and test side by side without stepping on each other.
Coasts's YC application, reconstructed
Y Combinator application
Coasts, Fall 2025 batch. The real form questions, answered from public data.
- Founders2
- Company7
- Progress7
- Idea4
- Equity3
- Curious2
- Batch Preference1
Company
Coasts
Localhost service isolation for git worktrees
Coasts is a local development runtime that lets you run multiple isolated environments for the same project on one machine. It solves conflicts like clashing ports, duplicated databases, and messy setup that happen when multiple AI coding agents or developers work in parallel across git worktrees by giving each worktree its own isolated runtime.
We live remotely and don't have a fixed base. After YC, we plan to remain distributed.
We value flexibility and the ability to build without geographic constraints. Being distributed lets us focus on product and users rather than location logistics.
21 more answers in the full application
Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.
Frequently Asked Questions
Is this the real Coasts YC application?
No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Coasts's public data (launch notes, founder backgrounds, product description). It shows how a company like Coasts would present itself to YC, not the text they submitted.
What YC batch was Coasts in?
Coasts was part of the Y Combinator Fall 2025 batch.
Who founded Coasts?
Coasts was founded by Jamie Sunderland, Dan Hyman.
What does Coasts do?
Localhost service isolation and orchestration for git worktrees
How do I read the full reconstructed application?
Create a free Round Funded account. The full 26-answer version of Coasts's application, and every other YC batch, is in YC Insights.
