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Coasts

YC F25

Founded 2025 · 2 employees · 1 known investors

Coasts is a local-first, open source tool that enables parallel development environments by spawning isolated runtimes for AI coding agents working with git worktrees. It integrates with any agentic coding solution and supports hybrid local-remote runtime setups.

Also known as JSX Tool

AI & Machine LearningDeveloper ToolsEnterprise SoftwareB2BProductivityDesignWeb Development

Founders & leadership· Y Combinator alumni (F25)

Coasts was founded in 2025 by Jamie Sunderland and Dan Hyman.

JSJamie Sunderland
Jamie SunderlandinFounder/CEOJamie Sunderland previously founded Cheqout, a QR-based ordering platform that reached 250+ restaurants during the pandemic, and worked as a product engineer at Y Combinator building infrastructure before joining the program again as a founder. Prior to that, he was a developer on Airbnb's risk operations team.
DHDan Hyman
Dan HymaninFounder/CTODan Hyman previously worked as a senior engineer focused on cloud and AWS infrastructure, including leading teams on enterprise applications. He also has culinary experience, having worked as a chef at a James Beard award-winning restaurant.

Investors · 1

Y CombinatorSan Francisco · $500K

In the news

JSX Tool: In-Browser React IDEycombinator.com · Nov 2025Infrastructure Law: Climate-Ready Coasts | National Oceanic and Atmospheric Administrationnoaa.gov · Aug 2023Progress for our Ocean and Coasts in the 2023 Federal Budget!surfrider.org · Jan 2023In Early-Stage VC, The Coasts Raise The Mostnews.crunchbase.com · Jan 2019RJMetrics Raises $1.2 Million from Investors On Both Coastsinfo.rjmetrics.com · Jan 2012

Frequently asked questions

What does Coasts do?
Coasts is a local-first, open source tool that enables parallel development environments by spawning isolated runtimes for AI coding agents working with git worktrees. It integrates with any agentic coding solution and supports hybrid local-remote runtime setups.
Who founded Coasts?
Coasts was founded by Jamie Sunderland, Dan Hyman in 2025.
Who are Coasts's investors?
Coasts's investors include Y Combinator.