Coasts

Coasts is a Y Combinator-backed company that localhost service isolation and orchestration for git worktrees. The company participated in the Fall 2025 batch of Y Combinator.

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 was part of Y Combinator's Fall 2025 cohort, has a team of approximately 2 employees, and is actively operating.