Freedom251 › Container Development Environments
Coasts
What Coasts is
Coasts runs separate development environments for the same project, allowing work on Git worktrees to use distinct ports, networks and services on one machine. Environments can share selected resources, including services and volumes, or isolate data for services such as databases and caches. Running environments receive dynamic ports, while the checked-out environment uses the project's canonical ports. Coasts supports Docker Compose and non-containerized local setups, and works with agentic coding workflows without special harness-side configuration. Its documentation lists Codex, Claude Code, Cursor, Conductor, T3 Code and Shep. It can also run services on SSH-reachable remote machines alongside local environments. The project describes itself as free, open source under the MIT license, and offline-first, without a hosted service dependency. It runs on macOS and Linux and requires Docker, Git, Node.js and socat. On Linux, canonical ports below 1024 may need host configuration before checkout can bind them.
Who it suits
Coasts suits developers who need separate environments for parallel work on a project, especially those using Git worktrees. It also fits teams combining local development with SSH-reachable machines.
What it does well
- Supports Docker Compose and non-containerized setups.
- Can combine local and SSH-based remote runtimes.
- MIT-licensed, free and open source.
- No hosted service dependency is required.
What to know first
- Requires Docker, Git, Node.js and socat.
- Runs on macOS and Linux only.
- Linux ports below 1024 may need host configuration.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Coasts | Free, local, open source; no usage limits stated | Free |
| Custom team services | Custom local configurations · cloud deployments · infrastructure support | On request |
As coasts.dev lists them, read 10 Oct 2026. The maker's own page has the final word.
Getting started
- Visit https://coasts.dev/.
- Use a macOS or Linux machine with Docker, Git, Node.js, and socat installed.
- Set up a Git worktree-based workflow or a supported local development project.
- Use Docker Compose or a non-containerized setup, then configure resource sharing as needed.
- For remote runtimes, use machines reachable over SSH.
Verdict
Coasts offers isolated local runtimes with configurable sharing and remote-machine options. Check its system requirements and Linux port configuration needs against your development setup.
Questions
How much does Coasts cost?
The Coasts plan is free. It is described as free, local, and open source under the MIT license.
Which operating systems does it support?
Coasts runs on macOS and Linux. It requires Docker, Git, Node.js, and socat.
Does Coasts work with coding harnesses?
Its documentation lists Codex, Claude Code, Cursor, Conductor, T3 Code, and Shep. It says Git worktree-based agentic workflows need no special harness-side configuration.
Can it run projects without Docker containers?
Yes. Coasts supports Docker Compose projects and non-containerized local development setups.
Can Coasts use remote machines?
Yes. Remote Coasts can run on machines reachable over SSH and work alongside local runtimes in a hybrid setup.
What is the Linux port limitation?
Canonical ports below 1024 may require host configuration before checkout can bind them.
Facts from Coasts's own pages
- Harness compatibility
- The docs list support guidance for Codex, Claude Code, Cursor, Conductor, T3 Code, and Shep. · coasts.dev, 10 Oct 2026
- Harnesses
- The documentation lists Codex, Claude Code, Cursor, Conductor, T3 Code and Shep as supported harnesses. · coasts.dev, 9 Oct 2026
- License
- The project is MIT-licensed and described as free and open source. · coasts.dev, 10 Oct 2026
- License and cost
- The project describes itself as free, local and MIT-licensed, with no AI upsells. · coasts.dev, 9 Oct 2026
- Linux limitation
- On Linux, canonical ports below 1024 may require host configuration before checkout can bind them. · coasts.dev, 10 Oct 2026
- Maker
- The site copyright identifies Stanton Street Inc. · coasts.dev, 9 Oct 2026
- Offline use
- The project describes itself as offline-first with no hosted service dependency. · github.com, 10 Oct 2026
- Parallel runtimes
- Each Coast has its own ports, network, and services, with configurable resource sharing. · coasts.dev, 10 Oct 2026
- Platform limitation
- Canonical ports below 1024 on Linux require additional host configuration. · coasts.dev, 9 Oct 2026
- Port mapping
- Each running Coast receives dynamic ports, while only the checked-out Coast uses the project's canonical ports. · coasts.dev, 10 Oct 2026
- Purpose
- Coasts runs multiple isolated local development environments for the same project on one machine. · coasts.dev, 10 Oct 2026
- Remote hardware
- Remote Coasts run services on remote machines through SSH and can be combined with local Coasts in a hybrid setup. · coasts.dev, 10 Oct 2026
- Remote runtimes
- Remote Coasts can run on machines reachable over SSH, allowing local and remote runtimes in a hybrid setup. · coasts.dev, 9 Oct 2026
- Requirements
- The documented requirements are macOS or Linux, Docker, Git, Node.js, and socat. · coasts.dev, 10 Oct 2026
- Runtime support
- Coasts supports Docker Compose stacks and non-containerized local development setups. · coasts.dev, 10 Oct 2026
- Secrets
- Coasts can extract secrets from the host environment and inject them into Coast containers so credentials do not need to be hardcoded in a Coastfile. · coasts.dev, 10 Oct 2026
- Security and hosting
- The project says it is offline-first with no hosted service dependency. · github.com, 9 Oct 2026
- Stack support
- Coasts supports Docker Compose projects and non-containerized local development setups. · coasts.dev, 9 Oct 2026
- Support
- The site links to a Discord community and a contact page. · coasts.dev, 9 Oct 2026
- Team support
- The maker offers setup, onboarding, and ongoing infrastructure help for teams through its contact page. · coasts.dev, 10 Oct 2026
- Volume strategies
- Coasts provides shared services, shared volumes, and per-instance data isolation strategies for services such as databases and caches. · coasts.dev, 10 Oct 2026
- Workflows
- Coasts works with agentic coding workflows that use Git worktrees and says no special harness-side configuration is required. · coasts.dev, 9 Oct 2026
- Worktree runtimes
- Each environment can have its own ports, network and services, with options to share resources across environments. · coasts.dev, 9 Oct 2026
- Worktree workflow
- Coasts works with agentic coding workflows that use Git worktrees and requires no special harness-side configuration. · coasts.dev, 10 Oct 2026