What is Coder used for?

Coder is a self-hosted platform for cloud development environments and AI coding agents, with workspaces defined in Terraform. It is a good fit for onboarding developers in minutes and running AI coding agents without exposing credentials.

Is Coder open source?

Yes. Coder is open source under the AGPL-3.0 licence. Its source code is on GitHub at coder/coder and is written mainly in Go.

Yes. Coder is open source, so the software itself is free to use.

Can I self-host Coder?

Yes. Coder can be self-hosted on your own server or infrastructure.

What is Coder an alternative to?

Coder is an open-source alternative to CodeSandbox, StackBlitz, GitHub Codespaces and Ona. Other open-source alternatives to CodeSandbox include code-server.

Is Coder actively maintained?

Yes. The most recent commit to Coder was on 2 October 2026, and the latest release is v2.36.6, published on 18 September 2026. The project has 17k stars on GitHub.

Coder: open-source alternative to CodeSandbox, StackBlitz

About Coder

Coder is a self-hosted platform for running cloud development environments and AI coding agents on infrastructure you control. Workspaces are defined with Terraform and can be backed by EC2 VMs, Kubernetes pods, Docker containers and similar resources, so developers can start from a prepared environment instead of configuring a local machine.

Workspaces connect through a secure WireGuard tunnel and shut down automatically when idle to save on costs. Developers can use IDEs such as VS Code and JetBrains. Coder Agents runs an AI coding agent whose loop executes in the control plane on your infrastructure, works with models from Anthropic, OpenAI, Google, Bedrock or self-hosted options, and keeps LLM credentials out of workspaces while providing audit logging and cost tracking.

The server can be installed with a script on Linux and macOS or from a Windows binary, and it starts with a built-in database for evaluation. Production use calls for a PostgreSQL database and an external access URL. Coder is written in Go and released under AGPL-3.0, with a paid Premium tier referenced in its documentation.

Key features

Terraform-defined cloud development workspaces
Secure WireGuard connections
Automatic shutdown of idle workspaces
Works with VS Code and JetBrains
AI coding agents running on your infrastructure
Audit logging and model governance

Good fit for

→Onboarding developers in minutes
→Running AI coding agents without exposing credentials

Built with: Go
Tags: remote-development; cloud-ide; terraform; dev-environments; ai-agents; wireguard; self-hosted; golang

Coder: questions and answers

What is Coder used for?: Coder is a self-hosted platform for cloud development environments and AI coding agents, with workspaces defined in Terraform. It is a good fit for onboarding developers in minutes and running AI coding agents without exposing credentials.
Is Coder open source?: Yes. Coder is open source under the AGPL-3.0 licence. Its source code is on GitHub at coder/coder and is written mainly in Go.
Is Coder free?: Yes. Coder is open source, so the software itself is free to use.
Can I self-host Coder?: Yes. Coder can be self-hosted on your own server or infrastructure.
What is Coder an alternative to?: Coder is an open-source alternative to CodeSandbox, StackBlitz, GitHub Codespaces and Ona. Other open-source alternatives to CodeSandbox include code-server.
Is Coder actively maintained?: Yes. The most recent commit to Coder was on 2 October 2026, and the latest release is v2.36.6, published on 18 September 2026. The project has 17k stars on GitHub.