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Collie

FreeOpen SourceSelf-HostedAgentic

Most coding agents give you advice. They suggest the fix, sketch the diff, explain the approach — then hand it back to you to actually run it. Collie runs it, checks it passed, and only tells you it's done when it is.

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License: MIT Any use incl. commercial
Local-run terms: Run the provided installers or pip package on your own machine under the MIT license; full local execution with user-provided AI subscription.

Pricing

Model
Free

Summary

Collie is a local, open-source coding agent that operates directly on your machine — your file system, your signed-in browser session, your real terminal. The core loop is: you describe the task in plain language, Collie does the actual work, then writes a verification step and runs it before declaring the job complete. That proof-first model is what separates it from a chat assistant. It installs as a desktop app on Windows and macOS, or via a single pip command on Linux. No telemetry, no cloud relay — your files and credentials stay local.

Bottom line: Pick Collie when you need a local agent that can hit your real browser session and verify its own fixes — but if your work requires calling external APIs, triggering webhooks, or integrating with CI pipelines, you will be wiring those connections yourself.

Find your fit

Before you choose Collie

More options in CLI Coding Agents. Compare pricing, platforms, and features side by side.

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Pros

  • Runs against your real browser session and signed-in accounts, so tasks like pulling data from a portal or filling a form work without re-authentication or credential sharing with a third party.
  • Writes and runs a verification step before calling a task complete, which means you get a passing test as proof of a bug fix rather than a diff you have to validate yourself.
  • No telemetry and no cloud relay — your source code, files, and session credentials stay on your machine, so it fits workflows where data cannot leave the local environment.
  • One-click desktop install on Windows and macOS with no admin rights required, so setup does not block a developer who lacks elevated permissions on a managed machine.
  • MIT-licensed and self-hosted, so you can inspect the source, fork it, or audit what it does — which matters when you are handing an agent access to your file system and browser.

Cons

  • No API surface exists, so you cannot trigger Collie from a script, a CI job, or an external scheduler — any team that needs to embed AI task execution inside an automated pipeline will have to run it interactively or switch to an agent framework that exposes a callable interface.
  • Linux installation requires Python 3.12 or later and a pip install from GitHub; teams on managed Linux environments where Python version is locked by policy will need to resolve that dependency before anything runs.
  • The tool is scoped to single-session, single-machine operation with no documented multi-agent coordination — workflows that need parallel agents handing off between steps are outside what the current architecture supports, and teams building those patterns will move to a framework designed for it.

About

Platforms
Windows, macOS, Linux
API Available
No
Self-Hosted
Yes
Last Updated
August 14, 2026

Best For

Who it's for

  • Developers needing local AI assistance with real environment access
  • Users wanting private, no-telemetry task automation
  • Workflows that require browser control and file system changes

What it does well

  • Fix bugs and verify fixes by running reproduction tests
  • Automate browser-based tasks while signed into accounts
  • Organize files and summarize documents on the local machine
  • Set up or migrate projects and run setup commands

Frequently Asked Questions

Is Collie free?
Collie offers a free option. Hosting, model usage, or optional services may have separate costs; check the pricing details and official terms.
Is Collie open source?
Yes. Collie is open source.
Can I self-host Collie?
Yes. Collie supports self-hosting on your own infrastructure.
What platforms does Collie support?
Collie is available on: Windows, macOS, Linux.

Coding agents often stop at suggestions

Most coding agents give you advice. They suggest the fix, sketch the diff, explain the approach — then hand it back to you to actually run it. Collie runs it, checks it passed, and only tells you it’s done when it is.

How it operates

Collie is a local, open-source coding agent that operates directly on your machine — your file system, your signed-in browser session, your real terminal. You describe the task in plain language, Collie does the actual work, then writes a verification step and runs it before declaring the job complete. It installs as a desktop app on Windows and macOS, or via a single pip command on Linux. No telemetry, no cloud relay — your files and credentials stay local.

Supported tasks

Use cases include fixing bugs and verifying fixes by running reproduction tests, automating browser-based tasks while signed into accounts, organizing files and summarizing documents on the local machine, and setting up or migrating projects and running setup commands.

Strengths and limits

It runs against your real browser session and signed-in accounts, writes and runs a verification step before calling a task complete, and keeps source code and session credentials on your machine. No API surface exists, so it cannot be triggered from a script or CI job. Linux installation requires Python 3.12 or later.

Who it is for / who should skip it

Best for developers needing local AI assistance with real environment access, users wanting private no-telemetry task automation, and workflows that require browser control and file system changes. Teams that must embed AI task execution inside automated pipelines or run on managed Linux with locked Python versions should skip it.

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