Cosine

Agentic AI Coding Assistant - Built by Devs, for Devs

4.7•6 reviews•

947 followers

Agentic AI Coding Assistant - Built by Devs, for Devs

4.7•6 reviews•

947 followers

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Cosine is an AI software engineer that operates across the CLI, cloud, and desktop, designed to complete tasks end-to-end without human supervision. It understands your codebase, plans, writes changes, and opens PRs. Working asynchronously, devs can assign multiple tickets all at once to Cosine, then come back to review and merge PRs. Tackle messy backlogs, fix bugs, and prototype faster without changing workflow.

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Promoted

Cosine Launches

Cosine SwarmParallel AI agents for long-horizon, complex software tasks

Launched on April 21st, 2026

Cosine VS Code ExtensionThe AI teammate for your editor

Launched on October 23rd, 2025

Cosine CLIAI pair programming directly in your terminal

Launched on September 11th, 2025

CosineYour AI Co-developer - Not just an LLM Wrapper

Launched on October 16th, 2023

4.7

Based on 6 reviews

Review Cosine?

Reviews of Cosine highlight strong productivity gains, especially for teams with large codebases. Users report smooth integration into existing workflows and praise its ability to break down repositories, surface relevant code, fix bugs, and speed up documentation and feature work. Some note a learning curve and that results improve with larger projects; others ask for broader IDE support and richer documentation generation. Overall sentiment is highly positive: daily-use worthy, reliable for backlog cleanup, and useful for elevating both novice and experienced developers.

Summarized with AI

Reviews

Most Informative

•1 review

Took me some getting used to, but once it was up and running it's provided some amazing efficiency gains when it comes to reviewing code, writing documentation, fixing bugs and deploying new features. Would definitely recommend giving it a spin on some of your existing repos

What's great

efficiency gains (1)bug fixing (1)documentation generation (1)

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107 views12mo ago

•1 review

I use this product on a daily basis. I train every team I consult for on Cosine.sh as the primary AI Coding Agent. It is designed for development teams and integrates into established workflows easily. It has transformed teams into coding powerhouses! Novice to Experienced, Solo to Team, Cosine.sh is my tool of choice.

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96 views12mo ago

Cosine

•1 review

Hey PH community! Super super pumped to have guys try Cosine out. If you need some inspiration as to what prompt you should use. Here are some cool ones. How does testing work? Which architecture does the consumer app use? How does error propagation work across our backend services? How do we expire authentication tokens? Explain how we implement IP based rate limiting How should I add a new chart element to our main dashboard? How can I change the request timeout on all of our services? How do I implement the useForm hook? Why would I use dependency injection in this language? Find the code which sanitises user sign up input Find the recursive tree looping in the parser Clean up the highlighted code Why are all these classes abstract? I need to add , how do I do that?

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75 views3yr ago