OpenSpec

OpenSpec

Fission AI
+
+

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About

OpenSpec is an open-source spec-driven development framework designed to bring structure and clarity to AI-assisted coding workflows. It introduces a lightweight specification layer that helps teams define requirements before writing code. The platform organizes each change into structured artifacts such as proposals, specifications, designs, and task lists. It integrates with over 20 AI coding tools, allowing developers to use their preferred assistants while maintaining consistency. OpenSpec emphasizes an iterative and flexible approach rather than rigid development phases. Its command-based workflow enables users to propose, implement, and archive features efficiently. Overall, OpenSpec helps developers align with AI systems, reduce ambiguity, and produce more predictable and reliable outcomes.

About

The AI sidekick that tests its own code and iterates until it works. Otto Engineer is an autonomous agent that takes AI-assisted coding to the next level. Otto executes its code and tests it to make sure it works. If there are errors, it will keep iterating until the code works. Otto is built on web containers, a runtime for executing Node.js and OS commands that runs entirely in the browser, with a virtual, in-memory file system Since it all runs in the browser, you just start a new chat and put Otto to work, watching it run commands and edit code in the embedded terminal and editor. Otto can install and use npm packages, tweak its TS config, and write its own tests. Say goodbye to hallucinated code that doesn't actually work.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Not Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers, product teams, and organizations using AI coding assistants who want a structured, spec-driven approach to improve clarity, collaboration, and development outcomes

Audience

Developers looking for an AI solution to execute code and test it to make sure it works

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Open source
Free Version Supported
Free Trial Not Supported

Pricing

Free
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Fission AI
openspec.dev/

Company Information

Otto Engineer
otto.engineer/

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Categories

Agentic AI Supported
AI Coding Agents Supported

Categories

Agentic AI Supported
AI Coding Agents Supported

Integrations

Amazon Q Developer Supported
Auggie CLI Supported
Claude Code Supported
Cline Supported
CoStrict Supported
Codebuddy Supported
Crush Supported
Cursor Supported
Factory Supported
Gemini CLI Supported
GitHub Copilot Supported
Google Antigravity Supported
Kilo Code Supported
Node.js Not Supported
OpenAI Codex Supported
OpenCode Supported
Qoder Supported
Qwen Code Supported
Roo Code Supported
TypeScript Not Supported

Integrations

Amazon Q Developer Not Supported
Auggie CLI Not Supported
Claude Code Not Supported
Cline Not Supported
CoStrict Not Supported
Codebuddy Not Supported
Crush Not Supported
Cursor Not Supported
Factory Not Supported
Gemini CLI Not Supported
GitHub Copilot Not Supported
Google Antigravity Not Supported
Kilo Code Not Supported
Node.js Supported
OpenAI Codex Not Supported
OpenCode Not Supported
Qoder Not Supported
Qwen Code Not Supported
Roo Code Not Supported
TypeScript Supported
Claim OpenSpec and update features and information
Claim OpenSpec and update features and information
Claim Otto Engineer and update features and information
Claim Otto Engineer and update features and information