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Fission-AI/OpenSpec

Spec-driven development (SDD) for AI coding assistants.

TypeScript ◇ ai MIT

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★70.5KSTARS

⑂4.8KFORKS

!225ISSUES

🏆#144GLOBAL RANK

🔥6DAYS TRENDING

🚀

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Star History

Continuous Observations

Interactive star growth chart for Fission-AI/OpenSpec

Momentum

+1.8K

STARS · LAST 30 DAYS

PER DAY

#39

MOST-STARRED TypeScript

Window	7 days	30 days	90 days
Stars gained	+413	+1.8K	+5.3K
Per day	59	59	59
Forks gained	+24	+97	+242

OpenSpec gained 1.8K stars in the last 30 days, about 59 a day, and now has 70.5K. It is about 1 year old and has averaged roughly 70.5K stars a year. It ranks #39 among TypeScript repositories and #144 across all languages on GitHubRepo.

Trending Record

OpenSpec has maintained a continuous presence across global trending indexes, peaking at #43. Below is the 30-day activity profile:

💡 Overview

OpenSpec is an open-source project written in TypeScript: Spec-driven development (SDD) for AI coding assistants.

Engineered for speed, consistency, and developer ease, it solves common hurdles in ai, context-engineering, engineering. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.

⚡ Key Features

Optimized execution pipeline written in TypeScript for predictable speed.

Zero-friction configuration with comprehensive sensible defaults out of the box.

Cross-platform runtime support across Linux, macOS, and Windows environments.

Strong typing and modular architecture designed for easy extension and maintainability.

Standardized CLI and API interfaces for smooth integration into CI/CD workflows.

Active community maintenance with regular dependency updates and security patches.

📥 Installation

terminal

$ npm install OpenSpec

$ npm install OpenSpec # or: pnpm add OpenSpec

> npm install OpenSpec

⚙ System Requirements

Platforms

• macOS
• Linux
• Windows

Runtime & Dependencies

Node.js >= 18, npm, pnpm or bun

Architecture

x86_64, ARM64 (Apple Silicon & Graviton)

🧠 How It Works

OpenSpec coordinates its core functionality through a modular TypeScript pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.

🎯 Production Use Cases

Autonomous AI Agents

Orchestrate intelligent workflows and tool-calling routines with OpenSpec.

Model Inference & Prompting

Integrate fast, local or cloud-hosted generative AI models directly into production code.

Context Memory & RAG

Augment language models with dynamic vector retrieval and structured project memory.

Developer Productivity

Automate repetitive engineering tasks, code generation, and test creation using AI agents.

🚀 Getting Started

Install OpenSpec using your package manager: `npm install OpenSpec`

Initialize your project workspace or configuration file for OpenSpec.

Import OpenSpec into your codebase or invoke it directly from your terminal.

Execute your test suite or run `OpenSpec --help` to verify successful setup.

👍 Strengths

Active community backing with 70,183 GitHub stars and verified adoption.

Permissive open-source distribution under the MIT license.

Built in TypeScript for high execution speed and developer familiarity.

Cross-platform compatibility across modern Linux, macOS, and Windows environments.

Clean modular design allowing flexible configuration and pipeline integration.

⚠️ Considerations

Requires familiarity with TypeScript and modern CLI workflows.

Ecosystem extensions may require manual configuration depending on environment constraints.

Active development roadmap means breaking API changes may occur across major versions.

⇄ Alternatives & Direct Competitors

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Compare ↗

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DeepSeek Harness: Everything is a Plugin.

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This is the repo for Vue 2. For Vue 3, go to https://github.com/vuejs/core

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anomalyco/opencode ★ 210.6K TypeScript

The open source coding agent.

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👥 Who Should Use This

Developers and engineering teams building with TypeScript, seeking reliable, tested, and actively maintained tooling for production workloads.

🏆 Nearby in the Rankings

Fission-AI/OpenSpec is currently ranked #144 by stars across every repository tracked on GitHubRepo. These are adjacent projects:

Rank	Repository	Language	Stars	Action
#139	ruvnet/ruflo	TypeScript	★ 73.4K	Compare ↗
#140	moby/moby	Go	★ 72.1K	Compare ↗
#141	nektos/act	Go	★ 72.1K	Compare ↗
#142	pbakaus/impeccable	JavaScript	★ 72.1K	Compare ↗
#143	FoundationAgents/MetaGPT	Python	★ 70.7K	Compare ↗
#144	Fission-AI/OpenSpec This Project	TypeScript	★ 70.5K
#145	swiftlang/swift	Swift	★ 70.4K	Compare ↗
#146	microsoft/AI-For-Beginners	Jupyter Notebook	★ 69.2K	Compare ↗
#147	BurntSushi/ripgrep	Rust	★ 68.7K	Compare ↗
#148	openinterpreter/openinterpreter	Rust	★ 68.5K	Compare ↗
#149	asgeirtj/system_prompts_leaks	JavaScript	★ 68.5K	Compare ↗

Frequently Asked Questions

What does OpenSpec do? +

Spec-driven development (SDD) for AI coding assistants.

What language is OpenSpec written in? +

The primary language is TypeScript. Topics include: ai, context-engineering, engineering, planning, prd.

Is OpenSpec actively maintained? +

Yes, the last recorded push was on Sep 25, 2026 with 225 open issues being tracked.

How many stars does OpenSpec have? +

OpenSpec has 70,471 stars and 4,831 forks on GitHub.

How does OpenSpec rank among GitHub repositories? +

With 70,471 stars, Fission-AI/OpenSpec is ranked #144 globally across all repositories tracked on GitHubRepo and #39 among TypeScript projects.

What license is OpenSpec distributed under? +

The repository reports a MIT license. Always verify the repository LICENSE file for legal terms.

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LinkedIn

Why OpenSpec is replacing paid subscriptions for engineering teams

Stop paying $50+/month for locked SaaS tools.

Over 70,471 developers have starred Fission-AI/OpenSpec, an impressive TypeScript open-source project designed to Spec-driven development (SDD) for AI coding assistants.

Key Engineering Advantages:
• 100% Local-First: Complete data privacy with zero tracking or telemetry.
• Zero Subscription Costs: No paywalls, per-seat fees, or API markups.
• Complete Customization: Native open-source architecture you can fork, inspect, and deploy anywhere.
• Proven Adoption: 70,471 GitHub stars and 4,831 forks.

If you're looking to streamline your engineering workflows without ballooning software expenses, this is worth checking out.

👉 Full star velocity and architectural report: https://githubrepo.cloud/repo/Fission-AI/OpenSpec
⭐ GitHub Repository: https://github.com/Fission-AI/OpenSpec

#OpenSource #SoftwareEngineering #DeveloperTools #Tech #Programming #TypeScript

🤖

Reddit (r/opensource, r/webdev, r/selfhosted)

Show r/opensource: OpenSpec – A free, self-hosted tool that lets you Spec-driven development (SDD) for AI coding assistants

Hey everyone,

I wanted to share an interesting open-source project called **OpenSpec** (https://github.com/Fission-AI/OpenSpec) that has been picking up heavy momentum lately (70,471 stars).

### What problem does it solve?
Many existing tools in this domain require expensive cloud plans or store your data on third-party servers. OpenSpec was built with a local-first philosophy, allowing developers to Spec-driven development (SDD) for AI coding assistants without recurring subscription costs or privacy compromises.

### Tech Stack & Details:
- **Language:** TypeScript
- **License:** MIT
- **GitHub:** [Fission-AI/OpenSpec](https://github.com/Fission-AI/OpenSpec)
- **Live Star Momentum Tracker:** [https://githubrepo.cloud/repo/Fission-AI/OpenSpec](https://githubrepo.cloud/repo/Fission-AI/OpenSpec)

Has anyone here tested this in production or integrated it into existing pipelines? Would love to hear your experience and feedback!

🟧

Hacker News (Show HN)

Show HN: OpenSpec – Spec-driven development (SDD) for AI coding assistants

Hi HN,

OpenSpec is an open-source TypeScript project designed to Spec-driven development (SDD) for AI coding assistants.

Rather than relying on closed cloud endpoints, it executes locally on your own machine, providing predictable latency, total privacy, and full control.

Repository: https://github.com/Fission-AI/OpenSpec
Documentation & Metrics: https://githubrepo.cloud/repo/Fission-AI/OpenSpec

Feedback and PRs are welcome.

✍️

Dev.to / Hashnode Tags: opensource, typescript, devtools, webdev

This GitHub repo replaces a $50 a month tool! Stop paying expensive software subscriptions. Meet OpenSpec (70,471 GitHub Stars)

---
title: This GitHub repo replaces a $50 a month tool! Stop paying expensive software subscriptions. Meet OpenSpec
published: true
tags: opensource, typescript, devtools, programming
---

## Stop Paying Software Subscriptions For This

Finding high-quality, production-ready open source alternatives to expensive proprietary software can save engineering teams thousands of dollars every year.

Today, we're looking at **[Fission-AI/OpenSpec](https://github.com/Fission-AI/OpenSpec)**, a rapidly rising repository with **70,471 GitHub stars** and **4,831 forks**.

### What is OpenSpec?

> Spec-driven development (SDD) for AI coding assistants

Written in **TypeScript**, OpenSpec runs directly on your local workstation or private server, keeping your data secure and eliminating recurring license fees.

### Key Highlights
- **High Performance:** Lightweight, reliable, and built in TypeScript.
- **Privacy & Security:** Complete ownership of your environment and data.
- **Growing Momentum:** Ranked **#144** globally across tracked repositories on [GitHubRepo](https://githubrepo.cloud/repo/Fission-AI/OpenSpec).

### Quick Start
To get started locally:

```bash
git clone https://github.com/Fission-AI/OpenSpec.git
cd OpenSpec
```

Check out the full repository and star history analytics here:
- **GitHub:** [Fission-AI/OpenSpec](https://github.com/Fission-AI/OpenSpec)
- **Star Velocity Tracker:** [OpenSpec on GitHubRepo.cloud](https://githubrepo.cloud/repo/Fission-AI/OpenSpec)

𝕏

X / Twitter Communities

Thread / Community Post for OpenSpec

Developers are sleeping on this GitHub repo 👇

Fission-AI/OpenSpec (70,471 ⭐) replaces expensive monthly software subscriptions with 100% free open source code.

⚡ What it does: Spec-driven development (SDD) for AI coding assistants
💻 Built with: TypeScript
🔒 100% local execution & privacy

Check live star velocity and benchmarks:
https://githubrepo.cloud/repo/Fission-AI/OpenSpec

#opensource #developer #coding #tech #programming

🧵

Threads Topics

Topic Discussion: Open Source & Developer Tools

This GitHub repo replaces a $50/month tool! 🚀

If you want to save hours of manual work and stop paying subscriptions, check out Fission-AI/OpenSpec.

It already has over 70,471 stars and lets you Spec-driven development (SDD) for AI coding assistants.

Drop a comment if you've tried it, or check the full star momentum report:
https://githubrepo.cloud/repo/Fission-AI/OpenSpec

From our network

Fission-AI/OpenSpec

Star History

Momentum

Trending Record

💡 Overview

⚡ Key Features

📥 Installation

⚙ System Requirements

Platforms

Runtime & Dependencies

Architecture

🧠 How It Works

🎯 Production Use Cases

Autonomous AI Agents

Model Inference & Prompting

Context Memory & RAG

Developer Productivity

🚀 Getting Started

👍 Strengths

⚠️ Considerations

⇄ Alternatives & Direct Competitors

👥 Who Should Use This

🏆 Nearby in the Rankings

Frequently Asked Questions

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