Alternatives to Twelvet

Free open-source design-intelligence skill that feeds UI styles, palettes, fonts, and chart rules into Claude Code, Cursor, and other AI coding assistants.

A DESIGN.md catalog that hands your AI coding agent real brand colors, type and spacing

Trae is an AI coding IDE with parallel SOLO cloud agents and usage-metered pricing

Kombai is an AI design engineer that generates standout UI code matching your repo's real components and tokens.

A Git-native desktop API client that stores collections as local JSON files instead of in a vendor cloud.

Shipper Advisor is the AI mentor chat that reviews your build and coaches copywriting, marketing, design and product architecture.

Browser-based cloud IDE with a built-in AI coding assistant and one-click deployment for AI plugins and GPT actions.

Spec-driven development for AI coding agents: write requirements.md, design.md, and tasks.md before Claude Code, Cursor, or Copilot touch

Windsurf is now Devin Desktop: a command center for running local and cloud coding agents from one place.

Browser-based cloud IDE for coding, real-time collaboration, and one-click hosting

Free open-source JetBrains AI code assistant with agentic coding, spec-driven development and local LLM support

Open-source React framework for building a custom rich-text editor, with headless plugins, copy-in UI components and an MCP-ready AI plugin

FanBox is a free macOS terminal with a live diff viewer showing every file your Claude Code or Codex agent writes.

Kratos is the Go microservices framework for Protobuf-first APIs spanning HTTP and gRPC, plus Blades for AI agents.

Open-source Vue3+Gin admin framework with built-in AI assistant via MCP

Open-source skill that turns any brand into a design system Claude Code and Codex can build with

Silimate deploys fast AI agents for frontend chip design, converging PPA and root-causing RTL bugs in days.

Free, MIT-licensed VSCode extension for one-click AI code comments, cross-language code conversion, UI-to-code, and batch file processing.

JetBrains Air is one system for building software with agents across JetBrains IDEs, the browser, CLI and mobile

Enterprise AI coding assistant with a Context Engine for governed, air-gapped code completion

Cosmos by Augment Code orchestrates agent loops for code review, ticket-to-PR, security fixes and incident triage.

GitHub Copilot is an AI coding agent that starts work from the issue or pull request already in your repo.

Zed is a GPU-rendered Rust code editor that runs parallel AI agents at native speed

Sourcegraph Cody brings whole-codebase context to AI coding chat, completions, and agentic batch changes across hundreds of repos.

GitLab Duo Agent Platform: policy-governed AI agents that carry code changes through review, security, and CI/CD pipelines

Amazon CodeWhisperer is now Amazon Q Developer — an AI coding assistant with AWS expertise, built into your IDE and CLI

Crush: agentic coding in your terminal with multi-model switching and LSP context

Ghostwriter Chat brings file-grounded AI coding chat into Replit's browser IDE, reading your project before it answers.

Self-hosted code search and AI code Q&A that gives coding agents context across every repo you own

Batch AI code generation for unit tests, refactoring, documentation, and code conversion across 56 languages.