There are over a dozen open-source AI coding tools that have gained serious traction in 2026. They range from terminal pair programmers to full agent platforms to browser-based visual editors. This is a factual comparison of every major one, organized by architecture category. We built Frontman (one of the tools listed), so we’ll note that where relevant and call out where other tools are stronger.
Last updated: March 2026. Star counts are approximate.
The Full List
| Tool | Stars | License | Category | BYOK | Status |
|---|---|---|---|---|---|
| OpenHands | 68,500 | MIT | Agent platform | Yes | Active |
| Cline | 58,600 | Apache-2.0 | VS Code extension | Yes | Active |
| Aider | 41,200 | Apache-2.0 | CLI | Yes | Active |
| Tabby | 33,000 | Apache-2.0 | Self-hosted | Local models | Active |
| Goose | 32,300 | Apache-2.0 | CLI + Desktop | Yes | Active |
| Continue | 31,600 | Apache-2.0 | CLI + IDE | Yes | Pivoting |
| Void | 28,300 | Apache-2.0 | IDE (VS Code fork) | Yes | Paused |
| Roo Code | 22,500 | Apache-2.0 | VS Code extension | Yes | Active |
| bolt.diy | 19,100 | MIT | Cloud IDE | Yes | Active |
| Kilo Code | 16,200 | Apache-2.0 | VS Code + JetBrains | Yes | Active |
| Stagewise | 6,500 | AGPL-3.0 | Browser-based | Partial | Active |
| Frontman | ~131 | Apache-2.0 / AGPL-3.0 | Browser-based | Yes | Active |
Apache-2.0 is the dominant license. AGPL-3.0 appears on Stagewise and Frontman’s server component. MIT on OpenHands and bolt.diy.
CLI-Based Tools
Aider
aider.chat | 41,200 stars | Apache-2.0
Terminal-based AI pair programmer. You run aider in your project directory and chat with it. It maps your repo structure, edits files directly, and auto-commits changes to git. Written in Python. Works with any LLM via BYOK.
Aider has scored consistently well on SWE-bench (the standard benchmark for AI code editing). It has 93 releases and 13,100+ commits as of March 2026. For developers who prefer working in the terminal over a GUI, it’s the most mature option.
It works with any editor and has excellent git integration (auto-commits with sensible messages). The tradeoff: it’s terminal-only with no visual interface, can’t see a running application, and repo mapping can hit memory limits on very large monorepos.
Goose
block.github.io/goose | 32,300 stars | Apache-2.0
Built by Block (the company behind Square and Cash App). Goose is a local AI agent with both a CLI and a desktop app. It goes beyond code suggestions: install dependencies, run commands, execute tests, edit files. MCP integration for extensibility.
Corporate backing from Block means long-term maintenance is likely. The desktop app makes it accessible to non-terminal users, and MCP support lets it connect to external tools. It’s still rough around the edges for complex multi-file refactoring compared to Aider, and relatively new despite the high star count.
IDE-Based Tools (VS Code Extensions)
Cline
github.com/cline/cline | 58,600 stars | Apache-2.0
Autonomous coding agent that runs as a VS Code extension. Cline can create and edit files, run terminal commands, use a headless browser, and work with MCP tools. Every action requires human approval before execution, keeping you in the loop.
Cline spawned two major forks (Roo Code and Kilo Code) that have become independent projects. The original remains the most popular with 238 releases and an enterprise offering (SSO, audit trails) through Cline Bot Inc.
It has the largest community of any open-source coding agent, with human-in-the-loop approval for every action and support for every major LLM provider via BYOK. The approval workflow adds friction for routine operations, and quality depends heavily on which model you connect. VS Code only.
Roo Code
roocode.com | 22,500 stars | Apache-2.0
Originally forked from Cline, Roo Code has diverged into its own product. The main differentiator is a multi-mode system: Code mode for editing, Architect mode for planning, Ask mode for questions, Debug mode for troubleshooting, and customizable modes you define yourself. Backed by Roo Code, Inc.
The mode system gives more structured control over the agent’s behavior than Cline’s single-mode approach, and custom modes let teams define specialized workflows. 300 contributors as of March 2026. On the other hand, it’s VS Code only, and the mode switching adds a mental model layer that some developers find unnecessary.
Kilo Code
github.com/Kilo-Org/kilocode | 16,200 stars | Apache-2.0
Another descendant of the Cline family, Kilo Code targets both VS Code and JetBrains. Claims over 1.5 million users and reports being the highest-volume consumer on OpenRouter. Positions itself as an “all-in-one agentic engineering platform.”
The JetBrains support sets it apart (most Cline-family tools are VS Code only), and the high usage volume suggests stability at scale. It’s newer and less documented than Cline or Roo Code, and the feature set overlaps heavily with its parent project.
Continue
docs.continue.dev | 31,600 stars | Apache-2.0
Continue started as an open-source Copilot alternative with autocomplete and chat in VS Code and JetBrains. It has since pivoted toward “AI checks in CI,” a CLI tool that runs AI-powered code review checks in your CI pipeline. The IDE extension still exists but is no longer the primary focus.
451 contributors and 802 releases make it one of the most mature projects in this space. The CI pivot is interesting: enforcing code quality via AI at the pipeline level instead of the editor level. But the pivot also means the IDE experience may receive less attention going forward. If you want an IDE assistant, the Cline family or Tabby are more focused options.
Self-Hosted Code Completion
Tabby
tabbyml.com | 33,000 stars | Apache-2.0 (open-core)
Self-hosted AI coding assistant. Tabby provides code completion and chat for VS Code, JetBrains, and IntelliJ, running entirely on your own infrastructure. Written in Rust. Supports local models and has an answer engine that indexes your codebase.
For teams that can’t send code to external APIs (regulated industries, air-gapped environments), Tabby is the primary option. Enterprise features (team management, SSO) require a separate license.
No code leaves your infrastructure, and the Rust implementation is fast. The tradeoff is that running local models requires meaningful GPU hardware, and smaller models produce noticeably worse completions than GPT-4 or Claude. Some features are behind an enterprise paywall.
IDE Forks
Void
voideditor.com | 28,300 stars | Apache-2.0
Void was the most direct open-source alternative to Cursor: a full VS Code fork with built-in AI agents, change visualization, and BYOK model support.
The project paused development in late 2025. The README states: “We’ve paused work on the Void IDE to explore a few novel coding ideas… we might not resume Void as an IDE.” They are not reviewing issues or PRs.
Void is worth mentioning because of its star count and because it validated demand for an open-source Cursor. But it’s not an active project. If you’re evaluating it, check the repo status before investing time.
Agent Platforms
OpenHands
openhands.dev | 68,500 stars | MIT (open-core)
Formerly OpenDevin. OpenHands is a full AI-powered development platform with an SDK, CLI, local web GUI, and hosted cloud version. Agents can browse the web, write and execute code, manage files, and handle end-to-end development workflows.
Think of it as an open-source Devin. The scope goes well beyond code editor assistance into autonomous development. The cloud version offers a free tier with a Minimax model, and the enterprise version runs in your VPC.
Highest star count in the space, MIT license, 479 contributors. That broad scope is both the appeal and the risk: autonomous agents are powerful but unpredictable, and the self-hosting setup is complex. Enterprise features require a separate license.
Browser-Based Tools
These tools take a different approach from everything above. Instead of working from source files in an IDE or terminal, they connect to your running application in the browser.
Stagewise
stagewise.io | 6,500 stars | AGPL-3.0
YC-backed. npx stagewise@latest starts a proxy and injects a toolbar into your running web app. Click an element, describe the change, and either Stagewise’s built-in agent or a bridged IDE agent (Cursor, Copilot, Windsurf, Cline, Roo Code) generates the edit. Framework-agnostic: React, Next.js, Vue, Angular.
Zero install friction (no changes to your codebase), and the IDE agent bridge lets you route edits through Cursor or Copilot if you already use them. Framework-agnostic. YC-backed. The catch: 10 free prompts per day, 100/day for ~20/month. The built-in agent requires a Stagewise account with no true BYOK, and the proxy architecture gives it limited server-side context.
Frontman
frontman.sh | ~131 stars | Apache-2.0 (client) / AGPL-3.0 (server)
Disclosure: We built this.
Frontman is an open-source AI coding agent that hooks into your dev server as framework middleware for Next.js, Astro, and Vite (React, Vue, Svelte). Because it installs inside the framework, it has access to things the proxy approach can’t reach: component tree, computed styles, server-side routes, server logs, and compiled modules, all exposed via MCP. Click any element, describe the change, get a source code edit with hot reload.
Fully free, no prompt limits, no account required. BYOK with Claude, OpenAI, or OpenRouter. Designers and PMs can make visual changes without touching an IDE.
It’s early stage: small community, incomplete documentation, rough edges. Only three frameworks supported (Next.js, Astro, Vite). Source mapping breaks on deeply abstracted component libraries. 131 stars means limited real-world validation.
bolt.diy
github.com/stackblitz-labs/bolt.diy | 19,100 stars | MIT
The open-source version of Bolt.new. Generates and runs full-stack web apps in the browser using WebContainers. Supports 19+ LLM providers via BYOK. Electron desktop app available.
bolt.diy targets a different use case from Stagewise and Frontman. It generates new applications from scratch in a sandbox. The others edit existing codebases.
MIT license, 10,400 forks, and a desktop app for offline use. But the WebContainers API requires a commercial license for production/for-profit use, which undermines the MIT license promise. It generates in a sandbox rather than your real codebase, so it’s less useful for iterating on existing projects.
How to Choose
The right tool depends on what you’re trying to do:
“I want AI autocomplete in my editor.” Tabby (self-hosted), Continue (cloud), or GitHub Copilot (proprietary, for comparison).
“I want an AI agent in my terminal.” Aider for pair programming with git integration. Goose for broader task execution beyond just code.
“I want an AI agent in VS Code.” Cline is the most popular. Roo Code if you want structured modes. Kilo Code if you need JetBrains support.
“I want to click things in the browser and have AI edit the code.” Frontman if you want deep framework integration and BYOK. Stagewise if you want zero-install and IDE agent bridging.
“I want to generate a new app from a prompt.” bolt.diy or OpenHands.
“I want a full autonomous developer agent.” OpenHands is the most complete option.
Many of these tools are complementary. Using Aider in the terminal doesn’t prevent you from also using Frontman in the browser for visual tweaks. Using Cline in VS Code doesn’t conflict with Tabby for completions. Pick the tools that match your specific workflow gaps.