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Code Arena records 35,827,928 monthly visits with +19.4% month-over-month growth and Free pricing. massCode records 5,724 monthly visits with -25.5% growth and Free pricing.
Battle-test AI coding models side by side
Free, open-source, local-first developer workspace for snippets, notes, APIs and diagrams
| Dimension / Metric | | |
|---|---|---|
| Official Domain | arena.ai | masscode.io |
| Pricing Model | Free | Free |
| Monthly Visits | 35.83M (35,827,928) | 5.72K (5,724) |
| MoM Traffic Delta |
| +5.83M (+19.4%) |
| -1.96K (-25.5%) |
| Primary Market & Share | 🇮🇳 India (13.1%) | 🇺🇸 United States (65.4%) |
|---|
| Direct Visits / mo | 24.34M | 2.22K |
|---|
| User Rating | 4.7 | 4.4 |
|---|
| Supported Platforms | Website | Website |
|---|
Battle-test AI coding models side by side
Send the same coding prompt to multiple leading models and compare their generated apps and logic side by side.
Watch models construct web apps and websites live, so you can see process and output, not just the final file.
Projects go beyond one-off snippets, testing how well a model structures components, routes, and styles together.
Track which coding models accumulate the most wins over time to identify consistently strong performers.
Free, open-source, local-first developer workspace for snippets, notes, APIs and diagrams
Organize reusable code fragments in nested folders, tag them for fast filtering, and jump to anything through a keyboard-driven command palette.
Write Markdown notes, explore connections between them in a graph view, and turn notes into tasks with status, priority, due dates and links to related snippets and requests.
Save API requests, run them in sequence, pass values between steps, and inspect responses or JSON diffs without leaving the app.
Connect OpenAI, Anthropic, Gemini, DeepSeek, Mistral, xAI or OpenRouter with your own key, or use a local Ollama/LM Studio model, to edit code, reorganize notes and test APIs. An MCP server exposes the same vault to external AI agents.
OpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
High-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs.
Alibaba Cloud's 4th-generation multimodal AI assistant and foundation model lineup (Qwen4-Max, Qwen4-Plus, Qwen4-Flash & open-weight Qwen4-27B) with 1M context.
Build and share random generators for free with lists and simple code
The AI coding agent for building ambitious software
Anthropic's AI assistant for real work, from chat to agents
Google's agent-first development platform for building and shipping software with AI agents
Build working apps, websites, and AI agents by describing them
Describe your idea and Replit builds a working app in minutes
Free GLM-powered assistant that turns prompts into slides, sites and code
Learn to code free with hands-on lessons and instant playgrounds
Write code with precision, hand bigger jobs to agents, and keep working from anywhere
OpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
High-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs.
Alibaba Cloud's 4th-generation multimodal AI assistant and foundation model lineup (Qwen4-Max, Qwen4-Plus, Qwen4-Flash & open-weight Qwen4-27B) with 1M context.
Build and share random generators for free with lists and simple code
The AI coding agent for building ambitious software
Google's agent-first development platform for building and shipping software with AI agents
Build working apps, websites, and AI agents by describing them
Learn to code free with hands-on lessons and instant playgrounds
Write code with precision, hand bigger jobs to agents, and keep working from anywhere
