Capacity records 24,300 monthly visits with -22.9% month-over-month growth and Free Trial pricing. Code Arena records 35,827,928 monthly visits with +19.4% growth and Free pricing.
Turn a plain-language idea into a real, live web app — no code required
Battle-test AI coding models side by side
| Dimension / Metric | | |
|---|---|---|
| Official Domain | capacity.so | arena.ai |
| Pricing Model | Free Trial | Free |
| Monthly Visits | 24.3K (24,300) | 35.83M (35,827,928) |
| MoM Traffic Delta | -7.21K (-22.9%) | +5.83M (+19.4%) |
| Primary Market & Share | 🇺🇸 United States (21.9%) | 🇮🇳 India (13.1%) |
| Direct Visits / mo | 9.89K | 24.34M |
| User Rating | 4.2 | 4.7 |
| Supported Platforms | Website | Website |
Turn a plain-language idea into a real, live web app — no code required
Type a short description of your idea and Capacity asks a few questions, then builds the pages, data and logins in minutes with a live preview.
Generated apps can include member accounts, logins, saved data and payments, not just static mockups.
Connect Capacity to Claude or ChatGPT and build from the chat; each message runs on your AI plan rather than Capacity credits.
One click publishes the app to the internet, and you can attach a custom domain name in minutes.
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.
High-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs.
High-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs.
Autonomous enterprise AI agents and CRM intelligence powered by Salesforce Data 360 and Atlas.
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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.
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.
Describe your idea in chat and Lovable turns it into a working app or website
Describe your idea in chat and Lovable turns it into a working app or website
Build and share random generators for free with lists and simple code
Build and share random generators for free with lists and simple code
Deploy AI agents and build apps conversationally on top of your own data
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The AI coding agent for building ambitious software
The AI coding agent for building ambitious software
Anthropic's AI assistant for real work, from chat to agents
Build working apps, websites, and AI agents by describing them
Build working apps, websites, and AI agents by describing them
Describe your idea and Replit builds a working app in minutes
Describe an app in chat and ship it
An agentic coding platform that ships real software
