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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| Arenaarena.ai | Hugging Face Spaceshuggingface.co | WebLLM Chatchat.webllm.ai | ChatGPTchatgpt.com | |
|---|---|---|---|---|
| What it does | Put one prompt to two anonymous models and vote for the better answer | Thousands of runnable AI demos, no model installed on your machine | Runs an open language model inside your browser, nothing sent to a server | The general assistant most people mean when they say they used AI |
| What it costs you | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. | Free tierA genuinely usable free tier with paid plans for volume or team features. |
| Your files | Runs on their server | Runs on their server | Runs on your device | Runs on their server |
| Where it stops | Prompts and votes are collected for research and can end up in public datasets. | Free Spaces sleep when idle and queue under load, so a popular demo can take minutes to respond. | The first run downloads gigabytes of model weights and it will not start at all without WebGPU. | Free accounts are rate-limited on the best model and get downgraded to a smaller one mid-session without warning. |
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| Category | AI Assistants & Generators | AI Assistants & Generators | AI Assistants & Generators | AI Assistants & Generators |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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