Side by side
Arena (formerly Chatbot Arena) vs DeepEval
Both stand on llm evaluation tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Open source APISelf-hostedWeb
Arena combines public response comparisons with ranked results across a range of task areas. Users should note its daily usage limit and the stated use of conversations.
Visit Arena (formerly Chatbot Arena)
Free plan Open source APILinuxMac+3
DeepEval offers a broad toolkit for evaluating AI systems across modalities, metrics, and agent workflows. Its open-source edition is positioned for pre-production testing; enterprise collaboration and deployment options are described separately through Confident AI Evals.
Visit DeepEvalThe facts
| Arena (formerly Chatbot Arena) | DeepEval | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Yes | Yes |
| Runs on | API, Self-hosted, Web | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Free or on request | Starter: $200 a month |
| Plans published | 2 | 5 |
| Maker | Not published | Not published |
| Website | arena.ai | deepeval.com |
| On llm evaluation tools | #1 of 29 | #2 of 29 |
Arena (formerly Chatbot Arena): what it does well
- Public leaderboards can be viewed without signing in
- Rankings cover eight task areas
- Open datasets are free to access
- Commercial evaluations include service-level agreements
What to know first
- Daily usage limit applies to all users
- Video Arena permits two generations per 24 hours
- Several modes require login
- Conversations may be used for research and evaluations
DeepEval: what it does well
- Pytest-native evaluations run in CI/CD
- Lists more than 50 evaluation metrics
- Evaluates text, images, and audio
- Supports synthetic test data and persona simulations
- Integrates with agent frameworks and model providers
What to know first
- DeepEval OS is limited to pre-production testing
- Default telemetry is sent to PostHog
- OS results are kept in local files
Alternatives to Arena (formerly Chatbot Arena) Alternatives to DeepEval The whole list