Arena (formerly Chatbot Arena)
7.1#6 in llm evaluation toolsFree planFree planWebAPISelf-hosted
VisitArena (formerly Chatbot Arena) vs Promptfoo
What both publish
| Fact | Arena (formerly Chatbot Arena) | Promptfoo |
|---|---|---|
| Founded | 2023 | 2024 |
| Funding | Arena says it has $250 million in venture funding led by Felicis and UC Investments, with participation from several other investors. | Crunchbase lists seed and Series A rounds, six investors including Insight Partners and Andreessen Horowitz, and 11–50 employees. |
| Product | Arena is an AI evaluation platform where users compare model responses and vote to shape public leaderboards. | Promptfoo helps developers and enterprises build secure, reliable AI applications. |
Arena (formerly Chatbot Arena) plans
- Public ArenaFree
- AI evaluationsPriced on request
Promptfoo plans
- CommunityFree
- EnterprisePriced on request
- On-PremisePriced on request
Pick Arena (formerly Chatbot Arena) if…
Arena suits people who want to compare model responses or browse public rankings across different task types. It also offers commercial evaluation services for enterprises, model labs, and developers.
Pick Promptfoo if…
Promptfoo suits developers and enterprise teams evaluating prompts, model outputs, and AI application risks. Its local and self-hosted options may appeal to teams that want to run the Community plan on their own infrastructure.