The best LMArena alternatives
6 tools that do a similar job to LMArena, 1 of them open source. Each entry says what it does and who it suits, so you can pick the one that fits instead of the most famous.
You're replacing
LMArenaA public arena where you prompt two anonymous models side by side and vote, producing crowd-sourced leaderboards.
- 1
Claude Console
AI tool · Paid
Anthropic's developer console with a Workbench for testing prompts, a prompt generator and improver, and evaluation tools.
Best for: Prototyping prompts for the Claude API; Improving system prompts
- 2
Google AI Studio
AI tool · Freemium
Google's browser workspace for prompting Gemini models, testing multimodal inputs and getting API code.
Best for: Trying Gemini models free; Multimodal prompt experiments
- 3
Open WebUI
AI tool · Open source
A self-hosted chat interface for local and API models with saved prompts, document chat and a community library.
Best for: Running local models with a nice UI; Self-hosted team chat
- 4
OpenRouter
AI tool · Freemium
A unified API and chat room for hundreds of models from many providers, useful for comparing prompts across models.
Best for: Comparing many models with one key; Routing between providers
- 5
OpenAI Playground
AI tool · Paid
OpenAI's developer console for testing prompts and settings against its models, with saved prompts and an optimiser.
Best for: Prototyping prompts for the OpenAI API; Tuning parameters
- 6
TypingMind
AI tool · Paid
A chat front-end for your own API keys that adds a prompt library, agents, plugins and multi-model chat.
Best for: Power users with API keys; Keeping a personal prompt library
How we pick: tools in the same category that solve the same problem, projects that name each other as alternatives, and open-source projects that describe themselves as an alternative to LMArena. We don't take payment for placement.