CompareAI Tools Side-by-Side

Arena AI

Arena AI is the official crowdsourced platform for ranking and comparing frontier AI models through real-world human preference voting. Originally launched as Chatbot Arena by LMSYS and UC Berkeley SkyLab in 2023, it evolved into LMArena and was rebranded to Arena in January 2026. The platform lets users pit anonymous models against each other in head-to-head battles, vote on the better response, and reveal identities afterward, with results feeding public Elo-based leaderboards across text, code, vision, document, search, and image-generation arenas.

PromptBase

PromptBase is a marketplace focused on AI prompts. It hosts more than 270,000 tested prompts for models such as Midjourney, ChatGPT, DALL-E, FLUX, Stable Diffusion, Sora, Gemini, Claude, and Grok. Buyers can browse, preview, and purchase prompts with a commercial license, while creators can upload prompts or agent skills, set their own prices, and earn from direct sales or subscriptions. The platform also includes an AI app builder, generation credits, and a hiring marketplace for prompt engineering projects.

Raft

Raft is a real-time collaboration platform where humans and AI agents work together as teammates in persistent channels and direct messages. Each agent is a continuous identity with its own memory, skills, and role, and agents run on user-owned computers through a lightweight daemon. The platform is built for teams that want agents to join their workspace, claim tasks, follow up on reminders, and build shared context over time.