Mnemosphere

Mnemosphere is a chat workspace where one prompt can go to several leading models at once, including GPT, Claude, Gemini, DeepSeek, Grok and Sonar. Researchers, founders, product managers and analysts use it to compare and combine responses.

Answers appear next to each other so you can pick the best lines from each model and build a remixed answer. Parallel prompts run variations at the same time, mind maps lay out ideas visually, and Prompt Assist offers rewrites such as explaining to a child, shifting tone or staging a debate.

The aim is to replace separate AI subscriptions and browser tabs with one place where you can test the same question across labs. The homepage says plans start at $25 a month, and it targets people who do heavy research or writing every day.