Mem is a notes application rebuilt around AI, which the company now describes as an AI thought partner rather than just a place to store text. The idea is to reduce the manual work of organizing notes: users capture ideas quickly by typing, dictating, or sending them in, and Mem automatically categorizes and connects related notes, surfaces relevant past material as someone writes, and lets users chat with their entire knowledge base to find, summarize, and synthesize what they have collected. The relaunched version, released in 2025, was rebuilt to be offline-first and fast, with an emphasis on reliability for people doing serious thinking and writing. Mem is aimed at entrepreneurs, executives, and creatives who accumulate a lot of notes but struggle to retrieve and use them, positioning itself against both traditional structured tools that require diligent tagging and simple note apps that become an unsearchable pile. It is available on the web, desktop, and iOS, with limited Android access. Mem offers a free plan with a monthly cap on the number of notes and AI chat messages, and a paid Pro subscription that removes those limits and unlocks the full set of AI features.