Mem takes the opposite philosophy from tools like Notion. Instead of asking you to build a filing system, it asks you to write freely and promises the AI will organize it for you. The autotag and clustering features work reasonably well: related notes surface together without manual effort, and the natural-language search across your full note history is the feature most users cite as the reason they stay.
The paid plan at around $8.33/month (annual, $14.99/month billed monthly) unlocks AI chat with your notes and the full organizational features. At that price it's competitive, but Mem is a focus product: notes and knowledge retrieval only. If you want integrated tasks, calendar, or project tracking, you'll need other tools alongside it. The company is smaller than the Notion or Obsidian ecosystems, so it's worth considering how long the product will stay funded if AI notes as a category gets absorbed by larger platforms.