nenspace

nenspace is a thinking and note-taking tool that combines a personal knowledge base with an AI that questions you instead of just agreeing. It calls itself "an extended mind, not a second brain" — the idea is that your working memory can only hold about four things, so nenspace stores the rest and helps you think through them. It replaces the typical stack of ChatGPT, Notion, Todoist, and a habit tracker with one space where notes, tasks, habits, and AI conversation live together.

The tool has two main parts: the Sift and the Field. The Sift is where you dump incoming thoughts — things like "book the dentist," "that essay on attention," or "zazen every morning" — and nenspace sorts them into categories like today, notes, habits, or a book project. The AI, called nen-1, is trained to push back rather than validate. If you say "the plan is solid, right?" it might ask which part keeps getting re-read. It also notices patterns: if you've repeated a commitment three times in 23 days, it flags that and offers to make it a habit or let it go. The Field is the note-taking side, where you can write freely and ask nen-1 questions about any page.

nenspace is for people who feel scattered across too many apps and want a single place to capture thoughts, track commitments, and get honest feedback from an AI. Writers, thinkers, and anyone trying to build better habits will find it useful. It costs $13 a month — less than ChatGPT alone — and is available as a web app and an iOS app. There's a free tier to start, no credit card required.