4KM 4KM .ai
4km.co

4km studio

AI apps built in the open.

  • 4km.ai is the product studio inside 4KM.
  • We build small, purposeful apps.
  • We show real status instead of launch copy.
See the apps Read the studio stance

Apps

Apps in the open

Full catalog

⏳

Time's Up

  • Stop doomscrolling with local-first site limits and focus guardrails.

Live on the Chrome Web Store

🧵

Praxis

  • Private CBT practice for catching loops and choosing the next action.

Building

🗂️

Mnemosyne

  • A private knowledge vault for notes, decisions, and working memory.

Building

Privacy posture

Sensitive user workflows are designed for local-first behavior and clear opt-in boundaries.

Human pace

AI should reduce cognitive load. It should not turn a personal tool into another feed to manage.