Guides

Short pieces on habits and on the apps that track them. Where a guide cites research it links the paper, not a blog post about the paper.

• Best habit tracker apps

  Which habit tracker to pick, by category: pay-once, cross-device sync, Android, best free tier. Written by the makers of one of them, and it says so.

  6 August 2026

• How long to build a habit

  Not 21 days. That number comes from a 1960 plastic surgeon's observation, not a study. The research says a median of 66 days, with a range from 18 to 254.

  6 August 2026

• Trackers without an account

  A habit journal is health data. What most trackers collect, why it matters more than it looks, and the questions to ask before you install one.

  6 August 2026