Three Cells - Duolingo but for your life – habits, journal, metrics in one app

What it does

Three Cells is a mobile and web app that combines habit tracking, daily journaling, and health metric logging into one simple daily check-in. It aims to turn motivation into discipline by providing visual proof of consistency – think GitHub-style heatmaps, streak counters, and yearly overviews that show your best days. The app is designed to be fast and minimal, letting you log habits, mood, and metrics in seconds.

Who it is for

Three Cells is built for individuals who have tried multiple self-improvement apps (Notion for journaling, Todoist for tasks, separate habit trackers) and want a single, simple system they can actually use every day. It targets people looking to build discipline, improve health, reduce stress, and create lasting habits – from software engineers to anyone wanting to “get their life together.”

Why it matters

Most self-improvement tools create friction by requiring complex setups or juggling multiple apps. Three Cells addresses “app fatigue” by offering one fast daily check-in for habits, reflection, and progress. Its core insight is that visible proof of follow-through (heatmaps, streaks, yearly reviews) builds self-trust and consistency. The app is rated 4.5 stars on the App Store with over 6,000 downloads, indicating early traction.

Launch signal

Three Cells launched on the App Store and web, and was featured on Hacker News as a Show HN post titled “I spent 4 months building Duolingo but for your life.” It also received a badge from Twelve Tools, a curation site for indie apps. The founder, maghfoor, positions it as “made by someone who tried everything else first.”

Brand and naming

The name “Three Cells” refers to the three core features: habits, journal, and metrics. It’s memorable and evokes a simple, cellular structure – fitting for an app that promises a minimal, all-in-one system. The tagline “Duolingo but for your life” is a clear positioning hook, borrowing Duolingo’s gamification reputation while promising broader life tracking. The brand emphasizes simplicity, visual proof, and consistency over feature overload.