Comparison
CardHabit vs Atoms.
Atoms is James Clear's own app, built to be the direct implementation of Atomic Habits. CardHabit reads the same book and builds a different kind of system: a daily card draw with five cards dealt each morning, a binder of finished cards to fill, and friends you can play alongside. Both take identity-based habits seriously. They diverge on how you're held to them.
Updated November 2026
The short version
Choose Atoms if you want the direct, official implementation of the Four Laws from the author himself, with habit science content and a minimalist tracker built around the book's structure. Choose CardHabit if you've read the book, know the framework, and want a daily practice that asks something of you: a random morning draw of five cards, rare cards printed in foil, and friends you can deal in on the same card so you finish it together.
At a glance
| Feature | CardHabit | Atoms |
|---|---|---|
| Platform | iOS | iOS, Android |
| Core mechanic | Daily 5-card draw, scoped commitments | Identity-based habit tracking, Four Laws framework |
| Social mechanic | Deal a friend in: share a card, finish it together (2.0) | Community feed, light friend accountability |
| Gamification | Foil rarity finishes, a binder to fill, quiet rank and XP | Streaks, progress charts |
| Free tier | 2 daily commits | 1 habit tracked |
| Missed-day system | That streak ends; a new one starts the next morning | No dedicated missed-day system |
| Price | Free, Pro $4.99/mo or $39.99/yr (7-day trial) | Subscription, roughly $70-120/yr depending on billing |
Where Atoms wins
Atoms is the official app, built with James Clear's own team, and it stays closest to the book's actual language: the Four Laws, habit stacking, identity votes. If you want a minimalist tracker that mirrors the book chapter for chapter, with habit-science lessons built in, Atoms is the direct line to the source. It's also the broader platform: iOS and Android, where CardHabit is iOS only.
If what you need is fidelity to the book itself, not a different system inspired by it, Atoms is the more literal choice.
Where CardHabit is different
CardHabit starts from the same underlying idea: small actions compound, and identity is built through repetition. Then it turns that idea into something you can see. The morning deal of five cards means you don't design a habit list from a blank page; the app puts a hand in front of you and you commit to what you can handle. Every card you finish goes into your binder, and rarer cards carry a richer printed finish, from plain to a foil edge to full gold foil. With CardHabit 2.0 the deck splits into five suits (Physical, Mind, Nutrition, Recovery, and Connection) plus the Joker, so a full binder shows the kind of person you have been practicing being. You don't pick your identity. You collect the evidence for it.
The friend layer is the biggest divergence. Coming in CardHabit 2.0, you can deal a friend in: from any card in your hand, you send the same card into their hand for today, even by share link if they don't have the app. If you both finish it, you each get a paired foil card with both names on it. If one of you doesn't, nothing bad happens. If Atoms is the book made into software, CardHabit is the book made into a daily deal you share with people you care about.