An honest comparison

Kept vs Atoms

Atoms is the comparison we respect most. It's the official app of Atomic Habits, built with care, and its core belief · that lasting change is identity change, one small proof at a time · is a belief we share completely. If you're choosing between us, you've already accepted the idea that matters.

The difference is surface area: Atoms applies that idea to your habits. Kept applies it to your whole day.

KeptNotionSunsama/AkiflowAtoms
Setup requiredNone · useful in 60sBuild it yourselfGuided ritual, dailyMinimal
Files itselfYes · one-line captureNoPartialn/a
Whole life (work + body + mind)YesWork/docsWorkHabits only
Identity engineYes · vow & votesNoNoYes
Mobile-first & calmYesNoDesktop-firstYes
PriceFree to start; fair annualFree → $10–20/mo~$17–34/mo~$120/yr

Competitor details as of June 2026; see their sites for current pricing.

What Atoms gets genuinely right

Atoms takes James Clear's framework seriously instead of slapping his name on a streak counter. Habits are framed as identity votes ("I am a runner," not "run 3x/week"), the coaching is patient, the design is calm, and it never punishes you with guilt mechanics. The onboarding that walks you from an identity to a tiny first habit is some of the best behavior-science product work on the App Store.

It also proved something commercially important: people will pay real money · $16.99/month or $119.99/year · for identity-based habit change with a strong philosophy behind it. If your one goal this year is to establish a small number of keystone habits, and you want the canonical Atomic Habits experience, Atoms is exactly that.

Habits are votes · but a life is the election

The most common thing people say about Atoms after a few months is some version of: I love the idea, but it's a thin slice. The free tier tracks one habit; Pro caps you at six. There's no calendar, no tasks, no notes, no training plan, no food, no focus timer. The habit exists in a vacuum, separated from the day it has to survive in.

That matters because habits don't fail in the abstract. They fail at 6:40am when the run collides with an early meeting you tracked in another app. They fail when the deep-work block never got onto the calendar at all. A habit tracker can tell you that you broke the chain; it can't see why, because the why lives in the rest of your life · the part it doesn't hold.

What Kept does instead

Kept is built on the same identity loop · declare who you're becoming, keep small promises, count them as votes · but the votes come from your entire day, not a list of six habits. The morning run, the deep-work block, the meal that fuels the long run, calling your mom: all of it is captured, filed, and counted on one calm surface.

Capture is the difference you feel first. Say one line · "easy run 8 miles tomorrow, then call Mom" · and Kept files an event and a task, correctly, in under five seconds. No forms, no setup. The habit layer then lives next to your real schedule, so conflicts are visible before they break the chain, and your protocol adjusts with the life around it.

And because the surface is wider, the proof is richer. Atoms can show you a streak. Kept can show you that you kept nine promises this week, across body and work and people, and what that's evidence of.

The science, taken seriously either way

Both products stand on the same research, and it's worth naming because it's the reason either of us works. Implementation intentions · if-then plans that bind a behavior to a time and place · carry a medium-to-large effect on follow-through (d = 0.65 across 94 studies). Habits take roughly 66 days of repetition in context to become automatic. And identity-consistent framing makes repetition stick, because people protect evidence about who they are far more fiercely than progress toward what they want.

Atoms applies that science to the habit in isolation, and applies it well. Kept's bet is that the context variable matters more than the category assumed: the if-then plan is easier to keep when the "if" (your real schedule, your training load, your energy) lives on the same surface as the "then." A promise is easier to keep when the system can see everything that threatens it.

Who should pick which

Pick Atoms if you want the focused, canonical Atomic Habits experience · a small number of habits, patiently coached, in the author's own voice. As a single-purpose tool with a philosophy, it's the best in its class.

Pick Kept if you want the same philosophy with a whole-life body: habits that live next to the tasks, calendar, training, food, and focus they depend on, at a fair annual price under Atoms' $119.99/year. The idea is right either way. The question is how much of your day you want it pointed at.

Atoms pricing (free tier limited to one habit; Pro at $16.99/mo or $119.99/yr, up to six habits) verified June 2026. See the App Store listing for current details. Verified June 2026.

Say it once. It’s filed.

One calm app, not six · free to start, iPhone first.

iPhone first · Free to start · No spam, ever

FAQ

Questions, answered

Is this another AI chatbot?

No. There's no chat window to babysit. The intelligence works in the background · filing your captures, prepping your day · then gets out of the way. You'll mostly notice it as things simply being where they belong. And your pick always wins.

What does it replace?

A task manager, a calendar app, a notes app, a habit tracker, a focus timer, and a food log. One calm app, not six.

Is my data private?

Private by default. Capture works on-device first; storing capture text in the cloud is off until you turn it on. Your words stay yours.

What does it cost?

Free to start. The full system will be a fair annual subscription · founding members get founder pricing, locked in.