Quit21

Every day without nicotine, explained.

You don't have to do this alone. Quit21 guides you through every day of quitting. Each morning it explains what your body is doing and what to expect, with one thing to try. Each evening you close the day in a diary you can read back.

Get it on Google Play

Free. English and Ukrainian. iOS later.

The Changes tab. You've had no nicotine for 22 days. A list of pages from twenty minutes to day eight, each with a title such as One of the hardest days.

What a day looks like

There is a page for every stage, from the first twenty minutes to the first year. Cigarettes and vapes each have their own set, and every page names its sources.

  1. 08:00

    The morning tells you what today is

    The morning reminder opens today's page. What is happening in your body, what the day usually feels like, and one thing to try that fits it.

    A symptom you were warned about reads as part of the process. One nobody mentioned reads as proof that quitting was a mistake. That is why each page names the unpleasant part before it arrives.

    Day 5
    Nights
    What to expect

    Waking at three or four in the morning, fully alert, sometimes with a craving attached. Feeling underslept by lunchtime, which makes the whole week seem worse than it is.

    Try this

    Get up at your usual time however the night went. A fixed morning is what resets the clock.

    Every page lists its sources underneath.

    From the page for day 5, cigarettes.

  2. Any time

    A craving gets one button

    SOS sits on the home screen. It opens on what you've saved and on the reasons you wrote when you quit, in your own words. You can edit them in Settings whenever the reason that holds changes.

    Then a minute of paced breathing. Your phone vibrates at every change of breath, so you can follow it with your eyes closed. Afterwards one tap records what set it off, and the diary keeps it with the day.

    The SOS screen. Money saved and cigarettes not smoked at the top, three reasons in the user's own words, a button to breathe for a minute, and two equal buttons, It passed and I smoked.
    What set it off? Eleven one-tap choices, including coffee, alcohol, stress and work.
  3. 21:00

    The evening closes the day in a diary

    How the day felt, whether it went clean, and a line of your own if you want one. The diary keeps every day since you started, so a hard week can be read back later next to the easy ones.

    • Three faces for the mood, no score and no interpretation.
    • Cravings you got through are counted as well as slips.
    • The only first-person sentence in an entry is the one you wrote.

One cigarette is not a reset

Most quit apps punish a cigarette by wiping your count, or ignore it and pretend it never happened. Quit21 takes off what you actually smoked and counts the days again from tomorrow.

The money you've saved, the cigarettes you haven't smoked and every page you've already read all stay. So there is no reason to hide a slip from the app, and the numbers stay true.

FigureBeforeAfter one cigarette
Cigarettes not smoked339338
Saved169.58 $169.08 $
Pages you've opened2525
Day countDay 23Day 1 tomorrow
A pack of 20 at 10 $, so one cigarette costs 50 cents. That is all it takes off.
The home screen. 169.58 dollars saved, 339 cigarettes not smoked, 16 packs not bought, the next milestone in 10 hours, and the SOS button.

Minimalist by design

Two numbers and one button. The home screen shows what you've saved and what you haven't smoked, at full size, and the SOS button under them. No confetti and no feed.

The totals grow every day, and a slip only takes off what you smoked. When a craving hits, one look at them is often enough, and nothing else on the screen competes for that look.

Setting up the vape track. What do you use? Disposables, pods or tank, how many a week, and what one costs.

Cigarettes, heated tobacco or vapes

Pick what you're quitting first. Heated tobacco is counted in sticks, like cigarettes. Vapes get their own arithmetic, by disposables, pods or liquid, and never an invented "cigarette equivalent".

They get their own pages too. Nobody who quits vaping is told their carbon monoxide has cleared, and every vape page says who the evidence was measured on.

When did you quit? A calendar for September 2026 with the chosen date marked.

Already quit? Start from that day

Pick the date you stopped, up to three years back. Quit21 counts what you haven't smoked since then and what it saved you, and opens every page you've already lived through.

If you're quitting today, it starts counting from the moment you tap the button.

Everything works from the first day

  • No subscription and no locked featuresEvery page, SOS, the diary and both tracks are there from the start. There is no paid tier to unlock.
  • No accountNo sign-up and no login. Your diary, your slips and your reasons stay on your phone.
  • Your money, in your currencyTwenty-seven currencies. The app guesses yours from the phone, one tap changes it, and the price and currency can be edited later in Settings.
  • English and UkrainianEvery screen and every day page exists in both languages. The app follows your phone, and you can switch any time in Settings.
  • Small ads, and you can switch them offA banner at the foot of the home screen, the SOS screen and the diary, never on a day's page or during breathing. A single purchase in Settings removes them for good.
  • No cigarette anywhereNot in the icon, not in the notifications, not on the screen you open during a craving.

Where to get it

  • AndroidOn Google Play now.
  • iOSIn preparation. No date yet.

Get it on Google Play

Questions

What happens if I smoke a cigarette?

You log it, and the total takes off the cigarettes you actually smoked. The day count starts again tomorrow, as Day 1. The money saved, the cigarettes not smoked and every page you've already read stay as they were, and the app says so on screen the moment you log it.

Can I use it if I quit a while ago?

Yes. Pick the date you stopped, up to three years back, and Quit21 counts everything since then straight away. The pages you've already lived through are open to read, and the daily reminders carry on from wherever you are.

Does it work for vaping and heated tobacco?

Yes. Heated tobacco is counted in sticks and follows the cigarette pages. Vaping has its own arithmetic and its own pages, which never mention carbon monoxide or tar and never convert a vape into cigarettes.

How is the money worked out?

From what you tell it. How much you smoked or vaped, what a pack or a device costs, and how long it has been, minus anything you log as a slip. The price is today's price, and you can change it in Settings.

Is it free?

Yes, with nothing held back. There is a small banner at the foot of a few screens, and a single purchase in Settings removes it. It is a one-time purchase, not a subscription.

Do I need an account? What happens to my data?

No account. Your diary, your slips and your reasons are stored on your phone and are never sent to us. On Android the phone's own backup can keep a copy in your Google account, which is what brings your history back on a new phone. The privacy page has the details, including the ad.

Which languages?

English and Ukrainian, both complete. The app follows your phone's language and can be switched in Settings.

Is this medical advice?

No. Quit21 is a tracker and a guide to what quitting usually feels like. It does not diagnose or treat anything. For medication or nicotine replacement, talk to a doctor, a pharmacist or a stop-smoking service.