Full disclosure: we make Klar, so we're biased. To keep this comparison fair, every rating, price and feature below comes from each app's US App Store listing as we read it on October 29, 2026, and every claim about cravings and slips comes from the anonymized data of 1,437 people who shared their Klar data for our research.
Short answer: for a cannabis-specific plan built on withdrawal science, Klar. For a simple cannabis tracker with a big user base, Grounded. For watching your health recover, Quit Weed. For a 30-day tolerance break with a community, Clear30. If you're quitting more than weed, I Am Sober. If you want an app with no in-app purchases at all, Nomo.
The 7 Apps Side by Side
All seven are free to download on the App Store. The table shows what each listing says the app does, what the paid tier costs in the US, and the US rating with the number of ratings in brackets.
| App | Built for | Guidance | Craving help | Community | Paid tier (US) | US rating |
|---|---|---|---|---|---|---|
| Klar | Cannabis | 90-day plan, daily symptom check-in | Breathing, calming mini-game | – | $12.99/mo · $39.99/yr | 4.4 (14) |
| Grounded | Cannabis (also vaping) | What to expect in the first days | Urge log, weed journal | – | $9.99/mo · $39.99/yr | 4.8 (5,792) |
| Quit Weed | Cannabis | 6-week guide, 30+ health badges | SOS button | – | Pro: $4.99–$24.99 | 4.9 (2,010) |
| Clear30 | Cannabis breaks | 30-day T-break program | Daily meditations | ✓ | $4.99–$9.99/mo · $19.99–$49.99/yr | 4.7 (3,166) |
| I Am Sober | Any addiction | Daily pledge, trigger review | – | ✓ | $9.99/mo · $39.99/yr | 4.9 (189,933) |
| Sober Time | Any addiction | Goals, daily messages | – | ✓ forum | $4.99/mo · $29.99/yr | 4.9 (43,094) |
| Nomo | Any habit | Daily check-ins, journal | Refocus exercises, alert a partner | ✓ | No in-app purchases | 4.8 (16,843) |
Ratings and prices: US App Store, October 29, 2026. Klar launched in January 2026 and most of its ratings come from Germany, where it holds 4.6 stars from 105 ratings. Head-to-head pages: Klar vs Grounded, Klar vs Quit Weed, Klar vs I Am Sober, Klar vs Sober Time, Klar vs Nomo.
What a Quit-Weed App Has to Do
A good quit-weed app helps you at the moments quitting actually fails: in the evening, in the first three days, and in the middle of a craving. That's what the data from 1,437 people quitting with Klar shows, and it's a better test than a feature list.
1. It has to be there in the evening. Cravings aren't spread evenly over the day. They build through the afternoon and peak at night, when the old ritual used to happen. An app that only checks in each morning misses the hardest hours.
Hour of day a craving was logged in the app. Peak: 8 pm with 68 cravings. Source: Klar Data Report 2026.
Show data as table
| Hour | Cravings |
|---|---|
| 12 am | 22 |
| 1 am | 8 |
| 2 am | 9 |
| 3 am | 1 |
| 4 am | 0 |
| 5 am | 2 |
| 6 am | 6 |
| 7 am | 10 |
| 8 am | 17 |
| 9 am | 38 |
| 10 am | 30 |
| 11 am | 53 |
| 12 pm | 33 |
| 1 pm | 35 |
| 2 pm | 46 |
| 3 pm | 42 |
| 4 pm | 55 |
| 5 pm | 52 |
| 6 pm | 48 |
| 7 pm | 62 |
| 8 pm | 68 |
| 9 pm | 47 |
| 10 pm | 50 |
| 11 pm | 51 |
2. It has to carry you through the first days. Withdrawal peaks around day 3, and most first slips happen before the end of the first week. An app that explains what's normal right now (the sleep problems, the irritability, the flat weeks that come after) matters most at the start.
Share of people whose first logged slip came by that day. Median: day 2. Source: Klar Data Report 2026.
Show data as table
| Period | People | Share |
|---|---|---|
| by day 3 | 69 of 98 | 70 % |
| by day 7 | 77 of 98 | 79 % |
| by day 14 | 84 of 98 | 86 % |
3. It has to help during a craving, not just count days. A craving feels like it will only get worse. It doesn't. Most cravings that people logged with an outcome passed without using. A tool that gets you through the next few minutes, like craving surfing, a breathing exercise or a message to a friend, is worth more than a bigger counter.
Only cravings where the outcome was logged (270 of 785). Source: Klar Data Report 2026.
Show data as table
| Outcome | Cravings | Share |
|---|---|---|
| Passed | 209 | 77 % |
| Ended in using | 61 | 23 % |
4. It should know cannabis. Cannabis withdrawal has its own timeline and its own symptoms, and sleep problems and vivid dreams are the symptoms that hang on longest. Generic sobriety apps track days well but can't tell you why night five feels the way it does. For the numbers behind your own first weeks, the free withdrawal calculator forecasts your symptom timeline and the THC detox calculator estimates when you'd test clean.
5. It should treat your data with care. Recovery data is sensitive. Check whether you can use the app without a public profile and delete everything when you want to.
1. Klar: Best for a Science-Based 90-Day Plan
Klar is a cannabis-only app that walks you through a 90-day plan in three phases (detox, rebuild, thrive), with a daily check-in for withdrawal symptoms, short science-based lessons, and tools for the moment a craving hits. It's available on iOS and Android in English, German, Spanish, French and Portuguese.
Price: free assessment, then a subscription ($12.99 a month or $39.99 a year in the US)
US rating: 4.4 from 14 ratings (4.6 from 105 in Germany)
Built for: quitting weed or taking a tolerance break
Every feature, the pricing and an FAQ are on one page: the Klar quit weed app.
What It Does Well
- Built only for cannabis. The 90-day timeline, the lessons and the symptom guidance all follow cannabis withdrawal research, not a generic addiction model.
- Withdrawal check-in. A daily check-in for eight core withdrawal symptoms (cravings, sleep, vivid dreams, irritability, anxiety, brain fog, appetite and physical discomfort), shown against the typical recovery curve so you know what's normal.
- Brain recovery view. A model of dopamine and CB1 receptor recovery based on published brain-imaging studies, personalized to how long and how you used.
- Craving tools. Breathing exercises and Dawnrunner, a calming mini-game for riding out an urge.
- Lessons that fit the day. A short lesson for a heavy day, a slip or a rough symptom, instead of the same daily quote for everyone.
- Motivation that sticks. Collectible milestone cards, money saved, a nightly one-line identity ritual and a pinned "why".
Where It Falls Short
- No community. It's a private tool, not a social network.
- Most features need the subscription after the free assessment.
- It's new: only 14 US ratings so far.
Best For
People who want to understand what's happening in their body and brain, and want a plan for each phase instead of a counter. Especially useful if you've tried to quit before.
Try Klar free
Cannabis-specific symptom tracking, a 90-day recovery timeline, and CB1 brain-recovery visualization — built only for quitting weed. On iPhone and Android.
2. Grounded: Best Simple Cannabis Tracker
Price: free, Grounded Plus $9.99 a month or $39.99 a year
US rating: 4.8 from 5,792 ratings
Built for: quitting weed, tolerance breaks, also vaping
What It Does Well
- Cannabis-specific and established. On the App Store since 2019, with more ratings than any other cannabis-only app in this list.
- Clean-time counters. Sobriety clocks and a days-clean tracker are the core of the app.
- Urge log and weed journal. Record urges and notes to spot your triggers.
- Tolerance breaks. Works for a short break as well as for quitting for good.
Where It Falls Short
- No community features in its listing.
- The listing describes what to expect in the first days, not a longer withdrawal timeline.
- Less recently updated than the others here (last update August 28, 2026).
Best For
People who want a straightforward weed counter with a journal and don't need a structured program. Klar vs Grounded compares the two in detail.
3. Quit Weed: Best for Watching Your Body Recover
Price: free, Quit Weed Pro from $4.99
US rating: 4.9 from 2,010 ratings
Built for: quitting weed
What It Does Well
- Health badges. More than 30 science-based badges in four groups (detox, body, mind, lungs) that show what may be improving now and what comes next.
- A guide for the first six weeks. Three phases with tips and the withdrawal symptoms to expect in each.
- An SOS button for the moment a craving hits.
- Sources in the app. Its listing says the research behind it can be opened right in the app.
Where It Falls Short
- No community features in its listing.
- Its guide covers the first six weeks, not the months after.
Best For
People motivated by seeing their health improve week by week. The cheapest paid tier in this list. Klar vs Quit Weed has the details.
4. Clear30: Best for a 30-Day Tolerance Break
Price: free to start, then a subscription (several price points: $4.99 to $9.99 a month, $19.99 to $49.99 a year)
US rating: 4.7 from 3,166 ratings
Built for: a 30-day break from weed, with an option to keep going
What It Does Well
- A structured 30-day program with a preparation guide, personalized daily messages and feedback based on your use.
- Community. Access to the Clear30 community, plus links to Reddit threads and YouTube videos from people on the same path.
- Meditations and education on withdrawal, triggers, cravings and mental health, and an AI assistant for tips.
- A video journal to document your patterns.
Where It Falls Short
- It describes itself as a subscription-based app: the program needs the subscription.
- Built around a 30-day break first; long-term support is a separate program you can enroll in afterwards.
Best For
People who want to take a month off rather than commit to quitting forever, and who like a community around them.
5. I Am Sober: Best for Quitting More Than Weed
Price: free, subscription $9.99 a month or $39.99 a year
US rating: 4.9 from 189,933 ratings
Built for: any addiction
What It Does Well
- The biggest community of any app here, with milestone stories from people at the same point as you.
- A daily pledge in the morning and a review at night.
- Trigger analysis that recaps each day to find patterns.
- Several trackers if you're quitting alcohol or nicotine at the same time.
Where It Falls Short
- Not cannabis-specific: no cannabis withdrawal timeline or symptom guidance.
- No in-the-moment craving tool in its listing.
Best For
People quitting several substances at once or who want a large community. Klar vs I Am Sober compares the two.
6. Sober Time: Best Low-Cost Community
Price: free, Premium $4.99 a month or $29.99 a year
US rating: 4.9 from 43,094 ratings
Built for: any addiction
What It Does Well
- A community forum you can read anonymously without an account.
- Unlimited trackers with goals, daily motivational messages and relapse notes.
- Money saved and more than ten display modes for your clean time.
Where It Falls Short
- Not cannabis-specific: no withdrawal guidance.
- No craving tool in its listing.
Best For
People who want a flexible counter and a forum at a low price. Klar vs Sober Time has the details.
7. Nomo: Best Completely Free App
Price: free, no in-app purchases listed
US rating: 4.8 from 16,843 ratings
Built for: any habit
What It Does Well
- Accountability partners. Find a partner, share chosen clocks and send them an alert when you're tempted.
- Refocus exercises and small games for the moment you're tempted.
- Unlimited sobriety clocks, private by default, plus milestone tokens, a journal and daily check-ins.
Where It Falls Short
- Not cannabis-specific.
- The accountability features need another person to be involved, which isn't always an option.
Best For
People with a trusted friend, sponsor or therapist who want that person in the loop, at no cost. Klar vs Nomo compares the two.
Do Quit-Weed Apps Actually Work?
They help a little, on average, and some apps are much better than others. A meta-analysis of 20 digital treatment programs for cannabis found they reduced use compared with control groups right after treatment, with a small effect (Boumparis et al., Drug and Alcohol Dependence, 2019). The effect was no longer significant at long-term follow-up.
The quality of the apps themselves varies. When researchers at the University of Toronto and the Centre for Addiction and Mental Health searched both app stores for free cannabis-cessation apps, only four qualified, among them Grounded and Quit Weed. Each was used for at least a month and scored 3.4 out of 5 on average, weakest on evidence-based information (Seth et al., JMIR mHealth and uHealth, 2026). Their search ran in April 2023, before Klar and Clear30 were on the App Store.
So treat an app as one part of your plan, not the whole plan. The strongest evidence for cannabis use disorder is for talk therapy, especially cognitive behavioral therapy and motivational enhancement therapy (Gates et al., Cochrane Review, 2016). An app is good at what therapy can't do: being there at 8 pm on day 3. For the plan around it, read our science-backed guide to quitting weed.
What Is the Most Popular App to Quit Weed?
By number of App Store ratings, I Am Sober is the most popular sobriety app (189,933 US ratings), but it isn't made for cannabis. Among cannabis-only apps, Grounded has the most ratings (5,792), followed by Clear30 (3,166) and Quit Weed (2,010).
Popularity tells you an app is maintained and liked. It doesn't tell you whether it fits cannabis withdrawal. All seven apps here rate between 4.4 and 4.9 stars, so the ratings barely separate them; the features do.
Is There a Free App to Quit Weed?
Yes. All seven apps are free to download, and Nomo has no in-app purchases at all. The others keep a free core (usually a counter and basic tracking) and charge for the full program: from $4.99 for Quit Weed Pro and Sober Time Premium up to $39.99 a year for Klar, Grounded Plus and I Am Sober.
Klar starts with a free assessment of your use. Free tools that work without any app: the withdrawal calculator and the THC detox calculator.
Which App Is Right for You?
You want to understand your withdrawal and follow a plan: try Klar. It's the one built around the cannabis recovery timeline, from the first days to day 90.
You want a simple weed counter: Grounded, or Quit Weed if seeing your health improve motivates you.
You want a 30-day break, not forever: Clear30.
You're quitting several things at once: I Am Sober.
You want people around you: I Am Sober or Sober Time for a community, Nomo for one accountability partner.
You don't want to pay anything: Nomo.
If you already know you want the science-based option, the Klar app page shows how it works day to day.
Beyond Apps: What Else Helps
No app replaces people. If you're struggling, these help too:
- r/leaves, one of the largest online communities of people quitting cannabis. Free and active around the clock.
- Marijuana Anonymous, a 12-step program with online and in-person meetings.
- SMART Recovery, a science-based alternative to 12-step programs, with online meetings.
- Therapy with someone who specializes in substance use. Ask about CBT and motivational enhancement therapy.
- SAMHSA National Helpline: 1-800-662-4357, free, confidential, 24/7. In a crisis, call or text 988.
The best app is the one you'll actually open on day 3 at 8 pm. Pick one today, set your quit date, and start.
