Smoke Free

All three apps share the same core pattern (streak counter, money saved, health milestones), but Smoke Free has the most rigorous evidence base — it was developed in collaboration with University College London's Tobacco Research Group and is one of the few quit apps ever validated in a randomized controlled trial. QuitNow has stronger social features (community feed), Kwit has a more polished gamified UX, and Smoke Free is the choice when you want missions grounded in published quit-smoking science rather than badges and streaks alone.

Smoke Free is free to use forever for the streak counter, money saved, health timeline and basic craving log. The Pro tier costs roughly $24.99/year (or a $59.99 lifetime purchase) and unlocks all 32 evidence-based missions, the full craving science modules, and detailed reports. The free tier is enough for most users to maintain a quit; Pro is best for relapse-prone users who need the structured intervention content. There is no ads-supported tier.

The NHS Quit Smoking app is government-backed, free and UK-focused, with strong NRT (nicotine replacement therapy) guidance and direct links to NHS Stop Smoking Services. Smoke Free is global, has more advanced gamification and richer missions, and is the only quit app with a published RCT in the journal JMIR mHealth and uHealth. UK residents should install both: NHS for clinical pathway, Smoke Free for daily engagement. International users get most of their value from Smoke Free alone.

Yes. The PWA version caches the full mission set and timeline locally, so daily check-ins, craving logs and the timer all work without a connection. Data is stored in IndexedDB; the Pro subscription sync runs through a Firebase backend with standard transport encryption. There is no end-to-end encryption layer — your quit data is technically visible to the developer if subpoenaed. For privacy-strict users (employers monitoring devices, etc.), the offline-only free tier is the safer mode.

Smoke Free is one of the small set of digital interventions with published RCT evidence — the 2018 trial by Ubhi et al. found users of the full Pro version had higher 4-week abstinence rates than control. Real-world effectiveness depends on engagement: users who complete the structured missions during the first month see the strongest outcomes. As of 2024 the app reports 5+ million downloads across native and PWA channels, and it is frequently recommended by NHS Stop Smoking advisors as a self-help adjunct.