Uncaf vs Fasto
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Uncaf
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Quit caffeine without guessing your symptoms. Uncaf helps you understand withdrawal phases with science, not willpower. Know what's happening in your brain โ and what comes next. 5 RECOVERY PHASES Detox > Peak Reset > Stabilization > Rewiring > Freedom Each phase explains the neuroscience behind your symptoms: why you get headaches (adenosine receptor upregulation), why you feel foggy (dopamine pathway adjustment), and when it gets better (it does). DAILY CHECK-IN Log your mood, energy, and sleep quality in under 2 minutes. Over time, you'll see clear trends showing your recovery progress. CRISIS TOOLS When cravings hit, Uncaf responds instantly: - 4-7-8 Breathing Exercise - calm your nervous system in 60 seconds - Guided meditation and motivation - Distraction activities - Urge tracking with trigger analysis BRAIN FOG GUIDE Understand why brain fog happens during caffeine withdrawal and get actionable tips to manage it - hydration, movement, sleep strategies, and brain-friendly nutrition. YOUR JOURNEY See exactly where you are in your recovery, what's happening in your brain right now, and what the next phase brings. Premium unlocks data-driven personal insights. WEEKLY SUMMARY (Premium) Every Monday, get a snapshot of your week: mood trends, energy levels, sleep improvements, and urges resisted - all compared to the previous week. PROGRESS INSIGHTS (Premium) Beautiful trend charts for mood, energy, and sleep. See week-over-week comparisons and discover patterns (like how better sleep correlates with higher energy). STREAK SHIELD (Premium) Had a slip? Streak Shield protects your streak once per month, so one moment doesn't erase weeks of progress. - WHY UNCAF WORKS - Science-based - Built on caffeine withdrawal research and neuroscience - Phase system - Know exactly what to expect and when - No judgment - Relapses are handled with compassion, not shame - Privacy-first - Your data stays on your device (sync optional) - No ads - Ever - 7-DAY FREE TRIAL Try every feature free for 7 days โ no commitment. After your trial, choose a plan to continue your recovery journey. WHAT'S INCLUDED - Full 5-phase recovery guide with neuroscience - Daily check-ins with mood/energy/sleep tracking - Progress Insights โ trend charts and week-over-week analysis - Your Journey โ phase progress, data-driven advice, next phase preview - Weekly Summary โ Monday reports with trend comparison - Streak Shield โ monthly streak protection - All crisis tools (breathing, meditation, relapse support) - Brain fog guide, withdrawal timeline, daily messages - Full history access and notification customization CRISIS TOOLS โ ALWAYS FREE Breathing exercises, relapse recovery flow, and Brain Fog guide remain accessible even after your trial ends. We never lock you out when you need help most. - Uncaf is a wellness tool and does not provide medical advice. If you experience severe withdrawal symptoms, please consult a healthcare professional. Terms: https://lp.uncaf.app/terms Privacy: https://lp.uncaf.app/privacy
Fasto
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Fasto is an intermittent fasting timer that explains, hour by hour, what is happening inside your body โ and shows you the study behind every claim it makes. WHAT YOU WILL NOT FIND No subscription. No in-app purchases. No ads. No account to create. No analytics and no trackers. And no servers of ours: your fasts live on your iPhone and, if you turn sync on, in your own iCloud. Never in mine. It works offline. SCIENCE WITH ITS SOURCE ATTACHED The eight metabolic phases cite the published work they rest on, with a direct link to PubMed so you can read it yourself. So does the guide on breaking your fast. And where the literature does not support a claim, Fasto does not make it: no miracle promises, no tidy numbers without evidence. WHILE YOU FAST โข An animated ring with your progress, the phase you are in and a countdown to the next one. โข Eight phases from 0 to 72 h: stabilisation, glycogen, gluconeogenesis, early ketosis, full ketosis, autophagy, deep autophagy and immune renewal. โข Tips that change with the phase, a water counter, and an alert as each phase begins. ON YOUR WRIST AND ON YOUR SCREEN โข An Apple Watch app to start and stop from your wrist, plus watch face complications. โข Home Screen and Lock Screen widgets with a button, without opening the app. โข A Live Activity in the Dynamic Island: your fast always in sight. ON ALL YOUR DEVICES Your fasts sync over iCloud between iPhone and iPad. No account and no servers of ours โ it is your iCloud. Change phones and your history is still there. And on iPad it is not the iPhone app stretched out: it has its own two-column layout. Everything scales with Larger Text and works with VoiceOver. WHEN YOU FINISH A summary of what you achieved, the phase you reached, your personal record โ and a guide on how to break the fast based on the hours you lasted, because coming off 14 h and coming off 30 h are nothing alike. YOUR HISTORY, WITH INSIGHTS Total, average and record, plus the patterns behind why you tend to stop, how each fast actually felt, and which durations suit you best. Milestones that add up and are not lost the day you slip. YOUR MEASUREMENTS, NO VERDICTS Log your weight and waist whenever you like and see how they change over 30, 90 or 180 days. Fasto shows the numbers and their variation, with no good-or-bad colours and no punishing streaks. The reading is yours and your doctor's. TO TAKE TO YOUR DOCTOR A PDF report with your period, frequency, adherence and longest fasts, ready to share. If your doctor is going to weigh in on your fasting, let them do it with data. A PLAN FOR EVERY PACE 12:12, 14:10, 16:8, 18:6, 20:4, OMAD and custom. Forgot to hit start? Adjust the time whenever you like. IN SIX LANGUAGES English, Spanish, French, Italian, German and Brazilian Portuguese, switchable inside the app. Light theme, dark theme or follow the system. ONE PAYMENT, FOR LIFE You buy Fasto once and it is yours forever. Every feature and every future update is included. No premium tier, nothing behind a paywall, no renewal reminders. IMPORTANT NOTICE Fasto is an informational and educational tool. It is not a medical device: it does not diagnose, treat, cure or prevent any disease, and it is never a substitute for the judgement of a healthcare professional. ALWAYS consult your doctor before starting any fasting routine. This matters especially if you are pregnant or breastfeeding, if you have or have had an eating disorder, if you have diabetes, kidney or liver conditions, if you are under 18, or if you take medication that must be given with food. Use of this app is the sole responsibility of the user. The developer accepts no responsibility for the decisions you make or for the consequences of applying fasting to your health. If at any point you feel unwell, dizzy or weak, stop fasting and seek medical attention.
Screenshots
Verdict
The clearest difference is price: Uncaf at Free against Fasto's $2.99. Uncaf also leads on iOS requirement (15.1 vs 17.0). Fasto's advantage is in-app purchases (none vs 3) and update cadence (every 2 days vs every 3 weeks). On ads and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Uncaf is free to download; Fasto costs $2.99 up front. Uncaf sells 3 in-app purchases, starting at $9.99 per month. Fasto asks for nothing beyond the download.
Uncaf ships an update every 3 weeks, Fasto every 2 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | Uncaf | Fasto |
|---|---|---|
| Price | Free โ better | $2.99 |
| Update frequency | Every 3 weeks | Every 2 days โ better |
| Ads | No | No |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch โ better |
| Requires iOS | 15.1 โ better | 17.0 |
| Further details โ not scored | ||
| Size | 43 MB | 5 MB |
| Age rating | 12+ | 4+ |
| Developer | Takeaki Shimizu | RAUL JIMENO MARTINEZ |
In-app purchases
Uncaf
- Monthly Plan7 Days trial$9.991 Month
- Annual Plan7 Days trial$29.991 Year
- Lifetime Access$49.99
Fasto
No in-app purchases








