Comparison

21in21 vs Intermittent Fasting

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

21in21

This app offers a guided 21-day protocol for personal transformation, with daily steps focusing on psychology, action, and reflection. It provides courses for healing heartbreak, improving fitness, digital detox, better sleep, morning routines, and life resets.

Highlights
  • Guided 21-day transformation protocol
  • Daily actionable steps
  • Courses for various life changes
  • Clean and calming interface
  • Streak tracking
  • Private journaling
  • Daily notifications
Features
Read full description

Do you have 21 days to change your life? 21in21 is not just an app; it’s a guided protocol for personal transformation. Whether you are healing a broken heart, seeking a leaner body, or needing a digital detox, we provide the map. HOW IT WORKS One step a day. For 21 days. We don't overwhelm you with hours of content. We give you: The Psychology: Understanding why you feel this way. The Action: One concrete thing to do today. The Check-in: A moment to reflect and lock in the growth. AVAILABLE COURSES Heal Your Heart: A clinical approach to heartbreak. Move from "grief" to "growth" with CBT-inspired daily protocols. A Leaner You: Reset your relationship with food and movement. No fad diets, just 21 days of sustainable habits. Digital Detox: Reclaim your attention. Break the scroll cycle and rediscover focus in a hyper-connected world. Better Sleep: Master your circadian rhythm. Say goodbye to insomnia and wake up truly refreshed. Morning Routine: Own your morning, own your day. Build a powerhouse routine that sets you up for victory. Life Reset: The ultimate deep-clean for your habits. Audit your life and design a future you’re excited about. FEATURES Clean and calming interface Streak tracking to keep you accountable Private journaling for your reflections Daily notifications to start your day right Start your journey today. It only takes 21 days.

About

Intermittent Fasting

Easily track your intermittent fasting with personalized plans and insights. Monitor progress, stay on schedule, and reach your health goals with a simple interface and helpful tips. Achieve a healthier lifestyle with this comprehensive fasting companion.

Highlights
  • Daily intermittent fasting with 30 plans
  • Tips to maintain fast period
  • Fasting insights & timeline
  • Water, weight & measurement tracker
  • Achievement badges
  • Simple user interface
Features
Read full description

Track your intermittent fasting effortlessly. Whether you are a beginner or an experienced faster, CFast gives you the tools, plans, and insights you need to reach your health goals safely and sustainably. KEY FEATURES YOU’LL LOVE • 30+ Fasting Plans: Choose from beginner-friendly ratios to advanced schedules. • Real-Time Tracker & Timeline: Monitor your current fast stage and body progress at a glance. • Water & Weight Loggers: Keep track of your daily hydration and weight milestones. • Smart Tips & Insights: Stay motivated with actionable guidance during your fasting windows. • Achievement Badges: Celebrate your streaks and build long-lasting habits. • Clean & Simple UI: Start or end a fast with a single tap. SUPPORT FOR ALL FASTING PROTOCOLS • Daily Ratios: 12:12, 14:10, 16:8, 18:6, 20:4, and 23:1 (OMAD) • Extended Fasts: 24 to 48-hour tracking options • Weekly Schedules: 5:2 and 4:3 custom schedules CFAST PREMIUM Unlock the full potential of your health journey with CFast Premium: • Access to all 30+ daily and weekly fasting plans • Full recipe library tailored for post-fast nutrition • Exclusive fasting challenges and advanced insights WHAT IS INTERMITTENT FASTING? Intermittent fasting is an eating pattern alternating between periods of eating and fasting. Rather than restricting what you eat, it focuses on when you eat—helping promote metabolic health, fat burning, and energy balance. DISCLAIMER CFast is intended for general wellness and informational purposes only and does not provide medical advice or diagnosis. Always consult a healthcare professional before starting an extended fast (over 24 hours) or if you have underlying medical conditions. Privacy Policy: https://cfastapp.co.in/privacy-policy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

21in214 screens
Intermittent Fasting4 screens

Verdict

The call

The clearest difference is rating: 21in21 at 5.0 against Intermittent Fasting's 4.5. 21in21 also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). Intermittent Fasting's advantage is update cadence (every 4 days vs every 8 days). On price, ratings volume, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. 21in21 sells 6 one-off in-app purchases and Intermittent Fasting sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

21in21 holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

UpkeepUpdate frequency

21in21 ships an update every 8 days, Intermittent Fasting every 4 days. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 5 level
21in21 versus Intermittent Fasting: the parameters behind the verdict, then further details
Parameter21in21Intermittent Fasting
PriceFreeFree
Rating5.0 (1 ratings) — better4.5 (2 ratings)
Number of ratings12 — better
Update frequencyEvery 8 daysEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size42 MB35 MB
Age rating17+4+
DeveloperDiego GomezJitender Kumar

In-app purchases

6 purchases

21in21

One-time6
  • Heal Your Heart$21.00
  • A Leaner You$21.00
  • Morning Routine$21.00
Show 3 more
  • Life Reset$21.00
  • Better Sleep$21.00
  • Digital Detox$21.00
3 purchases

Intermittent Fasting

Subscriptions3
  • Buy Monthly Subscription$1.991 Month
  • 3 Month Subscription$4.993 Months
  • Yearly Subscription3 Days trial$8.991 Year

Questions

Is 21in21 free?
21in21 is free to download, with in-app purchases available.
Is Intermittent Fasting free?
Intermittent Fasting is free to download, with in-app purchases available.
Which has better reviews, 21in21 or Intermittent Fasting?
21in21 is rated higher. 21in21 averages 5.0 out of 5 from 1 ratings, while Intermittent Fasting averages 4.5 from 2 ratings.
Do 21in21 or Intermittent Fasting have ads?
Neither 21in21 nor Intermittent Fasting shows ads.
Which is updated more often, 21in21 or Intermittent Fasting?
21in21 ships an update every 8 days, and Intermittent Fasting every 4 days. Most recently, 21in21 was updated on October 21, 2026 and Intermittent Fasting on October 25, 2026.

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