21 Days vs ByeByeSugar!
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
21 Days
Read full descriptionHide full description
Build habits that actually stick β 21 days at a time. 21 Days Challenge is a simple and powerful habit tracker designed for real, lasting change. Pick a goal, commit for 21 days, check in daily, and watch your streak grow one day at a time. Whether you want to drink more water, read every day, exercise, meditate, or build any daily routine, 21 Days Challenge keeps you focused, motivated, and consistent. KEY FEATURES β’ Multiple Habit Challenges Track several habits at once including health, fitness, learning, productivity, mindfulness, and more β all from one home screen. β’ Streaks & Milestones Watch your streak grow daily. Reach milestones at Day 7 and Day 14, and unlock badges as you build consistency. β’ Daily Journal Add quick notes, moods, or reflections with each check-in. Discover patterns and understand what works best for you. β’ Insightful Stats View beautiful charts showing completion rates, mood trends, and overall progress. β’ Smart Reminders Set custom reminders for each challenge at the times that work best for you. β’ Private by Default Your data stays on your device. Optional cloud sync is designed with privacy in mind. HOW IT WORKS 1. Pick your challenge β choose a suggested habit or create your own 2. Check in daily β track progress with a single tap 3. Build momentum β strengthen routines through consistency BUILT FOR EVERY KIND OF GROWTH β’ Health & fitness β water, sleep, movement β’ Learning & focus β reading, studying, skill-building β’ Productivity β deep work, discipline, routines β’ Mindfulness & wellness β meditation, gratitude, journaling β’ Creativity β writing, drawing, creating β’ Personal goals β anything that matters to you Start your first 21 days today with 21 Days Challenge β your habit tracker, streak builder, and daily journal for lasting change. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
ByeByeSugar!
Read full descriptionHide full description
ByeByeSugar helps you break the added sugar habit with one simple system: commit to a challenge, check in every day, and stay accountable. No calorie counting. No meal plans. No endless tracking. Just a clear goal and a daily check-in that keeps you honest. How it works * Choose a 7, 14, or 30-day challenge * Spend credits to start and make the commitment real * Check in each day to confirm you stayed off added sugar * Finish the challenge and earn your credits back so you can keep going Daily Briefings * Every day, you get a short, evidence-based briefing on what added sugar does to your body, tailored to your goal. Briefings are built from trusted sources such as the CDC, WHO, and peer-reviewed research. Achievements * Unlock badges as you build consistency, see how rare each one is, and share the milestones youβre proud of. Clear sugar rules * ByeByeSugar focuses on added sugar, not naturally occurring sugar. Whole fruit, plain milk, and similar foods are not the target. The app gives you clear rules so you always know where you stand. Built for focus * No social feed. No subscription. Just a challenge, a daily check-in, and a reason to keep going. Start with 2 free credits. Your first challenge is on us.
Screenshots
Verdict
The clearest difference is update cadence: ByeByeSugar! at every 5 days against 21 Days's every 3 weeks. 21 Days's advantage is iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. 21 Days sells 4 in-app purchases, starting at $0.99 per month and ByeByeSugar! sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
21 Days ships an update every 3 weeks, ByeByeSugar! every 5 days. The most recent releases landed on September 10, 2026 and September 14, 2026 respectively.
| Parameter | 21 Days | ByeByeSugar! |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 5 days β better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPod β better | iPhone |
| Requires iOS | 15.0 β better | 17.6 |
| Further details β not scored | ||
| Size | 42 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | iLoma Technology Private Limited | Sezgin Ege |
In-app purchases
21 Days
- Pro Monthly$0.991 Month
- Ultra Pro Monthly$0.991 Month
- Pro Yearly$4.991 Year
Show 1 moreShow fewer
- Ultra Pro Yearly$9.991 Year
ByeByeSugar!
- Starter Credits$3.99
- Momentum Credits$8.99
- Deep Run Credits$14.99









