Comparison

16 vs fast_ Intermittent Fasting

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

Head to head
About

16

Features
Read full description

Intermittent Fasting Tracker 16:8 – A Calmer, Smarter Way to Improve Your Health Are you looking for a simple, natural way to lose weight? Do you want to feel healthier without strict diets, intense workouts, or complicated routines? This Intermittent Fasting Tracker is built to guide you gently, confidently, and effortlessly on your journey to better wellness. Intermittent fasting is one of the most trusted methods to support weight loss and improve your metabolic health. With the right schedule, your body begins burning stored fat, stabilizing energy levels, and repairing cells more efficiently. This app makes fasting easier to understand, easier to follow, and easier to maintain — even if you’re just getting started. Is Intermittent Fasting Right for You? Studies show that structured fasting helps the body rest, reset, and function at its best. It may support insulin sensitivity, reduce inflammation, promote clearer thinking, and help balance your weight naturally. Our app gently guides you through each fasting cycle so you always know what to do next — no pressure, no confusion. Why Users Love This App - Natural Weight Management Lose weight sustainably by letting your body tap into its own energy reserves — no calorie counting needed. - Burn Fat More Efficiently Support fat-burning through well-timed fasting periods that work with your metabolism, not against it. - Better Daily Energy Fasting may improve mental clarity and help you feel more focused throughout the day. - Improve Long-Term Health Consistent fasting has been linked to better digestion, improved blood sugar control, and healthier aging. --- How to Get Started 1. Select how long you want your fasting window to be. 2. Choose from popular plans such as 14:10 (the easy to start), 16:8 (the most popular), 18:6 (the fat burning), 20:4 (the warrior diet), OMAD (one-meal-a-day), and more. 3. Start your fasting timer and let the app guide you with clear progress charts and helpful notifications. That’s it — simple, calm, and manageable for any lifestyle. --- Key Features - Designed for beginners, intermediate, and advanced fasters - Clean, intuitive fasting timer - Popular fasting plans with flexible adjustments - Weight tracking with clear visual trends - Syncs easily with Apple HealthKit - Helpful wellness tips and health articles - Encouraging insights to keep you consistent --- What Makes This Fasting App Different? A Supportive, Easy-to-Follow Experience Start, pause, or adjust your fasting window anytime. See how each cycle affects your body through simple graphs and daily summaries. Balanced, Science-Backed Guidance The app provides practical explanations of what happens during fasting so you understand your progress — without feeling overwhelmed. Track Your Weight & Activity Together Monitor changes in your weight and steps in one place. Clear visuals help you spot patterns and stay motivated. Millions of people practice intermittent fasting every day to feel healthier, lighter, and more in control. With this app, you can join them — calmly, confidently, and at your own pace. Claim: This app is developed for informational purposes only. You must always consult your physician or doctor before starting any diet program. References: - Harvard Health Publishing – “Ketogenic diet: What the science says”: https://www.health.harvard.edu/staying-healthy/ketogenic-diet-what-the-science-says - Mayo Clinic – “Ketogenic diet: A detailed beginner’s guide”: https://www.mayoclinic.org/healthy-lifestyle/weight-loss/in-depth/ketogenic-diet/art-20458606 Privacy policy: https://kahastudio.com/keto-diet-app/policy.html Terms of use: https://kahastudio.com/terms-of-use.html

About

fast_ Intermittent Fasting

This app simplifies intermittent fasting by automatically tracking your eating windows and fast tiers. Log meals, track water intake, and monitor weight trends with a clean, customizable interface. Optional pro features offer advanced meal planning and hydration guidance.

Highlights
  • Automatic fast tracking
  • Clean live timer
  • Meal logging with calories/macros
  • Water intake tracking
  • Weight trend charting
  • Offline functionality
  • Customizable themes
Features
Read full description

Fasting, made simple — and built so you'll actually keep it up. Most fasting apps are cluttered, naggy, and expensive. fast_ is the opposite: open it, log when you eat, and your fasts record and tier themselves — Micro, Mini, Short, Fast, Extended, Deep. No start/stop fiddling, no guilt, no walls. FREE, FOREVER • Auto fasts — just tap "I ate" and the app handles the timing • A clean live timer showing your current tier • Log meals with calories + macros, fully searchable • Water tracking with a daily goal • Weigh-ins with a trend chart • Share a meal with friends or family using a quick code • Works offline — log on the go and it syncs when you're back online • Real stats, streaks, and a 7-day chart • 7 themes, from neon synthwave to clean light, plus a colorblind-friendly palette • Hide any feature you don't use — make it as minimal as you want GO PRO — OPTIONAL • Snap a photo of your plate and the calories + macros fill themselves in • Or just type a meal and it gets estimated for you • Next-meal coach — set a calorie goal and see what to aim for at your next meal • Smart meal ideas matched to your goal and diet style • Eating out? Snap a menu or name the restaurant for dish picks that fit your goal • Weather-smart hydration — your water goal rises on hot days, with heat-safety tips • $9.99/month or $59.99/year (save 50%) Built for people who want something simple, that works, and that won't punish you if you skip a month. No ads. Cancel anytime. Your data stays yours — delete it whenever you want. Start your next fast in two taps. SUBSCRIPTION fast_ Pro is an auto-renewable subscription: Monthly $9.99 or Annual $59.99 (USD; prices may vary by region). Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours before the period ends. Manage or cancel anytime in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aim-env.com/fast/privacy.html

Screenshots

164 screens
fast_ Intermittent Fasting4 screens

Verdict

The call

The clearest difference is update cadence: 16 at every 3 weeks against fast_ Intermittent Fasting's every 4 months. 16 also leads on iOS requirement (14.0 vs 16.4). On price, ads, in-app purchases and device support 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. 16 sells 2 in-app purchases, starting at $4.99 per month and fast_ Intermittent Fasting sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

16 ships an update every 3 weeks, fast_ Intermittent Fasting every 4 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 7 level
16 versus fast_ Intermittent Fasting: the parameters behind the verdict, then further details
Parameter16fast_ Intermittent Fasting
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 3 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better16.4
Further details — not scored
Size86 MB48 MB
Age rating4+4+
DeveloperKAHA INNOVATION COMPANY LIMITEDAtmospheric Integrity Management, LLC

In-app purchases

2 purchases

16

Subscriptions2
  • Monthly Trial7 Days trial$4.991 Month
  • Yearly$19.991 Year
2 purchases

fast_ Intermittent Fasting

Subscriptions2
  • Pro (Monthly)$9.991 Month
  • Pro (Annual)$59.991 Year

Questions

Is 16 free?
16 is free to download, with in-app purchases available.
Is fast_ Intermittent Fasting free?
fast_ Intermittent Fasting is free to download, with in-app purchases available.
Do 16 or fast_ Intermittent Fasting have ads?
Neither 16 nor fast_ Intermittent Fasting shows ads.
Which is updated more often, 16 or fast_ Intermittent Fasting?
16 ships an update every 3 weeks, and fast_ Intermittent Fasting every 4 months. Most recently, 16 was updated on October 30, 2026 and fast_ Intermittent Fasting on October 31, 2026.

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