JustFast vs Fastix
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JustFast
This app offers a straightforward intermittent fasting timer. It focuses on tracking your fast with a clear, calm interface, providing insights into metabolic stages without gamification or pressure. It prioritizes privacy with on-device data storage and no accounts.
- One-tap start and stop
- Live timer with accurate timekeeping
- Metabolic milestone tracking
- Plain-language explanations of milestones
- Adjustable start/stop times
- Ongoing notification for duration
- Simple history of past fasts
- 18 languages and dark design
Read full descriptionHide full description
Fasting is a beautifully simple intermittent-fasting timer that does one thing well: it tracks your fast. No goals to hit. No streaks to protect. No accounts, no ads, no clutter. Just tap once to begin, and a calm live timer counts your fast while a glowing ring fills toward the next stage your body moves through. WHY IT'S DIFFERENT Most fasting apps pile on dashboards, reminders, and pressure. This one strips fasting back to its essence — a clear timer you can glance at and put away. It's designed to feel quiet and focused, not gamified. WHAT YOU GET • One-tap start and stop, with a big, satisfying button • A live timer that keeps perfect time across restarts, time-zone changes, and daylight saving • Metabolic milestones — the ring fills toward the next stage (blood sugar settling, glycogen burning, fat burning, ketosis, autophagy, and more) • Tap any milestone for an honest, plain-language explanation of what's happening in your body • Forgot to start the timer? Just tap the ring to fix your start time. Forgot to stop? End your fast at the right time after the fact. • An ongoing notification shows your current duration at a glance • A simple history of past fasts — swipe to delete • 18 languages and a clean dark design HONEST BY DESIGN The milestone descriptions are written plainly and honestly. Where the science is still early or based mostly on animal research, we say so. This app is a timer and an educational companion — not medical advice. PRIVATE BY DEFAULT Your data stays on your device. There are no accounts, no sign-ups, no tracking, and nothing is uploaded. Fasting works for 16:8, OMAD, alternate-day, extended fasts, or any schedule you like — because it never forces a schedule on you. Note: Fasting is not a medical device and does not provide medical advice. Talk to a healthcare professional before starting any fasting regimen, especially if you are pregnant, nursing, taking medication, or have a medical condition.
Fastix
Read full descriptionHide full description
Fasting made simple. Start your first fast in seconds: pick a plan, tap the ring, and let Fastix guide the rest. Whether you are brand new to intermittent fasting or you have been doing it for years, Fastix turns it into a calm, sustainable daily routine. No overwhelm, no guilt, no noise. WHY FASTIX - A clean fasting timer you will actually want to open - A personalized plan built from your body data and goals - Private by design: your personal data stays on your iPhone - No ads, no cross-app tracking CHOOSE YOUR PLAN Start with a popular schedule or build your own: - 12/12 - a gentle entry for beginners - 14/10 - an easy daily rhythm - 16/8 - the most popular method - 18/6 and 20/4 - for experienced fasters - Custom - set any fasting window you like A SMARTER START Answer a few quick questions about your body, routine, and goals. Fastix builds a starting plan that fits your real life, then helps you adjust as you go. TRACK WHAT MATTERS - Live fasting timer with a clear progress ring - Fasting history and stage milestones - Weight tracking and trends over time - Streaks and progress analytics to keep you motivated - Hunger notes to learn your own patterns - Gentle reminders so you never miss a window LEARN AS YOU FAST A growing library of expert-written guides explains the how and the why behind fasting: clear, calm, and science-based. Practical knowledge without the hype. DESIGNED FOR REAL LIFE Fastix is built to be quietly dependable: fast to log, easy to read, and respectful of your attention and your privacy. It supports your routine instead of nagging you. FASTIX PREMIUM (PAID SUBSCRIPTION) Fastix is free to download and includes a working fasting timer. Unlocking the full experience requires Fastix Premium, an optional auto-renewing subscription. A purchase is required to access the following features: - All fasting plans, including custom windows - Full fasting history and advanced analytics - The complete premium guides library - Everything, ad-free and private Subscription options: - Annual - $59.99 per year, with a 7-day free trial - Monthly - $9.99 per month, with a 3-day free trial Prices are in US dollars and may vary by region. The exact price is always shown in the app before you confirm your purchase. Payment will be charged to your Apple Account at confirmation of purchase. Your subscription automatically renews unless it is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription in your App Store account settings after purchase. Any unused portion of a free trial is forfeited when you buy a subscription. Terms of Use (EULA): https://docs.google.com/document/d/e/2PACX-1vTMgd72DoWziD0MBjTdBl_1FSBXnrA6xkTieix4pl2ur9rW_FiB8V H_CVOivxqMOIUrhLFj6ABCmnYA/pub Privacy Policy: https://docs.google.com/document/d/e/2PACX-1vR6MgAIjyPB4z56R_02mxoXc-C7kY0A3aMqMlTR90yBY8bxpLOs3CPJkcW FWK-fLS3CKC-hEYEn2RHh/pub Start your fasting routine today, and keep your data where it belongs: with you.
Screenshots
Verdict
The clearest difference is in-app purchases: JustFast at none against Fastix's 2. Fastix's advantage is iOS requirement (16 vs 18.0). On price, ads 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
Both are free to download. Fastix sells 2 in-app purchases, starting at $9.99 per month. JustFast asks for nothing beyond the download.
| Parameter | JustFast | Fastix |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Fortnightly | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.0 | 16 — better |
| Further details — not scored | ||
| Size | 20 MB | 25 MB |
| Age rating | 4+ | 12+ |
| Developer | Vitalii Vyrodov | Danylo Budylkin |
In-app purchases
JustFast
No in-app purchases
Fastix
- Fastix Premium — Monthly3 Days trial$9.991 Month
- Fastix Premium — Yearly Discount7 Days trial$59.991 Year









