Comparison

Fasting Tracker vs Shifting Source

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

Head to head
About

Fasting Tracker

Features
Read full description

Track your fasting, understand your body, and build habits that actually stick. Free Fast gives you a clean, distraction-free timer with real insights — streak tracking, weight trends, hydration, HealthKit sync, and more. Key Features: Fasting Timer – Start and stop your fast with one tap. See your elapsed time, fasting stage, and end goal at a glance. The timer keeps running in the background and on your lock screen — always where you need it. Home Screen Widget – Glance at your fasting progress without opening the app. The live widget shows your current stage and time remaining right from your Home Screen. Stats & Trends – Visualize your progress over time. Weekly completion rates, average fasting duration, longest streak, and more — all presented clearly so you actually understand how you're doing. Unlimited History – Every fast you've ever completed, logged and browsable. Filter, review, and reflect on your journey from day one. Custom Protocols – Go beyond 16:8. Build any fasting schedule that fits your life — OMAD, 5:2, custom windows — and save it for one-tap reuse. Per-Day Scheduling – Set different fasting windows for different days of the week. Life isn't uniform, and your protocol doesn't have to be either. HealthKit Sync – Automatically log fasting activity to Apple Health. Your data stays on your device, always private. Hydration & Weight Tracking – Log your water intake and body weight alongside your fasts. See how your habits connect over time. Data Export – Export your full history as a CSV. Your data is yours. Free, No Ads, No Subscription. Free Fast is free to download with no ads and no tracking. The core fasting timer, Home Screen widget, HealthKit sync, and recent history are completely free - forever. A one-time Supporter Unlock  gives you full access to Stats & Trends, Unlimited History, Custom Protocols, Per-Day Schedule, and CSV Export. Pay once, own it forever. Medical Disclaimer
 Free Fast is a personal tracking tool and is not intended to provide medical advice, diagnosis, or treatment. Fasting may not be appropriate for everyone. Always consult a qualified healthcare professional before starting any fasting regimen, especially if you have an existing medical condition, are pregnant, or are taking medication. Privacy 
Free Fast collects no personal data. HealthKit data stays on your device and is never transmitted anywhere. Terms of Use (EULA):
 https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy:
 https://fastif2026.blogspot.com/2026/06/privacy-policy.html

About

Shifting Source

Features
Read full description

Shifting Source brings intermittent fasting and the ketogenic diet together in one app. Built as the companion to the book The Keto & Intermittent Fasting Lifestyle, it follows the same principle: understand why it works, and the results will follow. FASTING TIMER WITH LIVE ACTIVITY • Choose 16:8, 18:6, 20:4, OMAD or your own custom window • Follow your fast right on the Lock Screen and in the Dynamic Island • See which phase your body is in along the way, explained in plain language • Extended fasting (48 to 72 hours) with a mandatory safety check before you start KETO WITHOUT THE HASSLE • Log meals with net carbs, fat and protein • TDEE calculator that gives you personal calorie and macro targets • Daily overview of your carbs against your goal TRAINING AND HABITS • Five exercises with instructions and an easier version of each • Log your sets and reps in seconds, including past days • Weekly challenges that grow with you, streaks and badges • Guided breathing exercises for calm and focus INSIGHTS • Calendar with fasts, meals, workouts and wellbeing day by day • Weight, resting heart rate, HRV and sleep from Apple Health • Trends for energy, mood and hunger over time LEARN WHY • Guides and research articles in English, Danish and Swedish • Excerpts from the book, open to everyone • All content is built on peer reviewed research YOUR DATA IS YOURS • No account and no login • Everything is stored on your device • Health data is never shared with third parties • Export or delete everything with one tap Shifting Source does not provide medical advice. Talk to your doctor before starting fasting or a ketogenic diet, especially if you are pregnant, breastfeeding or have a medical condition.

Screenshots

Fasting Tracker4 screens
Shifting Source4 screens

Verdict

The call

The clearest difference is in-app purchases: Shifting Source at none against Fasting Tracker's 1. Shifting Source also leads on update cadence (every 9 days vs every 2 months). Fasting Tracker's advantage is iOS requirement (17.0 vs 26.0). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Fasting Tracker sells 1 one-off in-app purchase. Shifting Source asks for nothing beyond the download.

UpkeepUpdate frequency

Fasting Tracker ships an update every 2 months, Shifting Source every 9 days. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

Scorecard3 real differences · 3 level
Fasting Tracker versus Shifting Source: the parameters behind the verdict, then further details
ParameterFasting TrackerShifting Source
PriceFreeFree
Update frequencyEvery 2 monthsEvery 9 days — better
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhoneiPhone
Requires iOS17.0 — better26.0
Further details — not scored
Size5 MB9 MB
Age rating4+12+
DeveloperManas Protim DasHejlsvig Consulting AB

In-app purchases

1 purchases

Fasting Tracker

One-time1
  • Supporter$4.99
None

Shifting Source

No in-app purchases

Questions

Is Fasting Tracker free?
Fasting Tracker is free to download, with in-app purchases available.
Is Shifting Source free?
Shifting Source is free to download, with no in-app purchases.
Do Fasting Tracker or Shifting Source have ads?
Neither Fasting Tracker nor Shifting Source shows ads.
Which is updated more often, Fasting Tracker or Shifting Source?
Fasting Tracker ships an update every 2 months, and Shifting Source every 9 days. Most recently, Fasting Tracker was updated on October 7, 2026 and Shifting Source on October 15, 2026.

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