Comparison

Cairn vs Fastly Fasting Tracker

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

Head to head
About

Cairn

Features
Read full description

Cairn is a calm, private place to track your sobriety and celebrate each day forward. It's a support tool for your own journey โ€” not treatment, and not a substitute for professional help. Free, forever: - Sober day counter that keeps going as long as you do - One-tap daily check-in - Milestones and gentle celebrations as you climb - Stats: days sober, money saved, and a calendar of your journey - Private mood and craving journaling Reflection (optional upgrade): - Gentle, non-clinical observations about patterns in your moods and cravings - A weekly reflective summary - Unlimited journal history Private by design: Your streak, check-ins, stats and journal stay on your device. Nothing is sold or shared. Only the reflection entries you choose are sent securely for processing. If you are in crisis, Cairn includes crisis resources โ€” and always encourages reaching out to professional help. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://mike43-ai.github.io/cairn-legal/privacy/

About

Fastly Fasting Tracker

Features
Read full description

Lose weight and take control of your eating with Fastly โ€” the complete intermittent fasting tracker with no subscription. Start a fast in one tap and watch a beautiful timer reveal exactly what your body is doing right now: fat-burning, ketosis, and autophagy. Follow any schedule, track your weight and progress, build streaks, and stay motivated โ€” with no $70/year subscription. Most fasting apps lock the features that keep you consistent behind an expensive paywall. Fastly gives you everything, with no paywall. LIVE FASTING STAGES See your body move through each stage as your fast progresses โ€” fed, fat-burning, ketosis, autophagy, and growth hormone. Know exactly when you'll reach the next stage and what it does for your body. It's the motivation that gets you through the hard hours. A TIMER YOU CAN TRUST One-tap start and stop. A glowing ring fills as you fast and shifts color with each stage. Your elapsed time stays exact after backgrounding, a reboot, or a phone restart โ€” because a wrong timer is the fastest way to quit. EVERY SCHEDULE INCLUDED 16:8, 18:6, 20:4, OMAD (23:1), 14:10, 12:12, 5:2, Warrior, Circadian, and fully custom. Beginner to advanced โ€” switch anytime and set a recurring weekly plan. SEE YOUR RESULTS Log your weight and watch the trend move toward your goal. Track BMI, body measurements, fasting hours, average fast length, and completion rate with beautiful charts. STAY MOTIVATED Build streaks, take on challenges, earn milestones, and beat your longest fast. Visible progress is what keeps you going. WATER AND REMINDERS Track hydration and get calm, motivating reminders: a heads-up an hour before each new fasting stage, a cue when your fast is complete and your eating window opens, and one before it closes. LEARN AS YOU FAST Built-in guidance on fasting benefits, what breaks a fast, the science of the stages, and beginner tips โ€” no paywall. NO SUBSCRIPTION, NO PAYWALL All fasting protocols, live stages, weight and progress tracking, streaks, challenges, water, reminders, and content are all included. No subscription, no "shell" tier. Whether you're starting your first 16:8 or chasing autophagy on OMAD, Fastly gives you the complete toolkit to lose weight, burn fat, and feel great through intermittent fasting. Download Fastly and start your first fast today โ€” no subscription needed. Fastly is not a medical device and does not provide medical advice. Talk to your doctor before starting any fasting or weight-loss program.

Screenshots

Cairn4 screens
Fastly Fasting Tracker4 screens

Verdict

The call

The clearest difference is in-app purchases: Fastly Fasting Tracker at none against Cairn's 2. Cairn's advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Cairn sells 2 in-app purchases, starting at $4.99 per month. Fastly Fasting Tracker asks for nothing beyond the download.

Scorecard2 real differences ยท 4 level
Cairn versus Fastly Fasting Tracker: the parameters behind the verdict, then further details
ParameterCairnFastly Fasting Tracker
PriceFreeFree
Update frequencyโ€”Every 3 months
AdsNoNo
In-app purchasesYesNo โ€” better
DevicesiPhone, iPodiPhone, iPad, iPod โ€” better
Requires iOS13.0 โ€” better15.0
Further details โ€” not scored
Size44 MB46 MB
Age rating17+4+
DeveloperHuy NguyenGunawan Santoso

In-app purchases

2 purchases

Cairn

Subscriptions2
  • Cairn Reflection Monthly14 Days trial$4.991 Month
  • Cairn Reflection Annually14 Days trial$39.991 Year
None

Fastly Fasting Tracker

No in-app purchases

Questions

Is Cairn free?
Cairn is free to download, with in-app purchases available.
Is Fastly Fasting Tracker free?
Fastly Fasting Tracker is free to download, with no in-app purchases.
Do Cairn or Fastly Fasting Tracker have ads?
Neither Cairn nor Fastly Fasting Tracker shows ads.

Other comparisons