Comparison

Lean SL vs Fasting Mastery

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

Head to head
About

Lean SL

Features
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Losing weight isn't only about exercise. A proper diet, sleeping habits, medical conditions are to be considered too. So what would do the trick?ย  We know how much losing weight means to you. However, it should be done methodically. Gradual & steady workouts & a diet plan, adopting healthy lifestyle habits and you are almost there. LeanSL will help you create a personalized plan that lets you reap the benefits.

About

Fasting Mastery

Features
Read full description

You fasted for 14 hours yesterday. You just don't know it yet. Fasting Tracker shows you exactly where you are in your fast โ€” right now, in real time. No meal plans. No food databases. No judgment. Just the clock, the phase you're in, and a little nudge to keep going. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://lavender-utahraptor-b7c.notion.site/Privacy-policy-2f68fbc25c0f80b293d0fba19d8ba7a5 YOUR FAST, LIVE - See your fasting duration tick up every second โ€” Fat Burning, Autophagy, whatever phase you're chasing - Log your last meal in 3 taps. Seriously. Three. - Quick presets: Now, 15m ago, 1h ago โ€” because nobody wants to type the exact time they ate a biscuit STAY HYDRATED, STAY FASTING - Log every sip with quick presets and your own custom "My cup" size - Live hydration score shows how you're doing over the last 24 hours โ€” full tank means you nailed it - A dedicated water page: today's intake, weekly bars, hourly patterns, and a confidence range that sharpens as you log - Water never breaks your fast โ€” it has zero calories, so the clock keeps running while you stay topped up DATA THAT ACTUALLY TELLS YOU SOMETHING - 24-hour timeline cards: see your fasting vs eating windows painted across every day of the week - Phase stacked bar chart: find out which fasting phase you're actually spending time in - Insights screen: your streak, your personal best, your eating window, your program match โ€” all in one scroll - Calorie breakdown by meal type with your personal BMR as a reference line (optional body profile) - Filter your history by Water, Food, or Alcohol with a single tap YES, ALCOHOL LOGGING TOO - Log drinks from 11 types: Lager, Red Wine, Spirits, Cocktails and more - Automatic calorie calculation from ABV and serving size - Real-time Blood Alcohol Level estimate with dissolution curve, drink-event markers, and predicted sober time - It participates in your fasting clock, because biology doesn't take the night off BUILD STREAKS THAT ACTUALLY STICK - Auto-detected fasting patterns (16:8, 18:6, 20:4 and more) - Week-over-week trend arrows โ€” is your fast getting longer or slipping? - Personal best tracker โ€” your longest fast, sitting there daring you to beat it - Fasting program comparison: see how close you actually are to your goal - YOUR DATA, EVERYWHERE - Works 100% offline โ€” no account needed to start - Optional cloud sync via Google Sign-In โ€” your history (water included) follows you across devices - Cloud backup and restore โ€” nothing gets lost No guilt. No streaks of shame. No diet culture. Just your data, honestly. And a very satisfying timer going up. Download free. Start your fast.

Screenshots

Lean SL4 screens
Fasting Mastery4 screens

Verdict

The call

The clearest difference is in-app purchases: Lean SL at none against Fasting Mastery's 3. Fasting Mastery's advantage is update cadence (every 4 days vs monthly). On price, ads, device support and iOS requirement 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. Fasting Mastery sells 3 in-app purchases, starting at $1.99 per month. Lean SL asks for nothing beyond the download.

UpkeepUpdate frequency

Lean SL ships an update monthly, Fasting Mastery every 4 days. The most recent releases landed on September 25, 2026 and September 11, 2026 respectively.

Scorecard2 real differences ยท 4 level
Lean SL versus Fasting Mastery: the parameters behind the verdict, then further details
ParameterLean SLFasting Mastery
PriceFreeFree
Update frequencyMonthlyEvery 4 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPodiPhone, iPad, iPod โ€” better
Requires iOS13.013.0
Further details โ€” not scored
Size101 MB73 MB
Age rating12+12+
DeveloperAZBOWYasiru Abeygunawardana

In-app purchases

None

Lean SL

No in-app purchases

3 purchases

Fasting Mastery

Subscriptions3
  • Monthly$1.991 Month
  • Quarterly$2.993 Months
  • Annual$9.991 Year

Questions

Is Lean SL free?
Lean SL is free to download, with no in-app purchases.
Is Fasting Mastery free?
Fasting Mastery is free to download, with in-app purchases available.
Do Lean SL or Fasting Mastery have ads?
Neither Lean SL nor Fasting Mastery shows ads.
Which is updated more often, Lean SL or Fasting Mastery?
Lean SL ships an update monthly, and Fasting Mastery every 4 days. Most recently, Lean SL was updated on September 25, 2026 and Fasting Mastery on September 11, 2026.

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