Comparison

Empty vs Fast 16

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

Head to head
About

Empty

This app helps you track various fasting methods, including intermittent, circadian rhythm, and custom plans. It provides smart reminders and detailed progress views to support your health goals.

Highlights
  • Intermittent Fasting Tracking
  • Circadian Rhythm Fasting
  • Custom Fasting Plans
  • Smart Reminders
  • Progress Visualization
  • Fasting History
Features
Read full description

Empty is a simple and intuitive fasting tracker used for Intermittent, Circadian Rhythm, and Custom fasting. Choose your favorite fasting type and Empty will track and remind your ongoing progress. Empty supports the following fasting types: 16-Hour Intermittent Fasting (16/8): Popularized by Hugh Jackman (Wolverine) as a efficient way to remove extra weight. 16/8 fasting means eating within a window of eight hours each day such as from 12pm to 8pm and not eating during the remaining 16 hours. It helps get us into the sweet metabolic state of fat burning called Ketosis. Circadian Rhythm Fasting: Based on the research of Dr. Satchin Panda, the confining caloric consumption to about 12-hour period as people did just a century ago. It helps staving off high cholesterol, diabetes and obesity. Custom Fasting: Setup a custom program to meet your fasting goals. You choose your fasting hours per day, and days per week. Features: + Create Custom Fast + Smart Reminder (Remind you when your fasting completes even when the app is turn off) + Create your own custom alarms to fast + View the progress of the current fast + Show the full detail of your fasting days + Show the recent 7 fasts in chart and list + Get the average fasting time right in the Main Interface + Get the total hours of fasting in the Main Interface

About

Fast 16

This app helps you track your fasting periods with a built-in timer and helpful reminders. It provides detailed statistics on your fasting habits and offers resources to learn about healthy fasting practices.

Highlights
  • Fasting timer
  • Fasting reminders
  • Detailed fasting statistics
  • Healthy fasting resources
  • Weight tracking
Features
Read full description

Being healthy is your goal? Start fasting with this app. Features - Easier to track your fasting with timer. - Reminder helps you know your time for fasting. - Detailed stats let you understand your fasting habit. - Learn to fast healthily from useful resources Download now and start fasting healthily today.

Screenshots

Empty4 screens
Fast 163 screens

Verdict

The call

The clearest difference is review sentiment: Empty at 70% against Fast 16's 0%. Empty also leads on rating (4.5 vs 2.5) and ratings volume (95 vs 2). Fast 16's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 6 months). On price, in-app purchases, monetization model 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. Empty sells 1 one-off in-app purchase and Fast 16 sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Empty holds the better App Store score, 4.5 against 2.5. That said, the two scores are not equally well evidenced: Empty has 95 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 70% of Empty's written reviews are positive against 0% of Fast 16's.

UpkeepUpdate frequency

Empty ships an update every 6 months, Fast 16 every 3 weeks. The most recent releases landed on September 26, 2026 and September 18, 2026 respectively.

Scorecard6 real differences · 4 level
Empty versus Fast 16: the parameters behind the verdict, then further details
ParameterEmptyFast 16
PriceFreeFree
Rating4.5 (95 ratings) — better2.5 (2 ratings)
Positive reviews70.0% of reviews — better0.0% of reviews
Number of ratings95 — better2
Update frequencyEvery 6 monthsEvery 3 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.611.0 — better
Further details — not scored
Size14 MB21 MB
Age rating4+4+
DeveloperThang NguyenAtthaporn Chanprakon

Customer experience

Empty

All ratings95 ratings
Positive86.3%
Neutral6.3%
Negative7.4%
Written reviews10 reviews
Positive70.0%
Neutral0.0%
Negative30.0%

Fast 16

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews4 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Empty

One-time1
  • Pro Upgrade$4.99
2 purchases

Fast 16

One-time2
  • Pro Version$2.99
  • Fasting Pro Version$5.99

Questions

Is Empty free?
Empty is free to download, with in-app purchases available.
Is Fast 16 free?
Fast 16 is free to download, with in-app purchases available.
Which has better reviews, Empty or Fast 16?
Empty is rated higher. Empty averages 4.5 out of 5 from 95 ratings, while Fast 16 averages 2.5 from 2 ratings.
Do Empty or Fast 16 have ads?
Empty shows ads; Fast 16 does not.
Which is updated more often, Empty or Fast 16?
Empty ships an update every 6 months, and Fast 16 every 3 weeks. Most recently, Empty was updated on September 26, 2026 and Fast 16 on September 18, 2026.

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