Comparison

Empty vs Rhythm

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

Rhythm

This app simplifies intermittent fasting with a daily tracker. It supports various fasting schedules, from beginner-friendly to advanced, and helps users monitor their progress over time. Get notifications when your fast is complete.

Highlights
  • Daily fasting tracker
  • Flexible schedule support
  • Weekly progress tracking
  • Customizable fasting goals
  • One-click start
  • Progress monitoring
  • Completion notifications
Features
Read full description

Rhythm is a simple intermittent fasting tracker for people who want a clean fast timer without the bloat. No account. No ads. Just a focused way to start a fast, stay on track, and review your history when you're done. Choose any fasting goal from 7 to 24 hours, including popular rhythms like 16:8 and 18:6. Start a fast in seconds, follow your progress live, and switch between countdown and elapsed timer views. Rhythm helps you stay consistent with: - flexible fasting goals - multiple fasts in the same day - reminder and completion notifications - editable fasting history - weekly progress insights If you want a fasting app that feels simple, respectful, and easy to trust, Rhythm gives you the essentials and gets out of your way.

Screenshots

Empty4 screens
Rhythm4 screens

Verdict

The call

The clearest difference is in-app purchases: Rhythm at none against Empty's 1. Rhythm also leads on ads (none vs shown) and review sentiment (89% vs 70%). Empty's advantage is update cadence (every 6 months vs every 13 months) and iOS requirement (15.6 vs 17.6). On price, rating 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. Rhythm asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Rhythm holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 95 and 454 respectively. Written reviews point the same way: 70% of Empty's written reviews are positive against 89% of Rhythm's.

UpkeepUpdate frequency

Empty ships an update every 6 months, Rhythm every 13 months. The most recent releases landed on September 26, 2026 and August 10, 2026 respectively.

Scorecard7 real differences · 3 level
Empty versus Rhythm: the parameters behind the verdict, then further details
ParameterEmptyRhythm
PriceFreeFree
Rating4.5 (95 ratings)4.7 (454 ratings) — better
Positive reviews70.0% of reviews88.5% of reviews — better
Number of ratings95454 — better
Update frequencyEvery 6 months — betterEvery 13 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.6 — better17.6
Further details — not scored
Size14 MB3 MB
Age rating4+12+
DeveloperThang NguyenBijan Cronin

Customer experience

Empty

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

Rhythm

All ratings444 ratings
Positive91.9%
Neutral3.8%
Negative4.3%
Written reviews235 reviews
Positive88.5%
Neutral6.0%
Negative5.5%

Bugs and requests

Empty

Not enough reviews yet to summarise bugs or requests.

Rhythm

Reported bugs

2 issues
  • Can't add past fasts
  • Inconsistent weekly progress tracking

Requested features

5 requests
  • Ability to track longer fasts (e.g., 48-72 hours)
  • Option to view fasting history beyond the past week
  • Customizable notifications and reminders
  • Integration with health/fitness tracking apps
  • Weight tracking and progress visualization

In-app purchases

1 purchases

Empty

One-time1
  • Pro Upgrade$4.99
None

Rhythm

No in-app purchases

Questions

Is Empty free?
Empty is free to download, with in-app purchases available.
Is Rhythm free?
Rhythm is free to download, with no in-app purchases.
Which has better reviews, Empty or Rhythm?
Rhythm is rated higher. Empty averages 4.5 out of 5 from 95 ratings, while Rhythm averages 4.7 from 454 ratings.
Do Empty or Rhythm have ads?
Empty shows ads; Rhythm does not.
Which is updated more often, Empty or Rhythm?
Empty ships an update every 6 months, and Rhythm every 13 months. Most recently, Empty was updated on September 26, 2026 and Rhythm on August 10, 2026.

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