Comparison

FastZen vs AlarmCroc

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

Head to head
About

FastZen

This app helps you track your fasting schedule with customizable durations and daily adjustments. It offers a preview of your upcoming week and allows you to repeat start times on chosen weekdays. The widget and Live Activity provide convenient access to your current session.

Highlights
  • Customizable fast durations (1-48 hours)
  • Daily schedule adjustments
  • 7-day weekly preview
  • Repeat start times on weekdays
  • Home Screen widget
  • Live Activity for Lock Screen
Read full description

FastZen tracks your fast and lets you move one date without rewriting your weekly routine. Dinner running late? Adjust that day and keep the rest of your week. Preview the next 7 days, including start times, planned finishes and rest days. • Start a 16:8, 18:6, 20:4 or OMAD (23-hour) fast. • Set a custom duration from 1 to 48 hours. • See elapsed time, remaining time and your planned finish. • Review completed sessions and correct their times. • Repeat one start time on the weekdays you choose. Your active session stays saved when you close the app. No account, no ads and no server sync. The widget puts your fast on the Home Screen. On iPhone, a Live Activity shows your session on the Lock Screen for up to 8 hours, the iOS limit. The session stays saved in the app. FastZen is a tracking tool, not medical advice or a promise of weight loss. Custom Week is a one-time purchase with no subscription. It unlocks a separate plan and start time for each weekday, rest days, and changes to a single date without changing your recurring week. People who used FastZen before version 1.1.0 keep that access without paying.

About

AlarmCroc

This app helps heavy sleepers wake up by requiring them to complete a task before the alarm stops. It offers various missions like solving math problems or taking a photo, and includes features to block distracting apps and track morning habits.

Highlights
  • Mission-based wake-ups
  • App blocking
  • Streaks and badges
  • Morning insights
  • Home screen widgets
  • Unlimited alarms
Features
Read full description

AlarmCroc is the alarm clock for people who struggle to wake up in the morning. You set the alarm and pick a wake-up mission. When it rings, the alarm doesn’t go away until the mission is done, so you have to get up and move, think, or speak before your morning starts for real. AlarmCroc is built for heavy snoozers, slow risers, and anyone tired of “five more minutes” turning into an hour. How AlarmCroc works: 1. Set your alarm and choose a wake-up mission before bed 2. When the alarm rings, complete the task in the app 3. The alarm stops only when the mission is finished No half-asleep dismiss. No easy escape. Wake-up missions: - Solve math problems - Do pushups - Take a photo of the sky - Make your bed - Hunt for a random object - Read a Bible verse aloud - Say an affirmation aloud Why people use AlarmCroc: - Break the snooze loop for good - Wake up with action, not willpower - Build a morning routine that actually sticks - Turn “getting out of bed” into a daily win - Stay accountable when mornings are hardest More than a basic alarm: - Real iOS alarms — powered by AlarmKit, so alarms show on your Lock Screen and Dynamic Island - Mission-based wake-ups — the alarm keeps going until you finish - App Block — block distracting apps (and even app deletion) until your mission is complete - Streaks & badges — track consistency and earn achievements over time - Morning insights — see wake times, time-to-rise, sleep trends, and morning memories from photo missions - Alarm Log — compare what’s in the app with what iOS has scheduled, so nothing slips through the cracks - Home Screen widgets — keep your next alarm and streak visible - Unlimited alarms — weekdays, weekends, one-offs, whatever you need Questions, ideas, or feedback? Message us in the app or email alarmcroc@gmail.com. Terms of Use: https://alarmcroc.com/terms Privacy Policy: https://alarmcroc.com/privacy

Screenshots

FastZen4 screens
AlarmCroc4 screens

Verdict

The call

The clearest difference is in-app purchases: AlarmCroc at none against FastZen's 1. AlarmCroc also leads on update cadence (every 2 days vs weekly). FastZen's advantage is iOS requirement (17.0 vs 26.1). On price, review sentiment, ads and monetization model 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. FastZen sells 1 one-off in-app purchase. AlarmCroc asks for nothing beyond the download.

UpkeepUpdate frequency

FastZen ships an update weekly, AlarmCroc every 2 days. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

Scorecard3 real differences · 7 level
FastZen versus AlarmCroc: the parameters behind the verdict, then further details
ParameterFastZenAlarmCroc
PriceFreeFree
Rating—5.0 (11 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—11 — better
Update frequencyWeeklyEvery 2 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better26.1
Further details — not scored
Size3 MB479 MB
Age rating4+4+
DeveloperBenjamin DupinDylan Morgan

Customer experience

FastZen

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

AlarmCroc

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

FastZen

One-time1
  • FastZen Custom Week$5.99
None

AlarmCroc

No in-app purchases

Questions

Is FastZen free?
FastZen is free to download, with in-app purchases available.
Is AlarmCroc free?
AlarmCroc is free to download, with no in-app purchases.
Do FastZen or AlarmCroc have ads?
Neither FastZen nor AlarmCroc shows ads.
Which is updated more often, FastZen or AlarmCroc?
FastZen ships an update weekly, and AlarmCroc every 2 days. Most recently, FastZen was updated on November 9, 2026 and AlarmCroc on November 5, 2026.

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