Comparison

FlexiAlarm vs SleepHack

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

Head to head
About

FlexiAlarm

This smart alarm app for Apple Watch offers extensive customization for wake-up experiences. It features intelligent sleep phase timing, adjustable vibration, and a power nap mode, all designed for a more refreshed start to your day.

Highlights
  • Customizable wake window, snooze, and vibration
  • Intelligent smart wake (sleep phase timing)
  • Vibration-only alarm
  • Power nap mode
  • Apple Health integration
  • Lucid dream alarm mode
  • Watch face complications and widgets
Features
Read full description

Wake Up Your Way on Apple Watch FlexiAlarm is a smart alarm built exclusively for Apple Watch — designed for people who want complete control over every part of their alarm. Fine-tune how you wake up: wake window, snooze, vibrations, repeats, and sensitivity. FlexiAlarm includes an intelligent smart wake feature that aims to wake you during your lightest sleep phase within your chosen wake window — for a smoother start to the day. KEY FEATURES • Total Alarm Customization Set your wake window, snooze length, vibration strength, repeat intervals, and alarm behavior directly on Apple Watch. • Adjustable Wake Sensitivity Dial in how responsive the smart wake feature is — ideal for light sleepers and deep sleepers. • Vibration Alarm Private haptic wake-ups without disturbing your partner. • Smart Wake (Sleep Phase) Intelligent wake timing within your selected window to help you wake feeling more refreshed. • Power Nap Mode Quick naps with controlled wake timing. • Apple Health Integration Works with Apple Health to complement your sleep routine. • Lucid Dream Alarm Mode Alarm mode that automatically turns off the alarm after a set amount of time. Perfect for Lucid Dreaming techniques such as "CAN-WILD" or DEILD. • Complications & Widgets Fast access from your watch face for alarms and sleep insights. • Privacy-First No accounts. No tracking. Data stays on-device. WHY FLEXIALARM • One-Time Purchase — No Subscription • Built Exclusively for Apple Watch • Designed for flexibility, control, and speed Wake up on your terms — not just on time. Privacy Policy: https://sites.google.com/view/mildtrainerprivacypolicy/home Terms: https://sites.google.com/view/flexialarmterms/home

About

SleepHack

This app uses adaptive binaural frequencies and an intelligent sleep engine to optimize your sleep cycles for deeper rest and improved performance. It offers performance-first sleep tracking and a smart alarm to wake you at the optimal moment.

Highlights
  • Adaptive binaural frequencies
  • Intelligent sleep engine
  • Performance-first sleep tracking
  • Smart alarm
  • Deep sleep enhancement modes
Features
Read full description

ADAPTIVE WHITE NOISE ENGINEERED FOR DEEPER SLEEP Sleep isn’t relaxation. Sleep is performance. SleepHack is built for people who want deeper sleep, sharper focus, and higher output — not just background noise. This isn’t another white noise app. This is adaptive sleep optimization. WHY SLEEPHACK? • Adaptive binaural frequencies that shift with your sleep • Engineered sound designed to push deeper rest • Performance-first sleep tracking • Built for high achievers, founders, athletes, and optimizers If you treat your body like hardware, your sleep needs better software. HOW IT WORKS • Intelligent Sleep Engine responds to your movement patterns • Adaptive audio evolves through the night • Designed to support Deep, Core, and REM cycles • Smart alarm that wakes you at the right moment You don’t just play sound. You run a sleep protocol. WHO IT’S FOR • People who wake up tired even after 8 hours • High performers who want a competitive edge • Anyone serious about recovery and mental clarity • Those who want more than “rain sounds” If you care about output, you should care about sleep architecture. FEATURES • Adaptive Binaural Audio • Deep Sleep Enhancement Modes • Smart Alarm • Minimal, performance-driven interface • Ongoing upgrades and sleep protocol refinements STOP GUESSING. START OPTIMIZING. Your sleep is either helping you win or holding you back. Hack it. If you choose to connect your sleep data from HealthKit, SleepHack can use that additional data to improve prediction accuracy as it learns your patterns. Your data is only used with explicit in-app consent, and you remain in control of what is shared. Terms of Service: https://sleephack.app/terms

Screenshots

FlexiAlarm4 screens
SleepHack4 screens

Verdict

The call

The clearest difference is price: SleepHack at Free against FlexiAlarm's $4.99. SleepHack also leads on review sentiment (100% vs 75%) and iOS requirement (15.1 vs 26.2). FlexiAlarm's advantage is in-app purchases (none vs 8) and ads (none vs shown). On rating, update cadence 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

SleepHack is free to download; FlexiAlarm costs $4.99 up front. SleepHack sells 8 in-app purchases, starting at $4.99 per 7 days. FlexiAlarm asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for FlexiAlarm against 5.0 for SleepHack. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews are what separate them: 75% of FlexiAlarm's written reviews are positive against 100% of SleepHack's.

UpkeepUpdate frequency

FlexiAlarm ships an update every 8 days, SleepHack every 6 days. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

Scorecard7 real differences · 3 level
FlexiAlarm versus SleepHack: the parameters behind the verdict, then further details
ParameterFlexiAlarmSleepHack
Price$4.99Free — better
Rating5.0 (3 ratings)5.0 (1 ratings)
Positive reviews75.0% of reviews100.0% of reviews — better
Number of ratings3 — better1
Update frequencyEvery 8 daysEvery 6 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, Apple WatchiPhone, iPad, iPod — better
Requires iOS26.215.1 — better
Further details — not scored
Size17 MB112 MB
Age rating4+12+
DeveloperNathan WoolmoreSMB Studio LLC

Customer experience

FlexiAlarm

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

SleepHack

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

FlexiAlarm

No in-app purchases

8 purchases

SleepHack

Subscriptions7
  • Pro Weekly$4.997 Days
  • Pro Weekly$6.997 Days
  • Pro Monthly$9.991 Month
Show 4 more
  • Pro Annual$19.991 Year
  • Pro Annual3 Days trial$29.991 Year
  • Pro Annual3 Days trial$39.991 Year
  • Pro Annual$39.991 Year
One-time1
  • Lifetime AccessFree

Questions

Is FlexiAlarm free?
FlexiAlarm costs $4.99, with no in-app purchases.
Is SleepHack free?
SleepHack is free to download, with in-app purchases available.
Which has better reviews, FlexiAlarm or SleepHack?
FlexiAlarm and SleepHack are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.
Do FlexiAlarm or SleepHack have ads?
SleepHack shows ads; FlexiAlarm does not.
Which is updated more often, FlexiAlarm or SleepHack?
FlexiAlarm ships an update every 8 days, and SleepHack every 6 days. Most recently, FlexiAlarm was updated on October 7, 2026 and SleepHack on October 6, 2026.

Other comparisons