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 app offers intelligent wake-up features for Apple Watch and flexible alarm scheduling for iPhone. Customize wake windows, vibration patterns, and alarm sounds for a gentler start to your day. It also supports calendar event alarms and timers.

Highlights
  • Smart Wake on Apple Watch
  • Flexible iPhone alarm schedules
  • Customizable wake windows
  • Gentle fade-in sounds
  • Calendar event alarms
  • Power Nap Mode
  • Lucid Dream Alarm Mode
Features
Read full description

Smart Wake on Apple Watch. Flexible Alarms on iPhone. Wake more gently with intelligent Smart Wake on Apple Watch, or build flexible alarm schedules on iPhone. FlexiAlarm gives you control over how—and when—you wake. Smart Wake responds to signs that you’re waking within your chosen wake window, aiming for a gentler start. Adjust its sensitivity, wrist vibrations and snooze to suit you. No Apple Watch? No problem. Use iPhone alarms for shift work, changing rosters and everyday routines. Choose weekdays, repeat every few weeks or select specific dates, then skip or move one alarm when plans change. Smart Wake and sleep statistics require an Apple Watch. Scheduled iPhone alarms, Calendar alarms and timers work without one. One-time purchase. No subscription. IPHONE ALARMS THAT FIT YOUR LIFE • Flexible schedules Set fixed times for your working days, repeat every few weeks or choose individual dates. • Change one alarm, keep your schedule Skip or move a single occurrence without changing the rest. Review upcoming alarms and undo future skips or moves. • Templates, routines and timer sets Save fixed times in a template, build a routine around one start time, or run a sequence of countdowns. Keep different setups ready for workdays, days off and breaks. • Calendar event alarms Choose an event and how early its alarm should ring, or enable automatic event alarms for selected calendars. Your calendar stays unchanged. • Sounds and gentle fade-in Choose a sound, preview its softer fade-in and set separate default sounds for regular and Calendar alarms. Allow Alarms so your iPhone can ring through Silent Mode and Focus. SMART WAKE ON APPLE WATCH • Intelligent wake timing Set your latest wake-up time and choose a window. Smart Wake looks for signs that you’re waking within it instead of relying only on a fixed time. • Adjustable sensitivity and wrist vibrations Fine-tune how readily Smart Wake responds. Choose vibration strength, repeat intervals, increasing vibration and snooze length. • Power Nap Mode Set a dedicated alarm for a quick rest. • Lucid Dream Alarm Mode Automatically stop the alarm after a chosen duration for techniques such as CAN-WILD or DEILD. SLEEP REPORTS AND INSIGHTS Explore sleep recorded by your Apple Watch in Apple Health, including sleep stages, quality insights, history and trends. Keep useful information close with widgets and Watch complications. These sleep features require Apple Watch sleep data. MADE FOR IPHONE DUO Keep alarms and Calendar side by side on the open display, with layouts that adapt when you fold or rotate. Use bedside mode for a dimmable clock, next alarm and countdown, with separate iPhone and Watch status. TWO SYSTEMS, YOUR CHOICE Use iPhone alarms, Watch alarms or both. iPhone alarms follow saved schedules. Watch alarms must be armed manually in FlexiAlarm on your Watch before each sleep and do not repeat automatically. Starting, skipping or stopping one system does not control the other. Prefer your phone? iPhone-only mode focuses on alarms, Library and Calendar, with Watch and sleep features hidden. No account required. Your sleep data stays on your devices. Wake up your way, whatever your schedule. 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 $5.99. 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, ratings volume, 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 $5.99 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 2 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 November 4, 2026 and October 30, 2026 respectively.

Scorecard7 real differences · 4 level
FlexiAlarm versus SleepHack: the parameters behind the verdict, then further details
ParameterFlexiAlarmSleepHack
Price$5.99Free — better
Rating5.0 (3 ratings)5.0 (2 ratings)
Positive reviews75.0% of reviews100.0% of reviews — better
Number of ratings3 — better2
Update frequencyEvery 8 daysEvery 6 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#63 — better—
DevicesiPhone, Apple WatchiPhone, iPad, iPod — better
Requires iOS26.215.1 — better
Further details — not scored
Size37 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 $5.99, 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 2 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 November 4, 2026 and SleepHack on October 30, 2026.

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