FlexiAlarm vs SleepHack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- Adaptive binaural frequencies
- Intelligent sleep engine
- Performance-first sleep tracking
- Smart alarm
- Deep sleep enhancement modes
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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
Verdict
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
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.
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.
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.
| Parameter | FlexiAlarm | SleepHack |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 5.0 (3 ratings) | 5.0 (1 ratings) |
| Positive reviews | 75.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 8 days | Every 6 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, Apple Watch | iPhone, iPad, iPod — better |
| Requires iOS | 26.2 | 15.1 — better |
| Further details — not scored | ||
| Size | 17 MB | 112 MB |
| Age rating | 4+ | 12+ |
| Developer | Nathan Woolmore | SMB Studio LLC |
Customer experience
FlexiAlarm
SleepHack
In-app purchases
FlexiAlarm
No in-app purchases
SleepHack
- Pro Weekly$4.997 Days
- Pro Weekly$6.997 Days
- Pro Monthly$9.991 Month
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- Pro Annual$19.991 Year
- Pro Annual3 Days trial$29.991 Year
- Pro Annual3 Days trial$39.991 Year
- Pro Annual$39.991 Year
- Lifetime AccessFree
Questions
Is FlexiAlarm free?
Is SleepHack free?
Which has better reviews, FlexiAlarm or SleepHack?
Do FlexiAlarm or SleepHack have ads?
Which is updated more often, FlexiAlarm or SleepHack?
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