Comparison

Alarm Clock HD vs O

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

Head to head
About

Alarm Clock HD

Wake up refreshed with customizable alarms and sleep tracking. Enjoy your favorite music as an alarm, track your sleep patterns, and utilize features like a built-in flashlight and local weather updates. Offers a premium subscription for an ad-free experience and enhanced support.

Highlights
  • Unlimited alarms with music or custom sounds
  • Sleep tracking and analysis
  • Customizable nightstand display
  • Integrated flashlight
  • Local weather information
  • Sleep timer
Features
Read full description

Sleep better and start the day with your favorite tunes. Are you curious to see how much you slept? Then, track your sleep in the app. Alarm Clock HD is the app to help you enjoy restful sleep and wake up worry-free. How Alarm Clock HD helps you sleep better: • Unlimited Alarms: Apple Music or Alarm Sounds • Customize Nightstand display colors • Sleep Timer • Local Weather Information • Instant Flashlight - shake the device • Full watchOS 2 support • Screen Saver - for devices with OLED display WAKE UP ON TIME: Proper Alarm Settings • Keep the app open and running always to have your alarm go off and play the sounds you’ve set for ‘Music'. When your app is open, you can use the volume slider within the app. When the app is in the background, use the device volume to set your volume. • Make sure your battery is charged and have your notifications turned on before you go to sleep, when the battery level goes below 30% it might not sound. This is due to prevent the device from dying and the alarm not going off. • Keep your Apple Music available on your device The music you can select consists of everything you have available on your ‘Apple Music' app on your device. If the music is saved on your iCloud, and not on the device itself, it won’t be available. NEVER MISS AN ALARM When you close the app and do not have it running in the background, the alarm will use the device volume instead and play the notification sound system. The app will close itself automatically after 10 hours of inactivity. This is due to prevent the device from dying and the alarm not going off. When your device is muted, set to ‘Do Not Disturb’, or your device volume is set to 0, the alarm won’t play properly. It will still show the notification without any sound. This is due to Apple’s restrictions as we are unable to access the app settings when the app is closed, only when it’s open or running in the background. SUBSCRIPTION IN ALARM CLOCK HD Upgrade to a Premium Membership and receive the following ongoing value: • Ad-Free • News & X feeds (Twitter) • Premium Customer Support Terms & Conditions: https://impalastudios.com/terms Privacy Policy: https://impalastudios.com/privacy >> WE LOVE FEEDBACK As always, we appreciate your feedback. Please email us at support@impalastudios.com with any suggestions or questions, our support team is ready and happy to help. WAKE UP YOUR WAY, EVERY DAY

About

O

This utility app offers real-time location tracking via Google Maps, including features like geo-fencing, historical track playback, and alarm settings. It also supports work mode configurations for enhanced functionality.

Highlights
  • Real-time Google Maps tracking
  • Geo-fencing capabilities
  • Historical track playback
  • Alarm setting
  • Work mode configuration
Features
Read full description

O-track tracking app with all kinds of functions. Such as google map real time tracking,geo-fence,historial track and playback ,alarm setting, work mode setting..

Screenshots

Alarm Clock HD4 screens
O3 screens

Verdict

The call

The clearest difference is rating: Alarm Clock HD at 4.5 against O's 3.2. Alarm Clock HD also leads on ratings volume (104K vs 28) and review sentiment (32% vs 15%). O's advantage is in-app purchases (none vs 10) and ads (none vs shown). On price 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. Alarm Clock HD sells 10 in-app purchases, starting at $1.49 per month. O asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Alarm Clock HD holds the better App Store score, 4.5 against 3.2. That said, the two scores are not equally well evidenced: Alarm Clock HD has 104K ratings behind it against 28, so its average is the more settled of the two. Written reviews point the same way: 32% of Alarm Clock HD's written reviews are positive against 15% of O's.

UpkeepUpdate frequency

Alarm Clock HD ships an update fortnightly, O every 6 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

Scorecard8 real differences · 2 level
Alarm Clock HD versus O: the parameters behind the verdict, then further details
ParameterAlarm Clock HDO
PriceFreeFree
Rating4.5 (104K ratings) — better3.2 (28 ratings)
Positive reviews31.6% of reviews — better15.4% of reviews
Number of ratings104K — better28
Update frequencyFortnightly — betterEvery 6 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.613.0 — better
Further details — not scored
Size234 MB26 MB
Age rating4+4+
DeveloperImpala StudiosShenzhen Orchid Electronic Technology Co., Ltd.

Customer experience

Alarm Clock HD

All ratings104,435 ratings
Positive88.4%
Neutral4.7%
Negative6.9%
Written reviews934 reviews
Positive31.6%
Neutral8.1%
Negative60.3%

O

Written reviews13 reviews
Positive15.4%
Neutral7.7%
Negative76.9%

Bugs and requests

Alarm Clock HD

Reported bugs

4 issues
  • Alarm randomly snoozing itself
  • Alarm not working when phone is muted
  • Alarm sound not playing
  • Alarm screen freezing/crashing

Requested features

4 requests
  • 24-hour clock option
  • More alarm sounds/tones
  • Ability to use own music files
  • Do not disturb mode

O

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

Alarm Clock HD

Subscriptions10
  • Premium member - 1 month$1.491 Month
  • Premium Features - Weekly$1.997 Days
  • Premium Features - Monthly3 Days trial$2.591 Month
Show 7 more
  • Upgrade to Premium Features$5.496 Months
  • Premium Yearly$9.991 Year
  • Premium Yearly3 Days trial$11.991 Year
  • Upgrade Your Alarm Clock3 Days trial$14.991 Year
  • Premium yearly$19.991 Year
  • Premium yearly3 Days trial$19.991 Year
  • Premium yearly3 Days trial$29.991 Year
None

O

No in-app purchases

Questions

Is Alarm Clock HD free?
Alarm Clock HD is free to download, with in-app purchases available.
Is O free?
O is free to download, with no in-app purchases.
Which has better reviews, Alarm Clock HD or O?
Alarm Clock HD is rated higher. Alarm Clock HD averages 4.5 out of 5 from 104K ratings, while O averages 3.2 from 28 ratings.
Do Alarm Clock HD or O have ads?
Alarm Clock HD shows ads; O does not.
Which is updated more often, Alarm Clock HD or O?
Alarm Clock HD ships an update fortnightly, and O every 6 weeks. Most recently, Alarm Clock HD was updated on November 7, 2026 and O on November 3, 2026.

Other comparisons