# Alarm Clock HD vs O

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.

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.

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.

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.

## The numbers

| Metric | Alarm Clock HD | O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (104K ratings)](https://appshunter.io/ios/app/alarm-clock-hd/id476555713/reviews)** | [3.2 (28 ratings)](https://appshunter.io/ios/app/o-track/id1555901965/reviews) |
| Number of ratings | **104K** | 28 |
| Positive reviews | **31.6% of reviews** | 15.4% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 234 MB | 26 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Impala Studios](https://appshunter.io/developer/1063279743) | [Shenzhen Orchid Electronic Technology Co., Ltd.](https://appshunter.io/developer/1299608574) |

## What reviewers say

### Alarm Clock HD

[App page](https://appshunter.io/ios/app/alarm-clock-hd/id476555713)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium member - 1 month | $1.49 | per month |
| Premium Features - Weekly | $1.99 | per 7 days |
| Premium Features - Monthly | $2.59 | per month |
| Upgrade to Premium Features | $5.49 | per 6 months |
| Premium Yearly | $9.99 | per year |
| Premium Yearly | $11.99 | per year |
| Upgrade Your Alarm Clock | $14.99 | per year |
| Premium yearly | $19.99 | per year |
| Premium yearly | $19.99 | per year |
| Premium yearly | $29.99 | per year |

**What reviewers like**

- 🚀 Reliable alarm clock
- 🎨 Customizable colors
- 🔊 Ability to use music as alarm
- 💤 Gradual volume increase

**What reviewers complain about**

- 🐛 Alarm not going off
- 🔍 Difficulty seeing small buttons/text
- 💸 Subscription model for ad-free version
- 🔋 High battery consumption
- 🔇 Alarm muting phone volume

**Reported bugs**

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

**Requested features**

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


### O

[App page](https://appshunter.io/ios/app/o-track/id1555901965)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*