# ADClock Blackboard vs Premium Clock Collection

The clearest difference is in-app purchases: ADClock Blackboard at none against Premium Clock Collection's 8. ADClock Blackboard also leads on rating (5.0 vs 4.6) and update cadence (every 10 months vs every 23 months). Premium Clock Collection's advantage is ratings volume (56 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. Premium Clock Collection sells 8 one-off in-app purchases. ADClock Blackboard asks for nothing beyond the download.

ADClock Blackboard holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Premium Clock Collection has 56 ratings behind it against 1, so its average is the more settled of the two.

ADClock Blackboard ships an update every 10 months, Premium Clock Collection every 23 months. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | ADClock Blackboard | Premium Clock Collection |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/adclock-blackboard/id574832850/reviews)** | [4.6 (56 ratings)](https://appshunter.io/ios/app/premium-clock-collection/id772521042/reviews) |
| Number of ratings | 1 | **56** |
| Positive reviews | — | 37.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 23 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 28 MB | 3 MB |
| Requires iOS | **6.0** | 13 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyuki Otsuka](https://appshunter.io/developer/554117199) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### ADClock Blackboard

[App page](https://appshunter.io/ios/app/adclock-blackboard/id574832850)

This utility app displays analog and digital clocks with a unique "Blackboard" design theme. It offers customizable display formats, date indications, and orientation mirroring. Users can also control time signal voice sounds and auto-lock settings.

**Highlights:** Analog and digital clock display, Blackboard design theme, 12/24-hour format switch, Date indication (EN, JP, KR), Auto lock ON/OFF, Horizontal/vertical inversion, Time signal voice sound

**Features:** macOS Compatibility

**In-app purchases:** none


### Premium Clock Collection

[App page](https://appshunter.io/ios/app/premium-clock-collection/id772521042)

Enhance your iOS device with a collection of beautifully designed analog clocks. Customize their appearance, toggle display elements like date and seconds, and set reminders. Optimized for OLED screens to save battery and prevent burn-in.

**Highlights:** Customizable clock and hand styles, Toggle date, second hand, and battery level, Set reminders and notifications, OLED screen optimization, Adjustable brightness, Quick settings access

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Clock 1 | $0.99 | one-time |
| Premium Clock 2 | $0.99 | one-time |
| Premium Clock 3 | $0.99 | one-time |
| Premium Clock 4 | $0.99 | one-time |
| Premium Clock 5 | $0.99 | one-time |
| Premium Clock 6 | $0.99 | one-time |
| Premium Clock 7 | $0.99 | one-time |
| Premium Clock 8 | $0.99 | one-time |


## Frequently asked questions

### Is ADClock Blackboard free?

ADClock Blackboard is free to download, with no in-app purchases.

### Is Premium Clock Collection free?

Premium Clock Collection is free to download, with in-app purchases available.

### Which has better reviews, ADClock Blackboard or Premium Clock Collection?

ADClock Blackboard is rated higher. ADClock Blackboard averages 5.0 out of 5 from 1 ratings, while Premium Clock Collection averages 4.6 from 56 ratings.

### Do ADClock Blackboard or Premium Clock Collection have ads?

Neither ADClock Blackboard nor Premium Clock Collection shows ads.

### Which is updated more often, ADClock Blackboard or Premium Clock Collection?

ADClock Blackboard ships an update every 10 months, and Premium Clock Collection every 23 months. Most recently, ADClock Blackboard was updated on October 6, 2026 and Premium Clock Collection on October 13, 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.*