# ADClock Blackboard vs Desk Clock Display

The clearest difference is rating: ADClock Blackboard at 5.0 against Desk Clock Display's 4.5. ADClock Blackboard also leads on in-app purchases (none vs 1) and ads (none vs shown). Desk Clock Display's advantage is ratings volume (24 vs 1) and device support (4 vs 2). On price and update cadence there is nothing between them.

Both are free to download. Desk Clock Display sells 1 one-off in-app purchase. ADClock Blackboard asks for nothing beyond the download.

ADClock Blackboard holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Desk Clock Display has 24 ratings behind it against 1, so its average is the more settled of the two.

ADClock Blackboard ships an update every 10 months, Desk Clock Display every 15 months. The most recent releases landed on October 6, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | ADClock Blackboard | Desk Clock Display |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/adclock-blackboard/id574832850/reviews)** | [4.5 (24 ratings)](https://appshunter.io/ios/app/desk-clock-display/id1481030550/reviews) |
| Number of ratings | 1 | **24** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 10 months** | Every 15 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 28 MB | 12 MB |
| Requires iOS | **6.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyuki Otsuka](https://appshunter.io/developer/554117199) | [Vladislav Kovalyov](https://appshunter.io/developer/718333197) |

## 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


### Desk Clock Display

[App page](https://appshunter.io/ios/app/desk-clock-display/id1481030550)

Transform your iPhone or iPad into a functional desk clock with an always-on display. Features include customizable clock faces, timers, and Pomodoro sessions. An upgrade unlocks all features.

**Highlights:** Always-on display, Customizable clock faces, Countdown timers up to 24 hours, Pomodoro Technique timer, Adjustable brightness, Date display toggle

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $0.99 | one-time |


## Frequently asked questions

### Is ADClock Blackboard free?

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

### Is Desk Clock Display free?

Desk Clock Display is free to download, with in-app purchases available.

### Which has better reviews, ADClock Blackboard or Desk Clock Display?

ADClock Blackboard is rated higher. ADClock Blackboard averages 5.0 out of 5 from 1 ratings, while Desk Clock Display averages 4.5 from 24 ratings.

### Do ADClock Blackboard or Desk Clock Display have ads?

Desk Clock Display shows ads; ADClock Blackboard does not.

### Which is updated more often, ADClock Blackboard or Desk Clock Display?

ADClock Blackboard ships an update every 10 months, and Desk Clock Display every 15 months. Most recently, ADClock Blackboard was updated on October 6, 2026 and Desk Clock Display on October 14, 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.*