# ADClock Blackboard vs Digital Clock Ultra

The clearest difference is update cadence: Digital Clock Ultra at every 3 weeks against ADClock Blackboard's every 10 months. Digital Clock Ultra also leads on ratings volume (8 vs 1). ADClock Blackboard's advantage is rating (5.0 vs 4.8) and iOS requirement (6.0 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ADClock Blackboard holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Digital Clock Ultra has 8 ratings behind it against 1, so its average is the more settled of the two.

ADClock Blackboard ships an update every 10 months, Digital Clock Ultra every 3 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | ADClock Blackboard | Digital Clock Ultra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/adclock-blackboard/id574832850/reviews)** | [4.8 (8 ratings)](https://appshunter.io/ios/app/digital-clock-ultra/id1672768275/reviews) |
| Number of ratings | 1 | **8** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 28 MB | 42 MB |
| Requires iOS | **6.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyuki Otsuka](https://appshunter.io/developer/554117199) | [SeungJun Lee](https://appshunter.io/developer/1435485286) |

## 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


### Digital Clock Ultra

[App page](https://appshunter.io/ios/app/digital-clock-ultra/id1672768275)

Customize your device's clock with personalized backgrounds, calendar integration, and a year progress tracker. Enjoy a sleek, easy-to-navigate interface for a unique time-keeping experience.

**Highlights:** Customizable digital clock display, 12/24 hour format, Built-in calendar with date marking, Year progress percentage tracker, Personalized photo backgrounds, Sleek and modern UI

**In-app purchases:** none


## Frequently asked questions

### Is ADClock Blackboard free?

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

### Is Digital Clock Ultra free?

Digital Clock Ultra is free to download, with no in-app purchases.

### Which has better reviews, ADClock Blackboard or Digital Clock Ultra?

ADClock Blackboard is rated higher. ADClock Blackboard averages 5.0 out of 5 from 1 ratings, while Digital Clock Ultra averages 4.8 from 8 ratings.

### Do ADClock Blackboard or Digital Clock Ultra have ads?

Neither ADClock Blackboard nor Digital Clock Ultra shows ads.

### Which is updated more often, ADClock Blackboard or Digital Clock Ultra?

ADClock Blackboard ships an update every 10 months, and Digital Clock Ultra every 3 weeks. Most recently, ADClock Blackboard was updated on November 1, 2026 and Digital Clock Ultra 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.*