# ADClock Blackboard

> Customizable analog and digital clock with a blackboard theme. (iPhone/iPad app by Hiroyuki Otsuka.)

- Source: https://appshunter.io/ios/app/adclock-blackboard/id574832850 (this page in markdown: same URL + `.md`)
- Developer: [Hiroyuki Otsuka](https://appshunter.io/developer/554117199)
- Category: Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 6.0 · 28 MB
- Languages: American English, Japanese
- Released: 2012-11-11
- Data updated: 2026-06-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/adclock-blackboard/id574832850/reviews.md

## What is ADClock Blackboard?

Analog and digital clock.
This design theme is "Blackboard".

You can set the various functions in the 2 settings button.
　General setting -> Setting button.
　Specific settings for each design -> (Q)uick Setup button.

You can see the detail operating movie. Please press information (i) menu, and you will find app website.

FEATURES
・12/24-hour display format switch.
・Date indication switch (English, Japanese, Korean).
・Auto lock ON/OFF.
・you can invert the design horizontal or vertical (reflect to mirrors and glass, etc.)
　※ Shake -> invert switching.

・Time signal voice sound ON／OFF (English, Japanese).
　※ You can switch 30 or 60 minutes intervals.


NOTE:
・When this app does not start up, please try double-push the home button, and quit other running apps.
・There is no alarm function.
・Use iPhone or iPod Touch charging up for long term usage.
・Time accuracy is according to the internal clock. There is no time synchronization function.
・The design may be subject to change without notice due to circumstances in the version up.

## Key features

- 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


## Frequently asked questions about ADClock Blackboard

### What is ADClock Blackboard?

ADClock Blackboard is a utility app that displays analog and digital clocks with a unique "Blackboard" design theme. It offers various customization options for the clock display and time signals.

### Does ADClock Blackboard have an alarm function?

No, ADClock Blackboard does not have an alarm function. The app's description explicitly states this limitation.

### What devices is ADClock Blackboard compatible with?

ADClock Blackboard is supported on iPhone and iPod Touch devices. It was released on November 11, 2012, and its latest version is 1.3.1, last updated on September 13, 2016.

### How accurate is the time displayed by ADClock Blackboard?

The time accuracy of ADClock Blackboard is dependent on the device's internal clock. The app does not include a time synchronization function.

### Can I invert the ADClock Blackboard display?

Yes, you can invert the ADClock Blackboard design horizontally or vertically, which is useful for reflections in mirrors and glass. This is switched by shaking the device.

### What languages are supported for date and time signals in ADClock Blackboard?

The date indication supports English, Japanese, and Korean. The time signal voice sound is available in English and Japanese, with options for 30 or 60-minute intervals.

### Is ADClock Blackboard free to use?

Yes, ADClock Blackboard is available for free. It does not have in-app purchases or advertisements, as indicated by its pricing and ad flags.

### How often is ADClock Blackboard updated?

ADClock Blackboard was last updated on September 13, 2016, to version 1.3.1. The design may be subject to change without notice due to version updates.

## Version history (last 5 releases)

### 1.3.1 — 2016-09-13

This app has been updated by Apple to display the Apple Watch app icon.

Adjusted iOS 7 Later UI.
Link address fixed.

### 1.3 — 2014-06-29

4 inches screen supported. 
Added a variation. And bug fixed.

### 1.2 — 2013-01-10

Added time setting to advance (forward).

### 1.1 — 2012-12-03

Added landscape analog clock mode. and bug fixed.

### 1.0 — 2012-11-09

No release notes.

## Apps similar to ADClock Blackboard

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| --- | --- | --- | --- |
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| [Custom Digital Clock](https://appshunter.io/ios/app/custom-digital-clock/id6476612907) | 1.0 (1) | Free | Utilities |
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| [Lightweight Clock](https://appshunter.io/ios/app/lightweight-clock/id6733222071) | 5.0 (1) | Free | Utilities |

## More apps by Hiroyuki Otsuka

- [ADClock SideWood](https://appshunter.io/ios/app/adclock-sidewood/id581666141)
- [ADClock Standard](https://appshunter.io/ios/app/adclock-standard/id1116464082)

All apps by Hiroyuki Otsuka: https://appshunter.io/developer/554117199

## Related topics

[adclock blackboard](https://appshunter.io/ios/topics/adclock-blackboard) · [otsora](https://appshunter.io/ios/topics/otsora)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*