Comparison

ADClock Blackboard vs Digital Clock Ultra

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ADClock Blackboard

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
Read full description

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.

About

Digital Clock Ultra

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
Read full description

Transform your clock with Digital Clock Ultra! Personalize with photos, calendar, year progress tracker, and sleek design. Download now! Digital Clock Ultra is an app that provides a comprehensive time-keeping experience for users. The app includes a digital clock display that can be set to either a 12-hour or 24-hour format. The clock is displayed in large, easy-to-read digits that can be seen from a distance. In addition to the clock, Digital Clock Ultra also includes a built-in calendar that shows the current month and marks today's date with a red dot. Plus Digital Clock Ultra show Year Progress. Year Progress is a feature in Digital Clock Ultra that displays the current year's progress as a percentage. The app calculates the number of days that have passed since January 1st and displays it as a percentage, giving users a visual representation of how much of the year has already elapsed. One of the unique features of Digital Clock Ultra is the ability to set your own photos as background images. Users can choose from their own photo library or use default image. The app automatically adjusts the photo to fit the screen and adds a transparent clock overlay on top. This feature allows users to personalize the app and make it truly their own. Digital Clock Ultra is designed with a sleek and modern user interface that is easy to navigate. All the features are easily accessible from the main screen, making it easy to switch between the clock, calendar, and settings. Overall, Digital Clock Ultra is a great app for anyone who wants a customizable clock and a basic calendar experience. With its digital clock display, built-in calendar, and the ability to set your own photos as background images, this app is perfect for keeping track of time and adding a personal touch to your device.

Screenshots

ADClock Blackboard3 screens
Digital Clock Ultra4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
ADClock Blackboard versus Digital Clock Ultra: the parameters behind the verdict, then further details
ParameterADClock BlackboardDigital Clock Ultra
PriceFreeFree
Rating5.0 (1 ratings) — better4.8 (8 ratings)
Positive reviews—100.0% of reviews
Number of ratings18 — better
Update frequencyEvery 10 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, Mac — better
Requires iOS6.0 — better17.0
Further details — not scored
Size28 MB42 MB
Age rating4+4+
DeveloperHiroyuki OtsukaSeungJun Lee

Customer experience

ADClock Blackboard

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Digital Clock Ultra

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

ADClock Blackboard

No in-app purchases

None

Digital Clock Ultra

No in-app purchases

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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