Comparison

clock4all vs Micro OPN

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

Head to head
About

clock4all

This application offers a visually appealing and accessible clock experience for all users, including those with visual impairments. It features customizable clock faces, spoken time announcements in multiple languages, and an easy-to-use interface with no complex menus.

Highlights
  • Visually pleasing clock faces
  • Spoken time announcements
  • Customizable clock designs
  • Low battery level indicator
  • Alarm setting functionality
  • Simple, menu-free interface
Features
Read full description

This is a clock for all: - for users aiming visual pleasing clock faces - for visual impaired users reading the time with better contrasts - for blind users hearing the speech synthesizer time message in their language - for children learning to read the clock - for children and adults having fun to select a clock’s face with random colors - for all users preferring apps easy to use and designed for all Thus it is a powerful clock in the sense of:  „Technology is most powerful when it empowers everyone“ (cited from www.apple.com/accessibility). The clock4all app provides 10 different clock faces. And one extra large digital time display. Alarm time can be set. The clock indicates low battery levels with a color index. Your questions may be: 1. Must I fumble with menus, settings and modes? No. This clock app is designed for simple and robust use. You will not have to make settings in menus. There are no menus, no buttons, no sliders. Because blind, partly sighed or elderly users can hardly deal with them. 2. How does it work then, to interact with this app? There are only three interactions: - You touch the display and a voice will speak out the time in your language. - You swipe over the display and the clock face will change its design. - You shake the device and a prompt appear to set the alarm time. 3. How do the app know about the language I prefer? The app simply uses the selected language of your iPad or iPhone. 4. Can I hear the voice speaking out the time in different languages? Just go to your general iPad/iPhone settings of „Language & Region“ and change the language and its region. 5. Which languages/nations are supported by this app? USA/England, Spain, French, Italy, Germany, Netherlands, Ireland, Czech Republic, Hungary, China. Japan, Korea. 6. My language is not supported yet. Do you plan to update for it? Yes, of course, it is a clock4all. Get in contact with the author: juergen.held@hfg-gmuend.de Explain how to spell the time in your language for to update the app. 7. Does the clock4all app supports different display sizes? Yes all displays are supported. The clock’s faces will be presented at best readable sizes. 8. Can I use the clock4all in portrait and landscape orientation? Yes, the clock will rotate if you rotate your iPad or iPhone device. 9. How will the clock tell about low battery levels? Less 10% battery capacity will trigger the clocks face to have blue colored markers. Less 5% battery and the markers became red colored. If you tap then to hear the time message, the voice will append: "Battery level is less x%".

About

Micro OPN

Features
Read full description

Provide data analysis and device management services for microgrid operators

Screenshots

clock4all4 screens
Micro OPN4 screens

Verdict

The call

The clearest difference is price: Micro OPN at Free against clock4all's $0.99. Micro OPN also leads on update cadence (every 4 weeks vs every 7 months). On ads, in-app purchases, device support and iOS requirement 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

Micro OPN is free to download; clock4all costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

clock4all ships an update every 7 months, Micro OPN every 4 weeks. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

Scorecard2 real differences · 7 level
clock4all versus Micro OPN: the parameters behind the verdict, then further details
Parameterclock4allMicro OPN
Price$0.99Free — better
Rating1.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 7 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.012.0
Further details — not scored
Size8 MB106 MB
Age rating4+4+
DeveloperJuergen Held杭州锦朋新能源有限公司

In-app purchases

None

clock4all

No in-app purchases

None

Micro OPN

No in-app purchases

Questions

Is clock4all free?
clock4all costs $0.99, with no in-app purchases.
Is Micro OPN free?
Micro OPN is free to download, with no in-app purchases.
Do clock4all or Micro OPN have ads?
Neither clock4all nor Micro OPN shows ads.
Which is updated more often, clock4all or Micro OPN?
clock4all ships an update every 7 months, and Micro OPN every 4 weeks. Most recently, clock4all was updated on November 3, 2026 and Micro OPN on October 27, 2026.

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