Comparison

clock4all vs Redo Calculator

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

Head to head
About

clock4all

Features
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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

Redo Calculator

Features
Read full description

Redo Calculator lets you calculate confidently without worrying about mistakes. With full Undo and Redo support, you can easily correct inputs, and the screen-on feature ensures the display never turns off while calculating. Features - Undo & Redo for easy correction - Prevents screen from turning off during use - Clean, minimal design - Keeps your recent calculation history Simple, reliable, and focused — Redo Calculator helps you calculate without interruption.

Screenshots

clock4all4 screens
Redo Calculator1 screens

Verdict

The call

The clearest difference is price: Redo Calculator at Free against clock4all's $0.99. Redo Calculator also leads on update cadence (every 2 months 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

Redo Calculator 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, Redo Calculator every 2 months. The most recent releases landed on September 12, 2026 and October 7, 2026 respectively.

Scorecard2 real differences · 4 level
clock4all versus Redo Calculator: the parameters behind the verdict, then further details
Parameterclock4allRedo Calculator
Price$0.99Free — better
Update frequencyEvery 7 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size8 MB20 MB
Age rating4+4+
DeveloperJuergen HeldSeongmin Yim

In-app purchases

None

clock4all

No in-app purchases

None

Redo Calculator

No in-app purchases

Questions

Is clock4all free?
clock4all costs $0.99, with no in-app purchases.
Is Redo Calculator free?
Redo Calculator is free to download, with no in-app purchases.
Do clock4all or Redo Calculator have ads?
Neither clock4all nor Redo Calculator shows ads.
Which is updated more often, clock4all or Redo Calculator?
clock4all ships an update every 7 months, and Redo Calculator every 2 months. Most recently, clock4all was updated on September 12, 2026 and Redo Calculator on October 7, 2026.

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