Comparison

One Kanji Clock vs Focus Flow:Green Focus

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

Head to head
About

One Kanji Clock

Features
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This clock displays kanji characters for your enjoyment. Kanji characters are displayed one at a time in random, and change over as time passes. The size of the characters can be changed in three levels.  The length of the switching time can be adjusted. Hiragana and English can also be displayed.  There are more than 700 kanji in the database. The number is small at first, but it will gradually increase. You can also choose your favorite kanji to display. You can choose from 20 different backgrounds. A time signal can be set to sound at 0 minutes.  You can choose from 78 different sounds for the time signal.

About

Focus Flow:Green Focus

Features
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【Focus Flow】SecCtrl is a minimalist Pomodoro timer designed to help you stay focused during deep work sessions. Built with a privacy-first approach and an iOS-inspired design system, it provides a clean, distraction-free environment for managing your time. Pomodoro Timer Start focused work sessions using the Pomodoro technique. The timer offers a straightforward interface that lets you begin, pause, and complete intervals without unnecessary complexity. Ambient Sounds Play background sounds while you work. Ambient audio can help mask environmental noise and maintain concentration during focus sessions. Deep Work Statistics Review your completed focus sessions through built-in statistics. Track how much deep work time you accumulate to better understand your productivity patterns over time. Privacy-First Design Your data stays on your device. SecCtrl is built with privacy as a core principle, ensuring your focus habits and usage information remain personal. iOS-Inspired Design System The interface follows a clean, modern aesthetic inspired by iOS design conventions. Visual elements are intentionally minimal, keeping the focus on the timer itself rather than surrounding distractions. SecCtrl aims to do one thing well — help you focus. No account required, no unnecessary features, just a reliable timer with the essentials you need for deep work. Premium Account Pricing and Terms $ 4.99/week* $ 39.99/year* *Prices shown are in U.S. dollars; actual charges may be converted to your local currency. Payment will be charged to your iTunes account at confirmation of purchase. Subscriptions automatically renew unless auto-renewal is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period, and the renewal cost will be provided. Subscriptions can be managed by the user. Turning off auto-renewal may be done by going to your account settings after purchase. Cancellation of the current subscription is not allowed during the active subscription period. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ruychao.xyz/miaokong/privacy.html

Screenshots

One Kanji Clock4 screens
Focus Flow:Green Focus3 screens

Verdict

The call

The clearest difference is ads: Focus Flow:Green Focus at none against One Kanji Clock's shown. One Kanji Clock's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.0). On price and in-app purchases 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. One Kanji Clock sells 1 one-off in-app purchase and Focus Flow:Green Focus sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Scorecard3 real differences · 3 level
One Kanji Clock versus Focus Flow:Green Focus: the parameters behind the verdict, then further details
ParameterOne Kanji ClockFocus Flow:Green Focus
PriceFreeFree
Update frequencyEvery 2 months—
AdsYesNo — better
In-app purchasesYesYes
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better16.0
Further details — not scored
Size18 MB4 MB
Age rating4+4+
DeveloperMihoko ArakiHong Kong Trillion Industrial Technology Group Limited

In-app purchases

1 purchases

One Kanji Clock

One-time1
  • One Kanji Clock with no ads$2.99
2 purchases

Focus Flow:Green Focus

Subscriptions2
  • Weekly Max3 Days trial$4.997 Days
  • Yearly Max$39.991 Year

Questions

Is One Kanji Clock free?
One Kanji Clock is free to download, with in-app purchases available.
Is Focus Flow:Green Focus free?
Focus Flow:Green Focus is free to download, with in-app purchases available.
Do One Kanji Clock or Focus Flow:Green Focus have ads?
One Kanji Clock shows ads; Focus Flow:Green Focus does not.

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