Comparison

World Time Clock Master vs Cool Ukiyo

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

Head to head
About

World Time Clock Master

Effortlessly manage multiple time zones with this app. Convert times instantly, schedule events, and view global clocks at a glance with interactive widgets. Features atomic accuracy and a vast database of locations.

Highlights
  • Multiple time zone display
  • Interactive time conversion
  • Event scheduling
  • Atomic time accuracy
  • Dynamic home screen widgets
  • List mode for text view
  • Real moon phases and sunrise/sunset
Features
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THE EASIEST WAY TO DEAL WITH MULTIPLE TIMEZONES + INTERACTIVE WIDGETS Sick of screwing up meeting times and missing calls? This app cuts through time-zone confusion and hands you the perfect hour at a glance. Forget guesswork — just click, connect, and impress. KEY FEATURES EVENT SCHEDULING MADE EASY Found the perfect meeting time? Add events to your calendar with just a tap, and never miss an international webinar, call, or special moment again. ATOMIC ACCURACY No drift, no guesswork. Each second syncs with the atomic standard, so you can trust every moment. Extensive Time Zone Database: Tap into over 160,000 locations and time zones including GMT, UTC, and more. UNIFIED CLOCK FACE View all your essential time zones at a glance on one beautifully designed, customizable clock face. Whether you prefer digital or analog displays (or even military time), everything is exactly where you need it. INTERACTIVE TIME CONVERSION Convert times instantly by simply twisting or swiping across the clock face. Watch as your selected time zones update in real time—making planning international calls, meetings, or travel effortless. DYNAMIC WIDGETS Access global times without even opening the app. Our interactive home screen widget lets you drag a simple line to reveal and convert times, ensuring you’re always in sync no matter where you are. LIST MODE Get a clean, text-based view of all your cities in one column. See times and dates at a glance, and scroll to check future or past hours. It’s a no-fuss way to track the world’s clocks. FEELS LIKE A LUXURY TIMEPIECE We poured effort into details most people never notice — and we’re okay with that. Our users aren’t “most people.” Details include: — Real Moon Phases — Real Moon Rotation — Real Sunrise & Sunset — Advanced City Lights — Haptic Feedback * * * World Clock Master offers a premium subscription: Subscribe to get access to unlimited timezones, interactive widgets, customizations, and timely automatic updates of our timezone database of more than 160,000 locations and timezones. – Length of subscription: 1 month or 1 year – Payment will be charged to iTunes Account at confirmation of purchase – Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period – Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal – Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase – Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable – Terms & Conditions: https://timemaster.s3.amazonaws.com/Time-master-terms.pdf

About

Cool Ukiyo

Features
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This is a digital and analog clock with a background of famous Ukiyo-e prints. You can choose from 40 different Ukiyo-e works from various periods. The time, analog clock, and Ukiyo-e can be moved with a finger. The analog clock and Ukiyo-e can be zoomed in and out with two fingers. Seconds can also be displayed. The background color can be selected from 5 different colors. Touching the time character switches to setting mode. When in setting mode, you can change the year, month, and day of the week to various formats by touching. The year, month, day of the week, a.m./p.m., and seconds can be erased. You can also switch between 12-hour and 24-hour displays. Rotation of the screen in portrait and landscape mode is also supported. The size of the text can be adjusted in steps by pressing buttons such as "2X" and "3X". The time signal can be selected from 78 different tones.

Screenshots

World Time Clock Master4 screens
Cool Ukiyo4 screens

Verdict

The call

The clearest difference is ads: World Time Clock Master at none against Cool Ukiyo's shown. World Time Clock Master also leads on update cadence (fortnightly vs monthly). Cool Ukiyo's advantage is iOS requirement (12.0 vs 17.0). On price, in-app purchases and device support 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. World Time Clock Master sells 10 in-app purchases, starting at $2.99 per month and Cool Ukiyo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

World Time Clock Master ships an update fortnightly, Cool Ukiyo monthly. The most recent releases landed on September 29, 2026 and September 9, 2026 respectively.

Scorecard3 real differences · 7 level
World Time Clock Master versus Cool Ukiyo: the parameters behind the verdict, then further details
ParameterWorld Time Clock MasterCool Ukiyo
PriceFreeFree
Rating4.6 (816 ratings) — better—
Positive reviews65.8% of reviews—
Number of ratings816 — better—
Update frequencyFortnightly — betterMonthly
AdsNo — betterYes
In-app purchasesYesYes
MonetizationSubscription—
DevicesiPhone, iPad, Vision ProiPhone, iPad, iPod
Requires iOS17.012.0 — better
Further details — not scored
Size236 MB53 MB
Age rating4+4+
DeveloperAlex Komarov Inc.Mihoko Araki

Bugs and requests

World Time Clock Master

Reported bugs

4 issues
  • Lose all the registered locations after updating the app
  • Sticky signup interface
  • Widget doesn't work
  • GMT and London currently have a 1 hour time difference between the two locations, but the app shows them the same time

Requested features

4 requests
  • Add the time difference in hours between the default location and other locations in both the widget and the app
  • See my calendar events on the dial
  • Make a paid tier that doesn't collect my data
  • Add new event to a Calendar

Cool Ukiyo

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

World Time Clock Master

Subscriptions6
  • 1 month3 variants$2.991 Month
  • 3 months$3.993 Months
  • 1 year1 Year trial2 variants$11.991 Year
Show 3 more
  • 1 year3 Days trial$11.991 Year
  • 1 year$11.991 Year
  • 1 year3 Days trial$19.991 Year
One-time4
  • Lifetime$29.99
  • Lifetime$49.99
  • Lifetime$79.99
Show 1 more
  • Lifetime$99.99
1 purchases

Cool Ukiyo

One-time1
  • Cool Ukiyo-e Clock with no ads$3.99

Questions

Is World Time Clock Master free?
World Time Clock Master is free to download, with in-app purchases available.
Is Cool Ukiyo free?
Cool Ukiyo is free to download, with in-app purchases available.
Do World Time Clock Master or Cool Ukiyo have ads?
Cool Ukiyo shows ads; World Time Clock Master does not.
Which is updated more often, World Time Clock Master or Cool Ukiyo?
World Time Clock Master ships an update fortnightly, and Cool Ukiyo monthly. Most recently, World Time Clock Master was updated on September 29, 2026 and Cool Ukiyo on September 9, 2026.

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