Comparison

World Clock vs Universal Unit Converter!

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

Head to head
About

World Clock

Easily calculate time differences worldwide by scrolling a dynamic time bar. Add any city, set specific dates and times, and plan international meetings or calls effortlessly. The app syncs with iOS time data.

Highlights
  • Dynamic time bar for instant difference calculation
  • Add and manage multiple cities
  • Direct date and time specification
  • Customizable city names
  • Syncs with iOS time data
Features
Read full description

"World Clock" is the best app to calculate time differences all over the world. All cities' times change automatically just by scrolling it with your finger. Therefore, you don't need to add or subtract times any more to calculate time differences. ■■Features■■ -Scrolling the time bar on the side of the screen up and down simultaneously changes the time in each city to the future or past. -Double-tap the time bar to change the time unit between 1 minute and 1 hour. -You can add any city from the list of cities provided in the app. -Tap each city to specify the date and time directly. -Press and hold on a city to change the city and edit the custom name. -Only one fixed city can be displayed at the top of the screen. ■■Examples of use■■ -International meeting planner -International call -Trip planning Disclaimer:This application has been built with extreme care and attention. However, it does not guarantee the accuracy of the names and times of the cities displayed. Please note that we are not liable whatsoever for any profit loss, or any other form of loss experienced by the customer from using this application. ※We don't have any time difference data in our app. We have been inquiring about time differences of each city to iOS. Therefore, “World Clock” shows you the time of iOS. As a result, depending on the version of iOS you are using, the exact time may not be displayed. If you find a time lag in our app, please confirm default "Clock" app on your iPhone. If the time in "Clock" app is the same with the time in our “World Clock”, it means that our app is running normally. ※Abbreviated name of time zone was originally researched and added. If you notice any mistakes, please contact us from the support site. ※The screenshots are specially edited not to show ads.

About

Universal Unit Converter!

Features
Read full description

Just type a number — that's it. Universal Unit Converter instantly converts your input into every unit at once. ■ Perfect for · Travelers and online shoppers juggling metric vs. imperial · Anyone switching between m², ft² and pyeong · Checking live currency rates and gold/silver prices fast · Cooking, fitness, and interior measurements ■ Key features · Real-time conversion — every unit updates as you type, no button · Length / Weight / Area / Temperature / Time / Data / IT-Display · Traditional East Asian units (pyeong, don, geun, ja, gan…) · 160+ live currencies + gold & silver prices · Country presets (KR / US / UK / JP / CN) · Conversion history & favorites (stored offline) · 4 languages (EN/KO/JA/ZH) · large-text mode · dark mode ■ Why you'll like it · Works offline (rates show the last fetched value) · Exact fraction math for error-free results · Ads placed only where they don't block your workflow Convert anything, anywhere — fast and accurate.

Screenshots

World Clock4 screens
Universal Unit Converter!4 screens

Verdict

The call

The clearest difference is in-app purchases: Universal Unit Converter! at none against World Clock's 1. Universal Unit Converter! also leads on update cadence (weekly vs every 6 weeks). On price, ads, 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

Both are free to download. World Clock sells 1 one-off in-app purchase. Universal Unit Converter! asks for nothing beyond the download.

UpkeepUpdate frequency

World Clock ships an update every 6 weeks, Universal Unit Converter! weekly. The most recent releases landed on June 9, 2026 and September 16, 2026 respectively.

Scorecard2 real differences · 8 level
World Clock versus Universal Unit Converter!: the parameters behind the verdict, then further details
ParameterWorld ClockUniversal Unit Converter!
PriceFreeFree
Rating3.9 (14 ratings) — better—
Positive reviews77.4% of reviews—
Number of ratings14 — better—
Update frequencyEvery 6 weeksWeekly — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationAd-supported—
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size6 MB41 MB
Age rating4+4+
DeveloperYuki FukuiTaek Oh

In-app purchases

1 purchases

World Clock

One-time1
  • Remove Advertisement$1.99
None

Universal Unit Converter!

No in-app purchases

Questions

Is World Clock free?
World Clock is free to download, with in-app purchases available.
Is Universal Unit Converter! free?
Universal Unit Converter! is free to download, with no in-app purchases.
Do World Clock or Universal Unit Converter! have ads?
Both World Clock and Universal Unit Converter! show ads.
Which is updated more often, World Clock or Universal Unit Converter!?
World Clock ships an update every 6 weeks, and Universal Unit Converter! weekly. Most recently, World Clock was updated on June 9, 2026 and Universal Unit Converter! on September 16, 2026.

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