Comparison

Time Zone Difference Planner vs ONE WATCH

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

Head to head
About

Time Zone Difference Planner

Features
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PREMIUM โ€” PURCHASE REQUIRED: All features described below are part of Pro and require a purchase: a weekly or yearly auto-renewing subscription, or a one-time lifetime purchase. Stop doing time zone math before every call. TimezoneWorld lays your whole team on one 24-hour band, colors the hours when everyone is actually at their desk, and ranks the best meeting windows for you โ€” so "does 9 AM my time work for Sydney?" is answered the moment you open the app. Most world clocks show you a row of times and leave the hard part to you. TimezoneWorld starts where they stop: you set each city's working hours, and its overlap engine walks the real calendar โ€” daylight saving shifts, half-hour zones like India, even quarter-hour zones like Kathmandu โ€” to find the hours when every city is inside its working day. Tap any hour on the band and see exactly what the clock reads in every city, and on which date. WHAT YOU GET โ€ข A 24-hour overlap band in your own local time โ€” gold hours mean everyone is at their desk; tap one for the exact local time and day in every city โ€ข Best meeting windows ranked by length, so the longest shared stretch is always suggestion number one โ€ข Live clocks for up to 8 cities with an at-their-desk indicator, chosen from 400+ searchable time zones โ€ข Working hours per zone โ€” set Berlin to 8โ€“16 and Sydney to 10โ€“18 and the overlap recalculates instantly โ€ข A daily reminder the moment your team's shared window opens, so you catch everyone while they are online โ€ข One-tap sharing that writes the proposed meeting out in every invitee's own local time and date PERFECT FOR โ€ข Remote teams spread across continents who lose the first ten minutes of every week to scheduling โ€ข Freelancers and agencies booking calls with the US, Europe, and Asia in the same week โ€ข Long-distance families and couples who want to ring while everyone is actually awake โ€ข Travelers who need home time, destination time, and the difference between them at a glance WHY NOT JUST USE A WORLD CLOCK? A world clock tells you it is 3 AM in Tokyo. It does not tell you when Tokyo, Berlin, and Chicago are all working at the same time โ€” that is a search across 24 hours and every zone's own working day, with daylight saving moving the goalposts twice a year. TimezoneWorld runs that search for you and simply shows the answer. PRIVATE BY DEFAULT Everything is computed on your iPhone from the system's own time zone database. No account, no sign-in, no tracking โ€” and the app works fully offline. PREMIUM (PURCHASE REQUIRED) TimezoneWorld is unlocked by a single purchase of your choice: a Weekly subscription, a Yearly subscription, or a one-time Lifetime purchase. Full access includes all 8 zone slots, the 24-hour overlap band, ranked meeting windows, per-zone working hours, the daily overlap reminder, and meeting-time sharing. Add your cities, set the working hours, and let your next "when works for you?" answer itself. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia

About

ONE WATCH

Features
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ONE WATCH shows you the local time, live weather, and the perfect moment to call - for everyone who matters to you. Across iPhone, iPad, Apple Watch, and home-screen widgets. +++ KNOW WHEN TO CALL A traffic-light indicator tells you in one glance: green when it's a good time, orange when it's borderline, red when it's the middle of the night. Set per-contact call windows, weekday availability, and time-zone preferences. +++ PHOTO WIDGETS Add your contacts with their real photo and see them on your home screen and Apple Watch. World clock, but personal. +++ LIVE WEATHER Each contact card shows the current weather at their location, powered by Apple Weather. Useful for travel planning, meeting coordination, or just being a thoughtful friend. +++ APPLE WATCH + COMPLICATIONS Full Apple Watch app with all complication slots โ€” see your people on every watch face. +++ EVENT CONVERTER Plan meetings across time zones. Pick a moment, see what time it is for everyone. +++ 12 LANGUAGES English, German, Spanish, Portuguese, French, Italian, Dutch, Japanese, Korean, Chinese, Hindi, Arabic. +++ LIGHT & DARK MODE Beautifully designed for both โ€” choose your preference or follow the system. +++ PRIVACY FIRST No accounts. No tracking. No analytics. No ads. Contact data stays on your device, never uploaded anywhere. Weather data is fetched via Apple WeatherKit. +++ ONE WATCH PREMIUM Unlock home-screen widgets, Apple Watch app + complications, multiple contact photos, weekday selector, per-contact availability toggle, and analog clock styles. Choose monthly, yearly, or a one-time lifetime purchase. Family Sharing supported. Privacy Policy: https://onewatch.onepage.me/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Made in Austria.

Screenshots

Time Zone Difference Planner4 screens
ONE WATCH4 screens

Verdict

The call

The clearest difference is update cadence: ONE WATCH at every 3 days against Time Zone Difference Planner's every 4 months. ONE WATCH also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Time Zone Difference Planner sells 3 in-app purchases, starting at $2.99 per 7 days and ONE WATCH sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Time Zone Difference Planner ships an update every 4 months, ONE WATCH every 3 days. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

Scorecard2 real differences ยท 4 level
Time Zone Difference Planner versus ONE WATCH: the parameters behind the verdict, then further details
ParameterTime Zone Difference PlannerONE WATCH
PriceFreeFree
Update frequencyEvery 4 monthsEvery 3 days โ€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone, iPad, Apple Watch โ€” better
Requires iOS17.0 โ€” better18.0
Further details โ€” not scored
Size5 MB52 MB
Age rating4+4+
DeveloperLEAN ASIA CO., LTDJohann Szebeni

In-app purchases

3 purchases

Time Zone Difference Planner

Subscriptions2
  • World Clock Weekly$2.997 Days
  • Remote Work Yearly$14.991 Year
One-time1
  • UTC Converter Lifetime$29.99
3 purchases

ONE WATCH

Subscriptions2
  • Premium Monthly$2.991 Month
  • Premium Yearly$24.991 Year
One-time1
  • Premium Lifetime$99.99

Questions

Is Time Zone Difference Planner free?
Time Zone Difference Planner is free to download, with in-app purchases available.
Is ONE WATCH free?
ONE WATCH is free to download, with in-app purchases available.
Do Time Zone Difference Planner or ONE WATCH have ads?
Neither Time Zone Difference Planner nor ONE WATCH shows ads.
Which is updated more often, Time Zone Difference Planner or ONE WATCH?
Time Zone Difference Planner ships an update every 4 months, and ONE WATCH every 3 days. Most recently, Time Zone Difference Planner was updated on October 31, 2026 and ONE WATCH on November 10, 2026.

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