Comparison

User Calendar vs when

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

Head to head
About

User Calendar

A versatile calendar app for managing work, vacations, and reminders. It offers Gregorian and Lunar calendar views, customizable alerts, and cloud storage for settings. Supports a wide range of countries and allows for custom holiday designations.

Highlights
  • Gregorian and Lunar calendar query
  • Customizable reminders with color-coding
  • System calendar integration
  • Cloud storage for settings
  • Customizable holidays and workdays
  • Country-specific calendar information
Features
Read full description

This is a powerful calendar program that allows you to customize the date of work and vacation, set various reminders, integrate system calendars, and store settings in the cloud space. 1.Gregorian and Lunar Query 2.Customize reminders for different colors of the Gregorian or Lunar calendar 3.Integrating system calendars, you can view system calendars directly 4.User-set calendars can exist in the cloud space of a personal account, and the change is not lost 5.Interval reminder 6.You can add special dates to the system calendar. The display will be distinguished by different colors, or you can hide other system calendars to distinguish between work and family trips 7.Reminder for weekdays (not counting holidays) 8.Users can customize vacation or non-holiday features 9.Astrology calendar 10.You can choose which country's calendar information to display, List of supported countries : If the country is not on the list, or the holiday is different because of different regions, you can also customize which day is a holiday or non-holiday 1.Taiwan 2.China 3.Hong Kong 4.Macau 5.Malaysia 6.Singapore 7.Japan 8.South Korea 9.Philippines 10.Vietnam 11.India 12.Canada 13.France 14.Germany 15.Austria 16.Switzerland 17.Czech Republic 18.Australia 19.Netherlands 20.Belgium 21.Luxembourg 22.Spain 23.Argentina 24.Paraguay 25.Mexico 26.Chile 27.Costa Rica 28.Portugal 29.Brazil 30.Italy 31.Ireland 32.United Kingdom 33.New Zealand 34.United States

About

when

Easily calculate dates and durations with a smart, intuitive interface. Avoid errors with dedicated input pads and clear, readable fonts. Designed for quick and stress-free date calculations.

Highlights
  • Smart date and duration calculation
  • Dedicated input pads for accuracy
  • OCR font style for readability
  • Quick error display
  • Customizable icons (iOS 10.3+)
  • Dark theme support
Features
Read full description

Counting days and checking dates is surprisingly common in the workplace. However, it can be surprisingly stressful. This app calculates dates and durations easily and smartly with few operations. For those rare occasions, we have prepared a simple date calculator. . We are still trying our best to be ad-free. Achieve rapid results -. Use the Calendar PAD, Numeric PAD, Calendar PAD to set the date instead of rotating the date meter. ・The dedicated PAD prevents erroneous input and reduces input errors. - Show errors quickly. - Numbers are easy to read with OCR font style. About operation ・You can change by touching each item. ・To erase PAD, confirm with ENTER, input end, swipe down ・There is no calculation button. Notes about this app - before January 1, 1870. Round to January 1, 1870. ・When you press the calendar mark of the day of the week, the calendar PAD will appear. ・If the calculation result exceeds 9999 AD, the input value will be restricted. • Make the end of the month absurd (for example, 31st). The "months" displayed in the period calculation are calculated with the "months" up to the same day as the start date of the period. Months that do not have the same day as the start date are treated as "months" up to the last day. (The number of days in the month changes) Example) January 30, 2020 to March October 2020 = January 30th to February 29th → 1 month, February 29th to March 10th → 10th, March 3, 2020 to May 5, 2020 = March 3rd to May 5th → 2 months From May. 3rd to May 5th → 2 days *Excludes end date. About app settings Press the gear on the topscreen or go to [Settings] > [When] to open settings screen. About icons ・Icons can be changed on iOS 10.3 or higher ・If you switch the dark theme ON/OFF in the settings, the icon's color will change too.

Screenshots

User Calendar4 screens
when4 screens

Verdict

The call

The clearest difference is ads: when at none against User Calendar's shown. when also leads on update cadence (every 10 days vs every 5 weeks) and monetization model (free vs ad-supported). On price, rating, ratings volume 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for User Calendar against 5.0 for when. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

User Calendar ships an update every 5 weeks, when every 10 days. The most recent releases landed on August 9, 2026 and June 4, 2026 respectively.

Scorecard4 real differences · 5 level
User Calendar versus when: the parameters behind the verdict, then further details
ParameterUser Calendarwhen
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Number of ratings11
Update frequencyEvery 5 weeksEvery 10 days — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.09.0 — better
Further details — not scored
Size13 MB3 MB
Age rating4+4+
DeveloperYihang Huanguto toshiki

Customer experience

User Calendar

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

when

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

User Calendar

No in-app purchases

None

when

No in-app purchases

Questions

Is User Calendar free?
User Calendar is free to download, with no in-app purchases.
Is when free?
when is free to download, with no in-app purchases.
Which has better reviews, User Calendar or when?
User Calendar and when are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do User Calendar or when have ads?
User Calendar shows ads; when does not.
Which is updated more often, User Calendar or when?
User Calendar ships an update every 5 weeks, and when every 10 days. Most recently, User Calendar was updated on August 9, 2026 and when on June 4, 2026.

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