User Calendar vs when
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- 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
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
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.
| Parameter | User Calendar | when |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 5 weeks | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Yihang Huang | uto toshiki |
Customer experience
User Calendar
when
In-app purchases
User Calendar
No in-app purchases
when
No in-app purchases








