Relativity Calendar vs DayNumCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Relativity Calendar
This app redefines how you view dates by allowing you to express any day relative to any month. See custom dates like 'May 32nd' or 'March 93rd' at a glance. It offers home screen widgets and Apple Watch complications for easy access.
- Express dates relative to any month
- Home screen widgets with color customization
- Apple Watch complications
- iOS 16 Lock Screen widgets
- Track custom dates and holidays
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Relativity Calendar is an app that tells you what day it is, relative to any month. For example, June 1st can also be written as May 32nd or March 93rd. Set any month you want, and you'll be able to see it at a glance in your widgets and Apple Watch! Whether it's the month of your birth, an important holiday, or Truck Month, Relativity Calendar will (more or less) help you keep track. Features: - Pick any month, even if it doesn't make sense. Especially if it doesn't make sense. - Full support for home screen widgets, with full color customization - Full support for Apple Watch, including complications - Supports iOS 16 Lock Screen widgets.
DayNumCalc
This utility app provides quick access to date calculations, including finding the day number for any date, determining a date from a day number, calculating the difference between two dates, and checking the day of the week. It also offers widgets for convenient access on your home and lock screens.
- Calculate day number from date
- Determine date from day number
- Calculate days between two dates
- Add/subtract days from a date
- Check day of the week
- Home screen widgets
- Today View widgets
- Lock screen widgets
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DayNumCalc gives easy access to basic date calculations: - The current date/day number information is immediately available. Examples: day 1 = 1 January; day 365 = 31 December (non-leap year) or 30 December (leap year) - Date/day number calculations: get the day number from a chosen date, and a date from a paired year/day number - Calculate the number of days between two dates - Determine a date after adding or subtracting a number of days fro a chosen date - Check the day of the week for a date of your choice Widgets for the Home Screen, the Today View, and the Lock Screen are available for ease of use.
Screenshots
Verdict
The clearest difference is price: Relativity Calendar at Free against DayNumCalc's $0.99. Relativity Calendar also leads on update cadence (every 2 months vs every 6 months). On rating, review sentiment, ratings volume and ads 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
Relativity Calendar is free to download; DayNumCalc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.9 for Relativity Calendar against 4.8 for DayNumCalc. Both are backed by a comparable volume of ratings — 17 and 6 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Relativity Calendar ships an update every 2 months, DayNumCalc every 6 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.
| Parameter | Relativity Calendar | DayNumCalc |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.9 (17 ratings) — better | 4.8 (6 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 17 — better | 6 |
| Update frequency | Every 2 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Jonathan Cole | Mayra M Martinez |
Customer experience
Relativity Calendar
DayNumCalc
In-app purchases
Relativity Calendar
No in-app purchases
DayNumCalc
No in-app purchases
Questions
Is Relativity Calendar free?
Is DayNumCalc free?
Which has better reviews, Relativity Calendar or DayNumCalc?
Do Relativity Calendar or DayNumCalc have ads?
Which is updated more often, Relativity Calendar or DayNumCalc?
Other comparisons
