DayNumCalc vs OnlyWeekNo.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
OnlyWeekNo.
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You can choose the first day of the week, like starting with Sunday or Monday? And you can also choose a rule for the first week of the year. Like ISO 8601, you can choose the first Thursday week as the 1st week, or January 1st as the 1st week, or else.
Screenshots
Verdict
The clearest difference is price: OnlyWeekNo. at Free against DayNumCalc's $0.99. OnlyWeekNo. also leads on update cadence (every 2 months vs every 6 months). DayNumCalc's advantage is in-app purchases (none vs 1) and ads (none vs shown). On 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
OnlyWeekNo. is free to download; DayNumCalc costs $0.99 up front. OnlyWeekNo. sells 1 one-off in-app purchase. DayNumCalc asks for nothing beyond the download.
DayNumCalc ships an update every 6 months, OnlyWeekNo. every 2 months. The most recent releases landed on September 10, 2026 and September 17, 2026 respectively.
| Parameter | DayNumCalc | OnlyWeekNo. |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.8 (6 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.5 — better | 16.0 |
| Further details — not scored | ||
| Size | 1 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Mayra M Martinez | Takenori Kabeya |
In-app purchases
DayNumCalc
No in-app purchases
OnlyWeekNo.
- Disable Advertising$0.49
