Julianator vs DayNumCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Julianator
Easily convert dates between the Gregorian calendar and the Julian Day of Year (ordinal date). This tool is useful for systems that use day-of-year numbering, such as mainframes, military, and food industries. It offers a clean interface, monthly views, and widgets for quick access.
- Gregorian to Julian Day of Year conversion
- Julian Day of Year to Gregorian conversion
- Monthly calendar view
- Home Screen widgets
- Lock Screen widgets
- Watch app with complications
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This app converts a date between Julian Day of Year and Gregorian. For example, September 11, 2022 converts to 2022-254 and 2022-254 converts to September 11, 2022. This app will convert both directions. Julian Date for this app refers to the day-of-year number (more properly, the ordinal date) in the Gregorian calendar, often used in mainframe computer systems, the military, and the food industry. (Note: this app does not used the term Julian Date to refer to the astronomy definition which is calculated from 4713 BC) Features a simple clean interface with pickers for the dates. The app also features a monthly view allowing a quick view of both Gregorian and Julian days for the entire month. Widgets are available for both the Home Screen and the Lock Screen to display the current day of year. A Watch app is available that includes a date converter and complications to display the current day of year. Note: The app's icon does not change to reflect the current day. Privacy Policy: https://julianator.brightdaydigital.com/privacy Terms of Service: https://julianator.brightdaydigital.com/terms
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 monetization model: Julianator at free against DayNumCalc's paid. Julianator also leads on ratings volume (124 vs 6) and chart position (#195 vs unranked). DayNumCalc's advantage is review sentiment (100% vs 70%) and iOS requirement (15.5 vs 17.4). On price, rating, ads 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
Julianator costs $0.99 and DayNumCalc $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 — 4.7 for Julianator against 4.8 for DayNumCalc. That said, the two scores are not equally well evidenced: Julianator has 124 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 70% of Julianator's written reviews are positive against 100% of DayNumCalc's.
Julianator ships an update every 3 months, DayNumCalc every 6 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.
| Parameter | Julianator | DayNumCalc |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 4.7 (124 ratings) | 4.8 (6 ratings) — better |
| Positive reviews | 70.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 124 — better | 6 |
| Update frequency | Every 3 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Best chart rank | #195 — better | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 17.4 | 15.5 — better |
| Further details — not scored | ||
| Size | 4 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Bright Day Digital LLC | Mayra M Martinez |
Customer experience
Julianator
DayNumCalc
In-app purchases
Julianator
No in-app purchases
DayNumCalc
No in-app purchases









