GPS Astro vs DayNumCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GPS Astro
This utility app calculates astronomical events like sunrise, sunset, moonrise, and moonset. It supports current or selected locations and displays moon phases and twilight times. Users can save multiple locations and sync events to their calendar.
- Sunrise/sunset times
- Moonrise/moonset times
- Moon phases
- Twilight times
- Save multiple locations
- Calendar sync
Read full descriptionHide full description
GPS Astro is a utility for the iPhone, iPad and iPod Touch that calculates predicted sunrise, sunset, moonrise, moonset times, moon phases as well as civil, nautical and astronomical twilight depending on your current GPS location or for a selected location. Features: • Save multiple locations • Calendarsync of upcoming moon phases and single moon events • Timezone selection • iPad Split View Support
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
Read full descriptionHide full description
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: GPS Astro at free against DayNumCalc's paid. GPS Astro also leads on update cadence (monthly vs every 6 months) and ratings volume (117 vs 6). DayNumCalc's advantage is review sentiment (100% vs 83%). 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
GPS Astro 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 — 4.8 for GPS Astro against 4.8 for DayNumCalc. That said, the two scores are not equally well evidenced: GPS Astro has 117 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 83% of GPS Astro's written reviews are positive against 100% of DayNumCalc's.
GPS Astro ships an update monthly, DayNumCalc every 6 months. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.
| Parameter | GPS Astro | DayNumCalc |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 4.8 (117 ratings) | 4.8 (6 ratings) |
| Positive reviews | 83.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 117 — better | 6 |
| Update frequency | Monthly — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 54 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Esirion AG | Mayra M Martinez |
Customer experience
GPS Astro
DayNumCalc
Bugs and requests
GPS Astro
Reported bugs
5 issues- 🐛 Moon rise/set times off by an hour
- 🐛 Cannot change language from German to English
- 🐛 Cannot change location in iOS 10
- 🐛 Requires location access even when app is not running
- 🐛 Moon phases rendered approximately, not true representation
Requested features
4 requests- 💡 More accurate moon rendering
- 💡 Monthly/yearly view
- 💡 Improved interface for dates and locations
- 💡 True moon phase representation
DayNumCalc
Not enough reviews yet to summarise bugs or requests.
In-app purchases
GPS Astro
No in-app purchases
DayNumCalc
No in-app purchases
