# GPS Astro vs DayNumCalc

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.

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.

## The numbers

| Metric | GPS Astro | DayNumCalc |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | [4.8 (117 ratings)](https://appshunter.io/ios/app/gps-astro/id369884042/reviews) | [4.8 (6 ratings)](https://appshunter.io/ios/app/daynumcalc/id1633054306/reviews) |
| Number of ratings | **117** | 6 |
| Positive reviews | 83.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 months |
| Monetization | **Free** | Paid |
| Size | 54 MB | 1 MB |
| Requires iOS | **9.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Esirion AG](https://appshunter.io/developer/369884045) | [Mayra M Martinez](https://appshunter.io/developer/1633054308) |

## What reviewers say

### GPS Astro

[App page](https://appshunter.io/ios/app/gps-astro/id369884042)

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.

**Highlights:** Sunrise/sunset times, Moonrise/moonset times, Moon phases, Twilight times, Save multiple locations, Calendar sync

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Simple to use
- 📖 Clear to read
- 💰 Affordable price
- 🎣 Useful for planning outings
- ✅ Reliable and accurate

**What reviewers complain about**

- 🐛 Moon times inaccurate
- 🐛 Language not changeable
- 🔒 Location access required when not running
- 📉 Graphical moon phase approximation

**Reported bugs**

- 🐛 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**

- 💡 More accurate moon rendering
- 💡 Monthly/yearly view
- 💡 Improved interface for dates and locations
- 💡 True moon phase representation


### DayNumCalc

[App page](https://appshunter.io/ios/app/daynumcalc/id1633054306)

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.

**Highlights:** 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

**In-app purchases:** none


## Frequently asked questions

### Is GPS Astro free?

GPS Astro costs $0.99, with no in-app purchases.

### Is DayNumCalc free?

DayNumCalc costs $0.99, with no in-app purchases.

### Which has better reviews, GPS Astro or DayNumCalc?

GPS Astro and DayNumCalc are both rated 4.8 out of 5 on the App Store, from 117 and 6 ratings respectively.

### Do GPS Astro or DayNumCalc have ads?

Neither GPS Astro nor DayNumCalc shows ads.

### Which is updated more often, GPS Astro or DayNumCalc?

GPS Astro ships an update monthly, and DayNumCalc every 6 months. Most recently, GPS Astro was updated on October 13, 2026 and DayNumCalc on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*