# GPS Astro vs Big Button Calculator Pro

The clearest difference is price: GPS Astro at $0.99 against Big Button Calculator Pro's $9.99. GPS Astro also leads on iOS requirement (9.0 vs 15.2). Big Button Calculator Pro's advantage is ratings volume (477 vs 122). On rating, review sentiment, update cadence and ads there is nothing between them.

GPS Astro costs $0.99 and Big Button Calculator Pro $9.99 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 4.9 for Big Button Calculator Pro. Both are backed by a comparable volume of ratings — 122 and 477 respectively. Written reviews are what separate them: 83% of GPS Astro's written reviews are positive against 79% of Big Button Calculator Pro's.

GPS Astro ships an update monthly, Big Button Calculator Pro every 2 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | GPS Astro | Big Button Calculator Pro |
| --- | --- | --- |
| Price | **$0.99** | $9.99 |
| Rating | [4.8 (122 ratings)](https://appshunter.io/ios/app/gps-astro/id369884042/reviews) | **[4.9 (477 ratings)](https://appshunter.io/ios/app/big-button-calculator-pro/id1131056963/reviews)** |
| Number of ratings | 122 | **477** |
| Positive reviews | **83.0% of reviews** | 78.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | **Free** | Paid |
| Size | 54 MB | 27 MB |
| Requires iOS | **9.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Esirion AG](https://appshunter.io/developer/369884045) | [Cider Software LLC](https://appshunter.io/developer/465180756) |

## 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


### Big Button Calculator Pro

[App page](https://appshunter.io/ios/app/big-button-calculator-pro/id1131056963)

A user-friendly calculator app featuring large, colorful buttons and a dual-line display for simultaneous input and result viewing. It supports long equations, offers customizable themes and sounds, and includes accessibility features.

**Highlights:** Dual-line display, Big buttons, 18 color themes, Multi-line input, Gesture controls, VoiceOver accessibility

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GPS Astro free?

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

### Is Big Button Calculator Pro free?

Big Button Calculator Pro costs $9.99, with no in-app purchases.

### Which has better reviews, GPS Astro or Big Button Calculator Pro?

Big Button Calculator Pro is rated higher. GPS Astro averages 4.8 out of 5 from 122 ratings, while Big Button Calculator Pro averages 4.9 from 477 ratings.

### Do GPS Astro or Big Button Calculator Pro have ads?

Neither GPS Astro nor Big Button Calculator Pro shows ads.

### Which is updated more often, GPS Astro or Big Button Calculator Pro?

GPS Astro ships an update monthly, and Big Button Calculator Pro every 2 months. Most recently, GPS Astro was updated on November 1, 2026 and Big Button Calculator Pro on November 2, 2026.

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