GPS Astro vs Big Button Calculator Pro
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
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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
Big Button Calculator Pro
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.
- Dual-line display
- Big buttons
- 18 color themes
- Multi-line input
- Gesture controls
- VoiceOver accessibility
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This is THE BEST calculator for iOS with big buttons and colorful backgrounds! ・Dual-line display - shows the input and result at the same time ・Percentage and backspace button ・18 color themes ・Multi-line input for really long equations ・Automatic scientific formatting ・VoiceOver accessibility ・Split View Gestures ・Swipe left on the display to backspace ・Swipe right on the display to clear ・Tap & hold on the result to copy ・Tap & hold on the input to move the cursor, copy, paste Customize ・Color Theme ・Sound URL Scheme: bigcalculatorpro://
Screenshots
Verdict
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.
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 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.
| Parameter | GPS Astro | Big Button Calculator Pro |
|---|---|---|
| Price | $0.99 — better | $9.99 |
| Rating | 4.8 (122 ratings) | 4.9 (477 ratings) — better |
| Positive reviews | 83.0% of reviews — better | 78.6% of reviews |
| Number of ratings | 122 | 477 — better |
| Update frequency | Monthly — better | Every 2 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 | 15.2 |
| Further details — not scored | ||
| Size | 54 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Esirion AG | Cider Software LLC |
Customer experience
GPS Astro
Big Button Calculator Pro
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
Big Button Calculator Pro
Not enough reviews yet to summarise bugs or requests.
In-app purchases
GPS Astro
No in-app purchases
Big Button Calculator Pro
No in-app purchases
Questions
Is GPS Astro free?
Is Big Button Calculator Pro free?
Which has better reviews, GPS Astro or Big Button Calculator Pro?
Do GPS Astro or Big Button Calculator Pro have ads?
Which is updated more often, GPS Astro or Big Button Calculator Pro?
Other comparisons
