RPN Calculator 48 vs BASA Gliders
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPN Calculator 48
This app offers a scientific calculator with Reverse Polish Notation (RPN) functionality, providing an alternative to the default calculator. It features a large, easy-to-read display, a 100-entry stack, and extensive undo/redo capabilities. Its design is inspired by classic HP calculators.
- Reverse Polish Notation (RPN)
- Scientific calculator functions
- Swipe gestures for undo/redo
- 100 entry stack
- 6 memory buttons
- State saving on exit
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RPN Calculator 48 is a polished RPN replacement for Apple's calculator app: - Same scientific functionality as Apple's calculator app* - Use swipe gestures to undo and redo operations! - Starts quickly - Large buttons - Easy-to-read display - 100 entry stack - 6 memory buttons (A-F) - 50+ levels of undo/redo - Saves state on exit The ergonomics (screen and keyboard layout) of RPN Calculator 48 were inspired by HP's outstanding 48-series calculator. RPN Calculator 48 is made by the developer of tChess (the critically acclaimed iPhone chess game) and Learn Chess (the Apple Staff Favorite e-book). * This app is not an HP 48 emulator.
BASA Gliders
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The app includes a Weight & Balance calculator for gliders in the BASA club. The calculator determines whether the loading is within the allowed C.G. limits for the glider. Additionally, it displays all relevant information, such as tow speeds, limiting speeds, stall speeds for actual and reference mass, warnings, tire pressure, etc.
Screenshots
Verdict
The clearest difference is price: BASA Gliders at Free against RPN Calculator 48's $3.99. BASA Gliders also leads on update cadence (every 2 months vs every 14 months) and iOS requirement (16.6 vs 18.0). RPN Calculator 48's advantage is chart position (#112 vs unranked). On ads, in-app purchases and device support 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
BASA Gliders is free to download; RPN Calculator 48 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
RPN Calculator 48 ships an update every 14 months, BASA Gliders every 2 months. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.
| Parameter | RPN Calculator 48 | BASA Gliders |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.8 (245 ratings) — better | — |
| Positive reviews | 95.9% of reviews | — |
| Number of ratings | 245 — better | — |
| Update frequency | Every 14 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Best chart rank | #112 — better | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 18.0 | 16.6 — better |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Tom Kerrigan | Babu Srinivasan |
Bugs and requests
RPN Calculator 48
Reported bugs
1 issue- Display issues in landscape mode on iPad
Requested features
3 requests- Add haptic feedback for key presses
- Implement ability to recall previous calculations from stack
- Improve landscape mode support on iPad
BASA Gliders
Not enough reviews yet to summarise bugs or requests.
In-app purchases
RPN Calculator 48
No in-app purchases
BASA Gliders
No in-app purchases
