RPN Calculator 48 vs Diver Tools
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.
Diver Tools
This app is a comprehensive dive planning tool for technical and rebreather divers. It offers customizable checklists, offline calculations for gas mixes and decompression, and historical data tracking for rebreather cells. Ensure safety and preparedness with this essential companion for every dive.
- Customizable dive checklists
- Offline dive calculations
- Rebreather cell historical readings
- Cave conditions reporting
- Equipment safety checks
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Experience the ultimate dive companion with Dive Genius! Designed for rebreather and technical divers, this app revolutionizes the way you prepare for your dives, ensuring safety and convenience every step of the way. Customizable Checklists: Say goodbye to paper-based checklists! Dive Genius allows you to create personalized checklists tailored to your specific needs. From equipment packing to dive plans, you can easily organize and manage all the essential details in one place. Now you control the order of checklist displays! No more relying on memory or risking incomplete preparations. Offline Calculations: Dive sites without internet access? No problem! Dive Genius comes equipped with a built-in calculator, empowering you to perform essential dive calculations even without an internet connection. From gas mixes to decompression stops, have all the vital calculations at your fingertips. Safety and Equipment Confidence: Ensure your dive equipment meets the highest standards with Dive Genius. Set your personal limits and rely on the app's checklists to avoid compromising situations with marginal equipment. Dive with confidence, knowing that you are fully prepared and equipped for a safe and enjoyable dive. Historical Cell Readings: For rebreather divers, Dive Genius offers unparalleled insights. Keep track of your rebreather cells' performance by reviewing the last four historical readings plus store vendor and lot details. Detect any unexpected changes and make informed decisions based on accurate data. Stay ahead of the curve and dive with peace of mind. Now with the ability to store 3, 4, 5 or 6 cells! Cave Conditions: See and report on the latest conditions in the caves! Don't miss out on the must-have app for tech divers and rebreather enthusiasts. Experience the convenience, safety, and reliability of Dive Genius today!
Screenshots
Verdict
The clearest difference is ads: RPN Calculator 48 at none against Diver Tools's shown. RPN Calculator 48 also leads on price ($3.99 vs $9.99) and ratings volume (245 vs 1). Diver Tools's advantage is update cadence (every 5 weeks vs every 14 months) and iOS requirement (16.0 vs 18.0). On rating, in-app purchases, monetization model 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
RPN Calculator 48 costs $3.99 and Diver Tools $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Diver Tools holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: RPN Calculator 48 has 245 ratings behind it against 1, so its average is the more settled of the two.
RPN Calculator 48 ships an update every 14 months, Diver Tools every 5 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.
| Parameter | RPN Calculator 48 | Diver Tools |
|---|---|---|
| Price | $3.99 — better | $9.99 |
| Rating | 4.8 (245 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 95.9% of reviews | — |
| Number of ratings | 245 — better | 1 |
| Update frequency | Every 14 months | Every 5 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #130 — better | — |
| Devices | iPhone | iPhone |
| Requires iOS | 18.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Tom Kerrigan | Michael Gibby |
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
Diver Tools
Not enough reviews yet to summarise bugs or requests.
In-app purchases
RPN Calculator 48
No in-app purchases
Diver Tools
No in-app purchases
