Complex RPN Calculator vs Mathgra Math Grapher
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Complex RPN Calculator
This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.
- Complex number support
- Four-level stack
- Polar and rectangular formats
- State persistence
- 10 memory locations
- Scientific calculations
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Complex RPN Calculator is a scientific RPN calculator with a four stack whose native number is complex. You can view and enter numbers in both polar and rectangular formats. Complex RPN remembers its state between usages and has 10 memory locations.
Mathgra Math Grapher
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FEATURES: • Simple, intuitive UI for plotting math expressions • Enter formulas or functions in fields y1 to y5 • Expressions can be as simple as "x" or as complex as needed • Plot multiple functions at once and view them on the same graph • Built-in function keyboard includes: sin, cos, tan, log, sqrt, pow, and more • Enter values using custom keyboards: Numbers, Letters, Functions • Adjust graph range with Min/Max for x and y • Tap Edit to modify long formulas in a full-screen editor • Save and load formulas • Pan graph using arrow buttons • Zoom in and out with + and – Perfect for students, educators, and anyone who wants to explore math visually.
Screenshots
Verdict
The clearest difference is ads: Complex RPN Calculator at none against Mathgra Math Grapher's shown. Complex RPN Calculator also leads on iOS requirement (16.4 vs 18.0). Mathgra Math Grapher's advantage is update cadence (daily vs every 5 months). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Complex RPN Calculator ships an update every 5 months, Mathgra Math Grapher daily. The most recent releases landed on August 23, 2026 and June 3, 2026 respectively.
| Parameter | Complex RPN Calculator | Mathgra Math Grapher |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (22 ratings) — better | — |
| Positive reviews | 51.7% of reviews | — |
| Number of ratings | 22 — better | — |
| Update frequency | Every 5 months | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.4 — better | 18.0 |
| Further details — not scored | ||
| Size | 1 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | John Coddington | Hideyuki Inada |
Bugs and requests
Complex RPN Calculator
Reported bugs
6 issues- Mutes other apps when used
- Slow keyboard response after update
- X^3 calculation incorrect for large imaginary numbers
- App crashes on opening/button press (historical iOS 9 issues)
- App starts upside down in landscape on iPad (historical iOS 8 issue)
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- Unreadable fonts on iPad (historical version 1.2 issue)
Requested features
24 requests- Turn off key click sound
- Customize number display
- See the stack
- Fix slow entry response
- Fix imaginary number calculation (X^3)
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- Improve SwiftUI design (less whitespace)
- Show all stack levels
- Add angle function
- Add magnitude function
- Add 'Clear X' button
- Make RAD/DEG toggle button
- Single button for Sci/Eng/Fix/Raw modes
- Add '//' (parallel) function
- Add 'Module' button
- Change 'i' to 'j' for imaginary part
- Show stack levels
- Add log2 function
- Add logGamma function
- Smaller buttons
- Add complex conjugate button
- Add real part button
- Add imaginary part button
- Add modulo function
- Make app start faster
Mathgra Math Grapher
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Complex RPN Calculator
No in-app purchases
Mathgra Math Grapher
No in-app purchases
Questions
Is Complex RPN Calculator free?
Is Mathgra Math Grapher free?
Do Complex RPN Calculator or Mathgra Math Grapher have ads?
Which is updated more often, Complex RPN Calculator or Mathgra Math Grapher?
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