Complex RPN Calculator vs Calculator HD Pro Lite
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.
Calculator HD Pro Lite
This app offers a user-friendly calculator with large buttons and extensive customization options. It features a dual-line display to see input and results simultaneously, saves your calculation history, and provides full scientific functions. Personalize layouts, themes, and even button symbols to suit your needs.
- Dual-line display
- Calculation history
- Full scientific functions
- Customizable layouts and themes
- Big buttons
- Email history
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A colorful calculator with big buttons, comprehensive features, and extensive customization. Used by millions. Supported by ads. SEE EVERY STEP ・Dual-line display - shows your input and result simultaneously ・Multi-line input for long equations ・Tap & hold to move the cursor or copy and paste where you want SAVE YOUR WORK ・History saves every calculation with time and date ・Label important calculations for easy reference ・Email single calculations or complete history ・Swipe down to review previous work CUSTOMIZE EVERYTHING ・6 layouts including extra-large button options ・10 color themes plus Dark Mode ・Adjustable font size and bold text ・Left-handed mode ・Show or hide features you don't need SCIENTIFIC FUNCTIONS ・Full scientific calculator when needed ・Memory buttons with values displayed ・Percentage and backspace buttons ・Automatic scientific notation ・VoiceOver accessibility OPTIONAL IN APP PURCHASES ・Today View Widget (iOS 17 and below) ・Multiple History Tapes ADDITIONAL FEATURES ・Customizable button symbols and decimal settings ・Multiple backspace button styles ・iPad Split View and 3D Touch support ・Gesture controls for quick access URL Scheme: calculatorhdprofree://
Screenshots
Verdict
The clearest difference is rating: Calculator HD Pro Lite at 4.6 against Complex RPN Calculator's 3.9. Calculator HD Pro Lite also leads on review sentiment (77% vs 52%) and ratings volume (52K vs 24). Complex RPN Calculator's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, in-app purchases, device support and iOS requirement 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.
Calculator HD Pro Lite holds the better App Store score, 4.6 against 3.9. That said, the two scores are not equally well evidenced: Calculator HD Pro Lite has 52K ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 52% of Complex RPN Calculator's written reviews are positive against 77% of Calculator HD Pro Lite's.
Complex RPN Calculator ships an update every 5 months, Calculator HD Pro Lite every 2 months. The most recent releases landed on October 31, 2026 and November 7, 2026 respectively.
| Parameter | Complex RPN Calculator | Calculator HD Pro Lite |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (24 ratings) | 4.6 (52K ratings) — better |
| Positive reviews | 51.7% of reviews | 77.1% of reviews — better |
| Number of ratings | 24 | 52K — better |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.2 — better |
| Further details — not scored | ||
| Size | 1 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | John Coddington | Cider Software LLC |
Customer experience
Complex RPN Calculator
Calculator HD Pro Lite
User reviews
Complex RPN Calculator
From 24 App Store ratingsWhat we love
- ✅ Great RPN functionality
- ✨ Complex number support
- 🆓 Free to use
- 🚫 No ads or in-app purchases
- 💻 Works on macOS
Room to improve
- 🎨 SwiftUI design is ugly
- 🐌 Slow keyboard response
- 🖱️ Clunky operation
- 📉 Complex number operations limited
- ⚠️ Broken on newer iOS versions (historically)
Calculator HD Pro Lite
From 52K App Store ratingsWhat we love
- 👍 Easy to use
- 📝 Keeps calculation history
- 💡 Customizable layout and themes
- 🔢 Large, clear numbers
- 🧮 Variety of functions (basic, scientific, etc.)
Room to improve
- 💢 Intrusive ads, especially between calculations
- 🙄 Ads that are difficult to close
- 🤦♂️ Ads that interrupt workflow
- 🤑 Expensive to remove ads
- 🚫 Gambling ads
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)
Show 19 moreShow fewer
- 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
Calculator HD Pro Lite
Reported bugs
3 issues- Calculation errors with very large numbers
- Crashes after recent update
- Decimal point displayed as comma
Requested features
5 requests- Dark mode option
- Ability to sync calculation history across devices
- More advanced math functions (e.g. dms/dd)
- Customizable button layout
- Ability to disable ads without paying
In-app purchases
Complex RPN Calculator
No in-app purchases
Calculator HD Pro Lite
No in-app purchases
Questions
Is Complex RPN Calculator free?
Is Calculator HD Pro Lite free?
Which has better reviews, Complex RPN Calculator or Calculator HD Pro Lite?
Do Complex RPN Calculator or Calculator HD Pro Lite have ads?
Which is updated more often, Complex RPN Calculator or Calculator HD Pro Lite?
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