ThetaCalc vs bcRPN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ThetaCalc
This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.
- Reverse Polish Notation (RPN) calculator
- User-programmable functions
- JavaScript equation support
- Extensible functionality
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ThetaCalc is a RPN (Reverse Polish Notation) calculator which can be extended by functions and equations programmed by the user in JavaScript.
bcRPN
This utility app functions as a Reverse Polish Notation calculator. It handles complex numbers and utilizes extended precision for all calculations, offering an unlimited stack depth and an undo feature for up to 10 operations.
- Reverse Polish Notation (RPN) input
- Complex number calculations
- Extended precision math
- Unlimited stack depth
- Undo functionality (up to 10 operations)
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This is a RPN (Reverse Polish Notation) Calculator. It supports complex numbers and uses extended precision math for all operations. The stack depth is unlimited. In case a mistake was made, up to 10 operations can be undone. RPN calculators work by entering the numbers on the stack first, then selecting the operation. For example to add 3 + 4, press: 3 Enter 4 +
Screenshots
Verdict
The clearest difference is rating: bcRPN at 4.8 against ThetaCalc's 4.3. bcRPN also leads on iOS requirement (15.0 vs 17.6). ThetaCalc's advantage is update cadence (every 3 months vs every 22 months) and review sentiment (100% vs 80%). On price, ratings volume, ads and in-app purchases 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.
bcRPN holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews complicate that: 100% of ThetaCalc's written reviews are positive against 80% of bcRPN's, so the app with the better star average is not the one people write more warmly about.
ThetaCalc ships an update every 3 months, bcRPN every 22 months. The most recent releases landed on June 1, 2026 and September 19, 2026 respectively.
| Parameter | ThetaCalc | bcRPN |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (4 ratings) | 4.8 (4 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 80.0% of reviews |
| Number of ratings | 4 | 4 |
| Update frequency | Every 3 months — better | Every 22 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Felix Stehli | Paul Wilkins |
Customer experience
ThetaCalc
bcRPN
In-app purchases
ThetaCalc
No in-app purchases
bcRPN
No in-app purchases
