ThetaCalc vs myUnits+
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.
myUnits+
Easily convert between various units of measurement for length, weight, area, volume, speed, and temperature. This utility streamlines calculations for everyday needs.
- Unit conversion
- Length conversion
- Weight conversion
- Area conversion
- Volume conversion
- Speed conversion
- Temperature conversion
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myUnits+ is an application that supports the convert of popular units of measurement. The application allows users to perform unit conversions quickly and easily. • Length. • Weight. • Area. • Volume. • Speed. • Temperature. - Facebook : www.facebook.com/PiEntertaimentLLC/ - Feedback : mypientertainment@gmail.com
Screenshots
Verdict
The clearest difference is rating: myUnits+ at 5.0 against ThetaCalc's 4.3. myUnits+ also leads on update cadence (fortnightly vs every 3 months) and iOS requirement (15.6 vs 17.6). ThetaCalc's advantage is ratings volume (4 vs 1). On price, review sentiment, 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.
myUnits+ holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
ThetaCalc ships an update every 3 months, myUnits+ fortnightly. Both last shipped on June 1, 2026.
| Parameter | ThetaCalc | myUnits+ |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (4 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 1 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Felix Stehli | Pham Huu Phuong |
Customer experience
ThetaCalc
myUnits+
In-app purchases
ThetaCalc
No in-app purchases
myUnits+
No in-app purchases
