# ThetaCalc vs myUnits+

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.

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.

## The numbers

| Metric | ThetaCalc | myUnits+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (4 ratings)](https://appshunter.io/ios/app/thetacalc/id1521614636/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/myunits-plus/id1620108142/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 1 MB | 6 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Felix Stehli](https://appshunter.io/developer/1521614638) | [Pham Huu Phuong](https://appshunter.io/developer/1447471853) |

## What reviewers say

### ThetaCalc

[App page](https://appshunter.io/ios/app/thetacalc/id1521614636)

This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.

**Highlights:** Reverse Polish Notation (RPN) calculator, User-programmable functions, JavaScript equation support, Extensible functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### myUnits+

[App page](https://appshunter.io/ios/app/myunits-plus/id1620108142)

Easily convert between various units of measurement for length, weight, area, volume, speed, and temperature. This utility streamlines calculations for everyday needs.

**Highlights:** Unit conversion, Length conversion, Weight conversion, Area conversion, Volume conversion, Speed conversion, Temperature conversion

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ThetaCalc free?

ThetaCalc is free to download, with no in-app purchases.

### Is myUnits+ free?

myUnits+ is free to download, with no in-app purchases.

### Which has better reviews, ThetaCalc or myUnits+?

myUnits+ is rated higher. ThetaCalc averages 4.3 out of 5 from 4 ratings, while myUnits+ averages 5.0 from 1 ratings.

### Do ThetaCalc or myUnits+ have ads?

Neither ThetaCalc nor myUnits+ shows ads.

### Which is updated more often, ThetaCalc or myUnits+?

ThetaCalc ships an update every 3 months, and myUnits+ fortnightly. Most recently, ThetaCalc was updated on June 1, 2026 and myUnits+ on June 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*