# Scientific Calculator++ vs ThetaCalc

The clearest difference is price: ThetaCalc at Free against Scientific Calculator++'s $2.99. ThetaCalc also leads on in-app purchases (none vs 2) and review sentiment (100% vs 67%). Scientific Calculator++'s advantage is rating (5.0 vs 4.3) and ratings volume (21 vs 4). On ads and device support there is nothing between them.

ThetaCalc is free to download; Scientific Calculator++ costs $2.99 up front. Scientific Calculator++ sells 2 one-off in-app purchases. ThetaCalc asks for nothing beyond the download.

Scientific Calculator++ holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Scientific Calculator++ has 21 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 67% of Scientific Calculator++'s written reviews are positive against 100% of ThetaCalc's, so the app with the better star average is not the one people write more warmly about.

Scientific Calculator++ ships an update every 38 months, ThetaCalc every 3 months. The most recent releases landed on October 23, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Scientific Calculator++ | ThetaCalc |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (21 ratings)](https://appshunter.io/ios/app/scientific-calculator-plus-plus/id581543619/reviews)** | [4.3 (4 ratings)](https://appshunter.io/ios/app/thetacalc/id1521614636/reviews) |
| Number of ratings | **21** | 4 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 3 MB | 1 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Dogahe](https://appshunter.io/developer/468657946) | [Felix Stehli](https://appshunter.io/developer/1521614638) |

## What reviewers say

### Scientific Calculator++

[App page](https://appshunter.io/ios/app/scientific-calculator-plus-plus/id581543619)

This powerful calculator app offers advanced functions for complex calculations, including fraction manipulation, angle conversions, and equation solving. It features a history of your calculations and a user-friendly interface designed for iPad.

**Highlights:** Calculation history, Fraction manipulation, Angle conversion (degrees, minutes, seconds), Permutation and combination calculations, LCM and GCD, Equation solver, Coordinate conversion

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| List Size Plus | $0.99 | one-time |
| Quadratic Plus | $0.99 | one-time |


### 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


## Frequently asked questions

### Is Scientific Calculator++ free?

Scientific Calculator++ costs $2.99, and also offers in-app purchases.

### Is ThetaCalc free?

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

### Which has better reviews, Scientific Calculator++ or ThetaCalc?

Scientific Calculator++ is rated higher. Scientific Calculator++ averages 5.0 out of 5 from 21 ratings, while ThetaCalc averages 4.3 from 4 ratings.

### Do Scientific Calculator++ or ThetaCalc have ads?

Neither Scientific Calculator++ nor ThetaCalc shows ads.

### Which is updated more often, Scientific Calculator++ or ThetaCalc?

Scientific Calculator++ ships an update every 38 months, and ThetaCalc every 3 months. Most recently, Scientific Calculator++ was updated on October 23, 2026 and ThetaCalc on October 29, 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.*