# Image Calculator vs ThetaCalc

The clearest difference is update cadence: ThetaCalc at every 3 months against Image Calculator's every 50 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Image Calculator ships an update every 50 months, ThetaCalc every 3 months. The most recent releases landed on October 19, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Image Calculator | ThetaCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (4 ratings)](https://appshunter.io/ios/app/thetacalc/id1521614636/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 50 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 372 MB | 1 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tomoki Hagano](https://appshunter.io/developer/1508301579) | [Felix Stehli](https://appshunter.io/developer/1521614638) |

## What reviewers say

### Image Calculator

[App page](https://appshunter.io/ios/app/image-calculator/id1508377385)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Image Calculator free?

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

### Is ThetaCalc free?

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

### Do Image Calculator or ThetaCalc have ads?

Neither Image Calculator nor ThetaCalc shows ads.

### Which is updated more often, Image Calculator or ThetaCalc?

Image Calculator ships an update every 50 months, and ThetaCalc every 3 months. Most recently, Image Calculator was updated on October 19, 2026 and ThetaCalc on October 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.*