# AEI Keyboard Note Dutch vs ThetaCalc

The clearest difference is update cadence: ThetaCalc at every 3 months against AEI Keyboard Note Dutch's every 31 months. AEI Keyboard Note Dutch's advantage is iOS requirement (15.6 vs 17.6). 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.

AEI Keyboard Note Dutch ships an update every 31 months, ThetaCalc every 3 months. The most recent releases landed on October 27, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | AEI Keyboard Note Dutch | 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 31 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 3 MB | 1 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Toshihiro Nakane](https://appshunter.io/developer/6799290769) | [Felix Stehli](https://appshunter.io/developer/1521614638) |

## What reviewers say

### AEI Keyboard Note Dutch

[App page](https://appshunter.io/ios/app/aei-keyboard-note-dutch/id401703152)

**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 AEI Keyboard Note Dutch free?

AEI Keyboard Note Dutch is free to download, with no in-app purchases.

### Is ThetaCalc free?

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

### Do AEI Keyboard Note Dutch or ThetaCalc have ads?

Neither AEI Keyboard Note Dutch nor ThetaCalc shows ads.

### Which is updated more often, AEI Keyboard Note Dutch or ThetaCalc?

AEI Keyboard Note Dutch ships an update every 31 months, and ThetaCalc every 3 months. Most recently, AEI Keyboard Note Dutch was updated on October 27, 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.*