# TropoDX vs DitDah Decoder

The clearest difference is price: TropoDX at $1.99 against DitDah Decoder's $19.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

TropoDX costs $1.99 and DitDah Decoder $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

TropoDX ships an update every 6 weeks, DitDah Decoder monthly. Both last shipped on October 2, 2026.

## The numbers

| Metric | TropoDX | DitDah Decoder |
| --- | --- | --- |
| Price | **$1.99** | $19.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Size | 3 MB | 29 MB |
| Requires iOS | **17.6** | 18.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Martin Kuera](https://appshunter.io/developer/1846678892) | [Timothy Diehl](https://appshunter.io/developer/1859707586) |

## What reviewers say

### TropoDX

[App page](https://appshunter.io/ios/app/tropodx/id6754292117)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### DitDah Decoder

[App page](https://appshunter.io/ios/app/ditdah-decoder-morse-code-cw/id6756274811)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is TropoDX free?

TropoDX costs $1.99, with no in-app purchases.

### Is DitDah Decoder free?

DitDah Decoder costs $19.99, with no in-app purchases.

### Do TropoDX or DitDah Decoder have ads?

Neither TropoDX nor DitDah Decoder shows ads.

### Which is updated more often, TropoDX or DitDah Decoder?

TropoDX ships an update every 6 weeks, and DitDah Decoder monthly. Most recently, TropoDX was updated on October 2, 2026 and DitDah Decoder on October 2, 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.*