# Selcall Selective Calling Tone vs TropoDX

The clearest difference is update cadence: TropoDX at every 6 weeks against Selcall Selective Calling Tone's every 4 months. TropoDX also leads on price ($1.99 vs $2.99). Selcall Selective Calling Tone's advantage is iOS requirement (12.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

Selcall Selective Calling Tone costs $2.99 and TropoDX $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Selcall Selective Calling Tone ships an update every 4 months, TropoDX every 6 weeks. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Selcall Selective Calling Tone | TropoDX |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | **[3.3 (15 ratings)](https://appshunter.io/ios/app/selcall-selective-calling-tone/id547030339/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 2 MB | 3 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [Martin Kuera](https://appshunter.io/developer/1846678892) |

## What reviewers say

### Selcall Selective Calling Tone

[App page](https://appshunter.io/ios/app/selcall-selective-calling-tone/id547030339)

Generate various selective calling tones for communication. Choose from over 20 tone types, queue multiple tones for burst transmission, and customize tone durations and gaps. Store frequently used sequences for quick access.

**Highlights:** Over 20 tone types, Tone queuing and burst transmission, Customizable tone duration and gap, Memory for storing tone sequences, CTCSS continuous tone generation, CODAN mode for priority calls

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

**In-app purchases:** none


### TropoDX

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Selcall Selective Calling Tone free?

Selcall Selective Calling Tone costs $2.99, with no in-app purchases.

### Is TropoDX free?

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

### Do Selcall Selective Calling Tone or TropoDX have ads?

Neither Selcall Selective Calling Tone nor TropoDX shows ads.

### Which is updated more often, Selcall Selective Calling Tone or TropoDX?

Selcall Selective Calling Tone ships an update every 4 months, and TropoDX every 6 weeks. Most recently, Selcall Selective Calling Tone was updated on November 1, 2026 and TropoDX on October 28, 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.*