# SimpleCW: Morse Decoder — Morse & Digital Mode Chat

> Morse & Digital Mode Chat (iPhone/iPad app by Jeroen Rombouts.)

- Source: https://appshunter.io/ios/app/simplecw-morse-decoder/id6759712691 (this page in markdown: same URL + `.md`)
- Developer: [Jeroen Rombouts](https://appshunter.io/developer/1863358112)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 14 MB
- Languages: American English
- Released: 2026-03-05
- Data updated: 2026-09-21
- User reviews in markdown: https://appshunter.io/ios/app/simplecw-morse-decoder/id6759712691/reviews.md

## What is SimpleCW?

Read Morse and digital-mode signals from audio with SimpleCW (formerly HamChat). Tune one receiver, watch the waterfall, and follow decoded text in the transcript.

CW includes automatic tone acquisition or manual tuning, Otsu and Bayesian decoders, a live keying trace, speed estimates, and input-level feedback. An optional on-device ML CW decoder is included with Premium Modes Unlock on iOS 18 or later and macOS 15 or later. Decoder results depend on signal quality and sending style; Otsu is the default.

Receive CW, PSK31/63, MFSK, Olivia, and RTTY. Classical receive in every mode and CW transmit remain free. A three-minute trial lets you try other transmit modes. The existing one-time Premium Modes Unlock purchase adds unlimited digital-mode transmit and the optional ML CW decoder.

Use the microphone or a compatible audio interface. On Mac, System Audio can receive audio from other software with the appropriate system permission. Audio processing stays on the device. Copy or share the resulting transcript.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock TX Modes | $2.99 | one-time |



## Version history (last 5 releases)

### 0.6.0 — 2026-09-07

HamChat is now SimpleCW: Morse Decoder. Existing users keep their app and premium unlock.

A new single-receiver interface with a cyan waterfall, automatic or manual CW tuning, a live keying trace, input-level measurements, and copy confidence.

Choose Otsu or Bayesian CW decoding, or use the on-device ML decoder with Premium Modes Unlock on supported devices. Existing unlock owners receive the added premium features.

This update also fixes microphone sample-rate conversion, stale text after clearing or switching modes, the ML purchase sheet, and unsent-message handling when the transmit trial ends.

### 0.5 — 2026-07-15

Improved the CW decoder, and added some more robustness tweaks.

### 0.4 — 2026-05-12

- added a TTY mode
- fixed some audio device selection bugs

### 0.3 — 2026-05-03

Improved CW decoding: you can now choose between an Otsu decoder (good for machine-generated Morse) or a Bayesian decoder (for human-generated Morse).

### 0.2 — 2026-04-09

- Expanded MFSK modes
- Added Olivia modes
- General app stability improvement
- Improved CW decoder with bimodal histogram speed classification

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## More apps by Jeroen Rombouts

- [SimpleSSTV](https://appshunter.io/ios/app/simplesstv/id6756872709)
- [Pagina100 - Teletekst browser](https://appshunter.io/ios/app/pagina100-teletekst-browser/id6761632609)
- [SimpleFT8](https://appshunter.io/ios/app/simpleft8/id6768739415)
- [Bitpop Lo-Fi Camera](https://appshunter.io/ios/app/bitpop-lo-fi-camera/id6801849620)
- [Arch Carrier Instrument Lab](https://appshunter.io/ios/app/arch-carrier-instrument-lab/id6809535992)

All apps by Jeroen Rombouts: https://appshunter.io/developer/1863358112

## Related topics

[morse decoder](https://appshunter.io/ios/topics/morse-decoder)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-21.*