CW Morse practice oscillators


No ads, nags, or in-app purchases. No internet connection required. Fully functional offline Morse code app.

Certain settings on your Android device will curtail the sensitivity and performance of this app and should be turned OFF during its use. Default settings are recommended.

Two examples are Tap Duration and Ignore Repeated Touches (Settings > Accessibility > Interaction and Dexterity > Tap Duration/Ignore Repeated Touches).

Practice sending International Morse code with straight lever and iambic paddle CW Morse code practice oscillators app for Android smartphones and tablets. This app DOES NOT interface with your ham radio to provide a keying device.

Each practice oscillator translates International Morse code into Latin letters, Arabic numerals, punctuation, CW prosigns, and characters á, ch, é, ñ, ö, and ü in real time as you practice.

Practice sending Morse code with a straight lever oscillator. Settings include WPM, show/hide Morse code/text, choose sidetone 400Hz-800Hz. Adjust the WPM so that you can produce well formed DITs and DAHs at a comfortable speed.

Practice sending Morse code with an iambic paddle oscillator. Simply touch down on the DIT and DAH paddles instead of pinching, squeezing, or flinging the paddles. Settings include WPM, CW weight ratio, reverse paddles, show/hide Morse code/text, choose sidetone 400Hz-800Hz. Touch and hold both paddles to cycle between DIT and DAH and feel the iambic rhythm.

Here is a brief instruction on using an iambic paddle key to send Morse code:

Press and hold the Clear Code/Text button to adjust CW and Text label font sizes.

You may use a real straight key or iambic keyer with this app by connecting it to your Android device via an easily modified USB mouse.

This app may be of interest to amateur ham radio QRP and QRO operators, and CW Morse code or telegraph enthusiasts, preppers and survivalists.

If you would like to also practice sending Japanese Wabun CW Morse code, then please see my 和文モールス練習 Japanese Morse code practice oscillators app:

For 10-30 WPM CW Morse code training, please see my Koch Morse code trainer apps:
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What's New

WPM slider replaced with WPM -1 and WPM +1 controls. WPM and Morse code/text label font size saved between sessions.
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Additional Information

Eligible for Family Library
April 3, 2021
Current Version
Requires Android
2.1 and up
Content Rating
Offered By
PO Box 2428 Pensacola, FL 32513
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