IZ2UUF Morse Koch CW

In-app purchases
924 reviews
Content rating
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About this app

- learn morse code reception on the go (train, commuting, car, walking, etc)
- supports Koch method with G4FON, LCWO or custom character sets
- supports the Farnsworth spacing (high speed characters with longer space between them)
- the hard-letters settings allow increasing the frequency of the letters harder for the user to recognize
- the auto hard-letters feature automatically increases the frequency of the letters last added to the Koch exercise
- high precision timing of dots. dashes and space
- all timings (dot/dash ratio, spacing, etc.) can be user set
- optionally different sidetone frequency for dots and dashes
- works also with the phone screen off, so execises can be done with the device in the pocket
- when an incoming call is received, the exercise is automatically paused
- a voice can can read each word after the CW transmission, to allow mentally check the reception without even looking at the screen
- international Text-to-speech can read the text after having been sent in CW
- long (alpha, bravo, etc.) or short (A, B, C, ...) voice samples are available
- a QSO generator generates random "standard" QSO using a database of 1116 first names and 544 cities related to the 31 most popular countries, with 560 real rig names, antenna types, WX and so on
- can read text from a file or copied and pasted from any source
- can transmit words or sentences randomly taken from a file (for example a list of proverbs or aphorisms)
- callsign generator with optional prefix and suffix generation
- exercise verification can be done by reading the screen, by typing the answers or by listening to a voice that dictates it
- over 100 international characters supported, including cyrillic
- full support of prosigns
- exercises can be configured and saved for fast retrieval
Updated on
Jul 17, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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This app may collect these data types
App info and performance
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

811 reviews
A Google user
February 18, 2019
I loved the prior version. learned my code quickly and easily. App upgraded itself, features no longer work, and even worse is that I can't copy the morse it generates. Boo Hiss. Time to find a new app. sometimes you just need to learn when to leave good enough alone. Update: I found what changed. The old version showed the character first, then the tone; the new version presents the tone, then the character. I reset the Koch level to the start, and advanced rapidly through the sequence with about 2 minutes at each level. After a few levels, I was able to advance two or three levels at a time. My speed is back as is my comprehension. Still a couple of small issues that I've communicated to the developer; but nothing major. Upgrading from 2 stars to 4.
27 people found this review helpful
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February 10, 2019
Hello Don. Did you try to uninstall the old version and install again the new one? Please, can you contact me at cw@iz2uuf.net? Thanks. Davide IZ2UUF
A Google user
March 4, 2019
I tried a lot of morse code apps. The best feature about this one is you can set it to speak the letters to you after playing the code. You don't have to watch the screen to see if you are correct. It is hands free. This has helped me hear the sound of the letter and not the individual dits and dahs. Options for speed, character spacing and word spacing. Letters, callsigns, qso's and custom text.
60 people found this review helpful
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A Google user