Improve your Morse copying speed. No need to write everything down, you just have to find the most relevant info, be it the RST, the other operator's name, his QTH...

There's also a customizable Full QSO simulator below.

Full instructions available. Add Seiuchy to your phone or tablet and use it as an offline appNEW


Frequency: Hz   Speed: wpm   Volume: %

Your name:

Real place names only   |   Simulated key:

Categories:  Name  Rig  Call  Age  RST  QTH
 Job  Club Nr
This is what I'd log
Past QSOsLog

Full QSO Simulator

Show the text


Seiuchy is free of charge, doesn't use cookies or track you, doesn't require you to be always online: once the page is loaded, you should be able to use it as long as you wish even without an internet connection. No ads.

Seiuchy comes with no warranty implied.

Feel free to send me your comments, bug reports and feature requests to the following address: hb9fxw at uska dot ch. English isn't my mothertongue, so language/grammar corrections are welcome too.

Good luck, and have fun. Here, elsewhere or on the air. Long live CW!


Learn to ignore the padding and focus on what matters, what you should log. Headcopy isn't that hard, it's easy. Repetition of filler words will train you to recognize them on the air and ignore them too, allowing you to understand QSOs on the spot instead of having to write them before being able to understand them.

Choose your favourite sidetone pitch (in Hertz, from 200 to 1200), speed in wpm (from 5 to 50), input your name or keep the default "OM", uncheck some categories if you're not yet proficient in Morse. Press "Start" to start, or the "enter" key if your cursor is in the answer field.

Only enter the most relevant info. Don't write "43 years old", only "43". Only enter the information once, even when it's given twice. The most complex answers are in the "rig" category: there you have to enter it as it is sent ("tentec century 21", for example).

Press "enter" to validate your answer. You will hear a "C" if your answer is correct, and a "?" if it isn't. Your answer will be logged in red if it was wrong, in green if it was good. The whole exchange will also be logged, in the "Past QSOs" column.

You can ask for a repeat (or many repeats), but then your score won't increase if you answer correctly.

This software should work with recent browsers which support the Web Audio API. It has mainly been tested with Firefox, but should work with many other browsers (Internet Explorer doesn't respect standards, so I wouldn't be surprised there's no way to make it work for a while).

The "Full QSO" button below simulates a whole non-interactive QSO between two hams. It can get a bit silly, so don't fret if you hear HB4XXX Li-Chang the former clown in Stockholm, Brazil where it snows... Just follow along, there's nothing to type (and so the input field is disabled).

You can now choose the key and keying expertise level of the simulation. There are paddles, straight keys, bugs... The settings with an asterisk won't be used if you select "random". "Computer" is perfect sending, without any personality. Paddles give perfect element and inter-element ratios but the spaces between letters and words may vary. Straight keys may sound pretty random but I've heard and worked OMs even worse than "Straight key horror". "Precious snowflake" is computer sending, but with bad ratios set in the hope of standing out with an unusual swing. "Elmer" provides slightly longer spaces between characters, and much longer spaces between words but otherwise use perfect sending; it's aimed at beginners still hoping for a bit of help from Mr Farnsworth. Bugs and paddles can sometimes give you too many dots, especially in inexperienced (or drunk or sick) hands. Fortunately for you, Seiuchy won't transform U into V or B into 6; the bad news is that it will occasionally add a dot to a number or punctuation sign or prosign. With bad keying, words per minute will sometimes deviate from their rigid meaning. 20wpm with an untamed bug will feel more like 35 at times.

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Phone/tablet App

If you want to train your morse skills on the go, without a need for an internet connection, you have to install Seiuchy as a web application.

All the necessary data is copied once to your device and everytime you launch Seiuchy while online, the page/app is updated to the latest version.

The exact procedure depends on your operating system and language but usually it's a menu option in your browser that says something like "add this to your home screen". On my iPad, with Safari, it's in the sharing menu accessed through the "square with an arrow" icon. On my android phone, with Chrome, it's in the bottom of the list you see when you press the "three vertical dots" menu at the top of the screen.

If my explanations aren't enough, maybe this site explains it better.

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Planned features

I can't promise everything that follows will be implemented (some of them are nothing more than wishful thinking, let's be honest) but I'll try anyway.


25 Jun 2017, repeat option (doesn't increase score)

19 May 2017, Better geography. Some countries aren't fully implemented yet

17 May 2017, Realistic keying methods (SK, paddles, bug, cootie...) and various fixes

16 May 2017, Phone App Seiuchy now works offline too as an app if you "add this site to home screen" or something like that. Apple iOS and Android supported. Various improvements, mainly to "full qso" simulator.

14 May 2017, freq offset and BK in full qso, reset score link, fixes

27 Jan 2017, new categories, show full QSO text option

16 Jan 2017, better meteo model and answers

15 Jan 2017, optional constructed place names

14 Jan 2017, added full QSO mode, checks are less strict.

08 Jan 2017, improved design and code.

06 Jan 2017, improved compatibility, more names/places/rigs.

17 Jun 2016, various bugfixes, more variations in QSOs.

15 Jun 2016, first version of Seiuchy. It still needs some improvements, but it works on my computer, phone and tablet at least.

Other CW training resources



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