We are building a new computer system from the ground up, made to be usable by everyone. Every thing in it is named by a long number, and we want people to be able to say those names out loud, in any language. For that we need an alphabet of sounds that people everywhere can tell apart. This short test finds out which sounds those are. If you help, you can be credited by name or stay anonymous, and everything we learn is published. The longer story.
You will hear one short made-up word at a time, spoken by your browser, and pick which of two spellings you heard. There are 28 of them; it takes two to three minutes. Headphones help.
All three questions are optional. We collect nothing else about you: no IP address, no account, no tracking. Whatever you type in these boxes is published with the results, without your name.