They probably mean the German noun Blech (sheet metal), not the English interjection. TeX was designed with two main goals in mind: to allow anybody to produce high-quality books using a reasonable amount of effort, and to provide a system that would give exactly the same results on all computers, now and in the future. Wiktionary says the ch in blech is pronounced as either the k or x sound (the latter of which would be the correct one for LaTeX), whereas the ch in Brecht would be a ç, which rhymes with neither of the two. This app also supports LaTeX command autocomplete in the editor. Supports both plain TeX and LaTeX (*.tex), output PDF. It has a very straight forward user interface that can get you started in seconds. This app lets you write, compile and preview TeX documents right on your browser. You can easily view or edit your TeX, LaTeX file, you can also use it as TeX reader to open a raw TeX file.

You can choose a TeX file to edit from your computer or from Google Drive. So, it is not pronunced with a final 'x'. It is most often used for medium-to-large technical or scientific documents but it can be used for almost any form of publishing. It allows you to create and manage LaTeX file directly on your browser and generate a PDF. LaTeX, which is pronounced Lah-tech or Lay-tech (to rhyme with blech or Bertolt Brecht), is a document preparation system for high-quality typesetting. This app is a free LaTeX document(*.tex.) viewer, editor for your browser.

It allows you to create and manage LaTeX file directly on browser and generate a PDF. Free LaTeX viewer, editor for your browser.

Latex text editor pronunciation