Very Good; just a bit limited!
Does not support non latin alphabet languages
Response from developer
Hi Tristan, please contact us, this is interesting feedback, happy to work on this! The app should actually work with Japanese characters (it will hide characters instead of words or paragraphs), so please send us your text and we'll look into it and see if we need to implement a fix. But we can't answer you via app review, it's anonymous. Thanks Kevin