Excellent! Tested with English, Portuguese and Spanish.
Suggestion:
In Spanish and Portuguese, include an option to *globally* define the type of treatment that is intended: Informal or formal.

THIS APP IS VERY, VERY EXCELLENT AND SAFE...

Sehr zufrieden mit diesem Tool.

Muito bom. Já usava antes, via site. Agora, com a extensão, ficou ainda melhor!

Toujours un plus !

EXCELENTE GENIAL, EXTRAHORDINARIO.
FELICITACIONES

perfekt

Maravilhoso, vale cada centavo!

It recently started making the txt jump around when sending DMs in twitter rendering it unusable. Before that I preferred it to the more popular one

This is the best language tool out there for Portuguese, Spanish and English. As I've only used with these three, I can only review for them.

Je trouve ce module très intéressant. Il offre une aide précieuse lorsqu'on ne sait pas écrire un mot ou quand on a un trou de mémoire.
La seul chose qui n'est pas pratique, c'est que le module ne fonctionne pas sur tous les sites...

This is a fantastic proof checker. It detects multiple languages, which is super convenient as I always jump between English and German text. Bonus points that it also supports German (Switzerland)

My most favorite feature is that I can actually run the local server on my PC and connect the add-on to my local server. I know that the devs don't take donations as it was too low But if there was, I would totally do that since I'm dodging the Premium feature with running it locally and I feel bad for it since this tool helps me a lot all the time!

Super!