I'm looking for a French grammar checker. I think I'm in that intermediate-level plateau where I just need to keep talking / chatting in French but I want to eventually get to a point where I have correct grammar, maybe even some suggestions for idioms.

Some info for my use-case:

• I don't expect to go past 100 "consultations" a month.
• Would be nice if there was an extension that helps for email / Messenger / Telegram / WhatsApp.
• Would be nice if it did help with idioms.

I did my homework and found out that:

• Grammarly does offer this but only in English.
• Language Tool exists but it's 20 euros monthly or 60 euros per year, which are both steep prices for just trying it out.
• Asking ChatGPT works most of the time, but it's a bit annoying to load up that website every time and ask. I'm open to coding something based on the API if that would be the most cost-effective option.

Thanks in advance for all your suggestions!