You don't even need foreign languages to run into this problem. English is the only language I speak fluently, but I'm Australian. I'm also a programmer, and I have some american friends. So, depending on context sometimes I spell 'color' (programming or talking to Americans), and sometimes I spell 'colour' (talking to Australian friends and family). Same with behaviour / behavior, favour / favor, etc. The context for which spelling I decide to use is complicated. In the same document I might name the `getColor` function, but describe it as getting the colour of a pixel. I might have two chat windows open side-by-side with different people and in each window spell the same words differently.

All my devices insist on shaming me (or autocorrecting me) for one of those spellings. At this point it feels like a complete gamble which I'll get corrected on. I'm just slowly getting used to correcting the autocorrect. :(

When you said this it reminded me that css allows colors to be either ‘gray’ or ‘grey’. Which I’m glad because then I don’t have to fumble until I picked the right one. Though, I’ve learned to type hex colors (especially grey scale colors) intuitively now, so I usually use those a lot more than typed grays now.

SwiftKey seems to manage three languages (Finnish, Swedish, English) simultaneously pretty well. No need to explicitly switch language either, it figures out the current language as you type.

Yes, SwiftKey works almost perfect for me too in three languages scenario (Bosnian, English, Dutch).

The only thing it is confused about is the letter "i", which means "and" in Bosnian, and SwiftKey often capitalizes it where it shouldn't. Probably happens because I often mix Bosnian and English in the same message (instead of translating technical terms).

I have 3 languages in my GBoard. I've just arrived from a Spanish speaking country, and now when I try to write in Portuguese it still completes with spanish words. Sure they are are very similar languages.

Ditto on the SwiftKey recommendation: I have German, English and French always at my disposal.

I'm on the same boat, I'm Italian and speak Spanish a lot with friends, English is my daily language. The latest Google keyboard has helped but it's not nearly as good as T9 was.