I created my own translation app using llama3-80b, I call it "expat translator": I live outside of my home country and always struggled with using translators like Google Translate because they don't tell you if the way you're writing something feels natural in the other language. It gives me some pretty good results and I also instruct it to give me rewrites for informal and professional use, so I don't sound weird on WhatsApp for example.
It uses an on-device model for language detection and results are sub 0.3s thanks to groq
If someone wants to try: https://testflight.apple.com/join/GBxPMw2h