To me, the go-to answer used to be DeepL, but more recently it's Kagi Translate.
It's really accurate for languages I do speak (English to German and vice versa) and allows for recorded speech, although that seems to be reliant on clear talking (my first try of "Hello, what's going on?" was recorded as "Yo, what's going on?")

I stopped making assumptions based on logic in this world
That said, I’d love to hear about any good FOSS options too. The main issue with Lemmy is that most discussions only get attention for a short time after being posted — even the OPs vanish first.

I think the link is wrong, or at least not working for me.
Kagi does indeed look promising after a quick test. The options are particularly interesting. Thanks for sharing.
Only the requested captcha is bothering me.

I've been using kagi translate https://translate.kagi.com/

Thank you, it indeed was wrong. Apparently when I set the link to be translate.kagi.com it tried to send me to beehaw.com/translate.kagi.com
Weird but I fixed it now.

And yeah, the options are very neat! I don't have a captcha though, but that may be because I'm a paying subscriber to Kagi and thus logged in?

I just tried it out and it looks great. Do you have a subscription with them?

dict.cc looks cool - thanks for the recommendation

I've just looked up Wiktionary in Kiwix and it's available to download for offline use too. Just under 8GB.

Agree and yes! I happily pay around 100€ annually. Comes with quite a few good perks

• unlimited access to probably one of the best search engines (for search-engine-literate folk it's not necessarily that you'll magically find better websites, but the quantity of garbage-/AI-websites will just be heavily reduced and you won't have the problem that the first three or so links will be ads/sponsorships; it makes searching just feel nicer)
• customisable search (for example, I can generally rank search results for pinterest lower or outright block them to not even have them show up in the first place and instead boost results from beehaw)
• customisable and privacy-respecting AI bots only if you want to use them (from what I could find out, the AI bots always start every new conversation with a blank slate of you, no matter how much you've used Kagi or the LLMs before)
• Kagi Small Web, which is an initiative to basically push the "alive internet theory" by highlighting small blogs and personal websites of a whole range of people
• Kagi Universal Summariser, which is an AI summariser that works very well on just about any text you give it and, for the articles and papers I threw at it, doesn't tend to hallucinate stuff

It's ok ...

Beware it's not foss

I use translator app its offline foss app on fdroid