Ask HN: Are there any LLM-based translation sites with excellent UI?

google translate or deepl are useful. The translation accuracy and speed are perfect, and the UI is excellent. However, deepl pro is a bit expensive and I would like to switch.

I think modern LLMs are better and some models can combine a response as fast as google translate and accuracy like deepl. However, it is tedious to go to sites like ChatGPT, type “please translate the following text” and wait for the tokens to be generated bit by bit. Do you know of any translation site with an architecture that directly wraps GPT or claude that combines UI, accuracy, and speed?

In particular, what we need is a UI that displays the translation immediately after copying a sentence (no translation button), and a feature that says, “If you paste an English sentence, it automatically becomes an EN->JA translation, and if you paste a Japanese sentence, it automatically becomes a JA->EN translation”.