For arXiv there's https://ar5iv.labs.arxiv.org https://ar5iv.labs.arxiv.org Currently HTML is available for sources up to March 2023, and you need to manually

For arXiv there's https://ar5iv.labs.arxiv.org https://ar5iv.labs.arxiv.org Currently HTML is available for sources up to March 2023, and you need to manually replace the X in the URL with a 5.