It would be amazing if bioRxiv and medRxiv were included! I was curious how bioRxiv compared in usage/size to arXiv, and dug through the stats on each site. Both sites report paper download stats, and arXiv is about 12x larger (~50+ million downloads/month vs 4 million downloads/month for bioRxiv).

Interestingly, the sites have grown at a similar rate. Going back to 2020, arXiv had 25+ million downloads/month and bioRxiv had ~2.1 million.

[1] https://arxiv.org/stats/monthly_downloads [2] https://api.biorxiv.org/reports/usage

Adding submissions stats:

1. arXiv, ~21k/month

2. bioRxiv, ~5k/month

3. medRxiv, ~1.3k/month

It would be interesting to see usage of other _xiv's and other pre-print publishers!

[1] https://arxiv.org/stats/monthly_submissions [2] https://api.biorxiv.org/reports/content_summary [3] https://api.medrxiv.org/reports/content_summary