After a few weeks of testing, I've become confident enough that the site works as advertised. It's still not completely feature-complete, but I don't know when I'll have time to add further features.
MAL still hasn't replied to my API whitelisting request, so MAL Sync is disabled for now. Other than that, everything should work fine.
Like always, if you find any bugs, errors, or have ideas and suggestions on how to improve this site, feel free to tell me! Just write an e-mail to 
Hope you find Monthly.moe useful!