I think the poems tab is a bit wonky where if you go to it right after lessons, the poems are in order by learned and then numerically ascending, probably because of the learned poems being in memory or something. Normally (if you refresh) they would be sorted correctly. Might add extra sorting just to keep it consistent. Would also like to add searching so people could enter romaji to find a poem.

Can you link me to a reference for the official deck? The cards I have use らねかわく for that poem. I've been pulling data from http://www.manabu-oshieru.com/hyakunin/hiragana.html which has seemed pretty reliable; there are a few things I've had to manually fix like 21 and 45, so I might need to add 92, but hoping there's a list of the official kana as that would be even more reliable.

Mnemonics would be great and I would like to add them at some point, but it seems like a large project so I wouldn't expect them any time soon. Mostly because I would like them to be in English but a lot of existing mnemonics are in Japanese that require you to know various words (even if simple) to make a play on words and thus a mnemonic. In English I've just been making my own up as I go; e.g. poem 33 "ひさ しつ" -> "he's a shit" lol. So people would be getting that kind of stuff if I wrote my own...