13.56Mhz MIFARE Ultralight EV1 NXP Contactless Blank Plastic NFC Key Card

Did not work. The UID is not magic

Worked perfectly. I really believe that all the 1-star reviews weren't able to find the proper instructions to make these work. Formating the cards using NFC Tools is only the first step--they still won't be able to be written onto directly by the Yoto app, but I won't pretend to be knowledgeable enough to know why. After formatting, you must link a playlist to a legitimate Yoto MYO card, then use NFC Tools to copy the information from the legit MYO to these generic cards. This may require the paid version of NFC Tools--it did for me on iOS, but it was $4 well-spent. For more detailed instructions, go to the /r/moreyoto subreddit. Have fun!

Buy these, go on reddit for the instructions on how to use these cards with the yoto. Saves a ton of money, works great.

Worked exactly as expected!! Use for making my own Yoto cards. No issues at all

I ordered these as a cheaper DIY option for making MYO Yoto cards for my daughter for christmas. They are less than half the price of the official MYO Yoto cards. They aren't quite as nice because you can't link the cards using the Yoto, but reddit had a good post on how to link the cards!

Attempted to duplicate NFC card that was confirmed as functioning. Checked all cards purchased and none could be copied onto. Checked other writable cards, to verify that it wasn't a device issue. Will be returning for a refund.