This actually works on HTC One M7. Four stars since I tried this only once yet.
First tag I touched caused app to crash. Galaxy S5
Needs allot of work. Not Stable. I paid for this app expecting that I'd get support. After reporting countless bugs, have received NO replies or updates. It does write tags, but has some serious issue, so if you do purchase this app, just keep in mind that you'll encounter some serious bugs. SIDE NOTE. Doesn't work on Galaxy 5 and above or Nexus 7 and above due to a change in chips in those phones and all new phones. If you are going to use this app, turn off screen rotation or you'll have to start from the beginning. very frustrating if you're doing a large run of tags.
Simple and it works An NFC tag writer and reader that is compatible to almost any android snartphone.
Didn't actually write data Got a 'write successful' message but no data was written to the tag