Before you buy
Can this phone read an NFC Spark?
Press the button and we will ask this phone’s NFC reader directly. Chrome will ask your permission first — that is the only way to get a real answer rather than a guess, and nothing is read from any tag.
The NFC Spark needs a phone with an NFC reader. Most mid-range and flagship phones have one; many budget Android phones do not.
Either key does the same job. The Bluetooth Spark works on any phone that runs the app; the NFC one is cheaper and needs a reader. If this check cannot give you a definite yes, buy the Bluetooth one.