- [[qr codes]] tend to be black and white only, but there are some colorful alternatives:
	- [[jab]]
	- [[hccb]]
- note that [[qr codes]] don't *need* to be black and white; they can be made colorful, but don't actually use color to encode information even in that case.
	

https://twitter.com/flancian/status/1405974430048731140