Direct codes
The link is written straight into the code. Nothing in between, nothing to expire.
permanent · trackable
QR codes that keep working, long after the poster goes up.
Turn any link into a code that never expires. Or use a tracked code, which passes through your own short link first so every scan gets counted.
Tracked codes
Scans hop through a short link of yours and land on the destination, while the total and the last scan time are recorded.