Budget? How many tracks? Midi sync needed? Also, an important one: do you need independent loop lenght per track?
Boss RC505 - RC202
Pigtronix Infinity
Electro Harmonix 95000 or 45000 or 22500, …
Ditto x4, x2, …
Boomerang,…
C&G Organelle
PiSound can for sure be configured to be a looper
…
Also multiple Ipad Apps
And desktop software
Ableton Live
Ambiloop
Mobius
Echoloop VST
Ambiloop
Giada zenaud.io
repetito