Good Lock (Korean: 굿락) is a software suite to tweak and customize the user interface and experience on Samsung Galaxy devices.

[1] It is developed by Good Lock Labs in cooperation with Samsung, and can be downloaded from the Galaxy Store.

[2] Responding to customer demand, it was revived in 2018[3] for the Galaxy S7, S8, S9 and Note 8 lines running Android Oreo.

Some of the many modules available include:[6] The website 9to5Google wrote about the first version of Good Lock: "crazy, complex, and even brilliant in places".

[9] In 2021, Tom's Guide wrote that Good Lock is "the first app you should install on your Samsung Galaxy phone".