A wearable sitting-posture assisting device with includes at least one leg unit that defines at least one longitudinal leg axis, and includes at least one foot unit that is configured for a connection of a shoe and/or a foot of a person, wherein the foot unit includes at least one shoe adapter and at least one shoe connector, which are couplable with one another at least transversely to the at least one at least one longitudinal leg axis, wherein the wearable sitting-posture assisting device includes a quick coupling which is configured for a tool-less coupling of the shoe adapter and the shoe connector with each other, wherein the quick coupling includes at least one latch element that is configured at least partially to create a coupling of the shoe adapter with the shoe connector.