The aluminum or brass thumb support can be slotted into the hot shoe of the Q3 for improved ergonomics. As well as ensuring a secure handling of the camera (especially during one-handed shooting and filming), the thumb support also enables longer exposure times.

The Leica Q3 camera accessories offer a range of color options and can be mixed and matched according to personal preferences. These include:

- Thumb support
- Hotshoe cover
- Soft release button
- Lens hood, round 
- Lens cap

All of these accessories come in three finishes: aluminum, black anodized or silver anodized, as well as brass, blasted.