What fits, item by item
Insta360 X4 Insta360 X Series USB-C Cable
ConfirmedInsta360 X4 Insta360 Bullet Time Cord
ConfirmedInsta360 X4 Insta360 Bullet Time Accessory
ConfirmedInsta360 X4 Insta360 X Series Cold Shoe
ConfirmedInsta360 X4 Insta360 X Series Upgraded Invisible Mic Cold Shoe (for RØDE Wireless GO)
ConfirmedInsta360 X4 Insta360 X5 / X4 Air Invisible Mic Cold Shoe (for RØDE Wireless GO)
Not compatibleInsta360 X4 Insta360 X5 / X4 Air Quick Reader
Not compatibleInsta360 X4 Insta360 X4 Quick Reader
ConfirmedInsta360 X4 Insta360 X3 Quick Reader
Not compatibleInsta360 X4 Insta360 X5 Utility Fast Charge Case
Not compatibleInsta360 X4 Insta360 X4 Air Utility Fast Charge Case
Not compatibleInsta360 X4 Insta360 X4 Fast Charge Hub
ConfirmedInsta360 X4 Insta360 X3 Fast Charge Hub
Not compatibleInsta360 X4 Insta360 X2 Fast Charge Hub
Not compatibleInsta360 X4 Insta360 X5 Thermo Grip Cover
Not compatibleInsta360 X4 Insta360 X4 Thermo Grip Cover
ConfirmedInsta360 X4 Insta360 X5 Standard Lens Guard
Not compatibleInsta360 X4 Insta360 X4 Air Standard Lens Guard
Not compatibleInsta360 X4 Insta360 X5 Premium Lens Guard
Not compatibleInsta360 X4 Insta360 X4 Air Premium Lens Guard
Not compatibleInsta360 X4 Insta360 X4 Premium Lens Guard
ConfirmedInsta360 X4 Insta360 X3 Premium Removable Lens Guard
Not compatibleInsta360 X4 Insta360 X5/X4 Lens Cap
ConfirmedInsta360 X4 Insta360 X3 Lens Cap
Not compatibleInsta360 X4 Insta360 X2 Lens Cap
Not compatibleInsta360 X4 Insta360 X5 Invisible Dive Case Pro
Not compatibleInsta360 X4 Insta360 X5 Invisible Dive Case
Not compatibleInsta360 X4 Insta360 X4 Air Invisible Dive Case
Not compatibleInsta360 X4 Insta360 X4 Invisible Dive Case
ConfirmedInsta360 X4 Insta360 X3 Invisible Dive Case
Not compatibleInsta360 X4 Insta360 X5 Mic Windshield
Not compatibleInsta360 X4 Insta360 X4 Air Mic Windshield
Not compatibleInsta360 X4 Insta360 X4 Mic Windshield
ConfirmedInsta360 X4 Insta360 X3 Mic Windshield
Not compatibleInsta360 X4 Insta360 X5 Utility Frame
Not compatibleInsta360 X4 Insta360 X4 Air Utility Frame
Not compatibleInsta360 X4 Insta360 X4 Utility Frame
ConfirmedInsta360 X4 Insta360 X3 Utility Frame
Not compatibleInsta360 X4 Insta360 X5 Foldable Utility Handle
Not compatibleInsta360 X4 Insta360 X4 Foldable Utility Handle
ConfirmedInsta360 X4 Insta360 X5 / X4 Air Mic Adapter
Not compatibleInsta360 X4 Insta360 X4 Mic Adapter
ConfirmedInsta360 X4 Insta360 X3 Mic Adapter
Not compatibleInsta360 X4 Insta360 Mic Adapter (Vertical Version)
Not compatibleInsta360 X4 Insta360 X5 Carry Case
Not compatibleInsta360 X4 Insta360 X4 Air Carry Case
Not compatibleInsta360 X4 Insta360 X4 Carry Case
ConfirmedInsta360 X4 Insta360 X3 Carry Case
Not compatibleInsta360 X4 Insta360 X5 Screen Protector
Not compatibleInsta360 X4 Insta360 X4 Air Screen Protector
Not compatibleInsta360 X4 Insta360 X4 Screen Protector
ConfirmedInsta360 X4 Insta360 X3 Screen Protector
Not compatibleInsta360 X4 Insta360 X5 Cooling Screen Protector
Not compatibleInsta360 X4 Insta360 X4/X5 Dive Case Anti-Fog Insert
ConfirmedInsta360 X4 Insta360 X5 Water Sports Rope Mount
ConfirmedInsta360 X4 Insta360 X4 Air Water Sports Rope Mount
Not compatibleInsta360 X4 Insta360 X4 Water Sports Rope Mount
ConfirmedInsta360 X4 Insta360 X3 Water Sports Rope Mount
Not compatibleInsta360 X4 Insta360 X5 All-Weather USB Charging Cover
Not compatibleInsta360 X4 Insta360 X4 Air All-Weather USB Charging Cover
Not compatibleInsta360 X4 Insta360 X5 / X4 Air Vertical-Horizontal Mount
Not compatibleInsta360 X4 Insta360 X4 Vertical-Horizontal Mount
ConfirmedKeep each reader and charging entry independent
The manufacturer lists the X4 Quick Reader as supported for X4. Both the X3 Quick Reader and X5 / X4 Air Quick Reader are not supported. This closes the named reader question without guessing from connector appearance.
The X4 Fast Charge Hub is supported for X4. The X5 Utility Fast Charge Case is not. Check the exact accessory line rather than carrying one successful pairing across the rest of a kit.
Two useful cross-generation exceptions
The table supports the X5/X4 Lens Cap for X4. It also supports the specifically named X5 Water Sports Rope Mount for X4, despite the newer model name on that item. Do not change that explicit result into a blanket rejection based on the name.
Conversely, a supported mount pairing does not certify every water activity or load. The fit table answers whether the named accessory is supported; its operating limits need the accessory’s own instructions.