BoneSmith Pro

BoneSmith Pro is the complete 2D skeletal animation studio for game developers — full rigging, posing, and keyframe animation with Spine JSON export.

Everything in the free demo, unlocked: unlimited bones, unlimited animations, Spine JSON (3.8) export, animated GIF export, and Motion Retarget — steal an animation from one rig for another, with root-motion scaled by leg ratio and auto-retime.

Rig 2D characters with Spriter-style sprite-part bones, pose with FK dragging and two-bone IK, animate on the keyframe timeline with easing and onion-skin, and export Spine JSON, PNG sprite sheets, and animated GIFs. Includes 4 starter rigs (Knight, Slime, Bird, Robot).

One-time purchase of $9.99 USD — yours forever. 100% offline, single portable tool; your art never leaves your machine.

Try before you buy: the free BoneSmith demo (https://theluckyduck666.itch.io/bonesmith) includes rigging, posing, and animation with demo limits (8 bones, 1 animation, sprite-sheet export only, capped at 8 frames).