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SpineBones
Jembrana, Bali, Indonesia
What it is
SpineBones is a free 2D skeletal animation editor for building rigs, keying motion, and exporting animation assets. Its rigging tools include bone hierarchies, re-parenting, grouping, and inverse kinematics. In SETUP mode, users establish a base pose; ANIMATE mode holds keyframes for position, rotation, and scale. Timeline tools cover keyframe editing and looping, easing per key, and audio tracks. Slots can use PNG, JPG, SVG, or WebP artwork, including multiple attachments and frame-by-frame swaps. Users can also deform attachment meshes with keyed vertices and view neighboring poses with onion skin. Exports include WebM video, transparent PNG sequences, and sprite sheets with atlas data for game engines and 2D frameworks. Projects can be saved as portable .sbn packages, and older .json files can be opened. An MCP bridge works with Claude and other MCP clients for rig and keyframe creation, frame-rate changes, and exports. The Free plan is free, with a 300-frame timeline and playback up to 120 FPS. It runs on macOS 12 or newer and Windows 10 or newer.
For and against
For
- Free to download without an account or licence key
- Supports inverse kinematics and mesh deformation
- Exports sprite sheets, PNG sequences, and WebM
- Portable .sbn projects and legacy .json support
- Works with Claude and other MCP clients
Against
- Runs only on macOS 12 or newer and Windows 10 or newer
- Free plan has a 300-frame timeline limit
The verdict
SpineBones offers rigging, timeline animation, mesh tools, and several export formats at no charge. Check the listed operating-system requirements and 300-frame timeline limit against your project needs.
Who it suits
SpineBones suits 2D animators creating skeletal animations for game engines, 2D frameworks, or compositing workflows. Its portable project packages and MCP bridge may also suit users who want to continue work on another machine or use MCP clients.
Plans and prices
Free
300-frame timeline · playback up to 120 FPS · WebM, PNG sequence, and sprite-sheet exports
Read 15 Oct 2026 · spinebones.agara.id
On the record
- Access and trial
- The app is free to download with no account, licence key, or trial timer.spinebones.agara.id · read 2 Oct 2026
- Agent integration
- Its MCP bridge works with Claude and other MCP clients to create rig elements and keyframes, rescale animation frame rates, and trigger exports.spinebones.agara.id · read 2 Oct 2026
- Animation modes
- SETUP holds the base pose and ANIMATE holds keyframes; the editor supports keying position, rotation, and scale.spinebones.agara.id · read 2 Oct 2026
- Artwork
- Slots can bind PNG, JPG, SVG, or WebP artwork, with multiple attachments per slot and frame-by-frame swapping.spinebones.agara.id · read 2 Oct 2026
- Artwork attachments
- Slots can use PNG, JPG, SVG, or WebP artwork, with multiple attachments and frame-by-frame swaps.spinebones.agara.id · read 15 Oct 2026
- Bone rigging
- The editor supports canvas bone-chain creation, re-parenting, grouping, and inverse-kinematics chains.spinebones.agara.id · read 15 Oct 2026
- Company fact
- An Agara Teknologi proposal names I Gst. Ngr. Ag. Pt. Kresna Putra as CEO/software developer and Ketut Pradipta Westika as CTO/software developer.hadir.agara.id · read 15 Oct 2026
- Download formats
- The itch.io download page lists a 3.2 MB Apple-silicon DMG and a 12 MB Windows executable.gevanni.itch.io · read 15 Oct 2026
- Exports
- Exports include WebM video, transparent PNG frame sequences, and sprite sheets with atlas data.spinebones.agara.id · read 15 Oct 2026
- Independent description
- The itch.io listing describes SpineBones as a lightweight desktop tool aimed at practical skeletal-animation work without unnecessary complexity.gevanni.itch.io · read 15 Oct 2026
- Independent export confirmation
- The itch.io listing states that projects can be exported as JSON, sprite sheets, or WebM video.gevanni.itch.io · read 15 Oct 2026
- Independent feature list
- The itch.io listing confirms bone hierarchies, parent-child rigs, slots, skins, setup and animate modes, keyframes, IK, groups, audio preview, and background references.gevanni.itch.io · read 15 Oct 2026
- Independent listing status
- The itch.io catalog marks SpineBones as released, authored by gevanni, and available for Windows and macOS.gevanni.itch.io · read 15 Oct 2026
- Installation documentation
- The itch.io page gives Windows installer steps and macOS DMG drag-to-Applications steps, including first-run security prompts.gevanni.itch.io · read 15 Oct 2026
- Intended use
- The maker describes sprite-sheet exports as sized for game engines and 2D frameworks, and PNG sequences as suitable for compositing tools.spinebones.agara.id · read 2 Oct 2026
- Keyboard controls
- Dedicated shortcuts cover posing, bones, transforms, setup and animate modes, playback, keyframes, saving, opening, and undo.spinebones.agara.id · read 15 Oct 2026
- Licence and account
- The official site says the app has no per-seat licence, account requirement, licence key, or trial timer.spinebones.agara.id · read 15 Oct 2026
- Limit: MCP packaging complaint
- A user reported that an older Windows build lacked the MCP server bundle required for the MCP server to start.gevanni.itch.io · read 15 Oct 2026
