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SPECIFICTION
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SpineBones

spinebones.agara.id

Free plan WindowsmacOSAPI
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Spec score 8.3 #14 of 48 in 2D Character Animation Software

What it is

SpineBones is a free 2D skeletal animation editor for creating bone rigs, keying motion, and exporting animations. Rigging includes hierarchies, re-parenting, grouping, and inverse kinematics. Its timeline supports keyframe insertion, movement, selection, copying, looping, per-key easing, and audio tracks. Slots accept PNG, JPG, SVG, and WebP artwork, with multiple attachments and frame-by-frame swaps. Attachment meshes can be deformed with keyed vertices, and onion skin shows neighboring poses. SETUP stores the base pose; ANIMATE keys position, rotation, and scale. Exports include WebM video, transparent PNG sequences, sprite sheets with atlas data, and portable .sbn packages; legacy .json projects open too. An MCP bridge supports Claude and other MCP clients for rig elements, keyframes, frame-rate changes, and exports. It runs on macOS 12+ and Windows 10+, with no account, licence key, or trial timer.

Spec sheet

What it does
SpineBones is a desktop editor for constructing 2D skeletal rigs, animating them with keyframes, and exporting animation assets.Read 15 Oct 2026 · spinebones.agara.id
Purpose
SpineBones is a 2D skeletal animation editor for building bone rigs, keying them on a timeline, and exporting animations.Read 2 Oct 2026 · spinebones.agara.id
Headquarters
Jembrana, Bali, IndonesiaRead 28 Sep 2026 · spinebones.agara.id
Founded
2020Read 28 Sep 2026 · spinebones.agara.id
Access and trial
The app is free to download with no account, licence key, or trial timer.Read 2 Oct 2026 · spinebones.agara.id
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.Read 2 Oct 2026 · spinebones.agara.id
Animation modes
SETUP holds the base pose and ANIMATE holds keyframes; the editor supports keying position, rotation, and scale.Read 2 Oct 2026 · spinebones.agara.id
Artwork
Slots can bind PNG, JPG, SVG, or WebP artwork, with multiple attachments per slot and frame-by-frame swapping.Read 2 Oct 2026 · spinebones.agara.id
Artwork attachments
Slots can use PNG, JPG, SVG, or WebP artwork, with multiple attachments and frame-by-frame swaps.Read 15 Oct 2026 · spinebones.agara.id
Bone rigging
The editor supports canvas bone-chain creation, re-parenting, grouping, and inverse-kinematics chains.Read 15 Oct 2026 · spinebones.agara.id
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.Read 15 Oct 2026 · hadir.agara.id
Download formats
The itch.io download page lists a 3.2 MB Apple-silicon DMG and a 12 MB Windows executable.Read 15 Oct 2026 · gevanni.itch.io
Exports
Exports include WebM video, transparent PNG frame sequences, and sprite sheets with atlas data.Read 15 Oct 2026 · spinebones.agara.id
Independent description
The itch.io listing describes SpineBones as a lightweight desktop tool aimed at practical skeletal-animation work without unnecessary complexity.Read 15 Oct 2026 · gevanni.itch.io
Independent export confirmation
The itch.io listing states that projects can be exported as JSON, sprite sheets, or WebM video.Read 15 Oct 2026 · gevanni.itch.io
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.Read 15 Oct 2026 · gevanni.itch.io
Independent listing status
The itch.io catalog marks SpineBones as released, authored by gevanni, and available for Windows and macOS.Read 15 Oct 2026 · gevanni.itch.io
Installation documentation
The itch.io page gives Windows installer steps and macOS DMG drag-to-Applications steps, including first-run security prompts.Read 15 Oct 2026 · gevanni.itch.io
Intended use
The maker describes sprite-sheet exports as sized for game engines and 2D frameworks, and PNG sequences as suitable for compositing tools.Read 2 Oct 2026 · spinebones.agara.id
Keyboard controls
Dedicated shortcuts cover posing, bones, transforms, setup and animate modes, playback, keyframes, saving, opening, and undo.Read 15 Oct 2026 · spinebones.agara.id
Licence and account
The official site says the app has no per-seat licence, account requirement, licence key, or trial timer.Read 15 Oct 2026 · spinebones.agara.id
Limit: MCP packaging complaint
A user reported that an older Windows build lacked the MCP server bundle required for the MCP server to start.Read 15 Oct 2026 · gevanni.itch.io
Limit: platform coverage
The published downloads and platform metadata cover only Windows and macOS.Read 15 Oct 2026 · gevanni.itch.io
Local operation
The itch.io notes say normal use needs no extra libraries and that exported files and projects are written locally.Read 15 Oct 2026 · gevanni.itch.io
MCP actions
MCP commands can create rig elements and keyframes, change animation frame rate, and start exports.Read 15 Oct 2026 · spinebones.agara.id
MCP editing depth
The itch.io documentation says MCP can add, rename, delete, reorder, re-parent, mirror, and transform bones and can batch keyframe operations.Read 15 Oct 2026 · gevanni.itch.io
MCP integration
The MCP bridge exposes rig, timeline, and export controls to Claude and other MCP clients.Read 15 Oct 2026 · spinebones.agara.id
MCP state access
The itch.io documentation says MCP can read bones, keyframes, skins, slots, attachments, IK roots, groups, camera, and timeline summaries.Read 15 Oct 2026 · gevanni.itch.io
MCP timeline controls
The itch.io documentation says MCP can change FPS, duration, current frame, playback range, and play or stop playback.Read 15 Oct 2026 · gevanni.itch.io
Mesh and onion skin
Users can deform attachment meshes with keyed vertices and view neighboring poses with onion skin.Read 2 Oct 2026 · spinebones.agara.id
Mesh deformation
Attachments can be converted to editable meshes whose vertices can be keyed over time.Read 15 Oct 2026 · spinebones.agara.id
News: MCP release
An April 4, 2026 announcement introduced live editor control through MCP for external agents and clients.Read 15 Oct 2026 · itch.io
News: onion skin
An April 2, 2026 devlog described onion-skin ghosts, an O shortcut, and pose comparison improvements.Read 15 Oct 2026 · itch.io
News: version 0.1.2
An April 4, 2026 announcement says version 0.1.2 added inverse kinematics, per-keyframe easing, and onion skin.Read 15 Oct 2026 · itch.io
Offline workflow
The maker describes the workflow as requiring no cloud round trip and allowing projects to move between machines in a package.Read 15 Oct 2026 · spinebones.agara.id
Onion skin
Onion skin displays neighboring poses around the current playhead for spacing and arc checks.Read 15 Oct 2026 · spinebones.agara.id
Project files
Projects can be saved as portable .sbn packages containing bones, slots, keys, and bundled images; legacy JSON projects can be opened.Read 15 Oct 2026 · spinebones.agara.id
Release response
The creator replied that the user had downloaded an older build and uploaded a newer one.Read 15 Oct 2026 · gevanni.itch.io
Rigging
It supports bone hierarchies, re-parenting, grouping, and inverse kinematics.Read 2 Oct 2026 · spinebones.agara.id
System requirements
The listed requirements are macOS 12 or newer and Windows 10 or newer.Read 15 Oct 2026 · spinebones.agara.id
Timeline
Its timeline supports inserting, moving, multi-selecting, copying, looping, and easing individual keyframes, with audio tracks.Read 15 Oct 2026 · spinebones.agara.id
Viewport
The preview uses a 16:9 frame and supports camera pan, zoom, and playback up to 120 FPS.Read 15 Oct 2026 · spinebones.agara.id
Workflow modes
SETUP stores the base pose while ANIMATE stores keyed motion for position, rotation, and scale.Read 15 Oct 2026 · spinebones.agara.id

Plans and prices

Free Free 300-frame timeline · playback up to 120 FPS · WebM, PNG sequence, and sprite-sheet exports Read 15 Oct 2026 · spinebones.agara.id

Every SpineBones plan and price →

Strong points and limits

Strong points

  • Free download with no account
  • Supports inverse kinematics
  • Exports WebM, PNG, and sprite sheets
  • Mesh deformation and onion skin
  • MCP bridge for animation tasks

Limits

  • 300-frame timeline on free plan
  • Playback limited to 120 FPS
  • Requires macOS 12+ or Windows 10+
  • No cloud round trip

Who it suits

SpineBones suits 2D animators targeting game engines, 2D frameworks, or compositing workflows. Its offline package format and MCP bridge also fit users who want local projects or client-driven automation.

Verdict

SpineBones provides a focused skeletal-animation workflow with mesh editing, frame-by-frame artwork, and several runtime-oriented exports. Its free limits are explicit, and projects can move between machines as portable packages.

Where Specifiction places it

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