akeytsu vs LoongBones

akeytsu is a 3D character rigging, skinning and keyframe animation tool for animators, available on Windows and macOS. Its Auto-Rig creates a biped skeleton, skin weights and controls after the user places five hot points and selects spine and finger joints. A circular Spinner handles transforms and IK, alongside a hybrid IK-FK solver, reverse-foot controls, space switching, blendshapes and mirroring. Skin Bind uses two passes, including rigid zones and a delta-mush-powered algorithm; skin painting tools are also included. Projects use the native.AKT format, and the software interoperates through FBX while importing BVH and OBJ files. Integrations include game engines and 3D packages such as Unreal Engine 4, Unity, Godot, Maya and Blender. The maker recommends baking animation before export because other software cannot interpret its proprietary IK and RF controllers. A full-featured free trial lasts 30 days and is limited to one trial period per user; a free personal license is listed as renewable annually.

LoongBones is a 2D skeletal animation solution with an online editor and a runtime player. The browser-based editor uses HTML5 and canvas, so it requires no installation, and it can create, modify, and export animation data, images, frame sequences, and other digital assets. Its tools include mesh deformation, bone binding, inverse kinematics, collision, and mesh curve deformation. Imports include PSD files, images, texture atlases, LoongBones projects and data, and supported Spine files. Exports include animation formats, images, sprite sheets, and GIFs, with plugins for additional formats. The runtime plays LoongBones animation data and supports Egret, Cocos, PixiJS, Unity, and Unreal; it is described as open source, free to download, and MIT-licensed. The product also says it supports AI-generated animation and has integrated DeepSeek. A seven-day free experience includes 100M storage and up to 10 projects. Membership costs 19.90 CNY a month or 199.90 CNY a year. The listed platforms include Android, iOS, Linux, macOS, self-hosted, web, and Windows.