by Ciyorie·Modeling
Images © Ciyorie. Used for product review; image policy.
Shape Key Mirror Plus earns its place in the Blender Extensions library for targeting a specific pain point: the errors that appear in Blender's default shape key mirroring on complex multi-part meshes. The 1.9.0 update also tidied the workflow by separating the Symmetrize and Mirror operations under the Shape Keys panel.
Shape Key Mirror Plus is a Blender add-on from Ciyorie that mirrors and symmetrizes shape key deltas across symmetric axes. It works from a symmetric base shape, symmetrizing or mirroring shape key deformations rather than depending on Blender's built-in mirroring. The add-on is aimed at avoiding the errors commonly found in Blender's default shape key mirroring, especially on complex multi-part meshes.
Version 1.9.0 integrates the plugin panel under Shape Keys with an optimized layout, and keeps the Symmetrize and Mirror operations clearly separated. It's compatible with Blender 4.2 LTS and newer, and requires no special permissions to run.
Distributed under the GNU General Public License v3.0 or later, the add-on is a small package of around 17 KB. It installs by dragging and dropping into Blender or through Install from Disk. It's listed here as free; check the developer's page on Blender Extensions for the current license and version history.
Shape Key Mirror Plus is best for blender artists mirroring or symmetrizing shape keys on complex multi-part meshes.
Shape Key Mirror Plus is completely free to download and use.
Shape Key Mirror Plus lists compatibility with Blender 4.2 LTS and newer, so it runs on current long-term-support releases and later versions. If you're on an earlier build, you'd want to update Blender before installing. The current release is version 1.9.0, updated in May 2025. For the exact version behaviour on your setup, the developer's page on Blender Extensions carries the full version history and any notes tied to specific Blender releases.
Shape Key Mirror Plus installs by dragging and dropping the add-on into Blender, or by downloading it and using Install from Disk in Blender's preferences. The download is a small package, around 17 KB, so it adds little to your setup. After installation, the plugin panel appears under Shape Keys, where the Symmetrize and Mirror operations are kept clearly separated. The developer's page links to Blender's own extension installation documentation if you need step-by-step guidance.
Shape Key Mirror Plus is released under the GNU General Public License v3.0 or later, an open-source license. It's listed here as free, and requires no special permissions to run in Blender. Licensing terms can change over time, so the developer's page on Blender Extensions is the best place to confirm the current license and any conditions before you use it in a commercial project. That page also carries the add-on's full version history.
Shape Key Mirror Plus is designed to avoid the errors commonly found in Blender's default shape key mirroring, especially on complex multi-part meshes. It works by symmetrizing or mirroring shape key deformations based on a symmetric base shape, rather than relying on Blender's built-in behaviour. The add-on keeps its Symmetrize and Mirror operations clearly separated in a panel under Shape Keys. For the details of how each operation behaves on a given mesh, the developer's page on Blender Extensions is the reference.
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