by Zakmen150·Workflow
Images © Zakmen150. Used for product review; image policy.
Earns its place in the blender_extensions library by turning driver setup into a fill-in-the-fields step, letting the add-on write the normalized, eased expression for you to paste into Blender.
DriverHelper generates normalized driver expressions for Shape Keys and other float properties in Blender. Add a driver as usual, then use the DriverHelper UI in the Shape Keys panel: choose a Driver Mode of Location, Rotation, or Scale, set the Min and Max values for your input range, and adjust the Power parameter. The Min and Max values map to 0 and 1.
The Power parameter controls the curve of the transition and supports custom easing such as linear, ease-in, and ease-out. Click Generate Formula and a popup displays the generated expression, which you copy and paste into Blender's driver expression field.
For Rotation mode, enter angles in degrees and the add-on converts them to radians. The var in the formula refers to your driver variable, such as a bone's rotation. It works for any float property that supports drivers, not just Shape Keys. DriverHelper is compatible with Blender 4.2 LTS and newer and released under the GNU General Public License v3.0 or later.
DriverHelper is best for blender users setting up driver-based Shape Keys and other float-property drivers who want normalized expressions with easing.
DriverHelper is completely free to download and use.
DriverHelper is compatible with Blender 4.2 LTS and newer, so recent Blender releases are supported. Version 1.0.1, updated in August 2025, refactored the add-on to use a PropertyGroup for its properties and removed the platforms field to indicate support for all platforms. If you're on an older Blender build, check the developer's page on blender.org before installing to confirm your version falls within the supported range.
DriverHelper works from the Shape Keys panel. Add a driver to your Shape Key or float property as usual, then open the DriverHelper UI, choose a Driver Mode of Location, Rotation, or Scale, and set the Min and Max values of your input range, which map to 0 and 1. Adjust the Power parameter for easing, then click Generate Formula. A popup shows the generated expression, which you copy and paste into Blender's driver expression field.
DriverHelper is not limited to Shape Keys. The generated formula works for any float property that supports drivers, so you can drive other animatable values with the same normalized expression. The var in the formula refers to your driver variable, such as a bone's rotation. For Rotation mode, you enter angles in degrees and the add-on converts them to radians before building the expression you paste into Blender.
DriverHelper is listed as free here and released under the GNU General Public License v3.0 or later. That license covers how you can use, modify, and redistribute the add-on. For the current terms and any licensing details, check the developer's page on blender.org. The add-on also states it does not require special permissions, so installation follows Blender's standard extension process without extra access requests.
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