by ugulay·Modeling
Images © ugulay. Used for product review; image policy.
Hardflow earns its place in the blender_extensions library by covering the whole hard-surface loop — booleans, direct modeling, curves, decals, and kitbash — in one GPLv3 add-on. Its pure-logic core is unit-tested at 144 of 144, and its bpy paths are verified headless in Blender 5.1.2, while the modal tools' interactive feel goes through a manual checklist.
Hardflow packages a full hard-surface workflow into a single Blender add-on from developer ugulay. Its boolean side offers draw-to-cut shapes — Box, Circle, Polygon, N-gon, Slot, Star, Arc, and Vent — with Cut, Slice, Make, Join, Intersect, Face, and Knife modes usable in Object and Edit Mode. While drawing, you can add inset, array, mirror, bevel-on-cut, in-plane rotation, and stamp/repeat, and see a live boolean preview before committing. Panel-line tools turn selected edges into recessed groove seams or raised weld beads in one click.
Beyond booleans, it includes direct modeling with primitives, Push/Pull, Offset, Edge Bevel, Loop Cut, guides, and loft/bridge, plus a Super Modeling Mode with Ghost-Grid snapping and a per-tool undo journal. Smart Bevel drops support loops so edges survive Subdivision. Freehand curve drawing strokes pipe, cable, and sweep paths that hug the surface, with cable gravity settle for draping over geometry.
A decal pipeline, trim-sheet UV editor, heightmap decals, and kitbash INSERTs round out the toolkit. Hardflow is licensed under GPLv3 and listed here as free.
Hardflow is best for hard-surface modelers in Blender who want draw-to-cut booleans, panel lines, decals, and kitbash inserts in a single add-on.
Hardflow is completely free to download and use.
Hardflow is built for Blender 4.2 LTS and newer, so it runs on 4.2 and later releases. Its pure-logic core is unit-tested at 144 of 144, and every bpy path is verified headless in Blender 5.1.2 across 142 tests, while the modal tools' interactive feel goes through a manual checklist. If you run an older Blender release, you would need to update to 4.2 or higher before installing. For the current build and any compatibility notes, check the developer's GitHub page.
Hardflow is listed here as free and is distributed as open source under the GNU General Public License v3.0 or later. The developer states it is and stays free, with an architecture built so features remain isolated, which is why feedback and contributions are welcomed. Because licensing terms can change, it's worth confirming the current details on the developer's GitHub page before you rely on it in a project. The extension does not require any special permissions.
Hardflow is available from its GitHub repository at github.com/ugulay/hardflow, where the developer provides the repo and install details. It's a Blender extension for 4.2 LTS and newer, and it does not require any special permissions to run. For the exact step-by-step setup, follow the instructions on the developer's page to add it to your Blender install. The current version is 1.21.0, published in July 2026, so grab the latest release from the repository to stay up to date.
Hardflow supports a non-destructive mode: instead of applying a boolean, it leaves a live modifier and keeps cutters in a separate collection, managed through a modifier-stack manager that you can bake when ready. Its panel-line tools can also work either destructively or as live cutters. The same draw-to-cut shapes and in-draw operations remain available whether you work destructively or non-destructively, so you can keep edits adjustable and commit the result once you're satisfied.
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