Open source Substance Painter alternatives, compared

ArmorPaint is an open-source PBR texture-painting application distributed under the zlib licence. Source code is available, and compiled desktop builds are sold by the project. It lets an artist import a 3D model, paint colour, roughness, metallic and normal channels in layers, and export packed texture maps. Builds are listed for Windows, Linux and macOS, with platform support varying by release.

Its model is the closest match to Substance 3D Painter in this list: a 3D viewport, a layer stack, brushes, masks, materials and export presets. For indie game assets, props and stylised environments, it can carry a complete texture workflow without a subscription. The source licence also makes it possible to inspect and modify the application.

The break is ecosystem depth. ArmorPaint has a smaller library of smart materials, generators, brushes and export presets than Adobe’s product, and its community tutorials are thinner. GPU compatibility, performance on dense meshes and support for specific model formats should be tested on your hardware. It is a credible open source alternative, not a feature-for-feature clone.

Blender is a GPL-3.0-or-later 3D suite with texture painting, vertex painting, shader nodes, UV editing and Cycles baking. It runs on Windows, macOS and Linux. An artist can paint base colour directly on a model, build roughness and metallic behaviour in a shader, bake maps and export them for a game engine or renderer.

Its advantage is integration. Modelling, UV unwrapping, painting, baking and rendering happen in one application, so a small team can avoid moving assets between tools. Procedural node materials can generate detail that would be tedious to paint by hand, and the bake system can transfer high-poly detail to a low-poly mesh.

The boundary is the texture-painting experience. Blender does not provide Substance Painter’s layer-based material stack, smart masks and generator library, and its painting tools are less specialised for production texturing. Bake setup is manual, and performance on very dense meshes can be limited. Use Blender when integration and procedural control matter more than a dedicated painter’s interface.

Material Maker is an MIT-licensed procedural material authoring tool built with Godot. It uses a node graph to generate textures and PBR maps, and it can export those maps for engines and renderers. It runs on Windows, Linux and macOS and is aimed at artists who want reusable, parameter-driven materials.

Its strength is procedural reuse. A stone, metal or fabric material can be built once, exposed with parameters and reused across assets, with variations generated without repainting. That fits environment art, stylised projects and technical art workflows where consistency and iteration matter.

It is not a painting application. There is no 3D brush workflow, no layer stack on a model and no direct smart-material projection. The node graph has its own learning curve, and the output still has to be applied to a model in Blender or an engine. Use Material Maker for material generation and pair it with a painter when hand-authored detail is required.

Krita is a GPL-3.0 digital painting application for Windows, macOS and Linux. It is built for illustration, concept art and texture work, with brush engines, wrap-around mode for seamless tiles, layers, masks and colour management. Many game artists use it for 2D textures, trim sheets and hand-painted detail.

Its brush engine is stronger than most general-purpose editors for painterly work, and wrap-around mode makes seamless tiling practical. It handles large canvases and colour profiles well, and the interface is designed for long drawing sessions rather than photo correction or page layout.

It is not a PBR painter. Krita does not load a 3D model, paint across UV seams in a viewport, bake maps or pack roughness, metallic and ambient occlusion channels. A texture set must be authored as separate 2D images and assembled elsewhere. Use Krita for the painted content, then combine the channels in Blender or another PBR tool.

GIMP is a GPL-3.0-or-later raster editor for Windows, macOS and Linux. It provides layers, masks, channels, selections, colour management and a large filter and plug-in ecosystem. For texture work, it can edit individual maps, remove seams, adjust levels and assemble channel-packed images.

Its strength is general image manipulation rather than 3D painting. A technical artist can use GIMP to fix a normal map, combine an ambient-occlusion pass with a roughness map, or prepare a trim sheet. It is also widely available and well documented, which helps in a mixed team.

The boundary is the 3D workflow. GIMP does not load a model, project paint through UVs, bake high-poly detail or export a complete PBR set with channel packing presets. Seamless tiling and channel work are possible but manual. It remains useful for preparing maps that other tools will pack, but treat it as a supporting 2D tool, not as a Substance Painter replacement.

3D-Coat is a proprietary application for voxel sculpting, retopology and PBR texture painting, available for Windows, macOS and Linux. It combines a sculpting workspace with paint room, layers, smart materials and export options, and it is used in game and character pipelines where sculpting and texturing meet.

Its advantage is breadth. A user can block out a model, retopologise it, paint textures and bake maps in one application, which reduces round trips. The painting tools are mature, and the application has a long history in game development.

It is not open source. The licence is paid and proprietary, the code cannot be audited or self-hosted, and the interface and workflow differ from Substance Painter. It is a commercial product with its own learning curve. It belongs in a commercial shortlist, not an open-source one. For a strictly open source pipeline, start with ArmorPaint and use Blender for baking and integration.