CastleJello is a Blender automation engine. It wraps Blender's Python API in 441 handlers that can be called from scripts and tools, which means you can build entire scenes by describing them in code instead of clicking through menus. The engine ships with 56 parametric object types, 27 UV and texture tools, a full VSE compositor pipeline, and a health scoring system that checks your scene for floating objects and missing materials.
The source code lives on Codeberg. It targets Blender 5.2 LTS, which is supported until July 2028.
Everything sold on this site was built inside CastleJello. The NPR Shader Pack uses the engine's shader tools. The parametric furniture and room collections use its object builders and room composer. Buying a product here also means buying proof that the engine works, and if you ever want to build your own version of something you bought, the tools are available.
One developer. A Blender user who got tired of platforms that charge annual fees for version updates and decided to build a different kind of storefront. If you email with a question, you'll get a reply from the person who wrote the code and assembled the products.
Payments are handled through Lemon Squeezy for cards and BTCPay for bitcoin. We don't store your payment details and we don't require you to make an account to buy anything.
A lot of Blender marketplaces have moved toward annual support fees and version re-purchases. We think that model makes sense for the platform but not for the buyer. You already paid for the product. Making you pay again when Blender updates feels like a toll, not a service.
The file you download today will work with every subsequent Blender version that the engine targets. If a breaking change happens, you'll get an updated file in your email. It doesn't cost extra and it never will.