In 3D model generation, Sloyd ranks #4 and Retro Diffusion ranks #5. No independent quality tests found. Ranked on game-dev fit: commercial use on paid plans; Godot, Unity, Unreal integrations; API.
Commercial use: Retro Diffusion: commercial use allowed terms. Sloyd: commercial on paid plans only terms.
Free plan: Retro Diffusion: free trial or credits only (Free starting balance for new accounts) pricing. Sloyd: free plan (Free Guest plan; personal use only) pricing.
Shipping free-plan output in a paid game: only Retro Diffusion allows it, per their published terms.
API and MCP: Retro Diffusion: public API, official MCP server. Sloyd: public API, no MCP server found.
Engine integrations stated by the vendor: Retro Diffusion: Godot, Unity, Unreal. Sloyd: Godot, Unity, Unreal, Blender, Roblox.
Pixel-art-specific image models for sprites, tiles, tilesets and animations, plus low-poly 3D model generation with export for Godot, Unity and Unreal. Also sells an Aseprite extension.
Template-based and AI 3D generator for game-ready props and objects, with browser editor and plugins for Unity, Unreal and Blender on paid plans.
Verdict
For pixel-art devs who want pay-per-image pricing with no subscription; the site says all output is yours for commercial use.
For game-ready props from editable templates with Unity/Unreal plugins; the free plan is personal-use only.
Tasks●
Concept art & 2D assets, 3D model generation
3D model generation
Engines●
Godot, Unity, Unreal
Godot, Unity, Unreal, Blender, Roblox
Free plan●
Free trial or credits only Free starting balance for new accounts
Free plan Free Guest plan; personal use only
Pricing
Pay per generation from a prepaid balance: images from US$0.03 (RD Fast), US$0.06, US$0.18 (RD Pro); animations from US$0.07 per clip. New accounts get a free starting balance. source
Free Guest plan. Plus US$15/month (US$12.50/month billed yearly). Pro US$50/month (US$41.67/month billed yearly). source
Commercial use allowed Official FAQ: "Everything you generate is yours, for personal and commercial projects alike." source
Commercial on paid plans only Free plan: personal-use license. Plus and Pro include a commercial license (you own what you generate; Pro adds reselling). source
Rows marked ● differ between the two tools. Licence badges: green = commercial use allowed (including any free plan or trial), amber = paid plans only, restricted, or allowed but with no free plan, red = not allowed, grey = not stated by vendor or not applicable. Read the vendor's current terms before you ship.
