Free Forever

Stull Atlas is free.

Every tool, every glaze, every oxide chart — no subscription, no trial, no catch. Sign in to save your work.

Thousands of recipes with UMF, cone, atmosphere, and surface data.

Interactive 2D + 3D Stull diagram. Filter, color-code, and compare.

Full unity molecular formula analysis with limit overlays and fired-color preview.

Line blends, triaxials, biaxials, and quadaxials mapped on the Stull chart.

Set target UMF targets and let the solver find a recipe that hits them.

960+ ceramic materials with analysis, suppliers, and substitution data.

Cloud-synced personal recipe library with notes, tags, and test results.

Ceramics programs get bulk access codes for students and faculty.

Why is it free?: Stull Atlas exists to make glaze chemistry more accessible. Putting it behind a paywall defeats that.
Do I need an account?: No. The explorer, calculator, and materials database work without signing in. Create an account to save recipes and sync across devices.
What about institutional access?: Ceramics programs can get access codes for students. Email to request codes for your program.
Is my data safe?: Recipe libraries are stored in Supabase with row-level security. Your recipes are private to your account.

Questions