Ingredient Substitutions

Substitution charts, IsItVegan, Spoonacular substitution API, allergen-driven swaps.

The "I don't have buttermilk, what do I use?" page. For broader recipe import / data see Recipe Import & Scrapers; for allergen-driven swaps see Allergen & Intolerance Tracking; for diet-specific swap suites (vegan, keto, GF) see Diet-Specific Apps; for the food-data layer see Food Databases & Open Food Facts.

Reference charts (free, the right starting place)

★ King Arthur Baking ingredient substitution chart — free; baking-flavored; reliable; the right call for flour / leavening / dairy swaps.
- https://www.kingarthurbaking.com/learn/ingredient-substitutions
★ Cook's Illustrated substitution table (paid) — vetted by ATK; high-trust.
Bon Appétit "How to substitute" — free; magazine-style; uneven.
The Spruce Eats / Allrecipes — free; ad-stuffed; uneven.
Joy of Cooking appendix — book; thorough.
The Flavor Bible (Karen Page) — book; pairings + swaps; lookup-style.

Spoonacular substitution API — paid + small free tier; programmatic; "ingredient X → swap, ratio, note." Useful if you're building. See Recipe Import & Scrapers.
Substitutions.io / Substitution Cookbook — niche; varying quality.
Yummly substitution feature — sunset with Yummly itself; ignore.
Kitchen Stories app — free + paid; built-in substitution suggestions; clean.
Tandoor recipes — has manual substitution support; you maintain the rules.

Find Me Gluten Free — paid + free; restaurants, not ingredients; useful adjacent.
AllergyEats — same shape.
Open Food Facts allergens — for branded products. See Food Databases & Open Food Facts.
King Arthur "Gluten-free baking" guide — free; the right reference.
Cup4Cup, King Arthur GF flour — pre-blended GF flours that 1:1 sub for AP flour in many baking applications.

IsItVegan — paid + free; barcode-scan; flags non-vegan ingredients; consumer-flavored.
HappyCow — paid + free; restaurant-finder, not substitutions. See Diet-Specific Apps.
Veganuary swap guide — free; January-flavored campaign.
Forks Over Knives swap guide — free; whole-food-plant-based.

★ Ask Claude / GPT for swaps with constraints: "I'm out of buttermilk and have whole milk + lemon juice; give me a 1-cup substitute and explain the reasoning." Modern LLMs are reliably good at this; faster than a chart for the contextual questions a chart can't anticipate.
The 2026 reality: a good LLM beats most substitution apps for non-trivial cases. Charts still win for "1:1, no thinking required" lookups.

Buttermilk → 1 cup milk + 1 tbsp lemon juice / vinegar; let sit 5 min.
Eggs (baking) → flax / chia "egg" (1 tbsp + 3 tbsp water, gel 5 min); aquafaba (3 tbsp = 1 egg); commercial egg replacer.
Butter (baking) → coconut oil (1:1, may flavor); olive oil (3/4:1, savory only); vegan butter (1:1).
Flour (1 cup AP) → 1 cup GF blend; 7/8 cup whole wheat; 1 cup bread flour (slightly chewier).
Sugar → honey / maple (3/4:1, reduce liquid); coconut sugar (1:1); allulose (1:1, doesn't brown).
Wine in cooking → broth + 1 tbsp vinegar per cup; verjus.
Soy sauce → coconut aminos (1:1, milder); tamari (GF).
Heavy cream → 3/4 cup milk + 1/4 cup butter; coconut cream (1:1, dairy-free).
Yeast (instant ↔ active) → instant is ~25% stronger; bloom active in warm water.

★ Baking is chemistry; substituting changes outcomes. Cookies, breads, cakes — substitutions affect texture and rise. Charts are starting points, not guarantees.
Cooking is forgiving; substitute freely. Soups, stews, sautés — most swaps just shift flavor.
Match function, not just ingredient. Buttermilk in a recipe is acid + fat + protein. The "cup of milk + lemon juice" trick covers acid + fat; for full function use yogurt or sour cream thinned with milk.
Test once before scaling. The first time you swap, halve the recipe.
For commercial / labeling concerns, document. "Made with substitution" should appear on any product you sell with non-original ingredients.