ProPortion

ProPortion rescales cooking recipes. It works entirely offline: no account is needed, there is no synchronisation, and there is no data collection.

You enter a recipe with its quantities and the number of people it is meant for, then re-derive every quantity from a single constraint — a different number of servings, the amount you have of one ingredient, a multiplier, or the ingredients you actually have in the pantry. The value it adds over doing the maths by hand is culinary correctness: it knows that eggs cannot be halved, that "a pinch of salt" does not scale, and that a cake baked at 1.5x the recipe does not bake for 1.5x the time.

WHAT IT DOES

• Recipe entry and search — title, servings, tags by course, ingredients with typed units of measure, procedure steps. The recipe list filters by free text, tags and ingredients at the same time.

• Four ways to rescale — by servings, by an ingredient, by factor (×0.5, ×2, ×3, or any value), or by what is in the pantry: the app computes the limiting factor, flags the bottleneck ingredient, states how many servings you can actually make, and lists what is left over.

• Rounding warnings — if an ingredient is discrete (eggs, cloves, slices, sachets…) and rescaling would produce a non-whole number, the app flags it and proposes rounding it, recomputing the whole recipe accordingly.

• Oven advisory — for recipes baked in the oven, if the scaling factor falls outside the 0.7x–1.4x band the app warns that baking time and temperature do not scale proportionally, and suggests a new tin diameter at the same batter depth.

• Saved scalings — a rescaling can be saved as a labelled variant (e.g. "For 6") without ever changing the original recipe, and one variant can be set as the default.

• Sharing as plain text or as a .proportion file; opening a received .proportion file starts the import.

• Backup and restore of the whole library (recipes, tags, ingredient catalogue, variants), with a preview before writing and a choice between merging and replacing.

• Dashboard — library numbers, a breakdown of recipes by course, the last recipe you were cooking, the most-cooked and favourite recipes, and a random "what shall I cook?" suggestion.

• Shopping list — one persistent list; quantities of the same ingredient are merged when units are compatible and kept as separate lines otherwise, each remembering which recipe it came from.

• Cooking mode — keeps the screen on, enlarges the text, shows checkable steps, and keeps scaled quantities one tap away.

• Convert between weight, volume and count — including imperial units (oz, lb, fl oz, pint, quart, gallon) — via each ingredient's density or per-item weight, asked once and remembered from then on.

• Favourites, with a counter of how many times a recipe has been cooked.

• Italian and English, chosen independently of the device's own language, or left to follow the system.

• Appearance — colours from your wallpaper (Material You, Android 12+), or four built-in themes (Pastel, Vivid, Playful, High contrast), each with light and dark variants.

WHAT IT DOES NOT DO (yet)

No accounts, no cloud sync, no recipe photos.