Building a fitness app

A working stack, not a category dump: core data, enrichment, location. Every listing below carries its own spec sheet.

6 APIs across 3 roles

01

Core data

Food and nutrition logging

Open Food FactsFree

Crowd-sourced packaged-food data by barcode: ingredients, nutrition facts, allergens, Nutri-Score and photos.

Edamam Nutrition AnalysisPaid

Turns plain-text ingredient lines or full recipes into calories, nutrients, and diet and allergy labels.

API key · JSON

SpoonacularFreemium

Recipe search by ingredient, diet or nutrients, plus nutrition facts, grocery products and meal planning.

API key · JSON

02

Enrichment

Whether it is a day to train outside

Open-MeteoFreemium

Hourly and daily forecasts up to 16 days built from national weather-service models, callable without a key.

IQAir AirVisualFreemium

Current US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings

API key · JSON

03

Location

Route and distance for the run

Road, bike and foot routing on OpenStreetMap: routes, distance matrices, GPS map matching, trip optimisation.

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