Building a fitness app
The APIs you would realistically stitch together, grouped by role: core data first, then enrichment, images and location.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
AirNowHourly AQI observations and daily air quality forecasts for the US, Canada and Mexico by zip or coordinate. Weather & Environment › Air Quality | Free | API key | JSON | — | Live |
APIXUDiscontinued weather API; apixu.com now server-redirects permanently to Weatherstack. Weather & Environment › Forecasts | — | Deprecated | |||
AQICN (World Air Quality Index)Real-time air quality index, pollutant levels, and forecasts from 11,000+ global monitoring stations. Weather & Environment › Air Quality | Free | API key | JSON | 10k+/day | Live |
balldontlieScores, box scores, standings, and player stats across NBA, NFL, MLB, soccer, and more. Sports › Stats | Freemium | API key | JSON | 1k–10k/day | Live |
CalorieNinjasNutrition facts for foods and meals parsed from a natural-language food query. Food & Drink › Nutrition | Freemium | API key | JSON | 100–1k/day | Deprecated |
ChompBarcode, name and ingredient lookups for 1.2M+ branded groceries with nutrition and allergen data. Food & Drink › Nutrition | Freemium | API key | JSON | — | Live |
City BikesReal-time bike-share station and availability data for 400+ cities worldwide. Transport & Travel › Transit | Free | None | JSON | Unlimited | Live |
ColorfulClouds Weather APIGlobal weather forecasts with minute-by-minute nowcasting and air-quality data by coordinates. Weather & Environment › Forecasts | Freemium | API key | JSON | — | Degraded |
DietlyAPIFood and nutrition lookup with calories, macros and barcode search from Open Food Facts and USDA. Food & Drink › Nutrition | Freemium | None | JSON | 10k+/day | Live |
Edamam Food DatabaseParses free-text or barcode food searches into matched foods with nutrient and allergen data. Food & Drink › Nutrition | Paid | API key | JSON | — | Live |
Edamam Nutrition AnalysisTurns plain-text ingredient lines or full recipes into calories, nutrients, and diet and allergy labels. Food & Drink › Nutrition | Paid | API key | JSON | — | Live |
FindSaunaPlungeUS cold plunge and sauna studio directory with prices, temperatures, and verification dates. Location & Mapping › Places | Free | None | JSON | Unlimited | Live |
Food InfoHarmonized nutrition data for millions of foods merged from five national databases plus Open Food Facts. Food & Drink › Nutrition | Freemium | API key | JSON | 100–1k/day | Live |
FoodData CentralUSDA nutrient data for foundation, branded and survey foods, with full nutrient breakdowns. Food & Drink › Nutrition | Free | API key | JSON | 10k+/day | Live |
Foreca Weather APIGlobal point weather forecasts plus air quality, pollen, marine and ski-resort conditions. Weather & Environment › Forecasts | Freemium | API key | JSON | 1k–10k/day | Untested |
GraphHopper Directions APITurn-by-turn routing and route optimization for driving, cycling and walking, worldwide. Location & Mapping › Routing | Freemium | API key | JSON | 100–1k/day | Live |
Hong Kong Observatory Open DataReal-time Hong Kong weather, warnings, forecasts, climate records and worldwide M6+ earthquake data. Weather & Environment › Forecasts | Free | None | JSON | Unlimited | Live |
ipfind.ioLooks up country, city, timezone, currency and languages for an IP address. Location & Mapping › IP Geolocation | Freemium | API key | JSON | 100–1k/day | Live |
IPLocateIP geolocation plus ASN, hosting, company and privacy/threat data (VPN, proxy, Tor detection) for any IP. Location & Mapping › IP Geolocation | Freemium | API key | JSON | 1k–10k/day | Live |
ipwhoisIP-to-location lookup with country, city, timezone, currency, ISP and optional proxy/VPN detection. Location & Mapping › IP Geolocation | Freemium | None | JSON | 1k–10k/day | Live |
IQAir AirVisualCurrent US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings Weather & Environment › Air Quality | Freemium | API key | JSON | 100–1k/day | Live |
Longevity World CupBiological-age competition data: athlete biomarkers, rankings and PhenoAge/Bortz aging-clock results. Health & Science › Biology | None | JSON | Unlimited | Live | |
LuchtmeetnetReal-time and forecast air quality measurements from Dutch government monitoring stations. Weather & Environment › Air Quality | Free | None | JSON | 10k+/day | Live |
MET Norway LocationforecastNine-day point forecasts for any latitude/longitude with weather symbol codes and UV, richest for the Nordics Weather & Environment › Forecasts | Free | None | JSON | 10k+/day | Live |
MeteoblueSwiss forecast, historical and dataset weather API with credit-metered packages for many variables. Weather & Environment › Forecasts | Freemium | API key | JSON | — | Live |
Meteorologisk InstituttNorway's national weather service: global forecasts plus Nordic marine, aviation and nowcast data. Weather & Environment › Forecasts | Free | None | JSON | Unlimited | Live |
MeteosourceGlobal current, hourly and 30-day forecasts blending weather models with AI, plus air quality data. Weather & Environment › Forecasts | Freemium | API key | JSON | 100–1k/day | Live |
MoonloraMoon phase, illumination, moon sign, and moonrise/moonset data for 1900–2100. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
National Weather ServiceOfficial US forecasts on a 2.5 km grid, active watches and warnings, and station observations, as GeoJSON. Weather & Environment › Forecasts | Free | None | JSON | Unlimited | Live |
Open Food FactsCrowd-sourced packaged-food data by barcode: ingredients, nutrition facts, allergens, Nutri-Score and photos. Food & Drink › Nutrition | Free | None | JSON | 10k+/day | Live |
Open-MeteoHourly and daily forecasts up to 16 days built from national weather-service models, callable without a key. Weather & Environment › Forecasts | Freemium | None | JSON | 10k+/day | Live |
OpenUVReal-time and hourly UV index forecasts by latitude/longitude, with altitude and ozone adjustments. Weather & Environment › Forecasts | API key | JSON | — | Live | |
OpenWeatherCurrent conditions, 5-day forecasts, air pollution and map layers for any coordinates, plus geocoding. Weather & Environment › Forecasts | Freemium | API key | JSON | 10k+/day | Live |
OSRMRoad, bike and foot routing on OpenStreetMap: routes, distance matrices, GPS map matching, trip optimisation. Location & Mapping › Routing | Free | None | JSON | 10k+/day | Live |
Padel SnipeLocations, courts, and booking platform for 5,000+ padel clubs worldwide, updated daily. Sports › Stats | Free | None | JSON | Unlimited | Live |
PixelaRecords daily habit/effort quantities per user and renders them as GitHub-style contribution graphs. Health & Science › Fitness | Freemium | API key | JSON | — | Live |
QWeatherGlobal real-time weather, forecasts, air quality, and severe alerts at 1km resolution. Weather & Environment › Forecasts | Freemium | API key | JSON | 1k–10k/day | Down |
Rainbow WeatherMinute-by-minute precipitation nowcasting, cloud/precip map tiles, and hourly/daily forecasts. Weather & Environment › Forecasts | Freemium | API key | JSON | 100–1k/day | Live |
SpoonacularRecipe search by ingredient, diet or nutrients, plus nutrition facts, grocery products and meal planning. Food & Drink › Recipes | Freemium | API key | JSON | — | Live |
Storm GlassMarine and weather forecasts (waves, tides, wind, temperature) blended from multiple national models. Weather & Environment › Forecasts | Freemium | API key | JSON | <100/day | Live |
Tallytopia73 deterministic calculators (finance, health, math, space, sports) as JSON, with step-by-step working. Utilities › Math | Free | None | JSON | 10k+/day | Live |
Tomorrow.ioRealtime conditions plus hourly (120h) and 5-day forecasts from proprietary models, with 60+ data layers. Weather & Environment › Forecasts | Freemium | API key | JSON | — | Live |
US WeatherUS government forecasts, alerts and observations by grid point, in GeoJSON with multiple format options. Weather & Environment › Forecasts | Free | None | JSON | Unlimited | Live |
wgerOpen exercise database, workout routines and nutrition/ingredient data from the wger project. Health & Science › Fitness | None | JSON | Unlimited | Live | |
Yandex Weather APIGlobal current conditions, hourly/10-day forecasts and history via Yandex's Meteum GraphQL API. Weather & Environment › Forecasts | Free trial | API key | JSON | — | Live |
Your Move - Exercise APIExercise library with 1,400+ HD videos, muscle/equipment data, and AI workout/program generation. Health & Science › Fitness | Free trial | API key | JSON | <100/day | Live |
Your Move - Nutrition APIFood and nutrition search, barcode lookup, and meal-plan generation across 180+ countries. Food & Drink › Nutrition | Free trial | API key | JSON | — | Live |
AirNowFreeLive
Hourly AQI observations and daily air quality forecasts for the US, Canada and Mexico by zip or coordinate.
API key · JSON
—
no machine-readable spec
APIXUDeprecated
Discontinued weather API; apixu.com now server-redirects permanently to Weatherstack.
·
—
no machine-readable spec
AQICN (World Air Quality Index)FreeLive
Real-time air quality index, pollutant levels, and forecasts from 11,000+ global monitoring stations.
API key · JSON
10k+/day
no machine-readable spec
balldontlieFreemiumLive
Scores, box scores, standings, and player stats across NBA, NFL, MLB, soccer, and more.
API key · JSON
1k–10k/day
OpenAPI spec · MCP server
CalorieNinjasFreemiumDeprecated
Nutrition facts for foods and meals parsed from a natural-language food query.
API key · JSON
100–1k/day
OpenAPI spec
ChompFreemiumLive
Barcode, name and ingredient lookups for 1.2M+ branded groceries with nutrition and allergen data.
API key · JSON
—
OpenAPI spec
City BikesFreeLive
Real-time bike-share station and availability data for 400+ cities worldwide.
None · JSON
Unlimited
no machine-readable spec
ColorfulClouds Weather APIFreemiumDegraded
Global weather forecasts with minute-by-minute nowcasting and air-quality data by coordinates.
API key · JSON
—
no machine-readable spec
DietlyAPIFreemiumLive
Food and nutrition lookup with calories, macros and barcode search from Open Food Facts and USDA.
None · JSON
10k+/day
llms.txt
Edamam Food DatabasePaidLive
Parses free-text or barcode food searches into matched foods with nutrient and allergen data.
API key · JSON
—
OpenAPI spec
Edamam Nutrition AnalysisPaidLive
Turns plain-text ingredient lines or full recipes into calories, nutrients, and diet and allergy labels.
API key · JSON
—
OpenAPI spec
FindSaunaPlungeFreeLive
US cold plunge and sauna studio directory with prices, temperatures, and verification dates.
None · JSON
Unlimited
MCP server · llms.txt
Food InfoFreemiumLive
Harmonized nutrition data for millions of foods merged from five national databases plus Open Food Facts.
API key · JSON
100–1k/day
OpenAPI spec · llms.txt
FoodData CentralFreeLive
USDA nutrient data for foundation, branded and survey foods, with full nutrient breakdowns.
API key · JSON
10k+/day
no machine-readable spec
Foreca Weather APIFreemiumUntested
Global point weather forecasts plus air quality, pollen, marine and ski-resort conditions.
API key · JSON
1k–10k/day
llms.txt
GraphHopper Directions APIFreemiumLive
Turn-by-turn routing and route optimization for driving, cycling and walking, worldwide.
API key · JSON
100–1k/day
OpenAPI spec · llms.txt
Hong Kong Observatory Open DataFreeLive
Real-time Hong Kong weather, warnings, forecasts, climate records and worldwide M6+ earthquake data.
None · JSON
Unlimited
no machine-readable spec
ipfind.ioFreemiumLive
Looks up country, city, timezone, currency and languages for an IP address.
API key · JSON
100–1k/day
no machine-readable spec
IPLocateFreemiumLive
IP geolocation plus ASN, hosting, company and privacy/threat data (VPN, proxy, Tor detection) for any IP.
API key · JSON
1k–10k/day
llms.txt
ipwhoisFreemiumLive
IP-to-location lookup with country, city, timezone, currency, ISP and optional proxy/VPN detection.
None · JSON
1k–10k/day
no machine-readable spec
IQAir AirVisualFreemiumLive
Current US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings
API key · JSON
100–1k/day
no machine-readable spec
Longevity World CupLive
Biological-age competition data: athlete biomarkers, rankings and PhenoAge/Bortz aging-clock results.
None · JSON
Unlimited
OpenAPI spec · llms.txt
LuchtmeetnetFreeLive
Real-time and forecast air quality measurements from Dutch government monitoring stations.
None · JSON
10k+/day
no machine-readable spec
MET Norway LocationforecastFreeLive
Nine-day point forecasts for any latitude/longitude with weather symbol codes and UV, richest for the Nordics
None · JSON
10k+/day
OpenAPI spec
MeteoblueFreemiumLive
Swiss forecast, historical and dataset weather API with credit-metered packages for many variables.
API key · JSON
—
OpenAPI spec
Meteorologisk InstituttFreeLive
Norway's national weather service: global forecasts plus Nordic marine, aviation and nowcast data.
None · JSON
Unlimited
no machine-readable spec
MeteosourceFreemiumLive
Global current, hourly and 30-day forecasts blending weather models with AI, plus air quality data.
API key · JSON
100–1k/day
OpenAPI spec
MoonloraFreeLive
Moon phase, illumination, moon sign, and moonrise/moonset data for 1900–2100.
None · JSON
Unlimited
OpenAPI spec · MCP server · llms.txt
National Weather ServiceFreeLive
Official US forecasts on a 2.5 km grid, active watches and warnings, and station observations, as GeoJSON.
None · JSON
Unlimited
OpenAPI spec
Open Food FactsFreeLive
Crowd-sourced packaged-food data by barcode: ingredients, nutrition facts, allergens, Nutri-Score and photos.
None · JSON
10k+/day
no machine-readable spec
Open-MeteoFreemiumLive
Hourly and daily forecasts up to 16 days built from national weather-service models, callable without a key.
None · JSON
10k+/day
no machine-readable spec
OpenUVLive
Real-time and hourly UV index forecasts by latitude/longitude, with altitude and ozone adjustments.
API key · JSON
—
OpenAPI spec
OpenWeatherFreemiumLive
Current conditions, 5-day forecasts, air pollution and map layers for any coordinates, plus geocoding.
API key · JSON
10k+/day
MCP server · llms.txt
OSRMFreeLive
Road, bike and foot routing on OpenStreetMap: routes, distance matrices, GPS map matching, trip optimisation.
None · JSON
10k+/day
no machine-readable spec
Padel SnipeFreeLive
Locations, courts, and booking platform for 5,000+ padel clubs worldwide, updated daily.
None · JSON
Unlimited
llms.txt
PixelaFreemiumLive
Records daily habit/effort quantities per user and renders them as GitHub-style contribution graphs.
API key · JSON
—
no machine-readable spec
QWeatherFreemiumDown
Global real-time weather, forecasts, air quality, and severe alerts at 1km resolution.
API key · JSON
1k–10k/day
no machine-readable spec
Rainbow WeatherFreemiumLive
Minute-by-minute precipitation nowcasting, cloud/precip map tiles, and hourly/daily forecasts.
API key · JSON
100–1k/day
no machine-readable spec
SpoonacularFreemiumLive
Recipe search by ingredient, diet or nutrients, plus nutrition facts, grocery products and meal planning.
API key · JSON
—
OpenAPI spec
Storm GlassFreemiumLive
Marine and weather forecasts (waves, tides, wind, temperature) blended from multiple national models.
API key · JSON
<100/day
OpenAPI spec
TallytopiaFreeLive
73 deterministic calculators (finance, health, math, space, sports) as JSON, with step-by-step working.
None · JSON
10k+/day
OpenAPI spec
Tomorrow.ioFreemiumLive
Realtime conditions plus hourly (120h) and 5-day forecasts from proprietary models, with 60+ data layers.
API key · JSON
—
llms.txt
US WeatherFreeLive
US government forecasts, alerts and observations by grid point, in GeoJSON with multiple format options.
None · JSON
Unlimited
no machine-readable spec
wgerLive
Open exercise database, workout routines and nutrition/ingredient data from the wger project.
None · JSON
Unlimited
no machine-readable spec
Yandex Weather APIFree trialLive
Global current conditions, hourly/10-day forecasts and history via Yandex's Meteum GraphQL API.
API key · JSON
—
no machine-readable spec
Your Move - Exercise APIFree trialLive
Exercise library with 1,400+ HD videos, muscle/equipment data, and AI workout/program generation.
API key · JSON
<100/day
OpenAPI spec · llms.txt
Your Move - Nutrition APIFree trialLive
Food and nutrition search, barcode lookup, and meal-plan generation across 180+ countries.
API key · JSON
—
OpenAPI spec · llms.txt
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