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Categories
🎨 Color APIs
Color utilities for design tools, accessibility checkers, and palette generators.
LOD DevTools Color API
Convert between HEX, RGB, HSL, CMYK, HSV; generate complementary palettes; check WCAG contrast ratios. Unlimited free tier, no key needed.
COLOURlovers API
Millions of user-created color palettes, patterns, and community trends.
The Color API
Identify colors from hex codes, get color names, find complementary and triadic schemes.
Color Hunt API
Curated color palette collection — trending palettes, popular schemes, random suggestions.
₿ Cryptocurrency APIs
LOD DevTools Crypto API
Real-time crypto prices, market data, conversion rates for 100+ coins from multiple sources.
CoinGecko API
Free tier: 10-30 calls/min. Price data, market cap, volume, and history for 10,000+ cryptocurrencies.
CoinMarketCap API
Professional-grade crypto data. Free tier: 333 calls/day with latest quotes and listings.
Binance API
Real-time order book data, trading pairs, and price streams. Free with API key.
Messari API
On-chain metrics, real-time and historical prices, project fundamentals.
🌍 Geolocation & Mapping APIs
LOD DevTools Geo API
IP geolocation, timezone lookup, country data, currency info — all in one unified endpoint.
OpenWeatherMap Geocoding
Direct and reverse geocoding. Free tier: 1,000 calls/day.
ip-api.com
Free IP geolocation — no API key required. 45 requests/minute from one IP.
OpenCage Geocoding API
Forward and reverse geocoding from multiple sources. Free tier: 2,500 calls/day.
Mapbox API
Custom maps, geocoding, directions. Free tier: 50,000 map loads/month.
REST Countries
Country data: names, capitals, currencies, languages, flags, and more. Completely free.
⛅ Weather APIs
LOD DevTools Weather API
Current weather, forecasts, and historical data for any location. Powered by OpenWeatherMap.
OpenWeatherMap API
Gold standard. Free tier: 60 calls/min, 1,000 calls/day. Current, forecast, and historical.
WeatherAPI.com
Free tier: 1M calls/month. Current weather, forecasts, astronomy, time zone, and sports data.
NWS Weather API
US National Weather Service — free, no key required. US-only but highly accurate.
Meteosource Weather API
Hyper-local weather forecasts. Free tier: 400 calls/day.
🤖 NLP & Text Processing APIs
LOD DevTools Text API
Text analysis, word counting, sentiment scoring, readability metrics, and more.
OpenAI API
GPT-4o Mini: $0.15/$0.60 per MTok. $5 free credits for new users.
Google Gemini API
Gemini 2.5 Flash free tier: 15 requests/min. Free text generation and analysis.
Hugging Face Inference API
Free inference for 100,000+ open models. Classification, summarization, translation.
MeaningCloud API
Sentiment analysis, categorization, summarization, language detection. 20K calls/month free.
🖼️ Image Processing APIs
Lorem Picsum
The internet's favorite placeholder image service. Free, no key required.
Cloudinary Upload API
Image upload, transformation, optimization. 25GB storage + 25GB bandwidth/month free.
TinyPNG API
PNG and JPEG compression. Free tier: 500 compressions/month.
Cloudflare Images
Image resizing, optimization, and CDN delivery. Generous free allowances.
💰 Finance & Stock Market APIs
LOD DevTools Finance API
Currency conversion, stock prices, and market data aggregated from multiple sources.
Alpha Vantage API
Stock prices, forex, crypto, technical indicators. Free tier: 25 calls/day.
Twelve Data API
Real-time and historical stock, forex, crypto data. Free tier: 800 calls/day.
Finnhub API
Real-time stock data, fundamentals, economic data. Free tier: 60 calls/min.
ExchangeRate.host
Free currency conversion, no key needed. 170 currencies supported.
⚙️ DevOps & Infrastructure APIs
LOD DevTools DevOps API
Uptime checking, SSL validation, DNS lookup, domain WHOIS queries — one endpoint.
UptimeRobot API
Create, manage, query uptime monitors. Free tier: 50 monitors at 5-min intervals.
GitHub REST API
Repos, issues, PRs, actions, and more. 5,000 requests/hour authenticated.
Cloudflare API
DNS management, DDoS protection, CDN configuration. Generous free operations.
Shodan API
Search engine for internet-connected devices. Limited free tier.
📊 Data & Reference APIs
LOD DevTools Reference API
Dictionary definitions, thesaurus, trivia, facts, UUID generation, and random data.
Free Dictionary API
Word definitions, phonetics, synonyms, translations. Free, no key needed.
Open Library API
Millions of book records — search, read, contribute. Completely free.
TMDB API
Movie and TV show database. Generous free tier for non-commercial use.
NewsAPI
Search global news from 150,000+ sources. Free tier: 100 requests/day.
Random User Generator
Generate realistic fake user data for testing. Free, no key needed.
NASA API
APOD, Mars rover photos, satellite imagery, and space data. Free with API key.
🧠 AI & LLM APIs
LOD DevTools AI API
Curated LLM endpoints for text generation, summarization, and analysis.
OpenAI API
GPT-4o, GPT-4o Mini, DALL-E, Whisper, TTS. $5 free credits.
Anthropic Claude API
Claude 3.5 Sonnet and Haiku. Best-in-class coding. $5 free credits.
Google Gemini API
Gemini 2.5 Pro/Flash. 15 RPM free. 1M token context window.
DeepSeek API
DeepSeek V3 and R1. 500K free tokens/day. Cheapest frontier model.
Mistral API
Mistral Large and Small. Free tier with rate limits. European hosting.
🔗 How to Use These APIs with Our DevTools
Many of these APIs are available through our unified DevTools API, which provides a single endpoint for color conversion, crypto prices, geolocation, weather, text analysis, and more.
Browse the full collection in our Free API Directory — filter by category, free tier limits, and authentication requirements.
💡 Pro tip: Use the DevTools API as your first stop — many endpoints are free, unlimited, and don't require API keys. For higher-volume needs, go direct to the source APIs listed above.