2026 Edition
Stop reinventing the wheel
Free APIs
Every Developer Should Know
2026
30 real, production-usable free APIs organized by category — weather, geolocation, auth, AI, media, communication, and payments — with direct links to actual docs, not a random copy-pasted list.
"The fastest way to ship a side project isn't writing more code — it's knowing which problem someone already solved for free, and reaching for that instead."
— The Boring Education Team
30
APIs covered
6
Categories
$0
Free tier on every one
100%
Real, linked docs
Free APIs Every Dev Should Know · 2026
02
Category 01 · Core Utility Data
The APIs That Show Up in Nearly Every Project
1
Weather
OpenWeatherMap
Current weather, hourly and 5-day forecasts, and historical data for any location worldwide. The default choice for any project that needs weather — free tier covers 1,000 calls/day, which is plenty for most side projects and demos.
2
Geolocation & IP lookup
ipapi / ip-api.com
Turn a visitor's IP address into city, country, timezone, and ISP data with a single GET request — no API key needed for basic non-commercial use on ip-api.com. Perfect for localization, fraud checks, or "detect my location" features without asking browser permission.
3
Maps & address search
OpenStreetMap Nominatim
Free geocoding and reverse geocoding — turn an address into coordinates or coordinates into an address — backed by the entire OpenStreetMap dataset. No billing setup required, unlike most map providers, though usage-policy rate limits apply for the public instance.
4
Currency & exchange rates
ExchangeRate-API
Live and historical currency conversion rates for 160+ currencies, updated daily on the free tier. Common in e-commerce checkouts, budgeting apps, and any project that needs to display a price in more than one currency.
5
Country & reference data
REST Countries
Every country's flag, capital, currency, languages, calling code, and borders in one structured, free, no-key API. Genuinely useful for onboarding forms, dropdown pickers, and geography-heavy dashboards instead of hardcoding a stale country list.
Always check the rate limits before you build around one of these. Free tiers can drop from generous to restrictive without warning when a provider changes pricing — cache responses where you can, and design your app so swapping providers later doesn't mean a rewrite.
Free APIs Every Dev Should Know · 2026
03
Category 02 · Auth & Backend-as-a-Service
Skip Building Login and a Database From Scratch
6
Auth
Firebase Authentication
Email/password, Google, and social sign-in with session management handled for you, backed by Google's infrastructure. Generous free tier makes it the default choice for most solo and small-team projects that just need working auth fast.
7
Database + auth + storage
Supabase
An open-source Firebase alternative built on Postgres — auto-generated REST and realtime APIs, row-level security, auth, and file storage in one free-tier project. Ideal when you want a real relational database instead of a document store.
8
Drop-in login UI
Clerk
Pre-built, customizable sign-up/sign-in components plus user management and session handling via API — bolt on production-grade auth UI without designing your own forms. The free tier covers a solid number of monthly active users for early-stage projects.
9
Fake data for prototyping
JSONPlaceholder
A free fake REST API returning realistic posts, comments, users, and todos — built specifically for testing frontend code and tutorials before a real backend exists. No signup, no key, just point a fetch call at it.
10
Realistic seed data
RandomUser.me
Generates realistic-looking fake user profiles — name, address, photo, email — for populating a demo user list without ever touching real personal data. Great for building and screenshotting a UI before real users exist.
Pick your backend-as-a-service before you write real business logic. Switching between Firebase, Supabase, and a custom backend later means rewriting your data layer — decide early based on whether you need a relational database (Supabase) or fastest possible setup (Firebase).
Free-Tier Limits at a Glance
| Service | Free Tier Highlights | Best For |
|---|---|---|
| Firebase Auth | 50,000 monthly active users free | Fast setup, mobile + web |
| Supabase | 500MB database, 50,000 MAU free | Relational data + realtime |
| Clerk | 10,000 MAU free | Prebuilt auth UI components |
Free APIs Every Dev Should Know · 2026
04
Category 03 · AI & Machine Learning
Add Intelligence Without Training Your Own Model
11
Thousands of hosted models
Hugging Face Inference API
Run text generation, translation, summarization, image classification, and thousands of other community models via one API without hosting anything yourself. The free tier is rate-limited but genuinely usable for prototypes and small projects.
12
Google's model family
Google Gemini API
Text, vision, and multimodal generation with a genuinely free tier (rate-limited requests per minute) through Google AI Studio — no credit card required to get an API key and start building. A solid first LLM API for a hobby project.
13
Text classification & embeddings
Cohere API
Text generation, embeddings, and classification with a free "trial" API key meant specifically for evaluation and small projects — no payment info needed to start. Strong option specifically for building search or recommendation features around embeddings.
14
Speech-to-text, on your machine
OpenAI Whisper (open-source model)
Not a hosted API, but a free, open-source speech-to-text model you can run yourself with no per-call cost at all — the best option when you want transcription without any usage limits or billing. Pair it with a small Flask/FastAPI wrapper to expose it as your own endpoint.
15
Sentiment & language detection
MeaningCloud API
Sentiment analysis, language detection, and text classification with a free tier of monthly requests, no infrastructure required. A lighter-weight option than a full LLM when all you need is "is this review positive or negative."
Free AI tiers are rate-limited, not unlimited. Build in retry logic and graceful fallbacks from day one — a demo that works fine at 10 requests can hit a wall at 1,000, and users notice a broken feature far more than a slow one.
Free APIs Every Dev Should Know · 2026
05
Category 04 · Media & Content
Stock Photos, Video, and News Without Licensing Headaches
16
High-quality stock photos
Unsplash API
Search and pull high-resolution, free-to-use photos directly into an app via API, with proper attribution handled through the response metadata. The default choice for placeholder or hero images in demos and portfolio projects.
17
Photos and video
Pexels API
Free stock photos and video clips with a straightforward API and a generous free-tier request limit, no attribution strictly required (though appreciated). A solid second source when Unsplash's library doesn't have what you need.
18
Global news headlines
NewsAPI
Search and pull headlines and articles from thousands of news sources worldwide, filterable by keyword, source, and date. The free "developer" tier is meant for non-commercial and local testing — good for building a news dashboard project.
19
Video platform data
YouTube Data API
Search videos, pull channel stats, playlist contents, comments, and metadata directly from YouTube with a generous daily free quota. Powers everything from a "latest videos" widget to a full content analytics dashboard.
20
Community discussion data
Reddit API
Pull posts, comments, and subreddit data for building content aggregators, sentiment tools, or research projects, with a free tier for lower-volume, non-commercial use. Requires registering an app and following Reddit's API terms.
Attribution & License Notes
📸 Unsplash — attribution appreciated
Free for commercial and personal use; crediting the photographer isn't strictly required but is good practice and encouraged by their API terms.
📸 Pexels — no attribution required
Photos and videos are free to use for commercial and non-commercial purposes without crediting the source, per their license.
📰 NewsAPI — read the tier terms
The free "Developer" plan is explicitly for testing and non-commercial projects — check current terms before shipping anything commercial.
💬 Reddit — respect the API terms
Reddit's API terms and rate limits have changed before and can again — always check the current developer terms before building around it.
Free APIs Every Dev Should Know · 2026
06
Category 05 · Communication
Send Email, SMS, and Push Without Your Own Mail Server
21
Transactional email
SendGrid API
Send transactional and marketing emails — password resets, receipts, notifications — with reliable deliverability and a free tier covering a set number of emails per day. The go-to when "just use SMTP" starts causing deliverability problems.
22
Send email straight from frontend JS
EmailJS
Send emails directly from client-side JavaScript without a backend at all — genuinely useful for a portfolio contact form on a static site. Free tier covers a modest monthly send volume, enough for most personal projects.
23
SMS, voice & WhatsApp
Twilio API
Send SMS, make calls, and message over WhatsApp programmatically — the industry-standard communications API. New accounts get free trial credit to build and test with real phone numbers before committing to paid usage.
24
Push notifications
OneSignal API
Web, mobile, and in-app push notifications with a free tier covering unlimited subscribers on core messaging features. Considerably faster to integrate than building your own push infrastructure from scratch.
25
Bot & workspace messaging
Slack Web API
Post messages, build slash commands, and react to workspace events — completely free for a workspace's own integrations and internal tools. A common choice for build notifications, alerting, and internal dashboards.
Common Mistakes When Wiring These In
🚩 Putting API keys in frontend code
Email and SMS provider keys belong on a server or serverless function — a key shipped in client-side JS can be scraped and abused for spam within hours.
🚩 No rate limiting on your own endpoint
If your backend calls a paid-beyond-free-tier API, add your own rate limiting — one bug in a retry loop can burn a month's free quota in minutes.
🚩 Ignoring webhook verification
Twilio, SendGrid, and similar services sign their webhook payloads — skipping signature verification means anyone can fake a delivery event to your endpoint.
🚩 Not reading the free-tier fine print
"Free" often means free for testing or non-commercial use only — confirm the terms before a free-tier integration becomes a launch-day surprise.
Free APIs Every Dev Should Know · 2026
07
Category 06 · Finance, Payments & Everyday Utilities
The Practical Ones That Round Out a Real Project
26
Stocks & market data
Alpha Vantage API
Real-time and historical stock, forex, and crypto data along with technical indicators, free with an API key and a per-minute request limit. A common backbone for finance-tracking dashboards and portfolio-simulator side projects.
27
Crypto prices
CoinGecko API
Prices, market caps, and historical data for thousands of cryptocurrencies with a genuinely free public tier and no API key required for basic endpoints. The most beginner-friendly option for a crypto tracker project.
28
Test payments end-to-end
Stripe API (test mode)
Build and fully test an entire checkout flow — cards, subscriptions, refunds, webhooks — for free in test mode with fake card numbers, before ever processing a real transaction. The standard for learning payments the right way.
29
QR codes on demand
QR Server API (goQR.me)
Generate a QR code image from any text or URL with a single GET request — no key, no signup. Small but genuinely handy for event tickets, sharing links, or "scan to pay" style features in a weekend project.
30
URL shortening
TinyURL API
Programmatically shorten long URLs for sharing, analytics-friendly links, or cleaner QR codes, with a free tier for basic shortening requests. Simple, reliable, and one of the longest-running link shorteners still offering a public API.
Pick the Right One — By Project Type
Match the API to what you're actually building
🟥 Portfolio / Personal Site
Unsplash or Pexels for images
EmailJS for the contact form
GitHub API for a live projects feed
🟧 SaaS Prototype
Supabase or Firebase for backend
Stripe test mode for billing
SendGrid for transactional email
🟩 Data / Finance Dashboard
Alpha Vantage or CoinGecko
ExchangeRate-API for FX
NewsAPI for market headlines
Before You Ship, Check This List
API Integration Checklist
API keys live in environment variables, never committed to Git
You've read the free-tier rate limit and what happens when you hit it
Responses are cached where the data doesn't change every request
Error handling covers the provider being down, not just happy path
You know whether the free tier allows commercial use before launch
Free APIs Every Dev Should Know · 2026
08
Master Link List
Every API From This Roadmap, In One Place
🌦️ OpenWeatherMap
Current, forecast, and historical weather data for any location.
🗺️ Nominatim (OpenStreetMap)
Free geocoding and reverse geocoding on OpenStreetMap data.
💱 ExchangeRate-API
Live and historical currency conversion for 160+ currencies.
🔐 Firebase Authentication
Login and session management with a generous free tier.
🧠 Hugging Face Inference API
Thousands of hosted ML models behind one free-tier API.
Tools by TBE — Use These
Tech Yatra — Learning roadmaps
DSA Yatra — Daily practice
Prep Yatra — Interview tracker
Resume Yatra — ATS-ready resume
Shiksha — Free courses
Community — Peer study groups
Build Something This Weekend 🚀
Pick two APIs from this list and pair them into a real mini-project — weather + maps, or auth + payments. Shipping something small beats bookmarking a long list you never open again.
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