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THE BUILDING BLOCKS

Development APIs

Prototype interfaces with placeholder posts, products, and user profiles. Use simulated data to test loading and error states; a successful write to a mock API may not persist.

261APIs to explore

Showing 1–36 of 261 APIs

Docs reviewed
Development

JSONPlaceholder

Fake posts, users, comments, and todos for testing your next app.

◇ No keyFree access
Docs reviewed
Development

DummyJSON

Realistic placeholder products, carts, users, and recipes for prototypes.

◇ No keyFree access
Docs reviewed
Development

Random User

Generate sample user profiles for interface demos and test fixtures.

◇ No keyFree access
Community listing
Development

Userstack

Secure User-Agent String Lookup JSON API

Reported: OAuthCheck pricing
Community listing
Development

24 Pull Requests

Project to promote open source collaboration during December

◇ Reported: No keyCheck pricing
Community listing
Development

Aether Bridge

Autonomous agent team management and API workflow orchestration

Reported: API keyCheck pricing
Community listing
Development

Agify.io

Estimates the age from a first name

◇ Reported: No keyCheck pricing
Community listing
Development

Amazonscraperapi

Amazon product, search & batch scraping API with residential proxies (1000 free)

Reported: API keyCheck pricing
Community listing
Development

AmberOne

Turn any website into a build-ready Android, iOS, PWA or Electron app project

Reported: API keyCheck pricing
Community listing
Development

API Grátis

Multiples services and public APIs

◇ Reported: No keyCheck pricing
Community listing
Development

ApicAgent

Extract device details from user-agent string

◇ Reported: No keyCheck pricing
Community listing
Development

ApiFlash

Chrome based screenshot API for developers

Reported: API keyCheck pricing
Community listing
Development

APIs.guru

Wikipedia for Web APIs, OpenAPI/Swagger specs for public APIs

◇ Reported: No keyCheck pricing
Community listing
Development

APIzone

Independent uptime & status monitoring for 200+ popular APIs

◇ Reported: No keyCheck pricing
Community listing
Development

Aquanode

Live GPU rental prices and availability across nine cloud providers

◇ Reported: No keyCheck pricing
Community listing
Development

Azure DevOps

The Azure DevOps basic components of a REST API request/response pair

Reported: API keyCheck pricing
Community listing
Development

Base

Building quick backends

Reported: API keyCheck pricing
Community listing
Development

Beeceptor

Build a mock Rest API endpoint in seconds

◇ Reported: No keyCheck pricing
Community listing
Development

Bitbucket

Bitbucket API

Reported: OAuthCheck pricing
Community listing
Development

Blague.xyz

La plus grande API de Blagues FR/The biggest FR jokes API

Reported: API keyCheck pricing
Community listing
Development

Blitapp

Schedule screenshots of web pages and sync them to your cloud

Reported: API keyCheck pricing
Community listing
Development

Blynk-Cloud

Control IoT Devices from Blynk IoT Cloud

Reported: API keyCheck pricing
Community listing
Development

Bored

Find random activities to fight boredom

◇ Reported: No keyCheck pricing
Community listing
Development

Brainshop.ai

Make A Free A.I Brain

Reported: API keyCheck pricing
Community listing
Development

BrewPage

Free hosting for HTML, JSON, key-value, files, multi-file sites with short URLs and TTL retention

◇ Reported: No keyCheck pricing
Community listing
Development

Browshot

Easily make screenshots of web pages in any screen size, as any device

Reported: API keyCheck pricing
Community listing
Development

CDNJS

Library info on CDNJS

◇ Reported: No keyCheck pricing
Community listing
Development

Changelogs.md

Structured changelog metadata from open source projects

◇ Reported: No keyCheck pricing
Community listing
Development

Ciprand

Secure random string generator

◇ Reported: No keyCheck pricing
Community listing
Development

Cloudflare

Manage DNS, CDN, Workers and other services; documented with an official OpenAPI 3.0 spec

Reported: API keyCheck pricing
Community listing
Development

Cloudflare Trace

Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More

◇ Reported: No keyCheck pricing
Community listing
Development

Contentful Images

Used to retrieve and apply transformations to images

Reported: API keyCheck pricing
Community listing
Development

CORS Proxy

Get around the dreaded CORS error by using this proxy as a middle man

◇ Reported: No keyCheck pricing
Community listing
Development

CountAPI

Free and simple counting service. You can use it to track page hits and specific events

◇ Reported: No keyCheck pricing
Community listing
Development

crates.io

Rust crate versions, downloads and dependency metadata

◇ Reported: No keyCheck pricing
Community listing
Development

Crawl Readiness

Check if AI crawlers (ChatGPT, Claude, Perplexity, 30+ others) can access any website

Reported: API keyCheck pricing
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Know what’s been checked. Reviewed guides include provider documentation and examples. Community listings contain reported information that may have changed. Our methodology →