M
API Matrix

How to Choose the Best Development API in 2026

There are 120 Development APIs in our directory. Of these, 52 require no authentication, making them ideal for quick prototyping. 52 are rated beginner-friendly.

Last updated: April 2026

Quick Comparison: Top 10 Development APIs

Name Auth HTTPS CORS Difficulty
Userstack OAuth ✓ ? Advanced
24 Pull Requests No Auth ✓ ✓ Beginner
Agify.io No Auth ✓ ✓ Beginner
API Grátis No Auth ✓ ? Beginner
ApicAgent No Auth ✓ ✓ Beginner
ApiFlash API Key ✓ ? Intermediate
APIs.guru No Auth ✓ ? Beginner
Azure DevOps API Key ✓ ? Intermediate
Base API Key ✓ ✓ Intermediate
Beeceptor No Auth ✓ ✓ Beginner
See all 120 Development APIs compared side by side →

Free Development APIs (No Auth)

These APIs require no API key or signup. Start using them immediately.

24 Pull Requests

⭐ Beginner's Pick
87

24 Pull Requests is a community initiative that runs every December to encourage developers to contribute to open source projects.

No Auth Beginner HTTPS 228ms

Agify.io

⭐ Beginner's Pick
82

Agify.io is a free API that predicts the likely age of a person based solely on their first name, using a database of over 350 million historical records.

No Auth Beginner HTTPS 529ms

API Grátis

57

API Grátis is a Brazilian API aggregator that bundles multiple free utility services including CEP (postal code) lookup, CNPJ (company registry) data, vehicle plate information, and more — all under a single authentication token.

No Auth Beginner HTTPS 44ms

ApicAgent

⭐ Beginner's Pick
92

ApicAgent parses User-Agent strings into structured device and browser information, returning details like browser name, version, OS, device type, and whether the client is a bot.

No Auth Beginner HTTPS 109ms

APIs.guru

⭐ Beginner's Pick
87

APIs.guru maintains a crowd-sourced directory of OpenAPI (Swagger) specification files for hundreds of public web APIs, all normalized to OpenAPI 3.0 format.

No Auth Beginner HTTPS 146ms

Beeceptor

⭐ Beginner's Pick
92

Beeceptor lets you create a mock REST API endpoint in seconds directly from your browser, without writing any server code.

No Auth Beginner HTTPS 71ms
View all free Development APIs →

Try It in 5 Minutes: 24 Pull Requests

Quick implementation example using 24 Pull Requests.

Using curl

curl https://24pullrequests.com/api

JavaScript

// ⚠️ Note: This URL may be a documentation page. Check official docs for actual API endpoint.
const url = "https://24pullrequests.com/api";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

New to APIs? Read our Getting Started Guide →

Frequently Asked Questions

How many Development APIs are available?

There are 120 Development APIs in our directory as of 2026.

Are there free Development APIs?

Yes, 52 Development APIs require no authentication and are completely free to use.

What is the easiest Development API to use?

24 Pull Requests is one of the easiest to get started with. It is rated as beginner-level and requires no authentication.

Do I need an API key for Development APIs?

It depends. 52 APIs need no authentication, 53 require an API key, and 14 use OAuth.

Explore Development APIs

Browse All APIs → Side by Side →