How to Choose the Best Development API in 2026
There are 120 Development APIs in our directory. Of these, 44 require no authentication, making them ideal for quick prototyping. 44 are rated beginner-friendly.
Scores last tested: 2026-08-10
Quick Comparison: Top 10 Development APIs
Ranked by API Score. Measured means we called a real endpoint of that API; Est. means the score is derived from metadata because the endpoint could not be called without credentials. Discontinued APIs are excluded.
| Name | API Score | Auth | HTTPS | CORS | Difficulty |
|---|---|---|---|---|---|
| DomainDb Info | 95 A+ Est. | No Auth | ✓ | ? | Beginner |
| GitHub | 94 A+ Measured | OAuth | ✓ | ✓ | Intermediate |
| ApicAgent | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| Beeceptor | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| Cloudflare Trace | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| CORS Proxy | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| Image-Charts | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| QuickChart | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| Screenshot | 92 A+ Est. | API Key | ✓ | ✓ | Intermediate |
| Sonar | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
Free Development APIs (No Auth)
These APIs require no API key or signup. Start using them immediately.
24 Pull Requests
⭐ Beginner's Pick24 Pull Requests is a community initiative that runs every December to encourage developers to contribute to open source projects.
Agify.io
⭐ Beginner's PickAgify.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.
API Grátis
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.
ApicAgent
⭐ Beginner's PickApicAgent 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.
APIs.guru
⭐ Beginner's PickAPIs.guru maintains a crowd-sourced directory of OpenAPI (Swagger) specification files for hundreds of public web APIs, all normalized to OpenAPI 3.0 format.
Beeceptor
⭐ Beginner's PickBeeceptor lets you create a mock REST API endpoint in seconds directly from your browser, without writing any server code.
Try It in 5 Minutes: 24 Pull Requests
Quick implementation example using 24 Pull Requests.
Using curl
curl -s -H 'Accept: application/json' 'https://24pullrequests.com/api/v1/projects'
JavaScript
const url = "https://24pullrequests.com/api/v1/projects";
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, 44 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. 44 APIs need no authentication, 53 require an API key, and 14 use OAuth.