Development APIs

APIs for development tools and services

9 APIs in this category · last checked 2 October 2026
9
APIs listed
4
need no API key (44%)
0
CORS enabled (0%)
9
HTTPS (100%)

This directory lists 9 development APIs. Use the filters below to narrow by authentication, HTTPS support and CORS. Every entry shows whether it needs authentication, serves over HTTPS and allows cross-origin requests, so you can pick one that fits your stack before you read a single doc page.

Showing 9 of 9 APIs

API Grátis

Aggregates dozens of free public Brazilian APIs such as postal code, company registry, currency and weather lookups into one searchable catalog for developers.

Auth: No HTTPS CORS: Unknown

24 Pull Requests

Returns JSON for the 24 Pull Requests December event, covering suggested projects, submitted contributions and signed up users, paginated at up to 99 items per page, no authentication needed.

Auth: No HTTPS CORS: Unknown

Abstract Screenshot

Turns any URL or raw HTML into a PNG, JPEG or GIF screenshot with adjustable viewport and injected CSS, free plan allows 100 requests a month and needs no credit card.

Auth: apiKey HTTPS CORS: Unknown

ApiFlash

Captures full page or viewport screenshots of web pages using headless Chrome on AWS Lambda, with ad and cookie banner blocking, free plan includes 100 screenshots a month and needs no credit card.

Auth: apiKey HTTPS CORS: Unknown

Agify.io

Predicts a person's likely age from a first name using statistics drawn from about one billion people, with country specific results, free plan allows 2,500 names a month after registering.

Auth: apiKey HTTPS CORS: Unknown

Azure DevOps

Lets you manage Azure DevOps projects, work items, repositories and pipelines over HTTP using a resource path and api version pattern, authenticated with OAuth or a personal access token.

Auth: OAuth HTTPS CORS: Unknown

apilayer userstack

Identifies browser, operating system and device type from a user agent string and returns JSON, free plan is limited to 100 requests a month and needs no credit card.

Auth: apiKey HTTPS CORS: Unknown

ApicAgent

Parses a user agent string and returns the browser, operating system and device type as JSON, free to use during its beta with no signup, handling about 140,000 requests a day.

Auth: No HTTPS CORS: Unknown

APIs.guru

A crowdsourced, searchable directory of machine readable OpenAPI and Swagger specifications for thousands of public APIs, useful for generating clients or testing tools against real schemas.

Auth: No HTTPS CORS: Unknown

Best Development APIs for Developers

A development API allows developers to integrate essential tooling directly into their workflows: version control systems, build servers, code quality checkers, and more. Whether you are automating a deployment pipeline or querying repository metadata, the right API saves days of manual work.

24 Pull Requests and APIs.guru need no key at all, making them the fastest way to start: one returns open source contribution data for a December coding event, the other is a searchable catalog of OpenAPI specs for thousands of public APIs. For screenshot capture, Abstract Screenshot and ApiFlash both give 100 free renders a month without a credit card, useful for thumbnail generation or visual testing. Agify.io suits quick name based demos with a generous free quota. Azure DevOps fits teams already on Microsoft tooling who need project and pipeline data. The pitfall in this category is authentication: free tiers often require registering for a key even when no payment is asked, and rate limits can be far tighter than they first appear once you move past a demo.

What to check before you pick one

  • Authentication model: Prefer APIs with simple API key auth or no auth for prototyping, and OAuth for production integrations.
  • Rate limits: Check free-tier limits early; GitHub API, for example, allows 60 unauthenticated requests per hour.
  • HTTPS and CORS support: Both are essential for front-end and serverless integrations.

Frequently Asked Questions

What are development APIs?

Development APIs are interfaces that provide programmatic access to developer tools, services, and infrastructure such as version control, CI/CD pipelines, testing frameworks, and build automation systems.

Which development APIs are free to use?

Many development APIs offer free tiers, including GitHub API, GitLab API, and various DevOps tools. CodeHelper's directory highlights auth requirements so you can quickly identify no-auth and free-tier options.

How do I integrate a development API into my project?

Click any API in this directory to visit its official documentation. Most development APIs provide SDKs, REST endpoints, and step-by-step quickstart guides for popular languages.

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