Free Dev Tools APIs — ranked by value

Developer utilities & infrastructure APIs

Scores rate free-tier value on a 1–10 scale. How scores work →

GitHub REST API Dev Tools Token Programmatic access to GitHub repositories, issues, pull requests, commits, users, and Actions. 60 req/hrOpenAPI
GitLab API Dev Tools Token REST and GraphQL API to manage GitLab projects, merge requests, pipelines, and CI/CD. 2k/minOpenAPI
npm Registry API Dev Tools No auth Query npm package metadata, versions, dist-tags, and download counts from the public registry. No published cap
PyPI JSON API Dev Tools No auth Read-only JSON API exposing Python package releases, metadata, and download URLs from PyPI. No published cap
JSONPlaceholder Dev Tools No auth Free fake REST API serving placeholder posts, users, and todos for prototyping and testing. No published cap
httpbin Dev Tools No auth HTTP request and response testing service that echoes headers, methods, status codes, and payloads. No published cap
QuickChart Dev Tools No auth Render Chart.js charts, QR codes, and graphs as images via a simple URL-based API. Fair use
HTML/CSS to Image Dev Tools API key Convert arbitrary HTML and CSS into PNG, JPG, or WebP images via a REST API. 5k/moSDK
ScreenshotOne Dev Tools API key Capture website screenshots and render PDFs from URLs with ad-blocking and full-page support. 100/moSDK
Urlbox Dev Tools API key Programmatic website screenshot and PDF rendering API with extensive customization options. 2k/moSDK
ipify Dev Tools No auth Minimal API that returns the caller's public IPv4 or IPv6 address in text or JSON. No limit
ifconfig.co Dev Tools No auth Returns your public IP plus user-agent and geo details in plain text or JSON for scripts. No published cap
DummyJSON Dev Tools No auth Fake REST API with products, carts, users, and auth endpoints for frontend prototyping. No published cap
Reqres Dev Tools No auth Hosted REST API that responds to real requests for users and registration to test CRUD flows. No published cap
Mockaroo Dev Tools API key Generate realistic mock data sets and mock REST endpoints in JSON, CSV, or SQL formats. 200/day
GoQR Code API Dev Tools No auth Generate and decode QR codes as images via a simple URL-based GET API, free and keyless. No published cap
is.gd URL Shortener Dev Tools No auth Free, keyless URL shortening and expansion API returning short links in JSON, XML, or plain text. 5 req/sec
Cleanuri Dev Tools No auth Simple no-auth URL shortener API that returns a short link from any long URL via POST. No published cap
Webhook.site Dev Tools No auth Instantly create unique URLs to inspect, debug, and replay incoming webhooks and HTTP requests. Fair use
Beeceptor Dev Tools No auth Spin up mock REST endpoints and inspect HTTP traffic without writing any backend code. 50 req/day
Cron-Job.org Dev Tools API key Free scheduled HTTP job runner with a REST API to create and manage cron jobs that ping your URLs. Fair use
Abstract API Email Validation Dev Tools API key Validate email deliverability, detect disposable addresses, and check MX records via REST. 100 msg/moSDK
Mailtrap Dev Tools Token Email testing sandbox and sending API that captures messages so test emails never reach real inboxes. 1k/moSDK
Sentry API Dev Tools Token Query and manage error tracking, issues, releases, and performance data programmatically. 40 req/secSDK
Vercel API Dev Tools Token Manage deployments, projects, domains, and environment variables on the Vercel platform via REST. Free tierSDK
Cloudflare API Dev Tools Token Control DNS, Workers, caching, Pages, and security settings across Cloudflare's edge via REST. 1.2k reqSDKOpenAPI
Open Source License API (licenses) Dev Tools No auth GitHub endpoint returning open-source license metadata and full license text by SPDX key. 60 req/hrOpenAPI
Gravatar API Dev Tools No auth Fetch globally recognized avatars and profile data by email hash for use in apps and dashboards. Fair use
WordsAPI Dev Tools API key Programmatic dictionary returning definitions, synonyms, rhymes, and word relationships in JSON. 2.5k req/day
Bored API (Activity) Dev Tools No auth Keyless API returning random activity suggestions, handy as a demo data source for tutorials. No published cap
Coolify API Dev Tools Token Self-hostable PaaS API to deploy and manage applications, databases, and services via REST. Self-hostedOpenAPI