The 116 best APIs & Dev Tools

AI CLI

Generate text, images and video from the command line.

Steel

Open-source browser API for running and controlling cloud browsers at scale.

Domain SDK

API for adding, verifying and monitoring customer domains.

Photon Spectrum

Open-source framework for connecting AI agents across messaging platforms.

Toolcraft

Open-source starter kit and UI library for building AI design apps.

Dnd Kit

Framework-agnostic toolkit for building drag and drop interfaces.

Email SDK

TypeScript SDK for transactional email across providers, one clean API.

OpenTUI

Terminal UI core written in Zig with TypeScript bindings for building CLIs.

Autosana

End-to-end testing that writes and maintains the tests with AI.

Formcarry

Form endpoint that collects submissions without writing a backend.

Context.dev

Scraping API that returns structured data instead of raw HTML.

Agent Browser

Browser automation CLI built for AI agents, with debugging built in.

Portless

Swaps localhost port numbers for stable .localhost URLs during development.

Ship Studio

Free open-source desktop app that handles the shipping steps freelancers repeat.

Emulate

Stateful API emulation so integrations can be tested in CI.

Sandbox SDK

One API across several sandbox providers for running untrusted code.

TesterArmy

AI QA testing across web and mobile, run before each release.

Polypane

The browser for ambitious web developers and designers.

GitHub

Where the world builds software, code, review and ship.

GitLab

The complete DevOps platform in a single application.

Cloudflare

The connectivity cloud, security, performance and edge compute.

Clerk

Complete user management and authentication for modern apps.

Postman

The API platform for building and using APIs.

Twilio

APIs for SMS, voice, video and authentication.

Resend

The email API for developers, built on React Email.

Sentry

Application monitoring and error tracking for developers.

Algolia

The fast and reliable search and discovery API platform.

RapidAPI

The world's largest API hub to find and connect to APIs.

Hoppscotch

An open-source, lightweight API development ecosystem.

Mintlify

Beautiful, AI-native documentation that converts users.

Retool

The fast way to build internal tools and business apps.

PostHog

The open-source product analytics suite for engineers.

Snipcart

Add a shopping cart to any website with a few lines of code.

Stripe

Payments infrastructure and financial APIs for the internet.

Lago

The open-source metering and usage-based billing platform.

Polar

Monetization for developers, payments, subscriptions and more.

Storybook

The industry-standard tool to build and document UI components.

CodeRabbit

AI-powered code reviews right inside your pull requests.

Vite

The next-generation frontend build tool, blazing fast.

Bun

A fast all-in-one JavaScript runtime, bundler and package manager.

Deno

A secure, modern runtime for JavaScript and TypeScript.

tRPC

End-to-end typesafe APIs made easy, no schemas or codegen.

WorkOS

APIs to make your app enterprise-ready, SSO, SCIM and more.

Insomnia

The open-source API client for REST, GraphQL and gRPC.

Bruno

A fast, Git-friendly, open-source API client.

ngrok

Put your localhost on the internet with secure tunnels.

Doppler

The platform to manage secrets and environment variables.

Trigger.dev

Open-source background jobs and workflows for developers.

Inngest

Durable functions and workflows for any backend.

Novu

The open-source notification infrastructure for developers.

Val Town

Write and deploy tiny JavaScript functions from the browser.

Pipedream

Connect APIs and build workflows with code-level control.

Postmark

Fast, reliable transactional email delivery for apps.

Formspree

Handle form backends and submissions without a server.

Getform

A form backend platform for designers and developers.

RevenueCat

In-app subscriptions and purchases made easy for apps.

CodeCanyon

Buy and sell scripts, plugins and code from developers.

DiceBear

An avatar library and API with many fun styles.

Fontsource

Self-host open-source fonts in a neatly bundled npm package.

Greptile

AI that understands your codebase for reviews and answers.

Meilisearch

A fast, open-source, hyper-relevant search engine.

Typesense

An open-source, typo-tolerant search engine.

Apidog

An all-in-one API design, testing and documentation tool.

Scalar

Open-source, beautiful API documentation and references.

Apollo GraphQL

The platform to build and scale a unified GraphQL API.

Hygraph

A federated, GraphQL-native headless content platform.

Playwright

Reliable end-to-end testing for modern web apps.

Cypress

Fast, easy and reliable testing for anything in a browser.

Vitest

A blazing-fast unit test framework powered by Vite.

BrowserStack

Test your web and mobile apps on real devices and browsers.

Liveblocks

Ready-made features to add collaboration to your product.

PartyKit

Build real-time, collaborative and multiplayer apps.

Pusher

Hosted APIs to build real-time apps at scale.

Checkly

Monitoring and synthetic testing for developers, as code.

Chromatic

Visual testing and review for Storybook UI components.

Appsmith

An open-source platform to build internal tools fast.

Mailtrap

An email delivery platform to test, send and control email.

LogRocket

Session replay and product analytics to fix issues fast.

GrowthBook

Open-source feature flags and A/B testing.

GitBook

A modern documentation platform for teams and products.

Plaid

Connect apps to users' bank accounts securely.

Braintree

A full-stack payments platform by PayPal.

Wappalyzer

Identify the tech stack of any website instantly.

React Developer Tools

Inspect and debug the React component tree in your browser.

Vue.js devtools

Browser devtools for debugging Vue.js applications.

JSON Viewer Pro

Format, view and explore JSON beautifully in the browser.

WhatRuns

Discover the technologies running on any website.

Octotree

Browse GitHub repositories with a fast code tree sidebar.

Homebrew

The missing package manager for macOS, install anything from the terminal.

tldraw

A tiny, infinite canvas whiteboard SDK and app.

Eraser

The whiteboard for engineering teams, diagrams as code.

Mermaid

Create diagrams and charts from text and code.

ScrapingBee

A web scraping API that handles proxies and headless browsers.

ScraperAPI

Handle proxies, browsers and CAPTCHAs with one API.

Browserless

Headless browser automation and scraping as a service.

Avocode

Inspect and hand off designs to code, from any tool.

SVGViewer

Optimize, edit and preview SVGs right in the browser.

Puppeteer

A Node library to control headless Chrome for automation.

Zod

TypeScript-first schema validation with static inference.

ESLint

The pluggable linting utility for JavaScript and JSX.

Prettier

An opinionated code formatter for many languages.

Biome

A fast formatter and linter for the web, in Rust.

Turborepo

A high-performance build system for JavaScript monorepos.

Nx

A smart, extensible build framework and monorepo tool.

pnpm

A fast, disk-space-efficient package manager.

Charles Proxy

An HTTP proxy and monitor to debug network traffic.

Mux

Video streaming and analytics API for developers.

1Password

Securely store, share and autofill passwords and secrets.

BuildShip

No-code API creation.

Firma.dev

Firma.dev offers an ultra-low-cost e-signature API designed for developers, allowing seamless integration into…

Keras

Deep learning API for fast, elegant, maintainable ML models. Supports JAX, TensorFlow, PyTorch.

Linq

Linq provides a robust API for integrating messaging capabilities like iMessage, RCS, and SMS directly into apps,…

Logo.dev

API to fetch logos for any brand in real time.

Orshot

Automate image creation for marketing with templates, API, and integrations.

Sent

Sent offers a messaging API that streamlines communication by integrating SMS, WhatsApp, and RCS into a single…

Yoku

Yoku provides reliable company data via its Brand Identity API, enhancing user experience and workflows.