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Free Developer Tools

Free APIs and tools for developers. No signup, no API key, no credit card.

OG Image Generator

API

Generate Open Graph images dynamically. Pass title, subtitle, and brand as query params. Returns a 1200×630 PNG.

/api/og?title=My+Blog+Post&subtitle=Description

PageSpeed Badge

API

Generate embeddable SVG badges showing your PageSpeed score. Perfect for READMEs and landing pages.

/api/badge.svg?url=example.com&score=95

URL Validator

API

Validate any URL and get status code, headers, content type, and server info. Free with CORS support.

/api/validate-url?url=https://example.com

Web App Cost Calculator

Tool

Interactive calculator to estimate custom web app and SaaS development costs. Pick features, get instant price.

tools.costCalculator.example

SEO Audit Tool

Tool

Free automated technical SEO audit. Check meta tags, headings, mobile speed, and Core Web Vitals.

tools.seoAudit.example

Next.js SaaS Starter

Open Source

Production-ready SaaS starter with Next.js 15, Firebase, Stripe, and shadcn/ui. Open source on GitHub.

tools.nextjsStarter.example

Why Free?

These tools are built by AppBrewers to solve real problems we face every day. We make them free because:

  • They cost us almost nothing to host on Vercel Edge
  • They help developers discover AppBrewers
  • They earn backlinks naturally when people use them
  • They make the web better for everyone

Need Something Custom?

We build web apps, SaaS platforms, and AI automation systems. Get a fixed-price quote in 24 hours.

Get a Free Quote