Developer Tools

Free Tools for Builders.

Every tool is completely free. No signup, no usage limits, no hidden fees. Built for developers who ship fast.

11 Developer Tools
100% Free
0 Signup Required
Free

Stripe Fee Calculator

Calculate exact Stripe fees for any scenario — domestic, international, currency conversion, Connect fees, and dispute costs.

Free

JSON Schema Forge

Paste JSON → get TypeScript types, Zod schemas, JSON Schema specs, OpenAPI definitions, and database migration SQL.

Free

Cron Expression Builder

Visual cron job scheduler with human-readable output. Test expressions with a virtual timeline, export for Vercel, Railway, Render.

Free

Color System Generator

Input a brand color → generate a full design token system. CSS variables, Tailwind config, accessible contrast pairs, and dark mode.

Free

Webhook Debugger

Get a unique URL, send webhooks to it, inspect headers, body, and timing. Replay webhooks and share debug sessions.

Free

API Response Mocker

Create mock API endpoints instantly. Define routes, response shapes, delays, and error rates. Get a live URL for frontend dev.

Free

README Generator AI

Describe your project or paste a GitHub URL → get a professional README.md with badges, installation, API docs, and contributing guide.

Free

SaaS Metrics Dashboard

Input MRR, churn, new customers → instantly see LTV, CAC ratio, quick ratio, growth rate, and net revenue retention. Exportable.

Free

Startup Cost Estimator

Input your stack decisions (hosting, auth, email, payments, CDN) → get monthly and yearly cost projections. Compare cloud providers.

Free

OG Image Generator

Create stunning Open Graph images for social media. Choose templates, customize colors, typography, and layout. Download as PNG.

Free

Regex Tester & Explainer

Write, test, and debug regular expressions with real-time match highlighting, capture group inspection, and plain-English explanations.

Start Building Today

All tools are free to use. No account needed, no credit card, no limits. Just pick a tool and get to work.