Free Tools

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Open-source tools for developers and founders. Free forever, no sign-up required.

Generate QR codes for URLs, WiFi, email, and text

MRR, churn, LTV, CAC: calculate it all

Test prompts with GPT-4o Mini, side by side

Generate professional bios for any platform

Preview how your links appear on social media

Build trackable campaign URLs in seconds

Format, decode, and debug in one place

Create professional invoices, print to PDF

Build your own link page, download the HTML

Structure release notes, export clean HTML

Launch a coming-soon page in 60 seconds

Frame screenshots in phones, laptops, and browsers

Spot-check any URL from your browser