Why sign in?

Most utilities are free to use after creating an account. Here is exactly what an account gives you and what we store.

• Access to the full catalog of 27 engineering utilities
• Your reactions and comments under tools and posts
• Synced preferences: theme, language, display mode, fullscreen
• Usage-based sorting so your most-used tools surface first

Is it free?

Yes. An account is free and always will be for the current catalog. The first three utilities work without any account at all.

What do we store?

Only your login identity (email/avatar from Google or GitHub), your settings and your comments/reactions. Everything is stored in Supabase (EU); calculations run entirely in your browser and never leave it. You can delete your account and all data at any time from Settings.