ivanuhka4

Quick math training in your browser with speed rounds and local high scores.

Play a compact 9x9 Sudoku in the extension and jump to more puzzles on sudoku-play.org.

Fast local on-page SEO analysis with popup and full page audit modes.

Flip a simple virtual coin from the browser toolbar.

Measure ambient noise in your browser. A quick decibel estimate from your microphone — nothing is recorded or stored.