Knife Sharpening Angle Trainer – Hold Your Pocket Stone Correctly
Use your phone's gyroscope to practice holding a knife at exactly 20° on a flat stone. Build muscle memory for field sharpening.
UD5 Toolkit
Master the Braille alphabet with instant feedback, quizzes, and a handy reference chart.
Tap/Click the dots to form a letter (Explore mode)
Select the correct letter:
Use your phone's gyroscope to practice holding a knife at exactly 20° on a flat stone. Build muscle memory for field sharpening.
A random letter appears; you must select the correct semaphore position from 4 choices. Scouts & maritime.
Randomly prompts you to press a Windows keyboard shortcut (e.g., Win+E). Learn to be a power user.
Practice carrom shots on a virtual board. Visualize rebounds and plan your strike on the physical board.
Paste text and set display speed for Rapid Serial Visual Presentation. Train your reading speed.
Select a tool (VS Code, Figma, etc.) and get random shortcut prompts. Press the keys to practice.
Generate customizable alphabet tracing sheets with uppercase and lowercase letters. Select letters to focus on. Instant print. Local only.
Practice mental arithmetic with customizable operators and digit count. Timed rounds, score tracking. Works offline. Improve your brain speed.
Create a halftone dot pattern from two colors. Adjust dot size and spacing. Get the CSS or download as image.
Random letters appear; you must type the correct code word quickly. Beat your high score. Learn the NATO alphabet.
Test your knowledge of American Sign Language letters. See a sign and type the letter. Improve receptive skills. Local.
Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
Reverse the NATO phonetic alphabet. Paste 'Bravo Romeo Alpha Victor Oscar' and get 'Bravo'. Essential for call center transcripts.
A sequence of digits flashes for a few seconds. Type it back. Increase length. Improve your working memory.
Convert short text into a black‑and‑white Braille bump image ready for embossing. Educational and inclusive.
Practice sending Morse code using a virtual straight key. Visual feedback and audio tone. Learn timing and proper fist.
A random note appears on the grand staff; click the correct piano key. Improve sheet music reading. Multiple clefs.
Test your knowledge of the NATO phonetic alphabet. Timed quiz with letter‑to‑code and code‑to‑letter modes.
See all elements sorted alphabetically by symbol. Picture and atomic weight. Beautifully styled static list.
A random note name appears; click the correct position on the bass fretboard. Beat your time and accuracy.
See a random letter/number and tap the Morse sequence. Instant feedback. Practice the full international Morse alphabet.
Enter Braille dot numbers (1‑6) or paste Unicode Braille to decode into English text. Companion to text‑to‑Braille.
Convert any phrase into the NATO phonetic alphabet (Alpha, Bravo, Charlie…). Copy or hear pronunciation. Useful for call centers.