Knife Sharpening Angle Trainer β Hold Your Pocket Stone Correctly
Use your phone's gyroscope to practice holding a knife at exactly 20Β° on a flat stone. Build muscle memory for field sharpening.
UD5 Toolkit
Use your phone's gyroscope to practice holding a knife at exactly 20Β° on a flat stone. Build muscle memory for field sharpening.
Choose a root note and scale type to see the scale notes highlighted on a piano keyboard. Covers major, natural minor, harmonic minor, and modes.
Select a piano key to see its frequency in Hz and MIDI note number. Great for tuning, synthesis, or music theory exploration with interactive keyboard.
A random letter appears; you must select the correct semaphore position from 4 choices. Scouts & maritime.
Keep your piano at 40β60% RH. Log readings and get reminders to fill humidifier/dehumidifier.
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.
Practice mental arithmetic with customizable operators and digit count. Timed rounds, score tracking. Works offline. Improve your brain speed.
Divide pooled tips among staff based on hours worked or weighted percentages. Ensures fair distribution. Instant local calculation.
Random letters appear; you must type the correct code word quickly. Beat your high score. Learn the NATO alphabet.
Flashcards for learning Braille. See the dot pattern and type the letter. Track your speed and accuracy. Accessibility education.
Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
A sequence of digits flashes for a few seconds. Type it back. Increase length. Improve your working memory.
Practice sending Morse code using a virtual straight key. Visual feedback and audio tone. Learn timing and proper fist.
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.
Pick a scale (Major, Harmonic Minor, Dorianβ¦) and a root note. Shows the notes and highlights them on piano & guitar fretboard.
Click a root key and chord type (Maj, min, 7th) to see the notes highlighted on a piano keyboard. Learn chords fast.
Play a virtual piano keyboard using mouse or computer keys. Sustain and octave control. Record and play back your tune.
Fairly distribute pooled tips among staff based on hours worked or points. Customizable percentages. All calculations local and private.