Beat Sync Tester - Online Tap Tempo & BPM Counter
Tap any key to the beat and get the BPM (beats per minute). Useful for DJs, musicians, and running. Simple and accurate.
UD5 Toolkit
requestAnimationFrame for smooth, jitter-free display.
Tap any key to the beat and get the BPM (beats per minute). Useful for DJs, musicians, and running. Simple and accurate.
Select a desired emotional state (calm, energize) and get a suggested song structure with BPM range.
Guided breathing exercises with animated circle for inhale/hold/exhale. Includes box breathing, 4-7-8, and resonant breathing patterns. Customizable intervals.
Pick your egg style and get a precise timer with visual progress. Perfect boiled eggs every time. No app needed.
Manually manage flashcards with 5 virtual Leitner boxes. See when to review each box next. All data local storage.
Create custom flashcards and review them with a simple spaced repetition algorithm. Data stored in your browser. No sign-up required.
Paste a line of poem and see which syllable stresses create a particular meter. Educational tool.
Compare all CSS easing presets side by side on a bouncing ball. See which curve fits your UI animation.
Multiple digital counters for tracking stitches, rows, and pattern repeats. Increment, reset. Works on mobile.
Drag songs into a setlist and see total duration. Perfect for planning a concert or DJ set.
Generate cryptographically secure BIP39 mnemonic phrases (12 or 24 words) for HD wallet seeds. All entropy generated locally.
Create vertically oriented text layouts with `writingβmode`. See the effect and copy the complete CSS. For vertical languages.
Enter a regular expression and see a visual railroad diagram explaining the pattern. Learn and debug regex.
Create a pure CSS countdown timer with a flipping number effect. Adjust duration and style. No JavaScript needed for display.
Turn a cardinal number (23) into its ordinal form (23rd). Supports large numbers. Simple and quick.
Load an SRT file and shift all timestamps forward or backward by milliseconds or seconds. Fix out-of-sync subtitles instantly. Download corrected file.
Create seamless CSS background patterns like stripes, polka dots, checkerboard. Adjust size and colors. Copy the tiny CSS.
Toggle between full and reduced motion on a live animated page. See how to design for vestibular disorders. Educational.
Paste word pairs (or load pre-made sets) and practice with randomized flashcards. Flip to reveal translation, mark as known/unknown. Local data, no login.
Add, remove, push, pop items and watch the data structure change visually. Supports arrays, stacks, and queues. For CS students.
Apply East Asian glyph variants like jis78, proportional-width, ruby. See the difference instantly. For CJK typography.
Create cards and review using a spaced repetition algorithm (Leitner box simulation). Cards stored locally. Improve exam prep.
Generate customizable alphabet tracing sheets with uppercase and lowercase letters. Select letters to focus on. Instant print. Local only.
Toggle OpenType features like liga, smcp, tnum, and see the text update. Support for variable fonts. Typography nerds.
Simulate reduced motion preference and test your animations. Copy the media query snippet. Keep your users safe.
Detect browser support for fontβtech() and fontβformat() values in @fontβface src. Check COLRv1, variable, etc.
Style underlines, overlines, and strike-throughs with colors, wavy styles, and thickness. Modern CSS textβdecoration.
Stack multiple background images and blend them with colors. Create unique textures. Copy the CSS code instantly.
Paste plain text and turn it into a nested outline using indent levels or Markdown headings. Great for planning.
Create outlined text with the textβstroke property. Adjust width and color. Preview and copy the CSS.