Jet Lag Planner - Online Light Exposure Schedule by Zones
Based on home and destination time zones, suggests a light exposure/avoidance schedule to reduce jet lag. Educational tool, local only.
UD5 Toolkit
Based on home and destination time zones, suggests a light exposure/avoidance schedule to reduce jet lag. Educational tool, local only.
Load an SRT file and shift all timestamps forward or backward by milliseconds or seconds. Fix out-of-sync subtitles instantly. Download corrected file.
Start from a base color and use `oklch(from color l c h)` to create lighter or darker variants. Copy the code.
Design a realistic neon sign text with multiple layers of glow. Copy the CSS and HTML. Perfect for headers.
View a series of digital Ishiharaâstyle plates. Not a diagnostic tool, just educational. Read numbers.
Toggle between light and dark mode for a demo page. See how to use the media query. Copy the pattern.
Use CSS masks and fixed backgrounds to create a unique parallax reveal effect. Copy the code. No JavaScript.
Apply East Asian glyph variants like jis78, proportional-width, ruby. See the difference instantly. For CJK typography.
Manually manage flashcards with 5 virtual Leitner boxes. See when to review each box next. All data local storage.
Visualize how caffeine decays in your body over time. Enter intake amount and see remaining caffeine at bedtime to optimize sleep. Uses standard 5-hour half-life.
Apply contentâvisibility: auto to offâscreen sections and see the rendering cost drop. Demos for infinite scroll optimization.
See how a full paragraph looks with your chosen text and background colors. Not just a ratio; the real appearance.
Fullâscreen random colour changes at a slow pace. Use it as a dynamic background for meditation or focus.
Load an animated GIF and adjust its frame delay to make it slower or faster. Download the modified GIF. All local.
Turn any photo into a beautiful kaleidoscope pattern by reflecting and rotating segments. Adjust parameters.
Stack multiple background images and blend them with colors. Create unique textures. Copy the CSS code instantly.
Paste HTML and detect elements with ariaâhidden='true' that contain focusable children. An easy a11y win to fix.
Animate text that looks like it's being decoded or scrambled before settling on the final word. Copy the JS snippet.
Split a secret string into N shares where K are needed to recover. Educational cryptography demo. Uses simple XOR-based scheme. Local.
Drag and drop light sources, camera, and subject to plan a photo shoot. Export diagram as image. Simple and visual.
Define a set of colors for light and dark themes. Get the CSS custom properties snippet. Toggle live.
Check English spelling and get suggestions using the browser's built-in dictionary. Highlight errors instantly. No data leaves your machine.
Test overscrollâbehavior: contain to prevent background scroll or pullâtoârefresh. See the effect in a live demo.
Simulate forcedâcolors mode and see how your site looks. Adjust CSS system colors. Make your design accessible.
Enter a URL and see a waterfall of external scripts with their download size and execution time estimate. Identify performance culprits.
Paste two versions of the same idea and see a wordâlevel diff highlighting the rewrite. Not AI, just diff.
Compare all CSS easing presets side by side on a bouncing ball. See which curve fits your UI animation.
Create a repeating text pattern from a short string for watermarking documents or images. Download SVG pattern.
Create glowing, neonâstyle text effects with multiple textâshadows. Adjust colors and intensity. Copy the CSS.
Enter a URL and extract tabâindex order violations and focusable elements. Quick accessibility audit. Clientâside fetch.