Ovulation & Fertility Window Calculator - Online Cycle Tracker
Estimate ovulation day and fertility window from last menstrual period. Displays probable conception dates. Informational only; processes locally in browser.
UD5 Toolkit
Track days until your birthday, wedding, vacation, or any special event. Never miss a moment that matters.
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Estimate ovulation day and fertility window from last menstrual period. Displays probable conception dates. Informational only; processes locally in browser.
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Track days of sobriety with a motivational counter and milestone celebrations. Set quit date and see time elapsed in days, hours, minutes. Private & local.
Answer questions and see typical milestones for 0-5 years. Educational reference for parents. Not a diagnostic tool.
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Tap a glass icon each time you drink a cup of water. See your daily intake. Reminders optional. Local storage.
Timer to remind you to limit shower water exposure even with a cast cover. Keep your cast dry.
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Measure your visual and auditory reaction speed. Average and best times shown. No data collected. Pure Javascript timing.
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Generate CUIDs that are optimized for horizontal scaling and collision resistance. Great for client‑side IDs. Pure JavaScript.
Fill in your details and generate a professional‑looking invoice ready to print or save as PDF. No sign‑up, all data stays on your device.
Simple tracker to record potty attempts, successes, accidents. See patterns. Data stays local. Aids in toilet training journey.
Record audio directly from your microphone and download it as a WAV file. Perfect for quick notes. No upload, fully offline support.
Click for a warm, encouraging sentence to lift your spirits or support a friend. Small positive boost. No repeats.
Start a 10‑15 minute guided laser chase session that ends with the dot landing on a treat, preventing frustration from never catching the prey.
See a comprehensive table of which modern web APIs your current browser supports. Includes WebGPU, AVIF, and more.
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Use your microphone to dictate text and see it appear live. Also upload an audio file for basic transcription. All local.
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Test your browser's built‑in speech recognition. Speak and see the transcribed text appear live. Must‑have for voice app devs.
Get a short, thought‑provoking insight or proverb. A moment of reflection. Works offline.
Hear a word spoken by browser TTS and type the spelling. Choose difficulty or paste your own list. Great for kids. Local only.
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Convert pixel values to em and rem units based on a base font size. Bidirectional. Must‑have for front‑end developers.
Build a properly formatted robots.txt file with user-agent rules and sitemap location. Validate syntax in real time. Essential for webmasters.
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