UD5 Toolkit
Ohm's Law Calculator - Online Voltage Current Resistance Power
Enter any two values (voltage, current, resistance, power) and compute the others. Visual triangle helper and formula display. Instant local calculation.
Advanced Online Scientific Calculator - History & Memory
M
DEG
History
No calculations yet
Number Memory Trainer - Online Recall Digits
A sequence of digits flashes for a few seconds. Type it back. Increase length. Improve your working memory.
Random History Fact Generator - Online On This Day
Get a random history fact or see what major events happened on this day. Curated from public domain sources. Local.
Voltage Divider Calculator - Online Electronics Resistor Tool
Calculate the output voltage and resistor values for a voltage divider circuit. Includes schematic. Handy for electronics hobbyists and engineers.
On This Day Trivia Generator – Online Historical Events
Shows a random historical event that occurred on today's date. Fun daily knowledge snippet.
D&D Magic Item Price Calculator – Online by Rarity & Edition
Select item rarity and consumable state to get a price range based on Dungeon Master's Guide tables. Quick reference.
Meeting Cost Calculator - Online Time & Money Waster
Calculate the real monetary cost of a meeting by attendees' hourly rates. A humorous yet insightful productivity tool. All local calculation.
Currency Exchange Fee Calculator - Online Hidden Cost Revealer
Compare the real cost of currency exchange including hidden mark-ups and service fees. See how much you lose per transaction. Local educational tool.
Trip Budget Calculator - Online Estimate Travel Costs by Category
Plan your travel budget by entering flights, accommodation, meals, activities, transport. See cost breakdown and per-person share. Fully local.
Friendship Bracelet Thread Length Calculator – Online by Pattern
Select bracelet type (chevron, candy stripe) and enter rows to estimate total embroidery floss needed per color. Reduce waste.
HTTP Headers Reference - Online Search & Descriptions
Browse a searchable list of standard HTTP request and response headers with explanations. Quick dev help.
Units of Measurement Reference - Online Quick Guide
Search and browse a comprehensive table of SI units and common imperial conversions. For students and engineers.
Cursive Typing Practice – Online Fun Script Keyboard Input
Type a passage and see it appear in a realistic cursive font. Helps connect handwriting to digital text.
HTTP Status Code Reference - Online Search & Meanings
Look up any HTTP status code and see its meaning, RFC reference, and example. Full offline reference.
World Clock - Online Current Time Across Cities
Display current time for multiple cities worldwide. Add and remove locations. See day/night indicator. Lightweight and always accurate.
Water Intake Tracker - Online Daily Hydration Logger
Log your daily water consumption with one click. Set a goal and track progress. Data stored locally for privacy. Simple and clean interface.
Simple Tax Credit Checker - Online Estimate GST/HST & Climate
Quick eligibility estimator for Canadian GST/HST credit and climate action incentive based on income and family size. For informational purpose only.
HTTP Status Codes Reference - Online Quick Cheat Sheet
A complete reference of HTTP status codes with explanations. Search and filter by code or category. Useful for API developers and web debugging. Static and fast.
Crossword Solver - Online Find Words by Pattern ?a?e
Enter word pattern with ? for unknown letters and known letters to find matching dictionary words. Essential crossword help. Local dictionary.
Fish Quarantine Countdown – Online New Arrival Observation
Set a date when a new fish arrives and get a daily checklist for observation. Countdown to safe introduction.
Bill Splitter with Tip & Tax - Online Shared Expense Divider
Enter total bill, tip %, tax amount, and number of people. Instantly see what each person owes. Handles uneven splits too. No data saved.
Minimum Time Zone Clock - Online World Time at a Glance
See current time in multiple pre-selected cities simultaneously with day/night indicators. No tracking, just a simple multi-clock.
Receipt & Expense Logger - Online Simple Finance
Snap or type expense details and store them locally. Categorize and see monthly totals. No cloud, no sign‑up.
Etymology Quick Lookup - Online Word Origin Reference
Enter an English word to get a brief etymology (Latin, Greek, etc.) and root meaning. From curated static data.
UV Index Reference - Online Exposure Category & Protection
See the current UV index forecast or enter a value to learn protection needed (SPF, hat, shade). Educational.
Treasure Hunt Clue Maker – Online Create Rhyming Clues
Enter hiding places and get a set of rhyming clues to print. Fun for kids' parties.
Global Meeting Time Finder - Online Multi‑Zone Overlap Tool
Select cities and see a 24-hour grid highlighting compatible meeting times. Drag to find a slot that works for everyone. Daylight saving aware.
Meditation Chime Timer - Online Mindfulness Bell
Set a meditation duration with optional interval chimes. Soothing bell sounds at the start and end. No ads.
Parts‑of‑Speech Tagger - Online Text Analyzer
Paste a sentence and see each word tagged with its part of speech (noun, verb, adjective). Local rule‑based analysis.
Braille Alphabet Trainer - Online Learn Dot Patterns
Flashcards for learning Braille. See the dot pattern and type the letter. Track your speed and accuracy. Accessibility education.