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Three tools picked from the full collection each time you open this page.
Ski & Snowboard Size Guide
Narrow a starting ski or snowboard length range using height, weight, ability, and preferred riding.
Space Area & Price Calculator
Add room measurements or convert a known area, then compare prices per square metre and pyeong.
Household Parking Rights Allocator
How much extra-car demand could fit after assigning one space to each car-owning household?
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100 tools · A–Z
Age Calculator
Enter birth and reference dates to see age on that date and the countdown to the next birthday.
AIAI Blog Prompt Generator
Build a blog-writing brief around a topic, a reader, and facts you have checked. Include the structure you want from titles through tags.
AIAI Code Review & Error Analysis Prompt Generator
Collect the environment, expected behavior, symptoms, and constraints an AI needs to help review code.
AIAI Image Prompt Generator
Describe the subject, framing, light, and colors of a scene, then combine them into an image-generation prompt.
AIAI Meeting & Document Summary Prompt Generator
Build a summary request around your meeting notes or document, with a clear reader, objective, and accuracy rules.
AIAI Prompt Checker
See whether your prompt signals a goal, background, audience, and output format, with suggestions for missing details.
AIAI Prompt Generator
Turn a goal, its background, and the answer you need into one copyable AI request.
AIAI Token & Document Splitter
Estimate the size of a long document and divide it into copyable chunks, leaving room for the reply and overlapping context.
Calculators & FinanceAll-in-One Unit Converter
Enter one measurement to see its equivalents in several units of the same type.
Calculators & FinanceAmount in Words Converter
Write a whole-number amount in words and compare it with the numeric amount before copying it into a document.
GolfAnnual Golf Cost Calculator
What does a golf year cost once practice, equipment, and lessons join the green fees? Build a budget from your own share.
ApartmentApartment Extra-Vehicle Fee Policy Comparator
Compare two extra-vehicle fee proposals using the same household distribution.
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PRACTICAL GUIDES
Methods and worked examples
How to Compare Apartment Extra-Vehicle Parking Fee Policies
Compare monthly household burden and estimated property revenue for two-, three-, and four-plus-car tiers.
Read guide →4 min readHow to Allocate Base Apartment Parking Rights and Extra-Vehicle Capacity
Assign one base space to car-owning households, then calculate remaining spaces and extra-vehicle capacity.
Read guide →3 min readHow to Calculate Actual Work Hours from Start, End, and Break Times
Subtract breaks from elapsed time and estimate weekly or monthly accumulated hours.
Read guide →