Toolcore expanded with geometry helpers, personal-finance calculators, readability indices, binary and float encoding utilities, business-day date math, and a handful of URL or semver parsers. You do not need to memorize every slug—start from the job below.
Geometry and distance
Homework, CAD sketches, and “how far is that?” questions share the same pattern: three numbers in, one answer out.
- Square area, Heron triangle, arc length, ellipse area — classic plane formulas.
- Law of cosines and law of sines — paste side/angle labels when a diagram is ambiguous.
- Haversine distance — great-circle km between two lat/long pairs.
Loans, interest, and net worth
- Compound daily / quarterly, future value, present value — standard time-value formulas.
- Car loan, student loan, annuity payment — monthly payment estimates.
- Debt snowball and debt avalanche — compare payoff strategies from pasted balances.
- Real return, CPI adjust, salary inflation — inflation-adjusted what-ifs.
Readability and text metrics
You trimmed a blog post three times and still wonder if it reads easier. Paste the prose into one index page—compare scores across drafts, not against a legal standard.
- Flesch reading ease, Gunning Fog, SMOG, ARI, Coleman-Liau.
- Scrabble score, syllable count, keyword density, average sentence length.
- Classic ciphers for puzzles and teaching: Beaufort, autokey, Hill 2×2, bifid, trifid.
Floats, CRC, and binary ops
- IEEE-754 decode / encode — hex ↔ decimal floats from debuggers.
- CRC-16, Fletcher-16, binary AND/OR/XOR.
- HTML entity encode/decode, form URL encode, data URI encode.
Business days, cron, URLs
- Business days between, add business days, add weeks, subtract months, age from birth date.
- Cron next run and ISO duration to human text.
- URL normalize, URL build from parts, semver coerce, CIDR overlap check.
Finding the rest
This batch added many more number-theory and text-toy pages (primes, Lucas/Padovan, alternating case, and others). Use navbar search with the word you already have—prime, bell, entropy—or filter Browse tools by Math or Writing. For time-zone habits that pair with date math, see schedule tools for logs and deadlines.