Finance
Calculate if refinancing your loan will save you money
refinance-calculatorFinance
Calculate present value of future cash flows and investment analysis
present-valueGenerator
Randomly group input data into specified number of groups with flexible options
random-group-generatorUtilities
Find rhyming words with AI-powered analysis and pattern matching
rhyme-finderDesign
Convert RGB color values to HEX format for web design
rgb-to-hex-converterDesign
Convert RGB color values to HSL for screen display
rgb-to-hsl-converterDesign
Convert RGB color values to HSV/HSB for color manipulation
rgb-to-hsv-converterMath & Numbers
Convert US liquid pints to liters with configurable decimal precision
pint-to-literDesign
Draw boxes and constrained lines toward a movable vanishing point; learn in steps and download PNG or SVG locally.
perspective-drawing-practice-boardFinance
Simulate 30 years of net worth with seeded Monte Carlo: 2026 US tax brackets, FICA, 401(k) match utilization, Roth conversion ladder, buy-vs-rent break-even and refinance math — no signup, nothing leaves your browser session.
personal-finance-what-if-simulator-no-account-required-tax-loan-rent-savingsHealth
Overlay one-compartment IV bolus, intermittent short-infusion and continuous-infusion concentration curves at the same daily dose: accumulation ratio, steady-state Cmax/Cmin, AUC per interval, time to steady state, peak:trough fluctuation and loading doses.
pharmacokinetic-bolus-vs-infusion-overlap-tutorText Processing
Look up any Chinese character or phrase in the Ping Shui Yun (平水韵, 106 rhyme groups, Song dynasty) and Ci Lin Zheng Yun (词林正韵, 19 parts, Qing dynasty) rhyme books: tone class (平/上/去/入), pingze (平/仄) pattern, and cross-system mapping. Reverse lookup lists every character of a rhyme group and checks whether a set of characters can rhyme together, with canonical poem rhyme-foot examples from Li Bai, Du Fu, Su Shi, Li Qingzhao and Yue Fei.
ping-shui-yun-ci-lin-zheng-yun-classical-chinese-poetry-rhyme-index