Productivity & Puzzles
Kanban boards, invoice generators, Sudoku solvers, cellular automata, and the Master Client Hub.
Available Tools in this Suite
7 Utilities CatalogedPomodoro Focus & Task Productivity Timer
Boost productivity with interval focus sessions, animated progress rings, audio chimes, and celebration streaks.
Compound Interest Calculator
Simulate compound interest and exponential wealth accumulation with recurring deposits and customizable interest rates.
Loan & Mortgage Payment Calculator
Calculate monthly mortgage payments, total interest costs, and amortization summaries with customized terms and rates.
Salary to Hourly Converter
Convert annual salary to hourly wage (and vice-versa) factoring in work hours, overtime, and paid time off.
Sales Tax & VAT Calculator
Calculate sales tax, VAT, or reverse-calculate pre-tax amounts from total purchase prices.
Tip & Bill Splitter Calculator
Calculate gratuity tips and split bills evenly among multiple people with customizable tip percentages.
Discount & Sale Price Calculator
Calculate final discount sale prices, stacked coupons, and total money saved on shopping deals.
Productivity & Puzzles Architecture & Specifications
Local runtime benchmarks and security parameters for all Productivity & Puzzles utilities.
Real-World Workflows & Applications
Common technical problems solved with zero server dependencies.
Mortgage & Loan Comparison
Calculate monthly principal and interest payments and total loan lifetime interest across varying interest rates.
Freelance Rate Calculation
Convert annual corporate salary targets into billable hourly rates accounting for taxes, benefits, and billable hour ratios.
Pomodoro Focus Intervals
Execute distraction-free 25-minute sprints with automatic 5-minute break reminders to maintain cognitive stamina.
Core Financial & Productivity Formulas
Standard specifications and quick-lookup reference table.
| Concept | Mathematical Formula | Variables | Practical Application |
|---|---|---|---|
| Compound Interest | A = P(1 + r/n)^(nt) | P=Principal, r=Rate, n=Periods, t=Years | Investment compounding, retirement planning |
| Monthly Mortgage | M = P[i(1+i)^n] / [(1+i)^n - 1] | P=Loan, i=Monthly rate, n=Total months | Home loans, auto financing amortization |
| Hourly Conversion | Hourly = Salary / 2,080 hrs | Based on 40-hr standard working week | Freelancer rate setting, wage comparisons |
| Pomodoro Ratio | 25 min work : 5 min break | Classic Cirillo productivity rhythm | Overcoming procrastination, sustained focus |
| Sales Tax / Markup | Final = Base × (1 + tax_rate) | Direct percentage multiplier | Retail pricing, invoice estimation |