Loans, savings, pricing and returns. Each of these shows its working rather than handing back a single number, because the reasoning is what actually changes a decision.
Monthly repayments and total interest, broken down
See how savings grow with regular contributions
Every percentage question, answered four ways
Sale prices, savings and stacked discounts
Price correctly by converting between the two
How many units you must sell to cover costs
Return on investment, absolute and annualised
More sets
Everything that works without an API
The ten tools people reach for most
Daily utilities that never phone home
Write, check, optimise and publish
