Interest & Loan
Reckonersweight 1reckoner · computes, doesn't store
The loan brochure is cheerful, the rate looks small, and the total over twenty years is a number they printed in a lighter grey. Interest & Loan does the honest arithmetic — what a rate compounds into, what a loan really costs over its life. It computes the figures in front of you and keeps none of them, so you can wonder about money in complete privacy.
This is not a screenshot. It's the real tool, running right here — go on, put something in it.
Open the demo full-screen: /demos/interest-loan.html
Questions people ask
Can I check my finances in this without them being stored anywhere?
That is the whole design. It is one HTML file running offline in your browser; it computes your numbers on the spot and stores nothing. No account, no cloud, and your what-ifs never leave the page.
How do I see what a loan will really cost me?
Enter the amount, the rate, and the term, and it works out what the borrowing adds up to. Seeing the full figure before you sign is the entire point of the exercise.
Can it show me how savings grow with compound interest?
Yes — give it a starting sum, a rate, and time, and it shows you what compounding does. It is the same arithmetic banks use, minus the marketing.
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