The builder’s shelf

Small apps.
Useful possibilities.

Tools for everyday tasks and ideas worth exploring. Try an app, see what it does, and read the thinking behind it.

Everyday tools

Calculator

Everyday arithmetic with keyboard controls and an in-session calculation history.

Planning tools

Explore retirement scenarios by changing savings, contribution and planning assumptions.

Investment tools

Track mutual funds and SIPs, calculate XIRR, and compare your investments with selected benchmarks.

Good tools start with a clear problem. I write about scope, assumptions and what makes a small app useful.