Apps

Small, practical web applications by Iago Pinal-Fernandez.

Tools and experiments

Practical apps, built for the web

This is a growing collection of focused tools. Each app opens on its own page and runs directly in your browser.

Estimate investment growth with recurring contributions and review balance milestones over time.

Estimate monthly housing costs, total interest, and the remaining loan balance over time.

Write and edit formulas with scientific functions, constants, memory, angle modes, and calculation history.

Organize categorized tasks privately in your browser, then back them up or restore them with a readable Markdown file.

Alternate focused work with restorative breaks using customizable durations, rounds, sounds, and automatic transitions.

Type two major cities or regions to compare their live time, date, and UTC offset.

Browse month, week, and hourly day views with common holidays, then print a clean planning page.

Practice a randomly selected short passage, then review your speed, accuracy, errors, and completion time.

Shape a shifting spectrum with nine compact shards, chain band clears, complete color cycles, and master a wider field.

Guide a vividly illustrated roadrunner through an ever-faster desert, leaping rocks and ducking beneath canyon hawks.

More apps will be added here as they are created.