I'm a biomedical scientist and IT systems lead at an NHS hospital in Liverpool. My day involves neuroimmunology lab work and managing pathology IT systems — two jobs that need very different tools. I kept switching between apps: one for serial dilutions, another for unit conversions, a website for UUID generation, a calculator for mortgage comparisons. None of them talked to each other, most were full of ads, and half didn't work offline. So I built one app that does all of it. The hardest part wasn't the code — it was scope. What started as "a converter with a few calculators" turned into 17 categories, 60+ calculators, a Periodic Table, 14 developer utilities, and an egg timer (because why not). Some things I'm proud of: - Lab tools built by someone who actually uses them daily — serial dilution, molarity, sensitivity/specificity with PPV and NPV - Every calculator shows the formula, not just the answer - Dev tools that run locally — no data leaves your phone - Dark, Light, and AMOLED themes - Completely offline after install Built solo with React Native / Expo over 3 months of evenings and weekends. Free with an optional £1.99 premium unlock — no subscription, no ads, no tracking. I'd love to know: what calculators or conversions do you reach for most? I'm actively adding features and your suggestions go straight into the next update.

UnitConvert Pro-150+calculators & tools

Every unit. Every calculator. One app.

Every unit. Every calculator. One app.