I Smart MeasureI Smart Measure Open the converter →

Online unit converter vs app: which is better?

A web converter is instant; a native app works offline. You used to have to choose. Here is how they compare — and why you no longer have to pick one.

Online converter

Instant — nothing to install
Works on any device with a browser
Always the latest version
Usually needs a connection
No home-screen icon

Downloaded app

Works offline
Home-screen icon, app-like feel
Takes storage and an app-store install
Needs updating
Often gated behind sign-up or ads

You do not have to choose

I Smart Measure is a Progressive Web App (PWA) — it opens instantly in your browser like a website, and can be installed to your home screen for offline, app-like use. No app store, no sign-up, no ads. It caches itself after the first visit, so conversions keep working with no connection.

Instant in the browser · Installable & offline · No ads or account
Get the best of bothOpen I Smart Measure →

Popular conversions

cm → inkg → lbmi → km°C → °FBest free converterAll conversions

FAQ

Is an online converter or an app better?

An online converter is instant with nothing to install; an app works offline and feels native. I Smart Measure is a Progressive Web App, so you get both — use it in the browser, or install it for offline, app-like use.

Do I need to download anything to convert units?

No. I Smart Measure runs instantly in your browser with no download. You can optionally install it as a PWA for offline use and a home-screen icon.

Does an online converter work offline?

A plain web page usually needs a connection, but I Smart Measure caches itself after the first visit and keeps working offline like an installed app.