ConvertMaster Pro

100% free, instant unit converter. All 40 categories fully unlocked — live exchange rates, batch conversion, CSV export included. Tips welcome if it serves you well.

onvertMaster is a completely free, ad-free unit converter. Launch and go — no sign-up, no data collection. All 40 categories are permanently free with nothing locked behind a paywall.

Everything Included, No Strings: • 40 categories: Currency (160+ live rates), Length, Area, Volume, Mass, Data Storage, Temperature, Speed, Time, Energy, Power, Pressure, Angle, Force, Torque, Fuel Economy… too many to list • Batch conversion: input multiple values at once • CSV export: send results via email or AirDrop • Custom units: create your own unit combos • History search: find anything you've converted • Smart decimal display, one-tap copy • Dark/Light theme, 20 languages • Works offline (except live rates) • No ads, no tracking, no account needed

If It Helps You— This app doesn't gate features behind payment. If it saves you time, you can buy the developer a coffee. Tipping unlocks nothing — everything is already free.

Perfect For: Students, travelers, cooking, home projects, engineers, international trade

Requirements: iOS 14.0+, iPhone & iPad optimized