Proteus Unit Converter - AI

Convert anything into anything — instantly.

Proteus turns your iPhone into the only converter you'll ever need. Length, mass, currency, temperature, cooking measurements, data, fuel, and more — 28 categories and 350+ units in one beautifully simple app. No ads. No clutter. Just answers.


COMPOUND CONVERSIONS — THE WAY YOU ACTUALLY MEASURE

Real life isn't tidy. Proteus understands mixed length and mass units the way you say them:

• Type "5 ft 7 in" and see it in centimeters instantly
• Convert "1 lb 4 oz" to grams without breaking it into steps
• Enter "2 m 30 cm" — Proteus just gets it

No other converter handles compound units this naturally. Stop doing math in your head.


LIVE CURRENCY — ALWAYS UP TO DATE

• 165+ world currencies with country flags
• Exchange rates auto-refresh every few hours
• Pull to refresh anytime for the latest rates
• Works offline — your last rates are cached with a clear "as of" date
• Pin a base currency and watch every other update as you type


ASK PROTEUS — YOUR BUILT-IN AI ASSISTANT

Skip the menus. Just ask.

• "How many tablespoons in 200 ml?"
• "What's 80 mph in km/h?"
• "Convert 450°F to Celsius for my recipe"
• "How many euros is 100 dollars?"

Ask Proteus understands plain language and answers most conversions and calculations instantly on your device. It's like having a measurement expert in your pocket.


VOICE INPUT — HANDS-FREE WHEN YOU NEED IT

Tap the microphone and just say the conversion. Proteus listens, parses your speech in real time, and shows the answer the moment you stop talking. Perfect for the kitchen, the workshop, or on the road. Your recent voice conversions stay in a tidy list so you can scroll back.


EVERY CATEGORY YOU'LL ACTUALLY USE

Length • Mass • Currency • Temperature • Time • Speed • Volume • Area • Pressure • Energy • Power • Force • Angle • Torque • Acceleration • Frequency • Density • Flow rate • Data storage • Data transfer • Typography • Capacitance • Illuminance • Fuel economy • Blood sugar • Number bases • Roman numerals • Fractions


BUILT FOR SPEED

• Convert as you type — no buttons, no waiting
• Every related unit updates at once
• Lightning-fast search by name or abbreviation (type "psi" or "kWh")
• Built-in scientific calculator on every field
• Scientific notation and adjustable precision for serious work


MAKE IT YOURS

• Star your favorites for one-tap access
• Full conversion history, always one tap away
• Hide units you never use, pick your own accent color
• Designed dark-first for a calm, focused feel
• Full VoiceOver and Dynamic Type support


TRY IT FREE

Start with a 7-day free trial — full access to everything, including Ask Proteus. After your trial, unlock the full converter for a one-time $2.49 (no subscription). Want more AI? Add Ask Proteus Pro for $0.59/month.


Download Proteus and convert with confidence.


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Proteus is a one-time $2.49 purchase to unlock the converter after your 7-day free trial — no subscription required. Owning the app includes 10 Ask Proteus AI messages per day.

Ask Proteus Pro is an optional auto-renewing subscription at $0.59/month that lifts the AI assistant to 100 messages/day. Payment is charged to your Apple ID account at confirmation of purchase. Subscription renews automatically unless turned off at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings.

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