Comparison

Proteus Unit Converter vs SpaceSnug

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Proteus Unit Converter

This app offers instant conversions for over 350 units across 28 categories, including compound measurements and live currency exchange rates. It features an AI assistant for natural language queries and voice input for hands-free operation.

Highlights
  • Compound unit conversions
  • Live currency exchange rates
  • AI assistant for natural language queries
  • Voice input for hands-free conversions
  • Extensive unit categories
  • Customizable interface
Features
Read full description

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. ——— 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. Terms of Use: https://www.kkbcori.com/proteus/terms Privacy Policy: https://www.kkbcori.com/proteus/privacy

About

SpaceSnug

Features
Read full description

Standing in a store eyeing a couch, wondering if it'll ever make it through your front door? Moving day, and the wardrobe is stuck halfway up the stairs? SpaceSnug answers the one question that matters: will it fit? Check it before you buy it, before you carry it, before you get stuck. TWO WAYS TO MEASURE - Scan it in 3D. Point your iPhone or iPad Pro at the object, then at the doorway, hallway or stairwell — LiDAR does the measuring for you. Fast and accurate. - Or type it in. Enter the width, height and depth by hand on any device. Free, no scan needed. A CLEAR ANSWER - Fits, Tight, or Doesn't fit. No guessing. - SpaceSnug names the limiting dimension, so you know exactly what's in the way. - Handling tips show you how to carry it: turn it on its side, tilt it back, or rotate it through. IT KNOWS THE WHOLE ROUTE - Narrow hallways, tight corners, stairwells and landings — SpaceSnug accounts for the turns along the way, not just a single opening. So you find out before the heavy lifting, not during it. ROOM MODE - Scan a room and drop items inside to see whether, and where, they actually fit. Plan the layout before you move a thing. EVERYTHING SAVED - Every check and scan lands in your library — come back to it in the store, at home, or on moving day. PRIVATE BY DESIGN - Your scans stay on your device. FREE TO START - Entering dimensions by hand and running fit checks is free. In-app "Fits" power the LiDAR scans when you want the phone to do the measuring. Moving house, buying a sofa, fridge or wardrobe, or rearranging a room — measure once, carry once. Know it fits before you lift it. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Service Terms: https://spacesnug.com/terms

Screenshots

Proteus Unit Converter4 screens
SpaceSnug4 screens

Verdict

The call

The clearest difference is iOS requirement: Proteus Unit Converter at 17.0 against SpaceSnug's 26.2. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Proteus Unit Converter sells 1 one-off in-app purchase and SpaceSnug sells 6 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 9 level
Proteus Unit Converter versus SpaceSnug: the parameters behind the verdict, then further details
ParameterProteus Unit ConverterSpaceSnug
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 6 days—
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS17.0 — better26.2
Further details — not scored
Size9 MB242 MB
Age rating4+4+
DeveloperKKB CoRi Technologies Private LimitedLuca Hoehlein

In-app purchases

1 purchases

Proteus Unit Converter

One-time1
  • Proteus Full Access$2.49
6 purchases

SpaceSnug

Subscriptions3
  • 10 Fits / Month$4.991 Month
  • 25 Fits / Month$7.991 Month
  • 120 Fits / Year$39.991 Year
One-time3
  • 1 Fit$1.99
  • 3 Fits$2.99
  • 9 Fits$5.99

Questions

Is Proteus Unit Converter free?
Proteus Unit Converter is free to download, with in-app purchases available.
Is SpaceSnug free?
SpaceSnug is free to download, with in-app purchases available.
Do Proteus Unit Converter or SpaceSnug have ads?
Neither Proteus Unit Converter nor SpaceSnug shows ads.

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