Comparison

Conversion Calculator Plus vs SM Calculator

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

Head to head
About

Conversion Calculator Plus

This app is a versatile unit and currency converter with a user-friendly interface. It supports a wide range of conversion categories, including real-world and crypto currencies, with automatic exchange rate updates. Customize your experience with design options, dark mode, and adjustable home screen layouts.

Highlights
  • Unit and currency conversion
  • Supports 160+ currencies (real & crypto)
  • Automatic currency exchange rate updates
  • Simple or carousel design options
  • Dark Mode support
  • Customizable home screen layout
  • Split screen mode on iPad
Features
Read full description

• No full-page ads. • App works without internet. • Rates Saved for Offline use. • Real-time rates updated every minute. • Fast, accurate conversions across 685 units. • Hide unused units, currencies and categories. • Built-in calculator with +, −, ×, ÷, ( and ). • Supports both light and dark appearance. • Custom Home Screen Widgets. Premium Required • Use Siri to convert. Premium Required • Conversions automatically saved to History. • Save all your favorite conversions in 1 place • Interactive rate charts from 1 day to 5 years, plus all available history. • Expand charts to full screen, pinch to zoom, pan and inspect past rates. ----------------------------------------- ALL CONVERSION CATEGORIES COMMON CATEGORIES Pace, Temperature, Data, Currency, Length, Time, Speed, Area, Volume, Pressure, Power, Fuel Economy and Weight. CURRENCIES, CRYPTO & METALS Convert all world currencies, 125 cryptocurrencies and tokens—including Bitcoin, Ethereum and Tether—and four precious metals: gold, silver, platinum and palladium. Compare multiple currencies in one list with Currency+. NUMBERS & GEOMETRY Angle and Amount. PERSONAL & HEALTH Shoe Sizes, Ring Sizes and Blood Sugar. MOTION & MECHANICS Acceleration, Angular Acceleration, Force, Torque, Energy and Moment of Inertia. FLUIDS & MATERIALS Flow, Density, Viscosity, Kinematic Viscosity, Surface Tension, Permeability, Mass Flux Density and Specific Volume. TEMPERATURE & HEAT Temperature Interval, Thermal Conductivity, Specific Heat Capacity, Heat Density, Heat Flux Density, Heat Transfer Coefficient and Thermal Expansion. ELECTRICITY & MAGNETISM Current, Voltage, Charge, Resistance, Capacitance, Inductance, Conductance, Linear Charge Density, Surface Charge Density, Volume Charge Density, Linear Current Density, Surface Current Density, Electric Field Strength, Electric Resistivity, Electric Conductivity, Magnetic Flux (Magnet), Magnetic Field Strength, Magnetic Flux Density and Magnetomotive Force. LIGHT & SOUND Luminance, Illumination, Luminous Intensity, Sound and Frequency. DATA & DESIGN Data Transfer Rate, Image and Typography. CHEMISTRY & RADIATION Molar Concentration, Molar Mass, Molar Flow Rate, Radiation, Radioactivity and Exposure. PREMIUM Premium is an optional auto-renewing annual subscription. It removes banner ads, gives you more screen space, and unlocks interactive Home Screen widgets and Siri conversions. Payment is charged to your Apple Account when you confirm the purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your Apple Account settings. The price is shown before you confirm. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://developer-yl.github.io/convert-units-plus/privacy.html

About

SM Calculator

Easily convert between standard and metric units for calculations. Supports decimal and fraction values in inches, and millimeters. Tap values to see equivalents or add them to a pin list for quick access.

Highlights
  • Cross-unit calculations
  • Decimal and fraction support
  • Metric unit conversion
  • Tap to convert values
  • Pin list for quick access
  • Conversion table
Features
Read full description

This app is designed to aid in cross-unit calculations between Standard and Metric units. With the "Calculator" tool you can execute calculations across standard decimal and fraction values (in inches), as well as metric values (in millimeters). In Addition, you can tap on any value in the "transcript" output to see its equivalent in the alternate unit type/style. If you tap the icon next to a value you can add that value to the "Pins" view, which can be seen by tapping the icon in the lower right portion of the transcript view. With the "Convert" tool you can select one of three input fields (millimeter, standard decimal, or standard fraction) and type in a value to get an instant conversion into the other two unit types. The "Table" tool is a simple table with common measurements converted between metric and standard (decimal & fraction). This app is a work in progress with more features to come! Feedback and feature suggestions are welcome.

Screenshots

Conversion Calculator Plus4 screens
SM Calculator4 screens

Verdict

The call

The clearest difference is in-app purchases: SM Calculator at none against Conversion Calculator Plus's 1. SM Calculator also leads on ads (none vs shown) and rating (5.0 vs 4.7). Conversion Calculator Plus's advantage is ratings volume (15K vs 2). On price, update cadence, device support and iOS requirement 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. Conversion Calculator Plus sells 1 in-app purchase, starting at $9.99 per year. SM Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

SM Calculator holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Conversion Calculator Plus has 15K ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Conversion Calculator Plus ships an update every 2 days, SM Calculator daily. The most recent releases landed on November 8, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
Conversion Calculator Plus versus SM Calculator: the parameters behind the verdict, then further details
ParameterConversion Calculator PlusSM Calculator
PriceFreeFree
Rating4.7 (15K ratings)5.0 (2 ratings) — better
Positive reviews69.5% of reviews—
Number of ratings15K — better2
Update frequencyEvery 2 daysDaily — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad — betteriPhone
Requires iOS17.016.0 — better
Further details — not scored
Size59 MB8 MB
Age rating4+4+
DeveloperAdysseusBody Culture

Customer experience

Conversion Calculator Plus

All ratings15,343 ratings
Positive94.6%
Neutral2.8%
Negative2.6%
Written reviews200 reviews
Positive69.5%
Neutral4.5%
Negative26.0%

SM Calculator

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Conversion Calculator Plus

Reported bugs

3 issues
  • Currency conversion not working
  • App gets stuck on consent page
  • Unable to get past ads/subscription page

Requested features

3 requests
  • Add running pace conversions
  • Add shoe size converter
  • Provide paid ad-free version

SM Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Conversion Calculator Plus

Subscriptions1
  • No Ads For One Year1 Year trial$9.991 Year
None

SM Calculator

No in-app purchases

Questions

Is Conversion Calculator Plus free?
Conversion Calculator Plus is free to download, with in-app purchases available.
Is SM Calculator free?
SM Calculator is free to download, with no in-app purchases.
Which has better reviews, Conversion Calculator Plus or SM Calculator?
SM Calculator is rated higher. Conversion Calculator Plus averages 4.7 out of 5 from 15K ratings, while SM Calculator averages 5.0 from 2 ratings.
Do Conversion Calculator Plus or SM Calculator have ads?
Conversion Calculator Plus shows ads; SM Calculator does not.
Which is updated more often, Conversion Calculator Plus or SM Calculator?
Conversion Calculator Plus ships an update every 2 days, and SM Calculator daily. Most recently, Conversion Calculator Plus was updated on November 8, 2026 and SM Calculator on November 3, 2026.

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