Comparison

Conversion Calculator Plus vs OneCalc+ All

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

OneCalc+ All

This premium calculator app offers over 40 tools for finance, everyday math, health, construction, and unit conversions. It includes standard, scientific, financial, and specialized calculators, all without ads.

Highlights
  • Over 40 calculators and unit converters
  • Standard and scientific calculator modes
  • Financial calculators (interest, loans)
  • Unit and currency converter
  • Health (BMI, calorie) calculators
  • Construction estimation tools
  • Fraction and percentage calculations
Features
Read full description

This is the premium (ad-free) version of "All-in-one calculator" app for iOS. All-in-one calculator is a must have calculator app for your iPhone and iPad. It features over 40 calculators and unit converters for everyday use, grouped under finance, everyday math, health, construction, date & time, unit converters, and shopping/ retail. Simple yet powerful, the following features are built into this all-in-one calculator:- STANDARD CALCULATOR • Includes percent key, negative sign, brackets and history viewer. • Advanced mode includes memory keys and functions for trigonometry, roots, exponents and logarithm found in scientific calculators. UNIT CONVERTER • Supports temperature, length, weight, area, volume and many more measurement units. • Currency converter. FINANCIAL CALCULATOR • Interest calculators using simple and compound interest • Loan repayment and amortization schedule. • Savings calculator with financial goal planner FRACTIONS/ PERCENTAGE CALCULATOR • Calculators for 3-way percentage, discount pricing, profit margin, tax, tip & split bill. • Add, subtract, multiply, divide fractions HEALTH • BMI and calorie calculators to help you keep track of your body weight. CONSTRUCTION CALCULATOR • Calculators to estimate cement, sand, gravel quantities for concrete blocks, wall plastering and brick works. • Area and volume calculator for common geometric shapes. • Irregular land area calculator • Solve height and distance problems using right-triangle calculator. LIFESTYLE • Age and date calculator Need to know what you are paying for? Try out the free version of this calculator app from the developer profile.

Screenshots

Conversion Calculator Plus4 screens
OneCalc+ All4 screens

Verdict

The call

The clearest difference is price: Conversion Calculator Plus at Free against OneCalc+ All's $3.99. Conversion Calculator Plus also leads on update cadence (every 2 days vs every 3 months) and ratings volume (15K vs 522). OneCalc+ All's advantage is in-app purchases (none vs 1) and ads (none vs shown). On rating, review sentiment 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

Conversion Calculator Plus is free to download; OneCalc+ All costs $3.99 up front. Conversion Calculator Plus sells 1 in-app purchase, starting at $9.99 per year. OneCalc+ All asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Conversion Calculator Plus against 4.7 for OneCalc+ All. That said, the two scores are not equally well evidenced: Conversion Calculator Plus has 15K ratings behind it against 522, so its average is the more settled of the two. Written reviews are what separate them: 70% of Conversion Calculator Plus's written reviews are positive against 75% of OneCalc+ All's.

UpkeepUpdate frequency

Conversion Calculator Plus ships an update every 2 days, OneCalc+ All every 3 months. The most recent releases landed on November 4, 2026 and November 2, 2026 respectively.

Scorecard7 real differences · 3 level
Conversion Calculator Plus versus OneCalc+ All: the parameters behind the verdict, then further details
ParameterConversion Calculator PlusOneCalc+ All
PriceFree — better$3.99
Rating4.7 (15K ratings) — better4.7 (522 ratings)
Positive reviews69.5% of reviews74.8% of reviews — better
Number of ratings15K — better522
Update frequencyEvery 2 days — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.6 — better
Further details — not scored
Size59 MB3 MB
Age rating4+4+
DeveloperAdysseustasser gyati

Customer experience

Conversion Calculator Plus

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

OneCalc+ All

All ratings512 ratings
Positive93.0%
Neutral3.9%
Negative3.1%
Written reviews107 reviews
Positive74.8%
Neutral10.3%
Negative15.0%

User reviews

Conversion Calculator Plus

From 15K App Store ratings

What we love

  • 🚀 Great app
  • 👍 Easy to use
  • 🚀 Comprehensive conversions
  • 👍 Intuitive interface
  • 🚀 Useful tool

Room to improve

  • 🐛 Consent required for tracking
  • 🐛 Update problems
  • 🐛 Currency not updating
  • 🔒 Forced to allow tracking
  • 🔒 Forced to subscribe or view ads

OneCalc+ All

From 522 App Store ratings

What we love

  • 🚀 Comprehensive features
  • 👍 Easy to use
  • 🔒 No ads or tracking
  • 💡 Useful unit conversions
  • 🚀 Smooth performance

Room to improve

  • 🐛 Ads still appear despite paid version
  • 👎 Underlined buttons are distracting
  • 🐛 Currency converter not up-to-date
  • 👎 Lack of customization options
  • 🐛 Calculation errors in complex operations

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

OneCalc+ All

Reported bugs

3 issues
  • History not clearing properly
  • Paid version still showing ads
  • Keyboard not working on Mac devices

Requested features

6 requests
  • Add more themes and color options
  • Implement a swap button for currency converter
  • Allow manual ordering of favorites list
  • Add a widget for quick access
  • Include time calculation functionality
Show 1 more
  • Support for Bluetooth keyboard input

In-app purchases

1 purchases

Conversion Calculator Plus

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

OneCalc+ All

No in-app purchases

Questions

Is Conversion Calculator Plus free?
Conversion Calculator Plus is free to download, with in-app purchases available.
Is OneCalc+ All free?
OneCalc+ All costs $3.99, with no in-app purchases.
Which has better reviews, Conversion Calculator Plus or OneCalc+ All?
Conversion Calculator Plus is rated higher. Conversion Calculator Plus averages 4.7 out of 5 from 15K ratings, while OneCalc+ All averages 4.7 from 522 ratings.
Do Conversion Calculator Plus or OneCalc+ All have ads?
Conversion Calculator Plus shows ads; OneCalc+ All does not.
Which is updated more often, Conversion Calculator Plus or OneCalc+ All?
Conversion Calculator Plus ships an update every 2 days, and OneCalc+ All every 3 months. Most recently, Conversion Calculator Plus was updated on November 4, 2026 and OneCalc+ All on November 2, 2026.

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