Comparison

SmartLabel vs ChangeUnits2

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

Head to head
About

SmartLabel

Access detailed product information for food, beverages, household goods, pet care, and personal care items. Scan barcodes or search for products to find ingredient definitions, sourcing practices, certifications, and more.

Highlights
  • Scan product UPC codes
  • Scan SmartLabel QR codes
  • Search specific products
  • View ingredient definitions
  • Access sourcing practices
  • Discover third-party certifications
  • Find sustainability information
Read full description

Ever find yourself wondering about what goes into the products you use and consume on a daily basis? SmartLabel gives you access to this information whether you’re interested in food, beverage, household, pet care or personal care products, Smart Label has the information you’re looking for no matter where you are, right at your finger tips. Using this app, you can either search a specific product using the Product Search function or scan a product’s UPC code or SmartLabel QR code on the package. Either approach will take you to a variety of information, including: • ingredient definitions • sourcing practices • third-party certifications • social compliance and sustainability programs • usage instructions • advisories & safe handling instructions • genetically engineered ingredient disclosure • company/brand information • And much, much more… Visit www.smartlabel.org for more information. SmartLabel now supports DWCode by GS1 and Digimarc Barcode. For Digimarc end-user license agreement (EULA) visit https://www.digimarc.com/m/eula

About

ChangeUnits2

This powerful utility app offers lightning-fast and accurate unit conversions for a wide range of needs. It includes advanced math functions, currency exchange, time zone tracking, and even chemical equation balancing. Designed for professionals and everyday users alike, it works offline and remembers your last calculations.

Highlights
  • Extreme speed and accuracy
  • Offline functionality
  • Currency exchange converter
  • Global time zone tracking
  • Advanced math functions
  • Chemical equation balancing
  • Last 33 calculations remembered
Features
Read full description

Designed by an Engineer from the Semiconductor Industry, ChangeUnits2 is Built for Extreme Speed and Versatility. ChangeUnits2 is Very Fast. ChangeUnits2 is Very Accurate. ChangeUnits2 Fits inside your Pocket and Doesn't Require a Signal. ChangeUnits2 even Knows what Time it will be HERE (in your Current Location) at 7am in Tokyo. ChangeUnits2 is Built for EVERYONE. It has a Button for virtually ANY Unit and is Very Easy to Use. Tap on the Woman Welder on the Right to Launch the Quick Unit Selection Screen. Toggle the "Longform List" / "Engineering List" button to Switch Between 1) a List of Unit Buttons in Shortform Engineering style, or 2) in Longform style for a more Wordy Description. note: this ALSO toggles between Scientific Notation & Standard Decimal Form. Quickly change between Thermal Units of BTUs / Therms / Kwh / kCals / and even Gallons of Gasoline Need even more Significant Figures? Just add Zero's to the end of the number you entered, press "Convert Units" and ChangeUnits2 will do the rest. Use the built in Currency Converter travelCash, travelCash2, travelCash3 and travelCash4 to Easily VISUALIZE ANY Monetary Exchange Rate. Whether the Exchange Rate is in [Dollars : Donuts] or [Donuts : Dollars]....ChangeUnits2 handles it like a Pro! Effortlessly Calculate the Number of Pints of Beer held in a 1/2 Barrel Keg for your Big Football Party. Converting Between Standard and Metric has never been so Easy!! Easily keep track of the Time in Major Cities while you are ANYWHERE in the World!! No signal needed. Use the Globe Buttons to arrange International Meetings.....based on your Preferred Time....or even Theirs. Schedule a meeting at 7am Tokyo time, or 7am Los Angeles time. ConvertUnits2 will help you keep track of time like a Pro. Perform advanced math functions right in the App. It's so easy and convenient! Even exponents, Ln, Log, Prime Numbers and Square Roots. Balance Chemical Equations from ANYWHERE! Now you can bring your Periodic Table of the Elements with You! Thank you, Uncle Sam! Calculate the Minimum Fall Time / Maximum Energies / Maximum Speeds of a Fall from nearly ANY Height. Now you're the real life McGuber! The "Last Values" button Remembers your Last 33 Calculations using "Convert Units" Now you can show Data you compiled right on your iPhone without re-entering the Information. It's so Easy ChangeUnits2 will Change your Life for the Better It's a Science & Engineering Professional's Dream!

Screenshots

SmartLabel2 screens
ChangeUnits24 screens

Verdict

The call

The clearest difference is price: SmartLabel at Free against ChangeUnits2's $0.99. SmartLabel also leads on ratings volume (97 vs 1) and iOS requirement (11.0 vs 15.6). ChangeUnits2's advantage is rating (5.0 vs 2.2) and update cadence (every 4 weeks vs every 3 months). On 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

SmartLabel is free to download; ChangeUnits2 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

ChangeUnits2 holds the better App Store score, 5.0 against 2.2. That said, the two scores are not equally well evidenced: SmartLabel has 97 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

SmartLabel ships an update every 3 months, ChangeUnits2 every 4 weeks. The most recent releases landed on June 11, 2026 and June 1, 2026 respectively.

Scorecard6 real differences · 4 level
SmartLabel versus ChangeUnits2: the parameters behind the verdict, then further details
ParameterSmartLabelChangeUnits2
PriceFree — better$0.99
Rating2.2 (97 ratings)5.0 (1 ratings) — better
Positive reviews11.3% of reviews—
Number of ratings97 — better1
Update frequencyEvery 3 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.6
Further details — not scored
Size23 MB17 MB
Age rating4+4+
DeveloperConsumer Brands AssociationJack McCormack

Customer experience

SmartLabel

All ratings97 ratings
Positive29.9%
Neutral3.1%
Negative67.0%
Written reviews53 reviews
Positive11.3%
Neutral3.8%
Negative84.9%

ChangeUnits2

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SmartLabel

No in-app purchases

None

ChangeUnits2

No in-app purchases

Questions

Is SmartLabel free?
SmartLabel is free to download, with no in-app purchases.
Is ChangeUnits2 free?
ChangeUnits2 costs $0.99, with no in-app purchases.
Which has better reviews, SmartLabel or ChangeUnits2?
ChangeUnits2 is rated higher. SmartLabel averages 2.2 out of 5 from 97 ratings, while ChangeUnits2 averages 5.0 from 1 ratings.
Do SmartLabel or ChangeUnits2 have ads?
Neither SmartLabel nor ChangeUnits2 shows ads.
Which is updated more often, SmartLabel or ChangeUnits2?
SmartLabel ships an update every 3 months, and ChangeUnits2 every 4 weeks. Most recently, SmartLabel was updated on June 11, 2026 and ChangeUnits2 on June 1, 2026.

Other comparisons