Comparison

SmartWatch BT Sync vs ChangeUnits2

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

Head to head
About

SmartWatch BT Sync

Connect your Bluetooth-enabled smartwatch to your smartphone to track, sync, and transfer all your health and activity data. Map your routes for activities like running and trekking.

Highlights
  • Connect smart watch to smartphone
  • Track, sync, and transfer data
  • Map activity routes
  • Supports smartbands and BT smartwatches
  • Bluetooth connectivity
Features
Read full description

Sync health data from your smartwatch. This app can work with types of Smartband, Smart Wearable Watch or BT Smartwatch. ***NOT SUPPORT APPLE WATCH *** Features: • Connect smart watch to smartphone. • Track, Sync & Tranfer all data • Start your activity (running, walking, trekking, workout...), show and share a map with a line showing the route map. Guide: • Turn on your Bluetooth service on all devices. (such as your iPhone & BT Smartwatch) • Open app and scan to see a list of watch devices that are near you. • Click on your device to open & view your smartwatch data. ENJOY! Please don’t forget to leave your positive comment and tell us what we missed in our app. Subscription Information: • Payment will be charged to iTunes Account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. • The account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: https://an.viet.ltd-company-vn.com/privacy-policy Term Of Use: https://an.viet.ltd-company-vn.com/terms-of-use Get Support: https://an.viet.ltd-company-vn.com/contact-us

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

SmartWatch BT Sync3 screens
ChangeUnits24 screens

Verdict

The call

The clearest difference is price: SmartWatch BT Sync at Free against ChangeUnits2's $0.99. SmartWatch BT Sync also leads on ratings volume (227 vs 1). ChangeUnits2's advantage is rating (5.0 vs 3.8) and in-app purchases (none vs 2). On ads, 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

SmartWatch BT Sync is free to download; ChangeUnits2 costs $0.99 up front. SmartWatch BT Sync sells 2 in-app purchases, starting at $1.99 per 7 days. ChangeUnits2 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ChangeUnits2 holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: SmartWatch BT Sync has 227 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

SmartWatch BT Sync ships an update every 3 months, ChangeUnits2 every 4 weeks. The most recent releases landed on September 23, 2026 and June 1, 2026 respectively.

Scorecard6 real differences · 4 level
SmartWatch BT Sync versus ChangeUnits2: the parameters behind the verdict, then further details
ParameterSmartWatch BT SyncChangeUnits2
PriceFree — better$0.99
Rating3.8 (227 ratings)5.0 (1 ratings) — better
Positive reviews18.2% of reviews—
Number of ratings227 — better1
Update frequencyEvery 3 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS14.1 — better15.6
Further details — not scored
Size44 MB17 MB
Age rating4+4+
DeveloperAN VIET COMPANY LIMITEDJack McCormack

Customer experience

SmartWatch BT Sync

All ratings227 ratings
Positive67.8%
Neutral2.2%
Negative30.0%
Written reviews11 reviews
Positive18.2%
Neutral0.0%
Negative81.8%

ChangeUnits2

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

In-app purchases

2 purchases

SmartWatch BT Sync

Subscriptions2
  • Access all for weekly$1.997 Days
  • Access all for yearly$19.991 Year
None

ChangeUnits2

No in-app purchases

Questions

Is SmartWatch BT Sync free?
SmartWatch BT Sync is free to download, with in-app purchases available.
Is ChangeUnits2 free?
ChangeUnits2 costs $0.99, with no in-app purchases.
Which has better reviews, SmartWatch BT Sync or ChangeUnits2?
ChangeUnits2 is rated higher. SmartWatch BT Sync averages 3.8 out of 5 from 227 ratings, while ChangeUnits2 averages 5.0 from 1 ratings.
Do SmartWatch BT Sync or ChangeUnits2 have ads?
Neither SmartWatch BT Sync nor ChangeUnits2 shows ads.
Which is updated more often, SmartWatch BT Sync or ChangeUnits2?
SmartWatch BT Sync ships an update every 3 months, and ChangeUnits2 every 4 weeks. Most recently, SmartWatch BT Sync was updated on September 23, 2026 and ChangeUnits2 on June 1, 2026.

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