Comparison

CONVERT UNITS vs EXTAG

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

Head to head
About

CONVERT UNITS

Easily convert between various units of measurement including length, weight, temperature, and currency. Features automatic currency updates, a vast selection of currencies, and customizable display options for accuracy and rounding. Optimized for multitasking on iPad and offers a beautiful dark design.

Highlights
  • Converts length, weight, speed, area, time, pressure, volume, power, fuel, temperature, data, and currency
  • Automatic currency updates
  • 160 currencies available
  • Multitasking enabled for iPad
  • Alphabetical quick links for units
  • Customizable startup categories
  • Adjustable accuracy and rounding
Features
Read full description

CONVERT UNITS is built for the numbers a general converter treats as an afterthought: torque, pressure, viscosity, density, thermal conductivity, magnetic flux density, radioactivity, luminance. Close to 40 of its 72 categories are scientific and engineering categories, covering 685 units in total, in a fast, no-nonsense dark interface built to do one thing: give you the answer and get out of the way. Two scrolling lists, a big keypad, and a result that updates as you type. 72 CATEGORIES, 685 UNITS Torque, pressure, viscosity, density, thermal conductivity, magnetic flux density, radioactivity, luminance — plus length, weight, temperature, speed, area, volume, time, power, energy, data, fuel economy and dozens more. CURRENCY, CRYPTO AND METALS - 160 world currencies, with rates refreshed daily. - 126 cryptocurrencies. - Gold, silver, platinum and palladium. - Update rates automatically, once a day, on every launch, or only when you ask. BUILT TO BE FAST - An alphabetical index down the side of every list - jump straight to a unit instead of scrolling past hundreds. - Search every unit in every category from a single field. - Launch straight into the category you actually use and skip the home screen entirely. - Hide the categories you never touch, so the grid stays yours. PRECISION ON YOUR TERMS - Trim results by significant figures or by decimal places, whichever the spec calls for. - Significant figures keep small numbers detailed: 0.030333 at 3 figures gives 0.0303. - Decimal places line every result up on the same column: 2 places gives 13.78. - Round results up, or leave them exact. THE DETAILS - 33 languages: English, Spanish, French, German, Portuguese, Italian, Japanese, Korean, Chinese (Simplified), Chinese (Traditional), Russian, Arabic, Hindi, Thai, Turkish, Vietnamese, Swedish, Norwegian, Danish, Dutch, Romanian, Ukrainian, Czech, Polish, Croatian, Hungarian, Slovak, Malay, Indonesian, Urdu, Tamil, Telugu, and Bangla. - iPhone and iPad, with a layout built for each, plus Split View so you can convert alongside another app. - Mute the keypad and lock rotation if you prefer. - A dark design with bold, readable figures. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://developer-yl.github.io/convert-units/privacy.html

About

EXTAG

Features
Read full description

EXTAG brings you the ability to access, create, and modify documents that are on the EXTAG Platform to the iPhone. With this app, you will also be able to utilise the NFC functionality found in some of the newer iPhones to keep track of assets and tags. Please note that an EXTAG account is required to be setup prior to being able to use this app.

Screenshots

CONVERT UNITS4 screens
EXTAG4 screens

Verdict

The call

The clearest difference is in-app purchases: EXTAG at none against CONVERT UNITS's 2. EXTAG also leads on ads (none vs shown). 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. CONVERT UNITS sells 2 in-app purchases, starting at $0.99 per month. EXTAG asks for nothing beyond the download.

UpkeepUpdate frequency

CONVERT UNITS ships an update every 10 days, EXTAG weekly. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.

Scorecard2 real differences · 8 level
CONVERT UNITS versus EXTAG: the parameters behind the verdict, then further details
ParameterCONVERT UNITSEXTAG
PriceFreeFree
Rating4.7 (1.4K ratings) — better—
Positive reviews75.0% of reviews—
Number of ratings1.4K — better—
Update frequencyEvery 10 daysWeekly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.0 — better15.5
Further details — not scored
Size22 MB39 MB
Age rating4+4+
DeveloperAdysseusEXTAG Pty Ltd

Bugs and requests

CONVERT UNITS

Reported bugs

2 issues
  • App got stuck, required uninstall/reinstall to fix
  • Navigation issues, unable to get back to home page

Requested features

2 requests
  • Option to convert between functions (length to volume)
  • Remember last conversion settings for each category

EXTAG

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

CONVERT UNITS

Subscriptions1
  • Remove ads$0.991 Month
One-time1
  • Remove ads$19.99
None

EXTAG

No in-app purchases

Questions

Is CONVERT UNITS free?
CONVERT UNITS is free to download, with in-app purchases available.
Is EXTAG free?
EXTAG is free to download, with no in-app purchases.
Do CONVERT UNITS or EXTAG have ads?
CONVERT UNITS shows ads; EXTAG does not.
Which is updated more often, CONVERT UNITS or EXTAG?
CONVERT UNITS ships an update every 10 days, and EXTAG weekly. Most recently, CONVERT UNITS was updated on October 12, 2026 and EXTAG on October 2, 2026.

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