Double Unit Converter vs Smart Unit Conversion
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Double Unit Converter
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With Double Units Converter you can convert two different types of units at a single screen. Simple interface. No need to switch between screens etc. Just choose your category and unit. All in one screen. Ability to copy and paste values by holding a finger on the fields. Unit categories: Length, Area, Volume, Weight and Mass, Temperature, Energy, Speed, Time, Power, Data, Pressure, Angle
Smart Unit Conversion
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This is a smart unit convertor that: 1. Support 21 languages and the Local Units 2. You can Customize the Sequence of Units 3. European number format supported Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Double Unit Converter at none against Smart Unit Conversion's 1. Double Unit Converter also leads on ads (none vs shown) and update cadence (monthly vs every 15 months). On price, 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
Both are free to download. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. Double Unit Converter asks for nothing beyond the download.
Double Unit Converter ships an update monthly, Smart Unit Conversion every 15 months. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.
| Parameter | Double Unit Converter | Smart Unit Conversion |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly — better | Every 15 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 9 MB | 41 MB |
| Age rating | 4+ | 17+ |
| Developer | MIHAIL MILUSHEV | Yui Lau |
In-app purchases
Double Unit Converter
No in-app purchases
Smart Unit Conversion
- 1 Year$1.991 Year
Questions
Is Double Unit Converter free?
Is Smart Unit Conversion free?
Do Double Unit Converter or Smart Unit Conversion have ads?
Which is updated more often, Double Unit Converter or Smart Unit Conversion?
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