Units vs Xviewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Units
Easily convert between a wide range of measurement units and currencies. Features a clear and simple interface for quick conversions of length, mass, volume, speed, and more. Supports popular currencies and common units for everyday use.
- Extensive unit conversions
- Multiple currency support
- Easy and clear handling
- Converts length, mass, volume
- Supports speed, area, pressure
- Converts time and temperature
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Unit converter with many different units of measurement and currencies. Very easy handling. Clearly arranged. The most important units are amongst others: - Currencies: United States dollar, Euro, Japanese yen, Pound sterling - Length: Mile, kilometer, meter, inch - Mass: Kilogram, pound, ounce, gram - Volume: Liter, gallon (several) - Speed - Area - Units of information - Pressure - Power - Time - Temperature Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Xviewer
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XViewer is an app communicating with Arduino Opta PLCs via APIs through WiFi in order to monitor production, sensors' status, production logs, production errors and to configure production and printer settings. The Arduino library to communicate with the APP can be found on GitHub!
Screenshots
Verdict
The clearest difference is in-app purchases: Xviewer at none against Units's 3. Xviewer also leads on iOS requirement (11.0 vs 15.0). Units's advantage is update cadence (every 5 weeks vs every 8 months). On price, ads 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
Both are free to download. Units sells 3 in-app purchases, starting at $0.99 per month. Xviewer asks for nothing beyond the download.
Units ships an update every 5 weeks, Xviewer every 8 months. The most recent releases landed on October 11, 2026 and October 10, 2026 respectively.
| Parameter | Units | Xviewer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (261 ratings) — better | — |
| Positive reviews | 45.5% of reviews | — |
| Number of ratings | 261 — better | — |
| Update frequency | Every 5 weeks — better | Every 8 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Andreas Maier | I.D.T. SOCIETA' A RESPONSABILITA' LIMITATA SOCIETA’ BENEFIT |
In-app purchases
Units
- Monthly7 Days trial$0.991 Month
- Yearly7 Days trial$4.991 Year
- One time purchase$9.99
Xviewer
No in-app purchases
