Units Free vs Pro Unit Converter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Units Free
Easily convert between various units across multiple categories like length, temperature, and weight. Access past conversions through a history list and send calculations via email. This free version offers core functionality with an option to upgrade for full category access.
- Multiple unit categories (length, temp, weight, etc.)
- Metric and imperial system support
- Conversion history list
- Send calculations via email
- iPad multitasking support
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Convert between many units from several categories and different unit systems (metric, imperial, ...). Features: - categories: length, temperature, capacity, weight, energy, power, pressure, area - access previous conversions from the history list - categories have different colors (in the history as well) - flip units - send calculations by email - support for the iPhone 6 and 6+ - support for the iPad multitasking (split view..) (Free version: requires upgrade to arbitrarily switch categories)
Pro Unit Converter
This free utility app offers a quick and convenient way to convert various units with a beautiful and intuitive interface. Save frequently used conversions for easy access and convert everything from area and length to temperature and data.
- Multiple conversion categories
- Save frequent conversions
- Intuitive user interface
- Quick input and results
- Beautiful design
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A great and free application, Pro Unit Converter provides users with many tools for converting units in a quick, convenient, and beautiful manner. You can save conversions you use often so that you can access them quickly next time. It has an intuitive user interface so that you can input and view the results in a matter of seconds. Let's start with these categories: - Area - Length - Pressure - Power - Fuel-Mileage - Volume - Temperature - Speed - Weight - Angle - Torque - Shoes Size - Data - Force - Energy Thank you for your using this app.
Screenshots
Verdict
The clearest difference is review sentiment: Pro Unit Converter at 100% against Units Free's 0%. Pro Unit Converter also leads on update cadence (daily vs every 5 months) and monetization model (free vs free with in-app purchases). Units Free's advantage is iOS requirement (5.1.1 vs 11.0). On price, 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
Both are free to download. Units Free sells 1 one-off in-app purchase and Pro Unit Converter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Units Free ships an update every 5 months, Pro Unit Converter daily. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.
| Parameter | Units Free | Pro Unit Converter |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 5.1.1 — better | 11.0 |
| Further details — not scored | ||
| Size | 3 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Piet Jonas | Quang Tri Mai Nguyen |
Customer experience
Units Free
Pro Unit Converter
In-app purchases
Units Free
- Units Free Upgrade$0.99
Pro Unit Converter
- Remove all Ads in the app$0.99
Questions
Is Units Free free?
Is Pro Unit Converter free?
Do Units Free or Pro Unit Converter have ads?
Which is updated more often, Units Free or Pro Unit Converter?
Other comparisons
