# CSiUnits vs Unit Converter

CSiUnits and Unit Converter both sit at 4.8 stars, but that hides the real split: 90% of Unit Converter's written reviews are positive against 50% of CSiUnits's. Unit Converter also leads on update cadence (weekly vs monthly) and ratings volume (18 vs 5). CSiUnits's advantage is device support (3 vs 1) and iOS requirement (9.0 vs 17.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.8 for CSiUnits against 4.9 for Unit Converter. Both are backed by a comparable volume of ratings — 5 and 18 respectively. Written reviews are what separate them: 50% of CSiUnits's written reviews are positive against 90% of Unit Converter's.

CSiUnits ships an update monthly, Unit Converter weekly. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CSiUnits | Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (5 ratings)](https://appshunter.io/ios/app/csiunits/id1344138128/reviews) | **[4.9 (18 ratings)](https://appshunter.io/ios/app/unit-converter-scientific/id6692634387/reviews)** |
| Number of ratings | 5 | **18** |
| Positive reviews | 50.0% of reviews | **90.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free | Free |
| Size | 13 MB | 4 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Computers and Structures, Inc.](https://appshunter.io/developer/1119970032) | [Ahmet Burak Albayrak](https://appshunter.io/developer/1769045837) |

## What reviewers say

### CSiUnits

[App page](https://appshunter.io/ios/app/csiunits/id1344138128)

This application provides a comprehensive tool for converting units across various scientific disciplines and everyday needs. It offers over 70 conversion options, catering to professionals, students, and anyone requiring precise unit transformations.

**Highlights:** Multiple one-time conversion lists, Conversions for lifestyle and science, Over 70 conversion options, Numeric value input, Converted values to all possible units

**In-app purchases:** none


### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-scientific/id6692634387)

Easily perform instant unit conversions across a vast array of categories, from engineering to everyday life. Features include dark mode, favorites, and dual language support for enhanced usability. Ideal for scientists, engineers, students, and anyone needing quick, accurate conversions.

**Highlights:** Extensive conversion categories, Dark mode for night use, Favorite frequently used conversions, Dual language support, Offline functionality, User feedback option

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CSiUnits free?

CSiUnits is free to download, with no in-app purchases.

### Is Unit Converter free?

Unit Converter is free to download, with no in-app purchases.

### Which has better reviews, CSiUnits or Unit Converter?

Unit Converter is rated higher. CSiUnits averages 4.8 out of 5 from 5 ratings, while Unit Converter averages 4.9 from 18 ratings.

### Do CSiUnits or Unit Converter have ads?

Neither CSiUnits nor Unit Converter shows ads.

### Which is updated more often, CSiUnits or Unit Converter?

CSiUnits ships an update monthly, and Unit Converter weekly. Most recently, CSiUnits was updated on October 22, 2026 and Unit Converter on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*