# Conversion vs DS One

The clearest difference is price: DS One at Free against Conversion's $0.99. DS One also leads on rating (4.7 vs 3.0) and ratings volume (78 vs 5). Conversion's advantage is in-app purchases (none vs 6). On review sentiment and ads there is nothing between them.

DS One is free to download; Conversion costs $0.99 up front. DS One sells 4 in-app purchases, starting at $0.99 per month. Conversion asks for nothing beyond the download.

DS One holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: DS One has 78 ratings behind it against 5, so its average is the more settled of the two. Written reviews split almost evenly too, at 61% and 60% positive.

Conversion ships an update every 2 months, DS One monthly. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Conversion | DS One |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.0 (5 ratings)](https://appshunter.io/ios/app/conversion-unit-converter/id286552073/reviews) | **[4.7 (78 ratings)](https://appshunter.io/ios/app/ds-one-video-library-and-player/id6476057278/reviews)** |
| Number of ratings | 5 | **78** |
| Positive reviews | **61.0% of reviews** | 60.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 222 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Duncan Campbell](https://appshunter.io/developer/286552076) | [大为 张](https://appshunter.io/developer/1296098078) |

## What reviewers say

### Conversion

[App page](https://appshunter.io/ios/app/conversion-unit-converter/id286552073)

This utility app provides instant conversions between a wide range of units, including metric, imperial, and currency. It features live exchange rates and supports 33 languages, all within a clean, clutter-free interface.

**Highlights:** Extensive unit categories (12 categories, 96 units), Live, offline-capable currency exchange rates, Supports 33 languages and regional number formats, Modern, clutter-free interface with fluid animations, Full VoiceOver and accessibility support, No ads, analytics, or tracking

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

**In-app purchases:** none


### DS One

[App page](https://appshunter.io/ios/app/ds-one-video-library-and-player/id6476057278)

This app serves as a comprehensive NAS management tool, unifying video, music, and file handling. It offers extensive format support for media playback, including high-quality video and audio, along with subtitle customization and picture-in-picture functionality. Users can also efficiently browse and manage files directly from their NAS.

**Highlights:** Wide video format support, High-quality video playback (HD, 4K, HDR), Subtitle support and adjustment, Picture-in-picture video, Mainstream and lossless audio support, Music lyrics and cover art display, NAS file management

**Features:** macOS Compatibility, Siri integration

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DS Cloud Pro - Monthly | $0.99 | per month |
| DS Cloud Pro - Monthly | $0.99 | per month |
| DS Cloud Pro - Annual | $7.99 | per year |
| DS Cloud Pro - Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Conversion free?

Conversion costs $0.99, with no in-app purchases.

### Is DS One free?

DS One is free to download, with in-app purchases available.

### Which has better reviews, Conversion or DS One?

DS One is rated higher. Conversion averages 3.0 out of 5 from 5 ratings, while DS One averages 4.7 from 78 ratings.

### Do Conversion or DS One have ads?

Neither Conversion nor DS One shows ads.

### Which is updated more often, Conversion or DS One?

Conversion ships an update every 2 months, and DS One monthly. Most recently, Conversion was updated on October 21, 2026 and DS One 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.*