# Lạc Việt Reader vs Shift Unit

The clearest difference is review sentiment: Shift Unit at 100% against Lạc Việt Reader's 0%. Shift Unit also leads on rating (5.0 vs 1.0) and update cadence (every 2 months vs every 6 months). Lạc Việt Reader's advantage is iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Shift Unit holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Shift Unit has 21 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Lạc Việt Reader's written reviews are positive against 100% of Shift Unit's.

Lạc Việt Reader ships an update every 6 months, Shift Unit every 2 months. The most recent releases landed on September 30, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Lạc Việt Reader | Shift Unit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/lac-viet-reader/id544162048/reviews) | **[5.0 (21 ratings)](https://appshunter.io/ios/app/shift-unit/id1514037983/reviews)** |
| Number of ratings | 1 | **21** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 11 MB | 20 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Lac Viet Computing Corp.](https://appshunter.io/developer/384226609) | [Didier Burton](https://appshunter.io/developer/1514037982) |

## What reviewers say

### Lạc Việt Reader

[App page](https://appshunter.io/ios/app/lac-viet-reader/id544162048)

This tool allows users to easily read digital books on iOS devices. It offers features like zooming, font adjustment, and bookmarking for a better reading experience.

**Highlights:** Digital book reading, Zoom in/out, Font enlargement, Bookmarking, iOS device compatibility

**Features:** Vision Pro support

**In-app purchases:** none


### Shift Unit

[App page](https://appshunter.io/ios/app/shift-unit/id1514037983)

This utility app offers precise unit and currency conversions with over 1400 units across 34 categories. It supports light/dark modes, home widgets, and an independent Apple Watch app. Features include a custom keypad with calculator mode and educational Wikipedia integration.

**Highlights:** 1400+ conversion units, 34 categories, Light/dark mode support, Home widget, Apple Watch app, Custom keypad with calculator, Wikipedia integration

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Lạc Việt Reader free?

Lạc Việt Reader is free to download, with no in-app purchases.

### Is Shift Unit free?

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

### Which has better reviews, Lạc Việt Reader or Shift Unit?

Shift Unit is rated higher. Lạc Việt Reader averages 1.0 out of 5 from 1 ratings, while Shift Unit averages 5.0 from 21 ratings.

### Do Lạc Việt Reader or Shift Unit have ads?

Neither Lạc Việt Reader nor Shift Unit shows ads.

### Which is updated more often, Lạc Việt Reader or Shift Unit?

Lạc Việt Reader ships an update every 6 months, and Shift Unit every 2 months. Most recently, Lạc Việt Reader was updated on September 30, 2026 and Shift Unit on October 8, 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.*