# HVAC语音助手 vs Shift

The clearest difference is review sentiment: Shift at 100% against HVAC语音助手's 0%. Shift also leads on update cadence (weekly vs every 12 months). HVAC语音助手's advantage is in-app purchases (none vs 4) and iOS requirement (9.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Shift sells 4 one-off in-app purchases. HVAC语音助手 asks for nothing beyond the download.

HVAC语音助手 ships an update every 12 months, Shift weekly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | HVAC语音助手 | Shift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/shift-pdf-and-video-converter/id6758735749/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 18 MB | 21 MB |
| Requires iOS | **9.0** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [荣锋 林](https://appshunter.io/developer/1042936800) | [Antonio Stilla](https://appshunter.io/developer/1678600356) |

## What reviewers say

### HVAC语音助手

[App page](https://appshunter.io/ios/app/hvac/id1459208239)

This utility app allows users to manage their smart home devices, including thermostats, by connecting them to the cloud and integrating with voice assistants. It facilitates voice control for managing home environments.

**Highlights:** Account registration and login, Manage home and room settings, Device management, Cloud synchronization for thermostats, Amazon Alexa voice control integration

**Features:** macOS Compatibility

**In-app purchases:** none


### Shift

[App page](https://appshunter.io/ios/app/shift-pdf-and-video-converter/id6758735749)

This app converts and compresses various file types locally on your device, ensuring privacy. It handles images, videos, audio, and documents with a focus on speed and ease of use.

**Highlights:** Local file processing, Image conversion and compression, Video file shrinking, Audio extraction, PDF document management, Smart compression with quality control

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Support | $0.99 | one-time |
| Special Support | $3.99 | one-time |
| Super Support | $8.99 | one-time |
| Shift Premium | $12.99 | one-time |


## Frequently asked questions

### Is HVAC语音助手 free?

HVAC语音助手 is free to download, with no in-app purchases.

### Is Shift free?

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

### Do HVAC语音助手 or Shift have ads?

Neither HVAC语音助手 nor Shift shows ads.

### Which is updated more often, HVAC语音助手 or Shift?

HVAC语音助手 ships an update every 12 months, and Shift weekly. Most recently, HVAC语音助手 was updated on November 3, 2026 and Shift on October 31, 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.*