# 凯力朗智能 vs Sd2 Voice Amplifier App

The clearest difference is update cadence: 凯力朗智能 at every 5 months against Sd2 Voice Amplifier App's every 32 months. 凯力朗智能 also leads on iOS requirement (8.0 vs 13.1). On price, rating, ratings volume and ads 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 — 1.0 for 凯力朗智能 against 1.0 for Sd2 Voice Amplifier App. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

凯力朗智能 ships an update every 5 months, Sd2 Voice Amplifier App every 32 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | 凯力朗智能 | Sd2 Voice Amplifier App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/id1448073060/reviews) | [1.0 (1 ratings)](https://appshunter.io/ios/app/sd2-voice-amplifier-app/id1613578391/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 32 months |
| Monetization | — | Free |
| Size | 49 MB | 1 MB |
| Requires iOS | **8.0** | 13.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wenzhou Yunjia Network Technology Co., Ltd.](https://appshunter.io/developer/1448073059) | [Transport Financial Services, LLC](https://appshunter.io/developer/1613578393) |

## What reviewers say

### 凯力朗智能

[App page](https://appshunter.io/ios/app/id1448073060)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sd2 Voice Amplifier App

[App page](https://appshunter.io/ios/app/sd2-voice-amplifier-app/id1613578391)

This utility app enhances your voice, making it clearer and louder, especially when speaking through a mask. It's also useful for public speaking with external speakers or for individuals with medical conditions affecting their vocal volume.

**Highlights:** Reduces muffled mask voice, Amplifies voice for public speaking, Assists individuals with low vocal volume, Clearer and louder speech output

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 凯力朗智能 free?

凯力朗智能 is free to download, with no in-app purchases.

### Is Sd2 Voice Amplifier App free?

Sd2 Voice Amplifier App is free to download, with no in-app purchases.

### Which has better reviews, 凯力朗智能 or Sd2 Voice Amplifier App?

凯力朗智能 and Sd2 Voice Amplifier App are both rated 1.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do 凯力朗智能 or Sd2 Voice Amplifier App have ads?

Neither 凯力朗智能 nor Sd2 Voice Amplifier App shows ads.

### Which is updated more often, 凯力朗智能 or Sd2 Voice Amplifier App?

凯力朗智能 ships an update every 5 months, and Sd2 Voice Amplifier App every 32 months. Most recently, 凯力朗智能 was updated on October 26, 2026 and Sd2 Voice Amplifier App on October 27, 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.*