# Sonic Master vs 要知

The clearest difference is in-app purchases: 要知 at none against Sonic Master's 2. 要知 also leads on ads (none vs shown) and update cadence (fortnightly vs every 4 months). Sonic Master's advantage is rating (4.6 vs 4.3) and review sentiment (83% vs 68%). On price, ratings volume, device support and iOS requirement there is nothing between them.

Both are free to download. Sonic Master sells 2 one-off in-app purchases. 要知 asks for nothing beyond the download.

Sonic Master holds the better App Store score, 4.6 against 4.3. Both are backed by a comparable volume of ratings — 46 and 17 respectively. Written reviews point the same way: 83% of Sonic Master's written reviews are positive against 68% of 要知's.

Sonic Master ships an update every 4 months, 要知 fortnightly. The most recent releases landed on September 14, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | Sonic Master | 要知 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (46 ratings)](https://appshunter.io/ios/app/sonic-master-dust-clear/id1500104231/reviews)** | [4.3 (17 ratings)](https://appshunter.io/ios/app/24/id1618892080/reviews) |
| Number of ratings | **46** | 17 |
| Positive reviews | **83.3% of reviews** | 68.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 32 MB | 53 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [东海 刘](https://appshunter.io/developer/1454617571) | [Qingdao Ruanmei Network Technology Co., ltd.](https://appshunter.io/developer/570610862) |

## What reviewers say

### Sonic Master

[App page](https://appshunter.io/ios/app/sonic-master-dust-clear/id1500104231)

Generate and export custom sound waves with various waveforms. This app also features tools to remove water and dust from your phone's speakers, a focus timer, music timer, nature sounds, and a decibel meter.

**Highlights:** Sound wave generator (1-20kHz), Multiple waveform options, Audio file export, Water and dust removal for speakers, Focus timer (Pomodoro Technique), Nature soundscapes, Decibel meter

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Edition | $1.99 | one-time |
| Lifetime Pro Edition | $3.99 | one-time |


### 要知

[App page](https://appshunter.io/ios/app/24/id1618892080)

This app provides a concise daily briefing of major events from the past 24 hours, week, and year. It aims to combat information overload by summarizing key news across domestic and international topics, social media trends, and various sectors like technology, finance, and entertainment.

**Highlights:** Daily event summaries, 24-hour, weekly, and yearly recaps, Covers domestic and international news, Includes social media trends, Summarizes tech, finance, and entertainment news

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sonic Master free?

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

### Is 要知 free?

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

### Which has better reviews, Sonic Master or 要知?

Sonic Master is rated higher. Sonic Master averages 4.6 out of 5 from 46 ratings, while 要知 averages 4.3 from 17 ratings.

### Do Sonic Master or 要知 have ads?

Sonic Master shows ads; 要知 does not.

### Which is updated more often, Sonic Master or 要知?

Sonic Master ships an update every 4 months, and 要知 fortnightly. Most recently, Sonic Master was updated on September 14, 2026 and 要知 on August 12, 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.*