# i Sound Level Meter vs 电波表对时 Time Sync

The clearest difference is review sentiment: 电波表对时 Time Sync at 77% against i Sound Level Meter's 22%. 电波表对时 Time Sync also leads on rating (5.0 vs 4.4) and ads (none vs shown). i Sound Level Meter's advantage is price (Free vs $0.99) and ratings volume (37 vs 2). On in-app purchases and device support there is nothing between them.

i Sound Level Meter is free to download; 电波表对时 Time Sync costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

电波表对时 Time Sync holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: i Sound Level Meter has 37 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 22% of i Sound Level Meter's written reviews are positive against 77% of 电波表对时 Time Sync's.

i Sound Level Meter ships an update monthly, 电波表对时 Time Sync daily. Both last shipped on September 26, 2026.

## The numbers

| Metric | i Sound Level Meter | 电波表对时 Time Sync |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.4 (37 ratings)](https://appshunter.io/ios/app/i-sound-level-meter/id912170360/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/time-sync/id6447857623/reviews)** |
| Number of ratings | **37** | 2 |
| Positive reviews | 22.0% of reviews | **76.9% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Daily** |
| Monetization | **Ad-supported** | Paid |
| Size | 7 MB | 25 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [EONSOFT](https://appshunter.io/developer/899851112) | [大连森林互动科技有限公司](https://appshunter.io/developer/1602532041) |

## What reviewers say

### i Sound Level Meter

[App page](https://appshunter.io/ios/app/i-sound-level-meter/id912170360)

Measure the noise levels around you with this sound meter. Track maximum and minimum decibel values during your measurements. For the most accurate readings, consider using a high-performance noise meter.

**Highlights:** Measures ambient noise levels, Tracks maximum noise values, Tracks minimum noise values, Displays noise measurements

**Features:** Vision Pro support

**In-app purchases:** none


### 电波表对时 Time Sync

[App page](https://appshunter.io/ios/app/time-sync/id6447857623)

This utility app simulates six major radio wave clock signals to synchronize atomic watches. It features a "MAX" gain mode for faster synchronization and a realistic interface inspired by radio oscilloscopes. The app is ad-free and offers a pure, user-focused experience for all atomic watch owners.

**Highlights:** Simulates six global radio wave signals, MAX gain signal mode for fast syncing, Supports all atomic watches and clocks, Realistic radio oscilloscope interface, Ad-free and no in-app purchases

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

**In-app purchases:** none


## Frequently asked questions

### Is i Sound Level Meter free?

i Sound Level Meter is free to download, with no in-app purchases.

### Is 电波表对时 Time Sync free?

电波表对时 Time Sync costs $0.99, with no in-app purchases.

### Which has better reviews, i Sound Level Meter or 电波表对时 Time Sync?

电波表对时 Time Sync is rated higher. i Sound Level Meter averages 4.4 out of 5 from 37 ratings, while 电波表对时 Time Sync averages 5.0 from 2 ratings.

### Do i Sound Level Meter or 电波表对时 Time Sync have ads?

i Sound Level Meter shows ads; 电波表对时 Time Sync does not.

### Which is updated more often, i Sound Level Meter or 电波表对时 Time Sync?

i Sound Level Meter ships an update monthly, and 电波表对时 Time Sync daily. Most recently, i Sound Level Meter was updated on September 26, 2026 and 电波表对时 Time Sync on September 26, 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.*