# Decibel Meter vs SIFDC环控

The clearest difference is in-app purchases: SIFDC环控 at none against Decibel Meter's 9. SIFDC环控 also leads on ads (none vs shown) and iOS requirement (11.0 vs 13). Decibel Meter's advantage is update cadence (every 2 weeks vs every 28 months). On price and device support there is nothing between them.

Both are free to download. Decibel Meter sells 8 in-app purchases, starting at $1.99 per 7 days. SIFDC环控 asks for nothing beyond the download.

Decibel Meter ships an update every 2 weeks, SIFDC环控 every 28 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Decibel Meter | SIFDC环控 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (907 ratings)](https://appshunter.io/ios/app/decibel-meter-measure-db-level/id1274038012/reviews)** | — |
| Number of ratings | **907** | — |
| Positive reviews | 56.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 28 months |
| Monetization | Free with in-app purchases | — |
| Size | 107 MB | 42 MB |
| Requires iOS | 13 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [文波 曾](https://appshunter.io/developer/1557199654) | [释普科技(上海)有限公司](https://appshunter.io/developer/1406216198) |

## What reviewers say

### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-measure-db-level/id1274038012)

Transform your phone into a professional-grade decibel meter for real-time noise detection. Features advanced algorithms, noise visualization, and recording capabilities for comprehensive sound analysis.

**Highlights:** Military-grade algorithm, Professional GB weighted detection, Noise recording, Noise classification system, AI ambient noise visualization, Noise dosimeter

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Free trail then subscribe | $1.99 | per 7 days |
| 分贝测试仪专业版 | $2.99 | per 3 months |
| 分贝仪专业版 | $2.99 | per 7 days |
| 分贝测试仪专业版 | $4.49 | per 6 months |
| Pro Monthly Subscription | $5.49 | per month |
| 分贝测试仪专业版 | $25.99 | per year |
| Remove advertisement | $0.99 | one-time |
| 终身尊享权益 | $29.99 | one-time |

**What reviewers like**

- 👍 Accurate decibel measurements
- 🚀 Easy to use
- 💡 Useful for various applications (e.g. restaurants, heating systems)
- 🚀 Free version works great

**What reviewers complain about**

- 🐛 Inaccurate readings at higher decibel levels
- 🔒 Requires location access for no apparent reason
- 🔒 Excessive ads and subscription model
- 🐛 Compatibility issues (e.g. no iPad support, Chinese EULA)

**Reported bugs**

- Decibel readings capped at 90 dB
- Displaying incorrect address information
- Crashing or freezing on launch
- Showing 70 dB in a completely silent room

**Requested features**

- Landscape mode for iPad
- Ability to detect sounds above 90 dB
- Option to disable ads or switch to a paid version


### SIFDC环控

[App page](https://appshunter.io/ios/app/sifdc/id1589437294)

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter free?

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

### Is SIFDC环控 free?

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

### Do Decibel Meter or SIFDC环控 have ads?

Decibel Meter shows ads; SIFDC环控 does not.

### Which is updated more often, Decibel Meter or SIFDC环控?

Decibel Meter ships an update every 2 weeks, and SIFDC环控 every 28 months. Most recently, Decibel Meter was updated on November 6, 2026 and SIFDC环控 on November 3, 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.*