# DOI Ethics vs 噪音检测仪

The clearest difference is in-app purchases: DOI Ethics at none against 噪音检测仪's 3. 噪音检测仪's advantage is update cadence (monthly vs every 3 months) and ratings volume (3 vs 1). On price, rating, ads and device support there is nothing between them.

Both are free to download. 噪音检测仪 sells 3 in-app purchases, starting at $0.49 per month. DOI Ethics asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for DOI Ethics against 5.0 for 噪音检测仪. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

DOI Ethics ships an update every 3 months, 噪音检测仪 monthly. The most recent releases landed on October 3, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | DOI Ethics | 噪音检测仪 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/doi-ethics/id1498505971/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/pro/id1511859076/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 79 MB | 10 MB |
| Requires iOS | 18.6 | **10.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [U.S. Department of the Interior](https://appshunter.io/developer/1498505970) | [传胜 贾](https://appshunter.io/developer/789568029) |

## What reviewers say

### DOI Ethics

[App page](https://appshunter.io/ios/app/doi-ethics/id1498505971)

This app offers clear summaries of federal ethics rules and regulations for DOI employees. It includes interactive videos, resources, and a section for completing and submitting DOI-related forms, ensuring easy access to important information.

**Highlights:** Up-to-date federal ethics rules, Summaries of ethics laws, Interactive videos, Handy resources, Forms and Reporting section

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

**In-app purchases:** none


### 噪音检测仪

[App page](https://appshunter.io/ios/app/pro/id1511859076)

Record sound environments and display real-time decibel levels. Capture high-quality video with added watermarks to prevent piracy. Set custom recording durations for your needs.

**Highlights:** Record sound environments, Real-time decibel display, Set recording duration, High-quality video recording, Add watermark to videos

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Monthly | $0.49 | per month |
| VIP Annual | $3.99 | per year |
| VIP  Permanent | $6.99 | one-time |


## Frequently asked questions

### Is DOI Ethics free?

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

### Is 噪音检测仪 free?

噪音检测仪 is free to download, with in-app purchases available.

### Which has better reviews, DOI Ethics or 噪音检测仪?

DOI Ethics and 噪音检测仪 are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do DOI Ethics or 噪音检测仪 have ads?

Neither DOI Ethics nor 噪音检测仪 shows ads.

### Which is updated more often, DOI Ethics or 噪音检测仪?

DOI Ethics ships an update every 3 months, and 噪音检测仪 monthly. Most recently, DOI Ethics was updated on October 3, 2026 and 噪音检测仪 on October 15, 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.*