# 我爱PDF vs Decibel Meter

The clearest difference is in-app purchases: 我爱PDF at none against Decibel Meter's 1. 我爱PDF also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Decibel Meter sells 1 one-off in-app purchase. 我爱PDF asks for nothing beyond the download.

我爱PDF ships an update every 2 months, Decibel Meter every 5 weeks. The most recent releases landed on October 4, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | 我爱PDF | Decibel Meter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 68 MB | 3 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hainan Yidaosan Technology Co., Ltd.](https://appshunter.io/developer/1764421732) | [博 彭](https://appshunter.io/developer/1293268076) |

## What reviewers say

### 我爱PDF

[App page](https://appshunter.io/ios/app/pdf/id6657960706)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-noisescope/id6760281155)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro永久版 | $1.99 | one-time |


## Frequently asked questions

### Is 我爱PDF free?

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

### Is Decibel Meter free?

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

### Do 我爱PDF or Decibel Meter have ads?

Neither 我爱PDF nor Decibel Meter shows ads.

### Which is updated more often, 我爱PDF or Decibel Meter?

我爱PDF ships an update every 2 months, and Decibel Meter every 5 weeks. Most recently, 我爱PDF was updated on October 4, 2026 and Decibel Meter on October 8, 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.*