# ±0正負零 vs DecibelLab

The clearest difference is in-app purchases: ±0正負零 at none against DecibelLab's 2. ±0正負零 also leads on iOS requirement (13.0 vs 18.0). DecibelLab's advantage is update cadence (every 2 days vs every 9 days). On price, ads and device support there is nothing between them.

Both are free to download. DecibelLab sells 2 in-app purchases, starting at $14.99 per year. ±0正負零 asks for nothing beyond the download.

±0正負零 ships an update every 9 days, DecibelLab every 2 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ±0正負零 | DecibelLab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 2 days** |
| Size | 75 MB | 15 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [冠源 余](https://appshunter.io/developer/1100084170) | [永芳 徐](https://appshunter.io/developer/1887200583) |

## What reviewers say

### ±0正負零

[App page](https://appshunter.io/ios/app/0/id6739824373)

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

**In-app purchases:** none


### DecibelLab

[App page](https://appshunter.io/ios/app/decibellab-sound-level-meter/id6761004946)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Annual | $14.99 | per year |
| PRO 终身版 | $19.99 | one-time |


## Frequently asked questions

### Is ±0正負零 free?

±0正負零 is free to download, with no in-app purchases.

### Is DecibelLab free?

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

### Do ±0正負零 or DecibelLab have ads?

Neither ±0正負零 nor DecibelLab shows ads.

### Which is updated more often, ±0正負零 or DecibelLab?

±0正負零 ships an update every 9 days, and DecibelLab every 2 days. Most recently, ±0正負零 was updated on October 30, 2026 and DecibelLab on October 31, 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.*