# 外研剑桥Join In vs Decibels Meter

The clearest difference is update cadence: Decibels Meter at every 9 days against 外研剑桥Join In's every 2 months. 外研剑桥Join In's advantage is iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

外研剑桥Join In ships an update every 2 months, Decibels Meter every 9 days. The most recent releases landed on September 5, 2026 and December 21, 2025 respectively.

## The numbers

| Metric | 外研剑桥Join In | Decibels Meter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Size | 38 MB | 27 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [凡 吕](https://appshunter.io/developer/1660488640) | [剑 罗](https://appshunter.io/developer/1854272181) |

## What reviewers say

### 外研剑桥Join In

[App page](https://appshunter.io/ios/app/join-in/id1668536502)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibels Meter

[App page](https://appshunter.io/ios/app/decibels-meter/id6755508693)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 外研剑桥Join In free?

外研剑桥Join In is free to download, with no in-app purchases.

### Is Decibels Meter free?

Decibels Meter is free to download, with no in-app purchases.

### Do 外研剑桥Join In or Decibels Meter have ads?

Neither 外研剑桥Join In nor Decibels Meter shows ads.

### Which is updated more often, 外研剑桥Join In or Decibels Meter?

外研剑桥Join In ships an update every 2 months, and Decibels Meter every 9 days. Most recently, 外研剑桥Join In was updated on September 5, 2026 and Decibels Meter on December 21, 2025.

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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.*