# CalendarIn vs Decibel Meter dB

The clearest difference is update cadence: CalendarIn at every 2 days against Decibel Meter dB's every 4 months. CalendarIn also leads on price ($0.99 vs $3.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

CalendarIn costs $0.99 and Decibel Meter dB $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CalendarIn ships an update every 2 days, Decibel Meter dB every 4 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CalendarIn | Decibel Meter dB |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/decibel-meter-db/id6740335067/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 months |
| Monetization | — | Paid |
| Size | 7 MB | 1 MB |
| Requires iOS | 16.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [乐祥 胡](https://appshunter.io/developer/1572365721) | [Morten Punnerud](https://appshunter.io/developer/969844397) |

## What reviewers say

### CalendarIn

[App page](https://appshunter.io/ios/app/calendarin/id6737374585)

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

**In-app purchases:** none


### Decibel Meter dB

[App page](https://appshunter.io/ios/app/decibel-meter-db/id6740335067)

This app provides real-time decibel monitoring with a dynamic visual display and color-coded alerts for different noise thresholds. It helps users track sound levels, understand potential risks, and maintain healthier audio environments. Ideal for various settings, it offers a simple and effective way to stay aware of ambient noise.

**Highlights:** Real-time decibel monitoring, Animated visual ear display, Color-coded noise alerts, 1-minute average tracking, Spectrogram view, Optimized for iPhone and iPad

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

**In-app purchases:** none


## Frequently asked questions

### Is CalendarIn free?

CalendarIn costs $0.99, with no in-app purchases.

### Is Decibel Meter dB free?

Decibel Meter dB costs $3.99, with no in-app purchases.

### Do CalendarIn or Decibel Meter dB have ads?

Neither CalendarIn nor Decibel Meter dB shows ads.

### Which is updated more often, CalendarIn or Decibel Meter dB?

CalendarIn ships an update every 2 days, and Decibel Meter dB every 4 months. Most recently, CalendarIn was updated on October 25, 2026 and Decibel Meter dB on October 24, 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.*