# Decibel Meter vs HydroCalc

The clearest difference is price: Decibel Meter at Free against HydroCalc's $2.99. Decibel Meter also leads on ratings volume (719 vs 3). HydroCalc's advantage is review sentiment (100% vs 57%) and in-app purchases (none vs 4). On device support and iOS requirement there is nothing between them.

Decibel Meter is free to download; HydroCalc costs $2.99 up front. Decibel Meter sells 4 in-app purchases, starting at $1.99 per 7 days. HydroCalc asks for nothing beyond the download.

HydroCalc holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Decibel Meter has 719 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 57% of Decibel Meter's written reviews are positive against 100% of HydroCalc's.

## The numbers

| Metric | Decibel Meter | HydroCalc |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.6 (719 ratings)](https://appshunter.io/ios/app/decibel-meter-db/id1521325229/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hydrocalc-manning-calculator/id6761231476/reviews)** |
| Number of ratings | **719** | 3 |
| Positive reviews | 56.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | — |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 36 MB | 59 MB |
| Requires iOS | 16.1 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Devnex](https://appshunter.io/developer/1486636842) | [PATRICK D MC CLELLAN](https://appshunter.io/developer/1872120544) |

## What reviewers say

### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-db/id1521325229)

Easily measure sound levels with this accurate and intuitive tool. It displays current, maximum, and average decibel values, along with a graphical overview for quick comprehension. This utility is completely free to use.

**Highlights:** Simple and easy to use, Quick and accurate dB measuring, All-in-one meter, Maximum, current, and average values, Gauge meter display, Values displayed in graph

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly subscription | $1.99 | per 7 days |
| Monthly Subscription | $2.99 | per month |
| Weekly Subscription | $3.99 | per 7 days |
| Half-Yearly Subscription | $9.49 | per 6 months |

**What reviewers like**

- 🚀 Fast and reliable
- 👍 Easy to use
- 🔍 Accurate readings
- 📏 Good for monitoring sound levels
- 🔊 Useful for music/audio enthusiasts

**What reviewers complain about**

- 🐛 Crashes/freezes on some devices
- 💰 Misleading about free features
- 📢 Excessive ads/prompts to buy premium
- 🤔 Inconsistent readings compared to other apps

**Reported bugs**

- Unable to close the app or cancel Google requests
- Recordings not saving despite claims of free saving

**Requested features**

- Add ability to save/export recordings
- Provide more customization options (weighting, etc.)
- Improve stability and reduce crashes


### HydroCalc

[App page](https://appshunter.io/ios/app/hydrocalc-manning-calculator/id6761231476)

This tool calculates open channel and pipe flow using the Manning equation. It's designed for engineers, designers, and students to quickly evaluate hydraulic conditions without manual calculations or spreadsheets. The app works offline and supports various input options for flexible use.

**Highlights:** Calculate flow, velocity, depth, slope, and hydraulic radius, Supports open channel and circular pipe conditions, Flexible input options, Intuitive interface, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter free?

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

### Is HydroCalc free?

HydroCalc costs $2.99, with no in-app purchases.

### Which has better reviews, Decibel Meter or HydroCalc?

HydroCalc is rated higher. Decibel Meter averages 4.6 out of 5 from 719 ratings, while HydroCalc averages 5.0 from 3 ratings.

### Do Decibel Meter or HydroCalc have ads?

Decibel Meter shows ads; HydroCalc does not.

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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.*