# Audio Function Generator PRO vs Sound Decibel Meter

The clearest difference is review sentiment: Audio Function Generator PRO at 88% against Sound Decibel Meter's 40%. Audio Function Generator PRO also leads on in-app purchases (none vs 2) and rating (4.8 vs 4.5). Sound Decibel Meter's advantage is price (Free vs $14.99) and device support (4 vs 2). On ratings volume, update cadence, ads and iOS requirement there is nothing between them.

Sound Decibel Meter is free to download; Audio Function Generator PRO costs $14.99 up front. Sound Decibel Meter sells 2 in-app purchases, starting at $4.99 per month. Audio Function Generator PRO asks for nothing beyond the download.

Audio Function Generator PRO holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 270 and 336 respectively. Written reviews point the same way: 88% of Audio Function Generator PRO's written reviews are positive against 40% of Sound Decibel Meter's.

Audio Function Generator PRO ships an update every 6 weeks, Sound Decibel Meter every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Audio Function Generator PRO | Sound Decibel Meter |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| Rating | **[4.8 (270 ratings)](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews)** | [4.5 (336 ratings)](https://appshunter.io/ios/app/sound-decibel-meter-nioshosha/id1571075296/reviews) |
| Number of ratings | 270 | **336** |
| Positive reviews | **87.9% of reviews** | 40.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | **Free** | Subscription |
| Size | 13 MB | 18 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [Arpenik Katikyan](https://appshunter.io/developer/1613951852) |

## What reviewers say

### Audio Function Generator PRO

[App page](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703)

Generate various audio test tones, including sine, square, and sawtooth waves. Explore frequency and volume sweeps, custom presets, and different types of noise. Advanced settings allow for fine-tuning signal parameters and creating complex multi-tone sequences.

**Highlights:** Generate sine, square, triangular, and sawtooth tones, Frequency and volume sweep generation, Customizable presets and configurations, Multiple noise types (White, Pink, Violet, etc.), Advanced signal parameter control, Multi-tone and dual function generation

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

**In-app purchases:** none

**What reviewers like**

- ✨ Superb craftsmanship and work
- 🚀 Excellent performance on older devices
- 💡 History feature is a great addition
- 👍 Versatile and powerful app
- 🎶 Great for binaural beats and sound creation

**What reviewers complain about**

- 📉 Linear sweep is useless
- ❓ Missing PWM functionality
- ❓ Missing Terzrauschen (third-octave noise)
- 🐛 Volume button issues
- 🐛 GUI is bad

**Reported bugs**

- Volume button issues (jumps up and down, displays wrong level)
- Update crashes on iPad Air2 when changing screens
- App opens AppStore repeatedly after purchase
- Buttons don't respond, settings don't keep
- Frequencies stick, program is useless

**Requested features**

- Logarithmic sweeps and frequency slider scale
- PWM functionality
- Terzrauschen (third-octave noise)
- Ping-pong sweeps in Multitone windows
- Sweeping of noise/adding noise in Multitone sweep with sweeping bandpass filter


### Sound Decibel Meter

[App page](https://appshunter.io/ios/app/sound-decibel-meter-nioshosha/id1571075296)

Measure ambient noise levels with this clear, simple, and accurate app. It helps you monitor hearing health by detecting noise types, analyzing sound pressure, and syncing data with your Health app. Features include recording, sharing, and adherence to OSHA/NIOSH standards.

**Highlights:** Smart AI noise meter, Accurate sound pressure measurements, Sync with Health app, Sound recording and data saving, OSHA and NIOSH standards, Measurement range 20db to 160db, Microphone calibration

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spectrogram-noise level tools | $4.99 | per month |
| Spectrogram-noise level tools | $5.99 | per month |


## Frequently asked questions

### Is Audio Function Generator PRO free?

Audio Function Generator PRO costs $14.99, with no in-app purchases.

### Is Sound Decibel Meter free?

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

### Which has better reviews, Audio Function Generator PRO or Sound Decibel Meter?

Audio Function Generator PRO is rated higher. Audio Function Generator PRO averages 4.8 out of 5 from 270 ratings, while Sound Decibel Meter averages 4.5 from 336 ratings.

### Do Audio Function Generator PRO or Sound Decibel Meter have ads?

Neither Audio Function Generator PRO nor Sound Decibel Meter shows ads.

### Which is updated more often, Audio Function Generator PRO or Sound Decibel Meter?

Audio Function Generator PRO ships an update every 6 weeks, and Sound Decibel Meter every 2 months. Most recently, Audio Function Generator PRO was updated on November 1, 2026 and Sound Decibel Meter on November 3, 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.*