# RTA Pro vs Audio Function Generator

The clearest difference is price: Audio Function Generator at Free against RTA Pro's $5.99. Audio Function Generator also leads on review sentiment (77% vs 50%) and ratings volume (2.2K vs 2). RTA Pro's advantage is in-app purchases (none vs 1) and chart position (#191 vs unranked). On update cadence, ads and device support there is nothing between them.

Audio Function Generator is free to download; RTA Pro costs $5.99 up front. Audio Function Generator sells 1 one-off in-app purchase. RTA Pro asks for nothing beyond the download.

Audio Function Generator holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 50% of RTA Pro's written reviews are positive against 77% of Audio Function Generator's.

RTA Pro ships an update every 3 months, Audio Function Generator every 6 weeks. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | RTA Pro | Audio Function Generator |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/rta-pro/id703753970/reviews) | **[4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews)** |
| Number of ratings | 2 | **2.2K** |
| Positive reviews | 50.0% of reviews | **77.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#191** | — |
| Size | 12 MB | 14 MB |
| Requires iOS | 17.6 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Matthias Schorer](https://appshunter.io/developer/290579382) | [Thomas Gruber](https://appshunter.io/developer/342699861) |

## What reviewers say

### RTA Pro

[App page](https://appshunter.io/ios/app/rta-pro/id703753970)

**Currently charting:** #191 Top Paid · Utilities (US App Store)

Transform your iOS device into a professional audio analysis tool. Analyze ambient noise frequencies, pinpoint room resonance, and set up sound systems for events. Features include custom calibration, multiple display modes, and adjustable speed settings.

**Highlights:** Real-time audio spectrum analysis, Frequency range 32Hz to 16kHz, Linear, dB(A), and dB(C) weightings, 1/3 Octave Bands, Octave Bands, and FFT display, Adjustable speed settings, Custom calibration options

**In-app purchases:** none


### Audio Function Generator

[App page](https://appshunter.io/ios/app/audio-function-generator/id768229610)

Generate various audio test tones, including sine, square, triangle, and sawtooth waves. Explore frequency and volume sweeps, noise generation, and custom preset creation. Advanced features like extended frequency ranges and multi-tone playback are available with an upgrade.

**Highlights:** Generate sine, square, triangle, and sawtooth tones, Frequency and volume sweep generation, Noise generation (white, pink, violet, etc.), Custom preset creation and saving, Extended frequency range (PRO feature), Multi-tone playback (PRO feature)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to PRO | $9.99 | one-time |

**What reviewers like**

- 👍 Great app
- 🎶 Helps with Tinnitus
- 💯 Best app I've paid for
- 🔍 Highly recommended
- 🎨 Attention to detail

**What reviewers complain about**

- 🐛 Crashes
- 💰 Deceptive/Money hungry
- 🔒 Basic features paywalled
- 🔒 Limited without paying
- 🔒 Removed functionality to push paid version

**Reported bugs**

- Crashes on launch
- Volume slider issues
- Airplay not working
- Sound distortion when display is active

**Requested features**

- Add download/save feature for custom sounds
- Improve sweep function (continuous mode, better frequency control)
- Add more multi-frequency rows
- Implement 432Hz base frequency option
- Add phase control for noise generators


## Frequently asked questions

### Is RTA Pro free?

RTA Pro costs $5.99, with no in-app purchases.

### Is Audio Function Generator free?

Audio Function Generator is free to download, with in-app purchases available.

### Which has better reviews, RTA Pro or Audio Function Generator?

Audio Function Generator is rated higher. RTA Pro averages 4.5 out of 5 from 2 ratings, while Audio Function Generator averages 4.7 from 2.2K ratings.

### Do RTA Pro or Audio Function Generator have ads?

Neither RTA Pro nor Audio Function Generator shows ads.

### Which is updated more often, RTA Pro or Audio Function Generator?

RTA Pro ships an update every 3 months, and Audio Function Generator every 6 weeks. Most recently, RTA Pro was updated on October 8, 2026 and Audio Function Generator on October 13, 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.*