# Audio Function Generator PRO vs Smaart RTA

Audio Function Generator PRO and Smaart RTA both sit at 4.8 stars, but that hides the real split: 88% of Audio Function Generator PRO's written reviews are positive against 41% of Smaart RTA's. Audio Function Generator PRO also leads on in-app purchases (none vs 6) and chart position (#156 vs unranked). Smaart RTA's advantage is price (Free vs $9.99). On rating, ratings volume, update cadence and ads there is nothing between them.

Smaart RTA is free to download; Audio Function Generator PRO costs $9.99 up front. Smaart RTA sells 6 in-app purchases, starting at $1.99 per month. Audio Function Generator PRO asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Audio Function Generator PRO against 4.8 for Smaart RTA. Both are backed by a comparable volume of ratings — 270 and 429 respectively. Written reviews are what separate them: 88% of Audio Function Generator PRO's written reviews are positive against 41% of Smaart RTA's.

Audio Function Generator PRO ships an update every 6 weeks, Smaart RTA every 2 months. The most recent releases landed on October 21, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Audio Function Generator PRO | Smaart RTA |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [4.8 (270 ratings)](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews) | **[4.8 (429 ratings)](https://appshunter.io/ios/app/smaart-rta/id6738144288/reviews)** |
| Number of ratings | 270 | **429** |
| Positive reviews | **87.9% of reviews** | 40.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#156** | — |
| Size | 13 MB | 11 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [Rational Acoustics LLC](https://appshunter.io/developer/1755441542) |

## What reviewers say

### Audio Function Generator PRO

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

**Currently charting:** #156 Top Paid · Music (US App Store)

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


### Smaart RTA

[App page](https://appshunter.io/ios/app/smaart-rta/id6738144288)

Analyze audio in real time with professional-grade tools. Visualize frequency content, manage feedback, and monitor sound pressure levels with precision and ease, all from your mobile device.

**Highlights:** Professional RTA graph with averaging options, Spectrograph for feedback and frequency management, SPL meter with A & C weighting, Adjustable RTA graph settings, Plot calibrated levels, Target curves

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smaart RTA - Monthly | $1.99 | per month |
| Smaart RTA Pro - Monthly | $4.99 | per month |
| Smaart RTA - Annual | $19.99 | per year |
| Smaart RTA Pro - Annual | $49.99 | per year |
| Smaart RTA - Lifetime | $59.99 | one-time |
| Smaart RTA Pro - Lifetime | $149.99 | one-time |


## Frequently asked questions

### Is Audio Function Generator PRO free?

Audio Function Generator PRO costs $9.99, with no in-app purchases.

### Is Smaart RTA free?

Smaart RTA is free to download, with in-app purchases available.

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

Smaart RTA is rated higher. Audio Function Generator PRO averages 4.8 out of 5 from 270 ratings, while Smaart RTA averages 4.8 from 429 ratings.

### Do Audio Function Generator PRO or Smaart RTA have ads?

Neither Audio Function Generator PRO nor Smaart RTA shows ads.

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

Audio Function Generator PRO ships an update every 6 weeks, and Smaart RTA every 2 months. Most recently, Audio Function Generator PRO was updated on October 21, 2026 and Smaart RTA on October 18, 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.*