# Audio Function Generator PRO vs fjalla

The clearest difference is price: fjalla at Free against Audio Function Generator PRO's $9.99. fjalla also leads on update cadence (weekly vs every 6 weeks). Audio Function Generator PRO's advantage is in-app purchases (none vs 5) and chart position (#65 vs unranked). On ads, device support and iOS requirement there is nothing between them.

fjalla is free to download; Audio Function Generator PRO costs $9.99 up front. fjalla sells 5 one-off in-app purchases. Audio Function Generator PRO asks for nothing beyond the download.

Audio Function Generator PRO ships an update every 6 weeks, fjalla weekly. The most recent releases landed on October 17, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Audio Function Generator PRO | fjalla |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.8 (270 ratings)](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews)** | — |
| Number of ratings | **270** | — |
| Positive reviews | 87.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free | — |
| Best chart rank | **#65** | — |
| Size | 13 MB | 49 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [Fjalla company](https://appshunter.io/developer/1766520612) |

## What reviewers say

### Audio Function Generator PRO

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

**Currently charting:** #65 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


### fjalla

[App page](https://appshunter.io/ios/app/fjalla/id6670492390)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 49 Streams | $1.00 | one-time |
| 98 Streams | $2.00 | one-time |
| 245 Streams | $4.00 | one-time |
| 721 Streams | $14.00 | one-time |
| 1021 Streams | $19.99 | one-time |


## Frequently asked questions

### Is Audio Function Generator PRO free?

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

### Is fjalla free?

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

### Do Audio Function Generator PRO or fjalla have ads?

Neither Audio Function Generator PRO nor fjalla shows ads.

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

Audio Function Generator PRO ships an update every 6 weeks, and fjalla weekly. Most recently, Audio Function Generator PRO was updated on October 17, 2026 and fjalla on October 6, 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.*