# Audio Function Generator vs SignalScope X

The clearest difference is review sentiment: Audio Function Generator at 77% against SignalScope X's 10%. Audio Function Generator also leads on rating (4.7 vs 3.0) and ratings volume (2.2K vs 23). SignalScope X's advantage is update cadence (every 3 weeks vs every 6 weeks). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Audio Function Generator sells 1 one-off in-app purchase and SignalScope X sells 10 in-app purchases, starting at $3.49 per month. Whichever you choose, the download price is not the number that matters.

Audio Function Generator holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 23, so its average is the more settled of the two. Written reviews point the same way: 77% of Audio Function Generator's written reviews are positive against 10% of SignalScope X's.

Audio Function Generator ships an update every 6 weeks, SignalScope X every 3 weeks. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Audio Function Generator | SignalScope X |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews)** | [3.0 (23 ratings)](https://appshunter.io/ios/app/signalscope-x/id1304775893/reviews) |
| Number of ratings | **2.2K** | 23 |
| Positive reviews | **77.2% of reviews** | 10.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 13 MB | 19 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [Faber Acoustical, LLC](https://appshunter.io/developer/284781780) |

## What reviewers say

### 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 | $14.99 | 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


### SignalScope X

[App page](https://appshunter.io/ios/app/signalscope-x/id1304775893)

This app provides powerful measurement and analysis tools for acoustics, audio, and electronics. It offers a free oscilloscope and subscription-based tool sets for basic, advanced, and professional needs, compatible across iPhone, iPad, and Mac.

**Highlights:** Oscilloscope, FFT Analyzer, Spectrogram Analyzer, Data Recorder, Sound Intensity Analyzer, Room Acoustics Analyzer

**Features:** Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Tool Set, 1 Month | $3.49 | per month |
| Advanced Tool Set, 1 Month | $9.99 | per month |
| Pro Tool Set, 1 Month | $24.99 | per month |
| Basic Tool Set, 1 Year | $34.99 | per year |
| Advanced Tool Set, 1 Year | $99.99 | per year |
| Pro Tool Set, 1 Year | $249.99 | per year |
| 14-day Free Trial, Pro Tool Set | Free | one-time |
| Basic Tool Set 2026 | $69.99 | one-time |
| Advanced Tool Set 2026 | $199.99 | one-time |
| Pro Tool Set 2026 from Advanced | $309.99 | one-time |

**What reviewers like**

- 👍 Powerful software
- 👍 Good for professional testing
- 👍 Captures faint hums
- 👍 Works well for waveforms
- 👍 Useful for guitar debugging

**What reviewers complain about**

- 💸 Expensive subscription model
- 💸 High one-time purchase cost
- 💸 Perceived as a rip-off
- 💸 Previous purchases invalidated
- 💸 Lack of upgrade path

**Reported bugs**

- Recording starts and stops
- App crashes on launch
- Oscilloscope and FFT not functioning
- SPL meter inaccurate/uncalibratable
- App not working on older devices

**Requested features**

- Manual for better understanding
- Ability to store and retrieve setups
- One-off payment option
- More intuitive user interface
- Ability to change Y-axis scale


## Frequently asked questions

### Is Audio Function Generator free?

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

### Is SignalScope X free?

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

### Which has better reviews, Audio Function Generator or SignalScope X?

Audio Function Generator is rated higher. Audio Function Generator averages 4.7 out of 5 from 2.2K ratings, while SignalScope X averages 3.0 from 23 ratings.

### Do Audio Function Generator or SignalScope X have ads?

Neither Audio Function Generator nor SignalScope X shows ads.

### Which is updated more often, Audio Function Generator or SignalScope X?

Audio Function Generator ships an update every 6 weeks, and SignalScope X every 3 weeks. Most recently, Audio Function Generator was updated on November 6, 2026 and SignalScope X on November 10, 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.*