# Lambda vs Audio Function Generator

The clearest difference is price: Audio Function Generator at Free against Lambda's $2.99. Audio Function Generator also leads on update cadence (every 6 weeks vs every 54 months) and ratings volume (2.2K vs 1). Lambda's advantage is in-app purchases (none vs 1) and rating (5.0 vs 4.7). On review sentiment, ads, device support and iOS requirement there is nothing between them.

Audio Function Generator is free to download; Lambda costs $2.99 up front. Audio Function Generator sells 1 one-off in-app purchase. Lambda asks for nothing beyond the download.

Lambda holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 80% of Lambda's written reviews are positive against 77% of Audio Function Generator's.

Lambda ships an update every 54 months, Audio Function Generator every 6 weeks. The most recent releases landed on September 17, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Lambda | Audio Function Generator |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lambda/id434581690/reviews)** | [4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews) |
| Number of ratings | 1 | **2.2K** |
| Positive reviews | **80.0% of reviews** | 77.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 54 months | **Every 6 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 6 MB | 14 MB |
| Requires iOS | 15.6 | **15.5** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [dgApps](https://appshunter.io/developer/357488432) | [Thomas Gruber](https://appshunter.io/developer/342699861) |

## What reviewers say

### Lambda

[App page](https://appshunter.io/ios/app/lambda/id434581690)

This app helps musicians and sound engineers convert between musical notes, frequencies, and wavelengths. It features a dynamic fader, built-in oscillator, and frequency tracker with waveform display. Customize tuning standards and speed of sound for precise audio analysis.

**Highlights:** Convert notes, frequencies, wavelengths, Dynamic fader for real-time adjustment, Built-in oscillator with waveform, Frequency tracker with waveform, Customizable tuning standards, Adjustable speed of sound, Share data via standard methods

**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 Lambda free?

Lambda costs $2.99, 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, Lambda or Audio Function Generator?

Lambda is rated higher. Lambda averages 5.0 out of 5 from 1 ratings, while Audio Function Generator averages 4.7 from 2.2K ratings.

### Do Lambda or Audio Function Generator have ads?

Neither Lambda nor Audio Function Generator shows ads.

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

Lambda ships an update every 54 months, and Audio Function Generator every 6 weeks. Most recently, Lambda was updated on September 17, 2026 and Audio Function Generator on September 24, 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.*