# Lambda

> Converts between musical notes, frequencies, and wavelengths for audio professionals. (iPhone/iPad app by Dave Guerin.)

- Source: https://appshunter.io/ios/app/lambda/id434581690 (this page in markdown: same URL + `.md`)
- Developer: [Dave Guerin](https://appshunter.io/developer/357488432)
- Category: Utilities, Music
- Price: $2.99
- Rating: 5.00/5 from 1 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 6 MB
- Languages: English
- Released: 2011-05-05
- Data updated: 2026-06-15
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/lambda/id434581690/reviews.md

## What is Lambda?

Musicians and Sound Engineers. Musical Notes and Frequencies and Wavelengths.

Now there's an app from dgApps to convert between them all.

The app features a sliding fader to dynamically change frequency, wavelength and musical note, with locks to step through standard third octave frequencies or whole musical notes. 

There's a built in oscillator so you can hear the frequency, and a frequency tracker so the app can tell you the frequency. Both the oscillator and the frequency tracker display the audio waveform.

A settings section allows for different tuning standards, and variations in the speed of sound. Lambda can also receive calculated Speed of Sound in Air values from another dgApps app, Cair. Lambda is now a universal app, equally at home on an iPhone as on an iPad. In Split Mode on an iPad device, side by side with Cair, the calculated Speed of Sound in Air is passed in real time to the Lambda app.

Lambda allows you to share frequency/wavelength/note data via all the usual sharing methods.

## Key features

- 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

## Chart rankings

- #191 in Top Paid · Utilities (US App Store)

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/lambda/id434581690/reviews.md

### 2/5 — IOS8 Issue

*2014-10-10, version 1.0*

Has stopped working on IOS 8 it just freezes and doesn't let you use any features

### 5/5 — Great Job!

*2014-09-03*

This app does exactly what was looking for and it looks minimalistic, the white on black makes it look sleek and not too bright for when I'm working on music late at night. Perfect for me :)

### 5/5 — Very Simple but effective

*2011-12-26, version 1.0*

Helpful tool to use either as a tone reference, for when I'm tuning guitars or as a tone generator.

### 4/5 — Very useful app

*2011-08-16, version 1.0*

Great app for sound techs or musicians, in need of perfect pitching or wavelength calculation. Much quicker then a calculator for working out spacing in a sub array, which is what I use it for.

### 5/5 — I like it ... A lot.

*2011-05-12, version 1.0*

Great app and essential for anyone working with audio. I used it to sort the intonation on my acoustic guitar today; much quicker and more accurate than using a microphone-based guitar tuner. It also works well as a synth, though I don't think that was the intended purpose for this app ;)

## Frequently asked questions about Lambda

### What is Lambda used for?

Lambda is a utility app designed for musicians and sound engineers. It allows users to convert between musical notes, frequencies, and wavelengths, featuring tools like a dynamic fader, oscillator, and frequency tracker.

### Does Lambda have ads?

No, Lambda does not contain advertisements. It is a paid application that offers an ad-free experience for its users.

### What devices does Lambda support?

Lambda is a universal app that runs on iPhone, iPad, and iPod devices. It is optimized for both iPhone and iPad, including Split Mode functionality on iPads.

### How often is Lambda updated?

Lambda was last updated on February 16, 2023, with version 3.0.0. This indicates a history of updates, suggesting ongoing support and potential improvements.

### Can Lambda be used offline?

The provided information does not explicitly state offline functionality. However, its core features like conversion and analysis are typically usable without an active internet connection.

### What is the price of Lambda?

Lambda is available for a one-time purchase price of $2.99. There are no subscription fees or in-app purchases mentioned.

### What is the age rating for Lambda?

Lambda has an age rating of 4+, making it suitable for a wide range of users. This rating suggests it contains no mature content.

### Can Lambda integrate with other apps?

Yes, Lambda can receive calculated Speed of Sound in Air values from another dgApps app called Cair. This real-time data transfer enhances its functionality for specific use cases.

## Version history (last 5 releases)

### 5.0.0 — 2026-05-01

5.0.0
Fully updated for iOS 26
Fully updated for iPadOS 26

### 3.0.0 — 2023-02-16

Fully updated for iOS 15 and 16 and iPadOS 15 and 16.
iOS 15.0 and iPadOS 15 and up now.
Now using SwiftPackages.
UI updated to work on all current devices.
Audio tone generator totally rewritten from scratch using AudioKit, Swift, and SwiftUI.
Audio frequency tracker totally rewritten from scratch using AudioKit, Swift, and SwiftUI.
This is the first time Swift and SwiftUI has been used in an app from dgApps!
The Privacy Policy is now show in the users default browser from dgapps.ie.
The Harmonic table has been reworked so that the text isn't overwritten.
The Questions and Comments email should now open in the users default email client.
Slight tweaks to the design of the Frequency of A4 and the Speed of Sound settings.
All screens now respect the users appearance settings for dark or light modes.

### 2.0.1 — 2017-01-31

This app has been updated by Apple to display the Apple Watch app icon.

Better handling of the Speed of Sound in Air notifications from the Cair app.
Bug fixes.

### 2.0.0 — 2017-01-26

Fully updated and rewritten for iOS 10.
Now features a Frequency Tracker.
Now using AudioKit.
Now a universal iPhone and iPad app.
Now rotates to all orientations.
Now features a waveform plot for both the Oscillator and the Frequency Tracker.
Now uses both imperial and metric units for both wavelength and the Speed of Sound.
Can use the Speed of Sound in Air as calculated by another dgApps app Cair.
The Cair calculated Speed of Sound in Air is passed in real time to the Lambda app, especially useful in Split Mode on an iPad device when Lambda is side by side with Cair.

### 1.0 — 2011-05-05

No release notes.

## Apps similar to Lambda

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Audio Function Generator](https://appshunter.io/ios/app/audio-function-generator/id768229610) | 4.7 (2,144) | Free | Utilities |
| [Frequency Sound Generator App](https://appshunter.io/ios/app/frequency-sound-generator-app/id1238160553) | 4.5 (4,832) | Free | Utilities |
| [Sonic Pitch Sound Generator](https://appshunter.io/ios/app/sonic-pitch-sound-generator/id1187701748) | 4.5 (1,821) | Free | Utilities |
| [Speaker Cleaner \| Clear Wave](https://appshunter.io/ios/app/speaker-cleaner-clear-wave/id6462873536) | 4.6 (1,289) | Free | Utilities |
| [Tone Generator Speaker Cleaner](https://appshunter.io/ios/app/tone-generator-speaker-cleaner/id1671426872) | 3.6 (18) | Free | Utilities |
| [Generate Frequency Sounds Hz](https://appshunter.io/ios/app/generate-frequency-sounds-hz/id1516257706) | 3.8 (13) | Free | Utilities |

## More apps by Dave Guerin

- [Futurometer](https://appshunter.io/ios/app/futurometer/id357488429)
- [Colo-u-ring](https://appshunter.io/ios/app/colo-u-ring/id1120052422)
- [Cair](https://appshunter.io/ios/app/cair/id1197989847)
- [Faders by dgApps](https://appshunter.io/ios/app/faders-by-dgapps/id1534494376)
- [Router by dgApps](https://appshunter.io/ios/app/router-by-dgapps/id1561324955)

All apps by Dave Guerin: https://appshunter.io/developer/357488432

## Related topics

[lambda](https://appshunter.io/ios/topics/lambda) · [lambaa](https://appshunter.io/ios/topics/lambaa)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-15.*