Lambda vs WaveCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lambda
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.
- 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
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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.
WaveCalc
This utility app assists audio professionals with complex sound calculations. It helps determine parameters like delay, wavelength, and SPL drop for various audio applications.
- Delay calculation
- Wavelength calculation
- SPL drop calculation
- Sound propagation parameters
- Audio professional tools
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WaveCalc is an app developed for sound engineers, system techs, and other audio professionals for calculating delay, wavelength, SPL drop, and other sound propagation parameters.
Screenshots
Verdict
The clearest difference is price: WaveCalc at Free against Lambda's $2.99. WaveCalc also leads on update cadence (every 2 months vs every 54 months) and iOS requirement (13 vs 15.6). Lambda's advantage is in-app purchases (none vs 4). On rating, ratings volume, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
WaveCalc is free to download; Lambda costs $2.99 up front. WaveCalc sells 4 one-off in-app purchases. Lambda asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Lambda against 5.0 for WaveCalc. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Lambda ships an update every 54 months, WaveCalc every 2 months. The most recent releases landed on October 4, 2026 and September 20, 2026 respectively.
| Parameter | Lambda | WaveCalc |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 54 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 13 — better |
| Further details — not scored | ||
| Size | 6 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | dgApps | Valerie Gard |
Customer experience
Lambda
WaveCalc
In-app purchases
Lambda
No in-app purchases
WaveCalc
- Tip$3.99
- Tip$6.99
- Tip$17.99
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- Unlock Pro$19.99
