Lambda vs Frequency Sound Generator App
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
Read full descriptionHide full description
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.
Frequency Sound Generator App
Generate sound frequencies from 1Hz to 25,000Hz with a simple interface. Features include wave visualization, adjustable sensitivity, and multiple waveform options. Use it for hearing tests, pet training, or as a prank tool.
- Frequency range 1Hz to 25,000Hz
- Wave visualization
- Adjustable sensitivity
- Multiple waveforms (Sine, Square, Sawtooth, Triangle)
- Custom frequency range
- Logarithmic and Linear slider modes
Read full descriptionHide full description
Frequency Sound Generator is a very simply Frequency Generator. It can provide sound frequencies in range from 1Hz to 25,000Hz. To use Frequency Generator, you could swipe your finger up and down to raise or lower the frequency of the tones. The user interface is very simple and clear. You could adjust the frequency up or down exactly in 1Hz with arrow button, and directly check the frequency by professional wave visualization. The human can hear from 20Hz to 20,000HZ, and you can use Frequency Generator to test your hearing. Usage scenarias: 1. Use Frequency Generator to annoy dogs, cats or people. 2. Use this app as dog whistle to train your dog or other pets. 3. Stop your neighbour’s dog from barking by adjusting the sound frequency until it works. 4. Use this app to tease your classmates or friends as a prank tool. 5. Mosquito repellent. Frequency Generator is easy to allow you to generate tones range from 0Hz to Ultrasonic 25kHz frequency. 1. Frequency Slider Scale - Choose between Logarithmic and Linear adjustment modes for precise frequency control 2. Adjustable Sensitivity - Select High, Medium, or Low sensitivity to match your preference for slider responsiveness 3. Multiple Waveforms - Generate different sound types including Sine, Square, Sawtooth, and Triangle waves 4. Custom Frequency Range - Set your preferred frequency range from 1 Hz to 25,000 Hz for personalized sound generation 5. Enhanced Settings - Intuitive settings interface for easy customization of all tone generation parameters Subscription Information : Frequency Sound Generator App offers an auto-renewing yearly subscription at $19.99 USD/year and auto-renewing weekly subscription at $5.99 USD/week to provide you with unlimited access to all premium features while you maintain an active subscription. Payment will be charged to the payment method connected to your iTunes Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. Your account will be charged for renewal within 24-hours prior to the end of the current period. You may manage your subscription and auto-renewal may be turned off by going to your Account Settings after purchase. Terms of service: http://fireappspro.com/tone/frequency_terms_of_use.html Privacy policy: http://www.fireappspro.com/#portfolio Please get in touch if you have any problems via email.
Screenshots
Verdict
The clearest difference is price: Frequency Sound Generator App at Free against Lambda's $2.99. Frequency Sound Generator App also leads on update cadence (every 2 months vs every 54 months) and ratings volume (4.8K vs 1). Lambda's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 2). On device support and iOS requirement 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
Frequency Sound Generator App is free to download; Lambda costs $2.99 up front. Frequency Sound Generator App sells 2 in-app purchases, starting at $5.99 per 7 days. Lambda asks for nothing beyond the download.
Lambda holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Frequency Sound Generator App has 4.8K 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 66% of Frequency Sound Generator App's.
Lambda ships an update every 54 months, Frequency Sound Generator App every 2 months. The most recent releases landed on September 17, 2026 and September 24, 2026 respectively.
| Parameter | Lambda | Frequency Sound Generator App |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.5 (4.8K ratings) |
| Positive reviews | 80.0% of reviews — better | 66.3% of reviews |
| Number of ratings | 1 | 4.8K — better |
| Update frequency | Every 54 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid — better | Subscription |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | dgApps | Min Ku |
Customer experience
Lambda
Frequency Sound Generator App
Bugs and requests
Lambda
Not enough reviews yet to summarise bugs or requests.
Frequency Sound Generator App
Reported bugs
3 issues- Frequency slider is overly sensitive
- Displayed frequency doesn't match actual output
- Inconsistent behavior between 'Play' and 'Mode' buttons
Requested features
4 requests- Option to save favorite frequencies
- Ability to type in specific frequency values
- Background playback support
- Paid ad-free version
In-app purchases
Lambda
No in-app purchases
Frequency Sound Generator App
- Unlimited Access Weekly Plan$5.997 Days
- Unlimited Access Yearly Plan$19.991 Year
Questions
Is Lambda free?
Is Frequency Sound Generator App free?
Which has better reviews, Lambda or Frequency Sound Generator App?
Do Lambda or Frequency Sound Generator App have ads?
Which is updated more often, Lambda or Frequency Sound Generator App?
Other comparisons















