Comparison

Lambda vs Frequency

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read 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.

About

Frequency

Generate precise audio frequencies for various purposes, from tuning instruments to cleaning water from speakers. Explore different waveforms and customize sound generation for unique audio experiences. Elevate your audio quality and functionality.

Highlights
  • Generate frequencies from 1 Hz to 40,000 Hz
  • Clean water/moisture from speakers
  • Produce sine, triangle, sawtooth, and square waveforms
  • Tune musical instruments
  • Select notes and octaves for specific pitches
  • Play multiple frequencies simultaneously
Features
Read full description

# GENERATE ANY TONE, FROM 1 HZ TO 40 KHZ Frequency is a tone generator. Set a pitch by hertz or by note and octave, choose a waveform, and play it. It also plays the low sweep that pushes water out of a blocked speaker. # PLAY A TONE AT ANY FREQUENCY Enter a value in hertz, or pick a note and an octave and let the app work it out. The range runs from 1 Hz to 40,000 Hz, past the top of human hearing. # CHOOSE YOUR WAVEFORM Sine, triangle, sawtooth, and square. Each has its own character, and switching between them at the same pitch is the quickest way to hear the difference. # PLAY SEVERAL TONES AT ONCE Run more than one tone together, each with its own frequency, waveform, and volume, and listen to how they interact. # CLEAN YOUR SPEAKER Water trapped in a speaker muffles it. Playing a low-frequency tone at full volume vibrates the driver and pushes the water out — the same technique a smartwatch uses to eject water after a swim. # A REFERENCE PITCH TO TUNE AGAINST Play a note at a known frequency and tune your instrument to it by ear. Frequency plays the reference; it does not listen, so nothing you play reaches the app. # TUTORIALS INCLUDED Step-by-step guides for generating tones, working with waveforms, running several at once, and cleaning a speaker. # SUBSCRIPTIONS AND AUTOMATIC RENEWAL - Your subscription includes access to the features listed above. - Payment will be charged to your Apple ID Account at confirmation of purchase. - Subscription automatically renews unless auto-renewal is turned off at least 24 hours before the end of the current period. - Your account will be charged for renewal within 24 hours prior to the end of your selected subscription period. - Subscriptions can be managed and auto-renewal turned off in your App Store Account Settings. # LEGAL Terms of Service: https://cooptimizeit.com/terms-of-service Privacy Policy: https://cooptimizeit.com/privacy-policy # SUPPORT Contact us at info@cooptimizeit.com. We reply within 48 hours.

Screenshots

Lambda4 screens
Frequency4 screens

Verdict

The call

The clearest difference is review sentiment: Lambda at 80% against Frequency's 0%. Lambda also leads on rating (5.0 vs 3.9) and in-app purchases (none vs 10). Frequency's advantage is price (Free vs $2.99) and update cadence (every 10 days vs every 54 months). On ads, 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

CostPrice · In-app purchases · Ads · Monetization

Frequency is free to download; Lambda costs $2.99 up front. Frequency sells 9 in-app purchases, starting at $7.99 per 7 days. Lambda asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Lambda holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Frequency has 24 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 0% of Frequency's.

UpkeepUpdate frequency

Lambda ships an update every 54 months, Frequency every 10 days. The most recent releases landed on September 17, 2026 and September 7, 2026 respectively.

Scorecard7 real differences · 3 level
Lambda versus Frequency: the parameters behind the verdict, then further details
ParameterLambdaFrequency
Price$2.99Free — better
Rating5.0 (1 ratings) — better3.9 (24 ratings)
Positive reviews80.0% of reviews — better0.0% of reviews
Number of ratings124 — better
Update frequencyEvery 54 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better16.0
Further details — not scored
Size6 MB16 MB
Age rating4+4+
DeveloperdgAppsOptimize IT

Customer experience

Lambda

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

Frequency

All ratings24 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Lambda

No in-app purchases

9 purchases

Frequency

Subscriptions9
  • Weekly Premium$7.997 Days
  • Weekly7 Days trial$9.997 Days
  • Weekly VIP3 Days trial$9.997 Days
Show 6 more
  • Monthly Premium$17.991 Month
  • Monthly7 Days trial$19.991 Month
  • Annual VIP$24.991 Year
  • Annual Premium$24.991 Year
  • Annual VIP3 Days trial2 variants$29.991 Year
  • Annual7 Days trial$29.991 Year

Questions

Is Lambda free?
Lambda costs $2.99, with no in-app purchases.
Is Frequency free?
Frequency is free to download, with in-app purchases available.
Which has better reviews, Lambda or Frequency?
Lambda is rated higher. Lambda averages 5.0 out of 5 from 1 ratings, while Frequency averages 3.9 from 24 ratings.
Do Lambda or Frequency have ads?
Neither Lambda nor Frequency shows ads.
Which is updated more often, Lambda or Frequency?
Lambda ships an update every 54 months, and Frequency every 10 days. Most recently, Lambda was updated on September 17, 2026 and Frequency on September 7, 2026.

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