Comparison

Lambda vs Smooth Talker

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

Smooth Talker

This advanced video editor automatically removes silent pauses from your videos and audio recordings. Streamline content creation for social media or efficiently edit lectures and discussions by cutting out unnecessary quiet moments.

Highlights
  • Remove silent parts from audio and video
  • Edit silent threshold
  • Set minimum silence length
  • Add padding time between clips
  • Remove audio blips
  • Preview before cutting
  • Export for social networks
Features
Read full description

Create better VIDEO and social media entries with Smooth Talker, a highly advanced video editor where you can automatically cut out the part where you are silent. This is a great app for influencers on Instagram, TikTok, YouTube, or other social media. You can create a short, smooth video for your audience without fuss and look confident while doing so. This is also a great app for students to edit lectures, classes, or discussion sessions. Create better AUDIO when you have recordings of lectures, seminars, discussions, or conversations that you want to trim. Get transcriptions, with timestamps, and translations of audio recordings. You don’t have to spend hours to select and cut these parts manually because we will do all the heavy lifting for you. You can get “clean” video or audio with all the silent part cut out within a minute or two. === FEATURES OF SMOOTH TALKER – REMOVE SILENCE IN AUDIO AND VIDEO: === + Remove Silent part of audio and video automatically + Edit silent threshold + Set the minimum silence length + Add padding time between clips. + Remove Audio Blips + Preview before video is cut. + Export for social network of your choice (Instagram, Tiktok, Facebook, etc) How to Cut Out Silence Automatically: 1. Select which file to cut 2. Adjust the settings: Silence Threshold, Audio Padding, Remove Blips, and Silence Lengths. 3. Export the video to the Social Network site of your choice. Not everyone is born with eloquence but even the best of us have moments where we pause to gather our thoughts. This app will help you tremendously to trim videos for our silent moments and make it sound natural. You may have to play with the settings of minimum silence length, padding time and blips. You can also save a lot of time listening to silence in classes or seminars because you can simply trim the silent part with our app instantly. --- Thank you for using our app to automatically edit your videos. Please support us by leaving your rating and review for this app, and please share it to your friends and family. Subscriptions will be charged via your iTunes account. Any unused portion of a Free Trial, if offered, is forfeited when you buy a subscription. Your subscription will automatically renew unless it is canceled at least 24 hours before the end of the current period. You can manage your subscription in settings. By using Smooth Talker, you agree to the Terms of Service (https://www.butler.tools/terms) and Privacy Policy (https://www.butler.tools/privacy).

Screenshots

Lambda4 screens
Smooth Talker3 screens

Verdict

The call

The clearest difference is price: Smooth Talker at Free against Lambda's $2.99. Smooth Talker also leads on update cadence (monthly vs every 54 months) and ratings volume (27 vs 1). Lambda's advantage is rating (5.0 vs 3.2) and in-app purchases (none vs 5). 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

CostPrice · In-app purchases · Ads · Monetization

Smooth Talker is free to download; Lambda costs $2.99 up front. Smooth Talker sells 5 in-app purchases, starting at $9.99 per month. Lambda asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Lambda holds the better App Store score, 5.0 against 3.2. That said, the two scores are not equally well evidenced: Smooth Talker has 27 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 46% of Smooth Talker's.

UpkeepUpdate frequency

Lambda ships an update every 54 months, Smooth Talker monthly. The most recent releases landed on September 17, 2026 and September 16, 2026 respectively.

Scorecard8 real differences · 2 level
Lambda versus Smooth Talker: the parameters behind the verdict, then further details
ParameterLambdaSmooth Talker
Price$2.99Free — better
Rating5.0 (1 ratings) — better3.2 (27 ratings)
Positive reviews80.0% of reviews — better46.2% of reviews
Number of ratings127 — better
Update frequencyEvery 54 monthsMonthly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.614.0 — better
Further details — not scored
Size6 MB7 MB
Age rating4+4+
DeveloperdgAppsAxiom Technology Holdings, LLC.

Customer experience

Lambda

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

Smooth Talker

All ratings27 ratings
Positive51.9%
Neutral7.4%
Negative40.7%
Written reviews13 reviews
Positive46.2%
Neutral7.7%
Negative46.2%

In-app purchases

None

Lambda

No in-app purchases

5 purchases

Smooth Talker

Subscriptions2
  • Pro Access Monthly$9.991 Month
  • Pro Access Yearly$18.991 Year
One-time3
  • Export to Camera Roll$18.99
  • Export to Camera Roll$28.99
  • Lifetime Pro Access$39.99

Questions

Is Lambda free?
Lambda costs $2.99, with no in-app purchases.
Is Smooth Talker free?
Smooth Talker is free to download, with in-app purchases available.
Which has better reviews, Lambda or Smooth Talker?
Lambda is rated higher. Lambda averages 5.0 out of 5 from 1 ratings, while Smooth Talker averages 3.2 from 27 ratings.
Do Lambda or Smooth Talker have ads?
Smooth Talker shows ads; Lambda does not.
Which is updated more often, Lambda or Smooth Talker?
Lambda ships an update every 54 months, and Smooth Talker monthly. Most recently, Lambda was updated on September 17, 2026 and Smooth Talker on September 16, 2026.

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