Comparison

Lambda vs Voice text translator

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

Voice text translator

Communicate effortlessly across 27 languages with real-time voice and text translation. This tool supports speech-to-speech conversations, editing translated text, and managing message history, making it ideal for travelers and language learners.

Highlights
  • 27 language translations
  • Speech-to-speech conversation
  • Automatic translation
  • Edit and modify texts
  • Message history
  • Zoom font
  • Favorite messages
Features
Read full description

Voice text translator makes your communications more alive in 27 different languages. Make it your best friend to use it at any time and anywhere you need. It helps you to improve a foreign language. It is an essential tool when you travel overseas. Features: - Choose source/target language - Automatic translation after 1.5 second blank - 37 languages including accents for the voice languages - 3 text languages - Speech to speech conversation - Edit and modify all original source texts - Zoom in / zoom out font - Delete message - Copy message to paste in an other app or paste here - Switch to an other accent language - Number and timestamps in messages - Favorite messages - Keep message history of the last 100 of non favorite - Filter language search for both source and target language - Read in karaoke style - iOS 10 and 11 support - Light weight - Max 500 characters per message Currently supported Voice-to-Voice languages: English (US) English (GB) English (Australia) English (Ireland) English (South Africa) Spanish (Spain) Spanish (Mexico) Arabic (Saudi Arabia) Mandarin (China / Simplified) Mandarin (Hong Kong) Mandarin (Taiwan / Traditional) Czech Danish Dutch (Belgium) Dutch (Netherlands) French (France) French (Canada) Finnish German Greek Hebrew Hindi Hungarian Italian Indonesian Japanese Korean Norwegian Polish Portuguese (Brazil) Portuguese (Portugal) Romanian Russian Slovak Swedish Thai Turkish Currently supported Speech-to-Text languages: Vietnamese, Tagalog and Farsi To use the whole functions, you need to allow the access to: * Speech recognition * Microphone

Screenshots

Lambda4 screens
Voice text translator2 screens

Verdict

The call

The clearest difference is update cadence: Voice text translator at every 7 months against Lambda's every 54 months. Voice text translator also leads on price ($0.99 vs $2.99). On rating, ratings volume, ads and in-app purchases 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

Lambda costs $2.99 and Voice text translator $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Lambda against 5.0 for Voice text translator. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Lambda ships an update every 54 months, Voice text translator every 7 months. The most recent releases landed on October 4, 2026 and July 7, 2026 respectively.

Scorecard2 real differences · 8 level
Lambda versus Voice text translator: the parameters behind the verdict, then further details
ParameterLambdaVoice text translator
Price$2.99$0.99 — better
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews80.0% of reviews—
Number of ratings11
Update frequencyEvery 54 monthsEvery 7 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.6
Further details — not scored
Size6 MB2 MB
Age rating4+4+
DeveloperdgAppsStephane Ameau

Customer experience

Lambda

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

Voice text translator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Lambda

No in-app purchases

None

Voice text translator

No in-app purchases

Questions

Is Lambda free?
Lambda costs $2.99, with no in-app purchases.
Is Voice text translator free?
Voice text translator costs $0.99, with no in-app purchases.
Which has better reviews, Lambda or Voice text translator?
Lambda and Voice text translator are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Lambda or Voice text translator have ads?
Neither Lambda nor Voice text translator shows ads.
Which is updated more often, Lambda or Voice text translator?
Lambda ships an update every 54 months, and Voice text translator every 7 months. Most recently, Lambda was updated on October 4, 2026 and Voice text translator on July 7, 2026.

Other comparisons