AudioStretch Lite 4+

Music Transcription Tool

Cognosonic Pte Ltd

    • 4.0 • 519 Ratings
    • Free



As a musician one of the most helpful tools you can have is the ability to slow-down, loop or auto-transpose the notes for a piece of music you are trying to learn.

AudioStretch is the world’s first audio and video transcription tool.
Now you can manipulate the pitch, speed and transcribe your tunes from both audio and video files; or by using your phone’s camera you can capture video directly into AudioStretch and transcribe it!


Import audio or video files
Capture video with your phone camera for transcription
Change the speed of files without changing the pitch
Listen to the individual notes as you drag the waveform
Play audio and video at zero speed
Transpose any music
Loop difficult to learn sections

With AudioStretch you get all of this in an incredibly responsive and easy-to-use app. Ideal for transcription, learning songs by ear, crazy sonic experimentation, or just listening to your music library in a new way.

Note: This is the LITE edition of AudioStretch, which has a few feature limitations. To get all the features, without the limitations, consider buying the Full version.


• Max song duration 3 minutes (full version 3 hours)
• Speed range from -1.5x to 1.5x (full version -10x to +10x)
• Pitch shift +/- 3 semitones (full version +/- 36 semitones)


• Load songs from your Music Library
• Document Picker import/export option supports iCloud, OneDrive, and more
• Open Dropbox files and email attachments via "Open In"
• LiveScrub™ : listen as you drag/hold the waveform
• Instant freeze to zero speed by double-tapping on speed display
• Keyboard/spectrum feature for transcription
• Super-fine speed/pitch adjustment via drag left-right on speed/pitch display
• Flexible looping feature
• No ads or in-app purchases

If you run into any problems with AudioStretch or AudioStretch Lite, please contact

What’s New

Version 6.6.8

Stability improvements and bug fixes.

See something wrong? Send your feedback to

Ratings and Reviews

4.0 out of 5
519 Ratings

519 Ratings

huzzam ,

Very nice but needs a “recents” section in the open dialog

This is *almost* the slow downer I’ve been looking for! Great clean interface (i really don’t know why most are so incredibly ugly) and it can read from the local library and my cloud services.

The one thing that seems obvious and is missing is a “recent items” section in the file open dialog. I tend to be working on a few songs at once, so why not have the top item on the + menu be “recents >” that opens up a submenu list of the last twenty files, sortable by most recent or name, and then opens them with their last pitch/time settings, markers, and loop. Then it would be perfect!

Will be upgrading to the full version, because i need more than three minutes & three semitones :)

Developer Response ,

Hi huzzam - Thank you so much for the kind words and sharing your feedback! We'll definitely consider implementing these features to the app in the future. If you have any other ideas, do not hesitate to let us know.

jisa38 ,

Love this app buttt..

I have an iPhone and after I purchased the full version I started the habit of listening to my fav songs in different speeds and pitch all the time and have all my music on this app called Documents. For the past few months I’ve had the issue of certain files I share from documents into AudioStretch, being cut out in certain times so that when I’m playing it’s skipping parts of the song

I really enjoy this app but I’m not sure what this issue is. I tried making sure the file was right and playing from documents fine but once I load it into audio it skips

Please if this could be fixed

Developer Response ,

Hey, Jisa. We apologize for the frustration! Could you write to us at with more details on the issue? Our team would be happy to help!

Fraxtil ,

It's good

This app is good. I use it to listen to demos at various pitches and identify weak points in the mix.

The app would be *great* if it could change pitch and speed in lock-step, like playing a vinyl record faster or slower, with no algorithmic artifacting. You can try to keep the pitch and speed values close to each other, but it still destroys the transients of percussive sounds, as pitch-shifting algorithms tend to do. I've been searching for an app that can do that for years, but AudioStretch is the closest I've found.

Just saying… I'd upgrade & vehemently recommend it to everyone I know if it could do that. 😉

App Privacy

The developer, Cognosonic Pte Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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