Comparison

AudioStretch Lite vs Audio Unit Player

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

Head to head
About

AudioStretch Lite

This app allows musicians to slow down, loop, and transpose music from audio or video files. It also enables capturing video directly with your phone's camera for transcription. Ideal for learning songs by ear or experimenting with sound.

Highlights
  • Slow down audio/video without pitch change
  • Loop difficult sections
  • Transpose music notes
  • Import audio/video files
  • Capture video with phone camera
  • Live waveform scrubbing
Features
Read full description

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! FEATURES INCLUDE: 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. LIMITATIONS OF LITE 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) DETAILED FEATURES: • 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 support@audiostretch.com

About

Audio Unit Player

This music player offers real-time audio processing, including time stretching, pitch shifting, and a 31-band equalizer. It supports AUv3 effects and allows for A-B loop playback, making it ideal for practice, transcription, and performance adjustments.

Highlights
  • Real-time time stretch (50-200%)
  • Real-time pitch shift (-12 to +12 semitones)
  • 31-band equalizer with presets
  • AUv3 effects support
  • A-B loop playback
  • Background playback
  • Audio file export
Read full description

This app is a music player that can process the following effects in real time. - Time stretch (0.5-2.0 double speed) - Pitch shift (-1 ~ +1 octave) - 31 band equalizer - Reverb - AUv3 (Audio Unit v3) host [Use cases] - Karaoke's training. (Can be changed speed units of 10%, pitch shift in semitones easily) - Can playback at reduced tempo to copy phrase for guitar or bass, the keyboard instrument. - Can playback by changing the pitch to play by changing the key in the band performance (Developer himself has experience). [Function] - Perform time stretch (50 - 200%) / pitch shift (-12 - +12) in real time. - 31 bands EQ (Hz: 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.15k, 4k, 5k, 6.3k, 8k, 10k, 12.5k, 16k, 20k). - EQ preset (Abundant Built-in Presets / Custom Presets). - Reverb: Adjustable decay time (Low freq, High freq) / 13 presets - Reverb preset (Built-in Presets / Custom Presets) - Can be used as an AUv3 host. - A-B loop playback. - Center Cancel / Center Emphasis. - Lch, Rch each mute. - Quick fast forward, rewind (specify the number of seconds). - Check and set current position graphically in wave view. - Supports Auto-Lock ON/OFF. - Supports background playback. - Supports export (file writing) function (Each effect (speed/pitch/EQ) value set for each song is also reflected. The range specified in the loop section is output.) In addition to loading "music" data included in the standard music app, it also supports the function to import audio files from other apps ("Voice Memos" etc.). [How to import from "Voice Memos"] 1. Start the app "Voice Memos" and tap the mark "..." of the file to be imported from the list. 2. Tap "Share" on the sheet displayed from the bottom. 3. Tap "More" found by scrolling the displayed list of sharing destination apps to the right. 4. Select "AU Player" if available. The file is copied to this app. ================================================ [Note 1] This application will not be able to read songs of the following formats. - Songs from Apple Music, iCloud, iTunes Match - Songs that are protected by digital copyright (DRM) [Note 2] Depending on the state of your device, your custom AUv3 effects may not appear in the list. As a solution, you can solve the problem by starting "GarageBand" once and restarting this app. ================================================

Screenshots

AudioStretch Lite4 screens
Audio Unit Player3 screens

Verdict

The call

The clearest difference is in-app purchases: AudioStretch Lite at none against Audio Unit Player's 1. AudioStretch Lite also leads on ads (none vs shown) and ratings volume (617 vs 30). Audio Unit Player's advantage is update cadence (every 2 weeks vs every 3 months). On price, rating, review sentiment and device support 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

Both are free to download. Audio Unit Player sells 1 one-off in-app purchase. AudioStretch Lite asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.0 for AudioStretch Lite against 3.9 for Audio Unit Player. That said, the two scores are not equally well evidenced: AudioStretch Lite has 617 ratings behind it against 30, so its average is the more settled of the two. Written reviews are what separate them: 73% of AudioStretch Lite's written reviews are positive against 67% of Audio Unit Player's.

UpkeepUpdate frequency

AudioStretch Lite ships an update every 3 months, Audio Unit Player every 2 weeks. The most recent releases landed on September 23, 2026 and September 21, 2026 respectively.

Scorecard6 real differences · 4 level
AudioStretch Lite versus Audio Unit Player: the parameters behind the verdict, then further details
ParameterAudioStretch LiteAudio Unit Player
PriceFreeFree
Rating4.0 (617 ratings) — better3.9 (30 ratings)
Positive reviews72.9% of reviews — better66.7% of reviews
Number of ratings617 — better30
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size18 MB5 MB
Age rating4+4+
DeveloperCognosonic Pte LtdLoop-Sessions.LLC.

Customer experience

AudioStretch Lite

All ratings617 ratings
Positive75.0%
Neutral6.5%
Negative18.5%
Written reviews255 reviews
Positive72.9%
Neutral7.5%
Negative19.6%

Audio Unit Player

All ratings30 ratings
Positive70.0%
Neutral6.7%
Negative23.3%
Written reviews48 reviews
Positive66.7%
Neutral4.2%
Negative29.2%

Bugs and requests

AudioStretch Lite

Reported bugs

3 issues
  • Audio stops working after a while
  • Video disappears when trying to screen record
  • Crashes when trying to export or share content

Requested features

3 requests
  • Add more editing tools and effects
  • Improve loop management and save options
  • Implement night mode and other visual customizations

Audio Unit Player

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

AudioStretch Lite

No in-app purchases

1 purchases

Audio Unit Player

One-time1
  • Always remove banner ads.$3.99

Questions

Is AudioStretch Lite free?
AudioStretch Lite is free to download, with no in-app purchases.
Is Audio Unit Player free?
Audio Unit Player is free to download, with in-app purchases available.
Which has better reviews, AudioStretch Lite or Audio Unit Player?
AudioStretch Lite is rated higher. AudioStretch Lite averages 4.0 out of 5 from 617 ratings, while Audio Unit Player averages 3.9 from 30 ratings.
Do AudioStretch Lite or Audio Unit Player have ads?
Audio Unit Player shows ads; AudioStretch Lite does not.
Which is updated more often, AudioStretch Lite or Audio Unit Player?
AudioStretch Lite ships an update every 3 months, and Audio Unit Player every 2 weeks. Most recently, AudioStretch Lite was updated on September 23, 2026 and Audio Unit Player on September 21, 2026.

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