Comparison

AudioStretch vs Robo Flute

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

Head to head
About

AudioStretch

This tool allows musicians to slow down, loop, and transpose music from audio or video files. It's designed to help users learn songs by ear, experiment with sounds, or simply explore their music library in new ways.

Highlights
  • Import audio or video files
  • Capture video with phone camera
  • Change speed without changing pitch
  • Transpose any music
  • Loop difficult sections
  • LiveScrub waveform listening
  • Keyboard/spectrum transcription aid
Features
Currently charting
Read full description

Before you buy AudioStretch, consider first downloading AudioStretch Lite for FREE. Apart from some feature limitations, it's the same as the full (paid) version. The Lite version is a great way to see whether AudioStretch works well for you. 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. DETAILED FEATURES: • Load songs from your Music Library. (Note: songs from Apple Music have DRM and therefore cannot be loaded). • 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 • Speed range -10x to 10x, including zero speed! • Instant freeze to zero speed by double-tapping on speed display • Pitch shift range +/- 36 semitones • 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

Robo Flute

Compose music by inputting notes, fingering, and timing. Hear your compositions played on various real flutes. Convert fingerings between different flute types and improve skills with exercises.

Highlights
  • Compose music with note input
  • Hear compositions on various flutes
  • Convert fingering between flutes
  • Includes scales and exercises
  • Virtual instrument playback
  • Save, print, and export music (premium)
Features
Read full description

Using Robo Flute you can enter a musical phrase and find out how it sounds like when playing with a real flute. Insert a sequence of notes and set the fingering and timing for each note using the keyboard. Robo Flute will then play it for you. You can select from a variety of flutes including Native American Flute, Quena, Quenacho, Bansuri, Zampoña Panflute, Recorder, and Ocarina. An interesting feature of the app is that you can easily convert the fingering of your written song from one flute to another flute as much as it is convertible. In order to do that, write your song for one flute and simply open it for another flute. Even if you have no knowledge in reading music, you may still be able to write your music easily using the fingering, timing, and editing tools in the app. You may save or print your written music as well. The app includes important scales, exercises, as well as improvisation tool which can help improve your finger dexterity. Also, you can play the virtual instrument in the app if you have no access to a real flute. The premium version enables the phrase save, print, export, and import features. It unlocks all exercises, and removes all ads from the app. The in-app purchase for accessing the premium version is a single-time payment which never expires.

Screenshots

AudioStretch4 screens
Robo Flute4 screens

Verdict

The call

The clearest difference is price: Robo Flute at Free against AudioStretch's $9.99. AudioStretch's advantage is rating (4.4 vs 3.8) and review sentiment (89% vs 50%). On 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

Robo Flute is free to download; AudioStretch costs $9.99 up front. Robo Flute sells 1 one-off in-app purchase. AudioStretch asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

AudioStretch holds the better App Store score, 4.4 against 3.8. That said, the two scores are not equally well evidenced: AudioStretch has 223 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 89% of AudioStretch's written reviews are positive against 50% of Robo Flute's.

UpkeepUpdate frequency

AudioStretch ships an update every 3 months, Robo Flute every 11 months. The most recent releases landed on September 22, 2026 and August 27, 2026 respectively.

Scorecard10 real differences · 1 level
AudioStretch versus Robo Flute: the parameters behind the verdict, then further details
ParameterAudioStretchRobo Flute
Price$9.99Free — better
Rating4.4 (223 ratings) — better3.8 (8 ratings)
Positive reviews88.7% of reviews — better50.0% of reviews
Number of ratings223 — better8
Update frequencyEvery 3 months — betterEvery 11 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#59 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.6
Further details — not scored
Size18 MB20 MB
Age rating4+4+
DeveloperCognosonic Pte LtdBita Sobhani

Customer experience

AudioStretch

All ratings223 ratings
Positive83.9%
Neutral6.3%
Negative9.9%
Written reviews406 reviews
Positive88.7%
Neutral5.2%
Negative6.2%

Robo Flute

All ratings8 ratings
Positive62.5%
Neutral12.5%
Negative25.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

AudioStretch

No in-app purchases

1 purchases

Robo Flute

One-time1
  • Premium$7.99

Questions

Is AudioStretch free?
AudioStretch costs $9.99, with no in-app purchases.
Is Robo Flute free?
Robo Flute is free to download, with in-app purchases available.
Which has better reviews, AudioStretch or Robo Flute?
AudioStretch is rated higher. AudioStretch averages 4.4 out of 5 from 223 ratings, while Robo Flute averages 3.8 from 8 ratings.
Do AudioStretch or Robo Flute have ads?
Robo Flute shows ads; AudioStretch does not.
Which is updated more often, AudioStretch or Robo Flute?
AudioStretch ships an update every 3 months, and Robo Flute every 11 months. Most recently, AudioStretch was updated on September 22, 2026 and Robo Flute on August 27, 2026.

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