AudioStretch vs String Theory
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
Read full descriptionHide 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
String Theory
This app helps guitarists explore scales and chords with an interactive fretboard. It allows users to compare scales, test custom tunings, and record riff ideas. The tool is designed for practicing improvisation, learning theory, and saving musical inspiration.
- Interactive guitar fretboard with scale mapping
- Scale and Chord Finder tools
- Custom tunings with octave control
- Riff recording and vault organization
- Left-handed mode
- Scale comparison overlay
Read full descriptionHide full description
String Theory is a focused guitar tool for exploring scales, visualizing the fretboard, matching chords, and capturing riff ideas without clutter. Build better fretboard awareness with an interactive scales map, compare two scales at once, test custom tunings, and find compatible chords in seconds. When inspiration hits, record the idea and save it to your riff vault with notes and playback. Features: • Interactive guitar fretboard with scale mapping • Major, harmonic minor, melodic minor, and pentatonic scale families • Scale Finder and Chord Finder tools • Chords-to-scales matching • Add a second scale overlay for comparison • Custom tunings with per-string octave control • Left-handed fretboard mode • Fullscreen fretboard view • Riff recording, playback, rename, share, and vault organization • Light/dark mode, 3 color themes, haptics, and a polished liquid glass interface Whether you’re practicing improvisation, learning theory, or saving new ideas, String Theory keeps the essential guitar tools in one fast, modern app.
Screenshots
Verdict
The clearest difference is rating: String Theory at 5.0 against AudioStretch's 4.4. String Theory also leads on price ($1.99 vs $9.99) and review sentiment (100% vs 89%). AudioStretch's advantage is ratings volume (230 vs 1) and chart position (#74 vs unranked). On ads, in-app purchases, monetization model 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
AudioStretch costs $9.99 and String Theory $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
String Theory holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: AudioStretch has 230 ratings behind it against 1, 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 100% of String Theory's.
| Parameter | AudioStretch | String Theory |
|---|---|---|
| Price | $9.99 | $1.99 — better |
| Rating | 4.4 (230 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 88.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 230 — better | 1 |
| Update frequency | Every 3 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #74 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 18 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Cognosonic Pte Ltd | DANIEL NIKOLAS SZTURM |
Customer experience
AudioStretch
String Theory
In-app purchases
AudioStretch
No in-app purchases
String Theory
No in-app purchases
Questions
Is AudioStretch free?
Is String Theory free?
Which has better reviews, AudioStretch or String Theory?
Do AudioStretch or String Theory have ads?
Other comparisons















