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Usability64Design58Speed46Security62Accessibility78Growth62

Cycling through all six. Tap any point to stop.

Measured on six things

Change a song's key and tempo separately. Free, no ads

Speed

46

Lighthouse mobile 51/100 with LCP 5.5s and TBT 744ms; desktop 79/100. That measures the Google Play listing, not the app — no in-app benchmarks were found, so the app's own snappiness is unverified.

Screenshots

1 / 1

About this app

A free, ad-free Android app by Felice Marra for musicians who practise with recordings. Shift pitch up to ±24 semitones with cent-level fine-tuning, slow or speed playback from 25% to 400% independently, and set A-B loops on a draggable waveform. It adds key/BPM detection, a 10-band EQ with presets, stereo vocal reduction, background playback with lock-screen controls, and M4A/WAV export. Files are processed on-device with no account or data collection.

Key features

  • 1Pitch shift ±24 semitones with ±50 cent fine-tuning; speed 25%-400%, independently adjustable.
  • 2A-B loop with draggable waveform markers, 5s skip, and per-song settings remembered in a library.
  • 310-band EQ with presets, stereo vocal reduction, key/BPM detection, and M4A/WAV export of loops.

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

Guitarists and bassists learning solos by ear

Pain points

Solo licks too fast to follow without losing pitch

Primary needs

Slow down playback with pitch locked and loop the tricky bars

Demographic

Singers and vocal students working with backing tracks

Pain points

Songs recorded in a key that doesn't fit their range

Primary needs

Transpose backing tracks cleanly and match them to their voice

Demographic

Music teachers and students

Pain points

No simple way to isolate passages or adjust reference recordings

Primary needs

A-B looping, key/tempo detection and exportable practice clips

Scout Review

Written by AI from measured evidence, scored out of 100.

Music Pitch & Speed Changer is a focused, well-scoped practice tool with a genuinely appealing pitch: free, ad-free, no account, on-device, and it exports your loop. The app UI is legible and branded; the Play Store listing is stock and undersells it. Speed is unmeasured for the app itself (the 51/100 Lighthouse score is Google's page), security has real header gaps but a strong privacy story, and accessibility is near-perfect on automated checks with no formal statement. Growth is the strongest dimension: a specific audience and a real wedge against paid peers.

Measure by measure

Usability

64

No account, works offline, and the store copy documents A-B looping, 5s skip, preset speed chips and a per-song settings library — genuinely practice-shaped. The dense single-screen layout and collapsed 'About this app' blurb cost it.

Design

58

Judging the app UI: dark theme with purple waveform and orange sliders reads clearly, and PITCH/SPEED readouts are legible at a glance. The Play Store listing itself is stock Google layout with three near-identical screenshots.

Speed

46

Lighthouse mobile 51/100 with LCP 5.5s and TBT 744ms; desktop 79/100. That measures the Google Play listing, not the app — no in-app benchmarks were found, so the app's own snappiness is unverified.

Security

62

HTTPS not enforced and no DMARC or Referrer-Policy, checklist 8/13. Offsetting that: no account, no data collection declared, on-device processing, and no breach history surfaced. No SOC 2/ISO/pen-test evidence found.

Accessibility

78

Lighthouse a11y 99/100 with only two failing audits (missing main landmark, label/name mismatch). Light and dark themes ship. No WCAG statement, screen-reader notes or multi-language support were found, and it's Android-only.

Growth

62

Specific audience (transcribing guitarists, transposing singers, teachers), a real wedge — free, ad-free, no IAP, on-device, loop export — against paid peers. 50+ downloads is early, not disqualifying.

Improvement areas

  • Play Store listing uses stock layout and three near-identical screenshots; the app deserves better marketing.
  • Security headers incomplete: HTTPS not enforced, no DMARC, no Referrer-Policy (8/13 checklist).
  • No accessibility statement, screen-reader notes, or multi-language support; Android-only coverage.

Design & Usability

The app UI is the stronger half: dark theme, purple waveform with draggable A/B markers, big legible PITCH and SPEED readouts, orange sliders, and consistent branding with the icon. The Play Store listing is stock Google with three near-identical screenshots, so the shopfront undersells the product. Usability is practice-shaped — no account, offline, A-B loops, 5s skip, preset speed chips, and a library that remembers each song's pitch/speed/loop. The cost is density: the visual audit flagged overlapping tap targets in a tight vertical space, and the full feature list is folded behind a collapsed 'About this app' section.

Speed & Security

Speed is measured on the wrong artifact: Lighthouse mobile 51/100, LCP 5.5s, TBT 744ms, desktop 79/100 — that's the Google Play listing, not the app. No in-app benchmarks or lag complaints surfaced, so the app's own responsiveness is unverified. Security is a mixed bag: HTTPS not enforced, no DMARC, no Referrer-Policy, secure cookies unset, 8/13 on the header checklist. Against that, the product declares no data collection, no account, and on-device processing, which is the strongest privacy posture a practice app can offer. No SOC 2, ISO, pen-test or bug bounty evidence was found, and no breach history surfaced.

Accessibility & Growth

Accessibility scores 99/100 on Lighthouse with only two failing audits — a missing main landmark and a label/accessible-name mismatch. Light and dark themes ship, but there's no WCAG statement, no screen-reader documentation, English-only copy, and Android-only coverage. Growth is a judgement on the idea: the audience is specific (guitarists transcribing solos, singers transposing backing tracks, teachers), and the wedge is concrete — free, ad-free, no IAP, on-device, with M4A/WAV export of loops and a 10-band EQ. Amazing Slow Downer and Anytune charge for the same core trick; Audacity is desktop and heavy. The limit is reach: Android-only, 50+ downloads, and no network effect to compound adoption.

Conclusion

For a guitarist or singer who wants to slow a solo, transpose a backing track and loop the hard bar without a subscription, this is a credible free option and the on-device privacy claim is a real differentiator. What's missing is proof: no in-app performance benchmarks, no accessibility statement, no security certifications, and a storefront that looks like every other Play listing. Fix the header gaps, publish a short a11y note, and give the listing three screenshots that actually show different screens — the product deserves better marketing than it's giving itself.

Suggestions for improvement

  • Enforce HTTPS and add DMARC and Referrer-Policy headers to close the 5-point checklist gap.
  • Replace the three near-identical Play Store screenshots with distinct states: loop editing, EQ, export.
  • Publish a short accessibility statement covering screen-reader support and the two failing Lighthouse audits.
  • Add a brief in-app performance note or benchmark (load time, processing latency) so speed can be judged on the app, not the store page.
How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

Music Pitch & Speed ChangerAmazing Slow DownerAudacityAnytune
Price modelFree, no ads, no in-app purchasesPaid app / licenseFree, open sourceFreemium with paid tiers
PlatformAndroidWindows, macOS, iOS, AndroidWindows, macOS, LinuxiOS, macOS (Apple-first)
A-B loop with draggable waveform markersYes, draggable A/B on waveformYesYes, via selection + loop playbackYes, core feature
Export processed audio (loop or full song)Yes, M4A or WAVYes, export to fileYes, many formatsYes, on paid tiers
On-device processing / no accountYes, no account, no data collectedLocal processing, no accountLocal, no accountLocal, account optional
Built for quick practice sessionsYes, purpose-builtYes, purpose-builtNo, general-purpose editorYes, purpose-built

Amazing Slow Downer

Long-standing pitch and tempo shifting app for practising with songs, popular among guitarists and music students.

Audacity

Free desktop audio editor that can change tempo and pitch and loop selections, though it's heavier and not built for quick practice sessions.

Anytune

Practice-focused app with pitch, tempo and loop tools for musicians, available mainly on Apple platforms.

Comparing options? See Music Pitch & Speed Changer alternatives, scored side by side

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