528 Player vs KeyTempo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
528 Player
This app allows you to tune your music to the 528Hz frequency, believed to promote harmony and healing. It offers a full-featured listening experience with EQ and no ads or limitations, designed to bring a brighter feeling and support well-being.
- Pitch shift music to 528Hz tuning
- Full access with no limitations
- Built-in Equalizer (EQ)
- No advertisements
- One-time payment, no in-app purchases
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One Time Payment for the 528 Player - No Ads, Full Access, EQ, No Limitations, No In-App Purchases Humanity is out of tune. The mass media is tuned to the concert pitch of A=440hz, but recent research shows that this pitch might be disharmonious with our bodies and minds. The 528hz is believed to resemble a code underlying our very universe in all aspects - light, time, gravity, magnetism, DNA, and sacred geometry, among others. As sound (vibration) influences the mind and body immediately, even the slightest constant dissonance can bring confusion, inner chaos, and a blind eye to what is going on around. That's why there is a movement in the music world that aims to bring the 528hz pitch into our lives. The 528 Player allows you to pitch shift your music to the C5=528hz tuning which is A=444Hz tuning. It offers no ads, full access, EQ, no limitations, and no in-app purchases. By using this player, you can enjoy the brighter feeling it brings while experiencing the healing qualities for your body and mind. Please note that the app won't play Apple Music files and will only work on music tuned to A=440 Hz. Also, make sure that you have songs on your device; otherwise, the app won't have anything to play. If something is not working, send an email to contact@appums.com, and we'll try to find a solution. Join us on this journey to explore the benefits of tuning to healing frequencies. Love, light, and meditation. P.S. We strongly recommend doing your research on this matter and not relying solely upon our opinion and research.
KeyTempo
Adjust music pitch and tempo in real-time without affecting the other. Loop sections for practice or slow down audio for learning. Save your adjusted tracks as new files. Works offline with an intuitive interface.
- Real-time pitch control
- Real-time tempo control
- A-B repeat looping
- Export adjusted audio
- Supports multiple audio formats
- Offline functionality
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A music player that lets you independently adjust pitch and tempo in real time. Key Features - Pitch control: -12 to +12 semitones (keeps original speed) - Tempo control: 50% to 150% (keeps original pitch) - A-B repeat: Loop any section for focused practice - Export: Save adjusted audio as a new file Perfect for - Musicians practicing at slower speeds - Singers adjusting song keys - Students repeating difficult sections - Language learners slowing down audio Why KeyTempo? - No ads - Focus on your practice - Intuitive UI - No complicated settings - Real-time control - Change pitch/tempo without interruption - Works offline - No internet needed - No sign-up required - Install and start using immediately Supports MP3, M4A, WAV, FLAC, AAC and more.
Screenshots
Verdict
The clearest difference is price: KeyTempo at Free against 528 Player's $5.99. KeyTempo also leads on rating (5.0 vs 3.9) and in-app purchases (none vs 1). 528 Player's advantage is ratings volume (92 vs 1) and iOS requirement (14.0 vs 16.0). On ads 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
KeyTempo is free to download; 528 Player costs $5.99 up front. 528 Player sells 1 one-off in-app purchase. KeyTempo asks for nothing beyond the download.
KeyTempo holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: 528 Player has 92 ratings behind it against 1, so its average is the more settled of the two.
528 Player ships an update every 66 months, KeyTempo every 10 days. Both last shipped on October 24, 2026.
| Parameter | 528 Player | KeyTempo |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 3.9 (92 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 49.0% of reviews | — |
| Number of ratings | 92 — better | 1 |
| Update frequency | Every 66 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 22 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Ophir Paz | DONG CHEOL HAN |
Bugs and requests
528 Player
Reported bugs
10 issues- App crashes on opening
- App does not open
- Cannot import local music
- Some songs play with no sound
- Music cuts off at the end
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- App keeps crashing and kicking out
- Static sound
- Songs sound stereoed
- Doesn't rescan some music
- Crashes phone or home page loading
Requested features
9 requests- Add 639hz or 417hz frequencies
- Add 'Recently Added' option
- Add volume normalization, replay gain, peak adjustment, auto-stop
- Implement pitch control for -32 cents
- Continuous playback for albums
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- Alphabetical scrolling on the right side
- Add 963Hz player
- Improve equalizer
- Make layout similar to 432hz player
KeyTempo
Not enough reviews yet to summarise bugs or requests.
In-app purchases
528 Player
- 528Player Full Features$5.99
KeyTempo
No in-app purchases
