Comparison

Kalliopeia vs 528 Player Plus

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

Head to head
About

Kalliopeia

Experience your music in stunning detail with this high-resolution audio player. It supports a wide range of formats, offers advanced upsampling capabilities, and includes a powerful 11-band equalizer to customize your sound. Enjoy gapless playback, playlist creation, and more.

Highlights
  • High-res audio playback (DSF, DSD, FLAC, WAV, AIFF, ALAC, AAC, MP3)
  • Audio upsampling to 192kHz
  • 11-band equalizer with presets
  • Gapless playback
  • Playlist creation and waitlist
  • Last.fm scrobbling
Features
Read full description

Kalliopeia is a high resolution music player app. Features: 1. High-res audio playback Supports up to 5.6MHz DSD and 384kHz PCM high-res audio. Capable of playing song synced to your iTunes. Compatible Formats  - DSF / DIFF  - FLAC  - WAV / AIFF  - ALAC(Apple Lossless)  - AAC  - MP3 * A device with a portable amp or other function that supports high resolution is required to output high-res audio at its original quality. Headphones plugged directly into a headphone jack will output at 44.1kHz or 48kHz. * To play DSD files, you need a DAC that supports DSD over PCM (DoP). 2. Converts standard audio files to high-res using upsampling Kalliopeia links to your connected device to provide upsampling and playback at up to 192kHz. * Kalliopeia has a fairly high CPU utilization rate, so your battery may drain faster when it is in use. 3. Built-in 11-band equalizer for bringing out that high-res power Built-in 32Hz~32000Hz 11-band equalizer. Use the 20 stock presets, or create and save your own settings. You can also assign settings for each musical genre. 4. Additional Features - Gapless Playback  - Create playlists  - Enter the next songs to listen to with "Play Waitlist"  - Save your listening history (up to 20 songs)  - Shuffle, repeat  - Post what you are listening to on Twitter and other social networks  - Override screen auto-lock during playback  - The Last.fm Scrobbling feature

About

528 Player Plus

This app retunes your entire music library to the 528 Hz Solfeggio frequency in real-time. Experience your favorite songs with a new sense of harmony and restoration without altering original files. A free trial is available before a one-time purchase unlocks unlimited listening.

Highlights
  • Real-time 528 Hz retuning
  • Supports entire music library
  • Distraction-free interface
  • One-time purchase unlock
  • Free trial for 20 songs
Features
Read full description

What if your favorite music could sound and feel different — not by changing what you hear, but by shifting the frequency beneath it? 528 Player Plus retunes any song from your library to 528 Hz — the Solfeggio frequency associated with harmony, restoration, and the natural resonance of living systems — in real time, as it plays. No exports. No waiting. No audio files to manage. Just press play. HOW IT WORKS Most modern music is mastered at 440 Hz, the global standard tuning. 528 Player Plus shifts the playback frequency of your existing music library to 528 Hz on the fly — so every song you already love plays at this resonant frequency without altering your original files. WHAT YOU GET Real-time 528 Hz retuning of your full music library Clean, distraction-free player interface No subscriptions — pay once, own it forever Try free: retune up to 20 songs before unlocking $19.99 one-time unlock — no recurring charges, ever Works with your existing owned music files WHO IT'S FOR → Sound healers and frequency practitioners → Meditators and breathwork enthusiasts → Anyone curious about Solfeggio frequencies → Musicians exploring alternate tuning systems → People who want their music to feel different — not just sound different WHY 528 Hz? 528 Hz sits within the ancient Solfeggio scale — a set of tones used in sacred music across cultures for centuries. Modern researchers and sound practitioners have associated this frequency with feelings of clarity, calm, and coherence. Whether you approach it scientifically or intuitively, the experience speaks for itself. Try it with music you already know by heart. You may be surprised. FREE TO TRY. YOURS TO KEEP. Retune your first 20 songs completely free. When you're ready, a single $19.99 purchase unlocks unlimited listening — forever. No subscription. No renewal. No fine print.

Screenshots

Kalliopeia3 screens
528 Player Plus4 screens

Verdict

The call

The clearest difference is review sentiment: Kalliopeia at 50% against 528 Player Plus's 0%. Kalliopeia also leads on rating (3.5 vs 1.0) and in-app purchases (none vs 10). 528 Player Plus's advantage is price (Free vs $4.99) and device support (3 vs 1). On ratings volume, update cadence and ads 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

528 Player Plus is free to download; Kalliopeia costs $4.99 up front. 528 Player Plus sells 10 one-off in-app purchases. Kalliopeia asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Kalliopeia holds the better App Store score, 3.5 against 1.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 50% of Kalliopeia's written reviews are positive against 0% of 528 Player Plus's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 11, 2026 and October 30, 2026 respectively.

Scorecard7 real differences · 3 level
Kalliopeia versus 528 Player Plus: the parameters behind the verdict, then further details
ParameterKalliopeia528 Player Plus
Price$4.99Free — better
Rating3.5 (2 ratings) — better1.0 (2 ratings)
Positive reviews50.0% of reviews — better0.0% of reviews
Number of ratings22
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS26.015.6 — better
Further details — not scored
Size2 MB79 MB
Age rating4+4+
DeveloperYU HASHIZUMESYQEL INC

Customer experience

Kalliopeia

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

528 Player Plus

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Kalliopeia

No in-app purchases

10 purchases

528 Player Plus

One-time10
  • Unlimited 528 Hz retuning forever.$19.99
  • Frequency - 285 Hz$19.99
  • Frequency - 432 Hz$19.99
Show 7 more
  • Frequency - 396 Hz$19.99
  • Frequency - 741 Hz$19.99
  • Frequency - 174 Hz$19.99
  • Frequency - 417 Hz$19.99
  • Frequency - 639 Hz$19.99
  • Solfeggio Core Bundle$59.99
  • All Frequencies$99.99

Questions

Is Kalliopeia free?
Kalliopeia costs $4.99, with no in-app purchases.
Is 528 Player Plus free?
528 Player Plus is free to download, with in-app purchases available.
Which has better reviews, Kalliopeia or 528 Player Plus?
Kalliopeia is rated higher. Kalliopeia averages 3.5 out of 5 from 2 ratings, while 528 Player Plus averages 1.0 from 2 ratings.
Do Kalliopeia or 528 Player Plus have ads?
Neither Kalliopeia nor 528 Player Plus shows ads.
Which is updated more often, Kalliopeia or 528 Player Plus?
Kalliopeia ships an update every 2 months, and 528 Player Plus every 2 months. Most recently, Kalliopeia was updated on November 11, 2026 and 528 Player Plus on October 30, 2026.

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