# Hi-Fi Audio :: Smart Compo

> iPhone audio component with digital filters, sound adjustments, and media playback. (iPhone/iPad app by Maiji Saito.)

- Source: https://appshunter.io/ios/app/hi-fi-audio-smart-compo/id1010518443 (this page in markdown: same URL + `.md`)
- Developer: [Maiji Saito](https://appshunter.io/developer/671719488)
- Category: Music, Productivity
- Price: Free with in-app purchases
- Rating: 4.20/5 from 64 App Store ratings · 51 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 4 MB
- Languages: American English, Japanese
- Released: 2015-07-01
- Data updated: 2026-08-16
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/hi-fi-audio-smart-compo/id1010518443/reviews.md

## What is Hi?

■ Features
The iPhone turns into an audio component.
With its own digital filter DSP, you can enjoy music with overwhelming presence.

■ Sound Function
□ Bus adjustment function: Highlights the bass.
□ Treble adjustment function: Highlights the vocal part and treble.
□ Reverb function: Gives the echo sound effect of the stadium.
□ Wide function: Produce spread of sound, richness.
□ 10 Band Equalizer: Adjust the fine tone quality.
□ Voice cancellation function: You can erase the voice of vocals.
□ Normalizer function: Automatically adjust the volume.
□ Movie Playing function: For files with movies, movies are also played.

■ Other functions
□ File sharing function: You can copy and play music files (mp3, mp4) from your computer using "File Sharing" in iTunes.
□ Reject exclusion function: You can prevent specific songs from playing from albums and so on.
□ Remote control function: You can operate from the remote control of the earphone.
□ Playlist function: You can select to play only one song, play back by album, play by artist, play all songs, play list, etc.
□ Timer (automatic stop) function: Playback can be stopped after a certain period of time.

■ Notes
Only audio data saved on the local terminal can be played. It can not be played with the iCloud music library.
On iOS 11, noise may get on during playback. Noise will not be applied to iOS12.

## Key features

- Digital filter DSP
- Bass and treble adjustment
- Reverb and wide sound effects
- 10 Band Equalizer
- Voice cancellation
- Local file playback (MP3, MP4)
- Playlist management

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Continuous playable option | $1.99 | one-time |


## Recent user reviews (10 of 51)

All indexed reviews: https://appshunter.io/ios/app/hi-fi-audio-smart-compo/id1010518443/reviews.md

### 5/5 — 課金できた！

*2026-02-22*

ずっと課金できず連続再生できなかったのがいつの間にか課金できるようになっていました
選曲は正直使いにくいですが音質は最高です

### 5/5 — 出会えて良かったと心から思えたアプリ

*2026-01-13*

探していた物にようやく出会えた感動がありました。
ワイド機能による臨場感。エコーかけるだけでサラウンド機能を謳っているそこらのアプリなんか目じゃない確かな変化を感じられます。
イコライザーのシークバー操作の際に微調整が難しいのだけが難点ですが、個人的にはそれを補って余りある機能満載のアプリです。
iOSのアップデートでいつか使えなくなるかもしれないのが不安ですが、その日までずっと使い続けたい。
製作者に心から感謝を。

### 2/5 — iPhoneXでは完璧には動かないのかな

*2025-08-01*

曲リスト(音符のアイコン)をタップするとフリーズしてしまい画面遷移が困難。かなり低い確率で遷移できることがあるけどタップしてから数分待ってようやく成功する。曲の変更が困難ですが、音には満足なので引き続き色々試しながら使ってみます。

### 4/5 — 使いやすいアプリ

*2025-04-17*

簡単で分かりやすく音の響き方を変えれます。
細かな調整のできるイコライザー機能もあり、いくつかのパターンがあらかじめ設定されていて自由にいじれますが
指スライドで調整する為狙った所に合わせづらい時があります。
数値を入力できるともっと細かく調整できると思いました。

あとたまにイコライザーの初期化ボタンを押してしまい、AllリセットしてしまうこともあるのでMy設定でリセットされないイコライザーも欲しいです。

### 1/5 — 以前購入したのに解除出来ない💦

*2025-03-08*

iTunesで曲を購入してiPhone11でいつも聴いていますが、しかし、再生機能制限解除で、解除する（以前購入したことのある方）をタップしても、一曲毎に再生しなければ、再生出来ない‼️
なので、このアプリは二度と使用すらしたくない‼️
おすすめは出来ない‼️

### 5/5 — Papa Joe

*2024-09-27, version 4.33*

It crashes when you click purchase. But it’s best player

### 2/5 — The app does not work properly

*2024-09-15*

It only plays one song at a time unless I purchase the app. When I try to purchase it the link fails and I cannot purchase it. Who can help to solve this problem.

### 2/5 — 課金できない

*2024-05-18*

とても良いアプリなので課金したいのですが、アプリが落ちてしまいます。

### 4/5 — 購入できません。

*2023-08-23*

初めまして。
音が気に入りましたので、購入しようと
したのですが、何度も試しても
クラッシュして購入できません。
ご対応よろしくお願いします。　
環境は
iPhone12
iOS16.6
です。

### 4/5 — Excellent Player!

*2022-12-06, version 4.33*

Hi I bought this app, please add functionality of playing music files from my iPhone’s local folder. Many thanks.

## Frequently asked questions about Hi

### What does the Hi-Fi Audio :: Smart Compo app do?

This app transforms your iPhone into a high-fidelity audio component. It offers a digital filter DSP for an immersive sound experience and a variety of sound adjustment functions to customize your audio playback.

### What are the key sound adjustment features?

The app includes a bus adjustment for bass, a treble adjustment for vocals, a reverb function for echo effects, a wide function for sound spread, and a 10-band equalizer for fine-tuning tone quality. It also features a voice cancellation function to remove vocals and a normalizer to automatically adjust volume.

### How much does Hi-Fi Audio :: Smart Compo cost?

The application is free to download and use, but it offers in-app purchases for additional features or content. Specific pricing for these in-app purchases can be found within the app itself.

### What kind of audio files can I play with this app?

You can play audio files such as MP3 and MP4 that are saved locally on your iPhone. The app also supports playing movie files. It is important to note that it cannot play music from the iCloud Music Library.

### Can I use this app to play music from my computer?

Yes, you can copy music files (mp3, mp4) from your computer to your iPhone using the 'File Sharing' feature in iTunes. Once transferred, these files can be played and managed within the app.

## Version history (last 5 releases)

### 4.33 — 2019-09-20

・Support for iOS13.

### 4.32 — 2019-07-04

Fixed a minor bug.

### 4.31 — 2019-01-23

・Fixed playlist bugs.

### 4.30 — 2019-01-18

・Fixed bugs.

### 4.29 — 2019-01-15

・Fiexd bugs.

## Apps similar to Hi

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [scylla - Hi-Res Music Player](https://appshunter.io/ios/app/scylla-hi-res-music-player/id1213793301) | 4.4 (128) | Free | Music |
| [Onkyo HF Player - Hi-Res Music](https://appshunter.io/ios/app/onkyo-hf-player-hi-res-music/id704139896) | 3.3 (198) | Free | Music |
| [EQ Reverb hd Music app ETMusic](https://appshunter.io/ios/app/eq-reverb-hd-music-app-etmusic/id1469671091) | 4.4 (179) | Free | Music |
| [music player-NePLAYER Lite](https://appshunter.io/ios/app/music-player-neplayer-lite/id1047053453) | 4.3 (36) | Free | Music |
| [ChannelEqualizer](https://appshunter.io/ios/app/channelequalizer/id1513527511) | 4.0 (22) | Free | Music |
| [EQ560](https://appshunter.io/ios/app/eq560/id1486125569) | 3.7 (30) | Free | Music |

## More apps by Maiji Saito

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- [危険物取扱者乙種第四類Lite](https://appshunter.io/ios/app/lite/id690557389)
- [基本情報技術者試験問題集](https://appshunter.io/ios/app/id716625312)
- [タクシーメーター](https://appshunter.io/ios/app/id738209600)

All apps by Maiji Saito: https://appshunter.io/developer/671719488

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-16.*