# isfizz — SFZ player / AUv3 plugin

> SFZ file player and AUv3 plugin for sampled instruments. (iPhone/iPad app by Ryouta Kira.)

- Source: https://appshunter.io/ios/app/isfizz/id6470708963 (this page in markdown: same URL + `.md`)
- Developer: [Ryouta Kira](https://appshunter.io/developer/862984358)
- Category: Music
- Price: $2.99
- Rating: 4.70/5 from 14 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 6 MB
- Languages: American English
- Released: 2024-01-02
- Data updated: 2026-09-05
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/isfizz/id6470708963/reviews.md

## What is isfizz?

isfizz is a SFZ file player.
SFZ is an open text format for sampled sound instruments. This app can load SFZ and play the instrument.

- Includes Audio Unit Extension (AUv3).
- You can edit SFZ string.
- The app loads SFZ files in place without copying the files.
- Double tap to enter the value, triple tap to reset.
- Supports Scala tuning files (.scl).
- Supports MIDI.
- Supports 16 out. use the "output=N" opcode in SFZ.

Supported sample file format:
- .wav (raw PCM)
- .aiff
- .mp3
- .flac
- .ogg (vorbis)
- .wv (wavpack)

This app is an iPhone/iPad port of sfizz-ui project.
The app is made from some sfizz-ui codes and images.
About half of the income from this app will be donated to SFZ Tools team.

This app and the description contain machine translated text.

## Key features

- SFZ file playback
- Audio Unit Extension (AUv3) support
- Edit SFZ strings
- Load SFZ files in place
- Scala tuning file support
- MIDI support

## Chart rankings

- #187 in Top Paid · Music (US App Store)

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/isfizz/id6470708963/reviews.md

### 5/5 — Was confused at first but nice software

*2026-04-09*

Does the trick. Thanks for clarifying

**Developer response:** isfizz doesn't load "Soundfonts" but it does load "SFZ". The two are different formats.

### 4/5 — Muito Bom, mas não está funcionando no Logic.

*2025-11-07*

Mesmo após a recente atualização. continua sem funcionar no Logic e agora Auria pro, que com a anterior estava funcionando. Somente funciona no cubase!

**Developer response:** Infelizmente, não posso resolver o problema no Auria. Isso ocorre porque, quando a caixa de diálogo de seleção de arquivos é aberta, os eventos de toque não são recebidos por este aplicativo.
Suspeito que seja um problema do iOS/iPadOS, mas a probabilidade de a Apple resolvê-lo é baixa.
O problema no Logic Pro é o mesmo que no Auria? Como não paguei pelo Logic Pro, não posso verificar isso.

### 5/5 — Best and only SFZ player

*2025-01-04*

If I'm not mistaken this is the only option for playing SFZ files on iOS, and it does a great job at it. Everything I've tried in Sforzando works here like amplitude and locc/hicc opcodes. Only change I'd suggest is to combine the first and 3rd screens so that all CC controls are on the first page. I often have to switch the SFZ file i''m using and it would be less clicking around if all the CC dials were on the home page. Good job!

### 5/5 — Top notch sfz player

*2024-06-16*

An excellent SFZ file player. The interface is simple but elegant and powerful, and it’s easy to load a custom background image by editing the SFZ file, which is also easy within the app. Support for external storage is a nice feature and I’ve loaded up SFZ’s up to 2 GB with no problems. Works well as an AUv3 in AUM and other hosts. Also supports key switches and custom tuning files. Really nice.

### 5/5 — SFZは良質なサウンドの宝庫

*2024-01-04*

このisfizzをCubasis 3のAudio Unitとして立ち上げて、Auria Proの純正サンプラー『Lyra』のライブラリー（.sf2と.sfzと.exsが混在）の中のSFZファイルを読み込んで鳴らしてみました（ファイルアプリ＞このiPad内＞Auria Pro＞Sampler Instruments＞楽器フォルダ内。自分はiCloud Driveに上げてあるのでそちらから読み込みました・・・がiCloudからの読み込みが若干不安定だったので結局¨このiPad内¨にSFZフォルダを作成してそちらへ移植しました）。特にお目当てだったのはFreeライブラリーのSalamander Grand Piano（16/44.wav、3鍵毎16ベロシティレイヤー+α、1.2GB）このピアノをCubasis 3で扱えたら最高だな、と。そうしたら当然ですが、ちゃんと鳴りました。感動。理屈上ではとっくに結論は出ていて、丁寧にサンプリングされたwavを、出来るだけサウンドが脚色されていない素直なサンプラーで鳴らせば一番良いサウンドが出るのは当たり前で、それを可能にしてくれるのがisfizzだと思います。isfizzで鳴らしたSalamander Grand Pianoは『Lyra』で鳴らすのとはまた一味違う純粋なサウンドでした（いかにもwavがそのまま鳴っている感じ。楽器として使うなら『Lyra』で鳴らす方がサウンドが太く濃厚で奥行きもありますが、楽曲の中で煌めくように使いたいならisfizzの方が合うかも。Auria ProのAudio Unitとして使う場合でも）。とりあえず、iOSでこんなピアノサウンドを鳴らせる時代になったことをとても嬉しく思います（それにしても発売された当初のCubasis 3の出音はひどかったですが、途中で大幅な見直しがあったようで、現在はとても良い音になりました）。ところでCubasis 3でisfizzトラックをフリーズしてみたところ、音量とサウンドのクオリティーが随分下がります。どちらの問題なのでしょうか？ 更にエクスポートでは無音になってしまいました。また素朴な疑問ですが、サウンドに拘って少し設定を弄ってみた結果、個人的には［レンダリングクオリティー ; Linear、チェック全外し］が¨鳴り¨が最もピュアで好みだったのですが、何故、Add reverb opcodes等のチェックがサウンドに影響を与えるのだろう？ と少々不思議には感じました。設定では他には、キートランスポーズ、オーバーサンプリング、基準周波数（440Hz以外にも、380、409、415、422.5、423.2、435、439、442、445、451）、各音セント単位でピッチ調整が可能なので純正律も（きっと）OK。それにしても本当にハズレの無いデベロッパーさんです。また今回も素晴らしい！

**Developer response:** 高評価レビューありがとうございます。
Cubasis 3でテストしたところ、フリーズで音質が劣化するのは原因不明です。試しにsfizzエンジンにオフラインレンダリングを伝えないように変更しても、劣化しました。他のオフラインレンダリングに特有の処理は、処理待ちが追加される、というものですが、これが音質に影響するとは考えにくいです。この待つ処理を次のバージョンで改善する予定です。

また、ミックスダウン時にisfizzがクラッシュする現象を確認しましたので、修正いたします。

Add reverb opcodesは、SFZに自動的にリバーブを追加する、という機能ですので、音に影響します。

大変長文の高評価レビューで、恐縮です。これからもご愛顧のほど、よろしくお願いいたします。

### 5/5 — Excellent App

*2024-01-03*

This is really an exceptional music app! Seamless user interface, and intuitive features make it a standout choice. Whether discovering new tunes or creating playlists, this app delivers a premium listening experience. A must-have for music enthusiasts

## Frequently asked questions about isfizz

### What is isfizz?

isfizz is a mobile application designed to play SFZ files, which are a format for sampled sound instruments. It allows users to load and play these instruments directly on their iPhone or iPad.

### What file formats does isfizz support for samples?

isfizz supports a wide range of sample file formats including .wav, .aiff, .mp3, .flac, .ogg (vorbis), and .wv (wavpack).

### Can isfizz be used with other music apps?

Yes, isfizz includes Audio Unit Extension (AUv3) support, allowing it to be used as a plugin within other compatible music creation applications on iOS.

### Does isfizz support MIDI input?

Yes, isfizz fully supports MIDI input, enabling users to control the loaded instruments with external MIDI controllers or other MIDI sources.

### How does isfizz handle SFZ files?

isfizz loads SFZ files in place without copying them to the app's storage. It also allows users to edit SFZ strings directly within the app.

### What is the price of isfizz?

isfizz is a paid application available for $2.99. A portion of the income generated from this app is donated to the SFZ Tools team.

### What devices is isfizz compatible with?

isfizz is compatible with iPhone, iPad, and iPod devices. It has an age rating of 4+.

### How often is isfizz updated?

The latest version of isfizz is 1.4, which was last updated on March 24, 2026. This indicates a recent update, suggesting ongoing development and support.

## Version history (last 5 releases)

### 1.4.2 — 2026-08-26

- The master volume has become adjustable.
- Fixed an issue that made the volume +1.0dB when loading the saved state.

### 1.4.1 — 2026-07-07

Fixed an issue where the key switch state was not saved when selected from the drop-down list.

### 1.4 — 2026-03-24

Added the minimum note duration settings. Useful for electric drums.

### 1.3.19 — 2026-03-21

The preferred UI size for the plugins has been set.

### 1.3.18 — 2025-10-22

I've adjusted the appearance when text size is changed in iPhone/iPad settings.
Other fixes.

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## More apps by Ryouta Kira

- [KQ MiniSynth Legacy](https://appshunter.io/ios/app/kq-minisynth-legacy/id1070850573)
- [KQ Dixie Legacy](https://appshunter.io/ios/app/kq-dixie-legacy/id1330269027)
- [MIDI Recorder with E.Piano](https://appshunter.io/ios/app/midi-recorder-with-epiano/id1448577506)
- [KQ Unotone Legacy](https://appshunter.io/ios/app/kq-unotone-legacy/id1478535391)
- [Piano Modoki](https://appshunter.io/ios/app/piano-modoki/id1509387368)
- [KQ Sampei Legacy](https://appshunter.io/ios/app/kq-sampei-legacy/id1626784865)

All apps by Ryouta Kira: https://appshunter.io/developer/862984358

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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 2026-09-05.*