isfizz vs VAPolyMkII
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
isfizz
This app plays SFZ files, an open format for sampled sound instruments. It supports various audio file formats, MIDI, and Scala tuning files. It also functions as an Audio Unit Extension (AUv3) for use with other music apps.
- SFZ file playback
- Audio Unit Extension (AUv3) support
- Edit SFZ strings
- Load SFZ files in place
- Scala tuning file support
- MIDI support
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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.
VAPolyMkII
This virtual analog synthesizer offers a 16-voice bitimbral polyphonic sound engine with two distinct filter models and extensive modulation options. It includes a built-in sequencer, various effects, and supports AudioUnit Extension for integration with DAWs. Projects can be synced across iPhone, iPad, and Mac via iCloud.
- 16-voice bitimbral polyphonic synthesizer
- Two analog-modeled filter types
- Extensive modulation capabilities
- Built-in piano roll sequencer
- Multiple audio effects
- AudioUnit Extension (AUv3) support
- iCloud Drive project syncing
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VAPolyMkII is a virtual analog bitimbral polyphonic synthesizer for iPhone, iPad and Mac. It features 16 voice synthesizer, effects, sequencer and audio visualization tools. It operates as a stand alone or as an AudioUnit Extension (AUv3). Stand Alone supports Ableton Link, MIDI and audio file export. The synthesizer consists of two 8 voice synthesizer, which features two oscillators, two ADSR envelopes, resonant high pass and low pass filter and an amplifier per voice. The oscillators features continuously variable wave shape and wide variety of modulation. The filters are modeled on the Sallen-Key filter circuit and cascaded OTA filter circuit for classic analog sound. The Effects include delay, chorus, flanger, reverb, eq and compressor. The sequencer features piano roll and parameter automation editor to program 16 bar pattern per clip. Project files can be saved in iCloud Drive, so that the project can be accessed from iPhone, iPad or Mac. - Main Features - Virtual analog 16 voice bitimbral polyphonic synthesizer Two type of Lowpass filter, cascaded OTA model and Sallen-key model. Patch points for modulation. Support MIDI 2.0 New User Interface built by SwiftUI for improved performance. Built-in Sequencer. 16 bar patterns per clip. Total 8 clips. Piano Roll and Parameter automation. Support Audio Unit Extension (AUv3) Works on iPhone, iPad and Mac. Support iCloud Drive to share project files between the platforms. Audio Export. Linear PCM format (AIFF, WAV and CAF) and compressed format (AAC) Support Ableton Link, Bluetooth MIDI, MIDI In / Out. - System Requirements - A13 Fusion or above is recommended. AudioUnit Extension (AUv3) requires host application which support AudioUnit Extension. AudioUnit Extension is supported by Apple Logic and Apple Garage Band on iOS and macOS. For any other DAW, it depends on the application and some of them don’t support AudioUnit Extension.
Screenshots
Verdict
The clearest difference is price: isfizz at $2.99 against VAPolyMkII's $14.99. isfizz also leads on review sentiment (100% vs 67%) and rating (4.7 vs 4.5). VAPolyMkII's advantage is update cadence (weekly vs fortnightly). On ratings volume, ads, in-app purchases and monetization model 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
isfizz costs $2.99 and VAPolyMkII $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
isfizz holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 14 and 11 respectively. Written reviews point the same way: 100% of isfizz's written reviews are positive against 67% of VAPolyMkII's.
isfizz ships an update fortnightly, VAPolyMkII weekly. The most recent releases landed on October 9, 2026 and October 19, 2026 respectively.
| Parameter | isfizz | VAPolyMkII |
|---|---|---|
| Price | $2.99 — better | $14.99 |
| Rating | 4.7 (14 ratings) — better | 4.5 (11 ratings) |
| Positive reviews | 100.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 14 — better | 11 |
| Update frequency | Fortnightly | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 15.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 6 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryouta Kira | Ryo Togawa |
Customer experience
isfizz
VAPolyMkII
In-app purchases
isfizz
No in-app purchases
VAPolyMkII
No in-app purchases







