VOLT Synth vs VAPolyFM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VOLT Synth
This app is a virtual analog synthesizer designed for expressive sound creation. It supports multidimensional polyphonic expression (MPE) and offers a variety of synth voice features, built-in effects, and keyboard layouts. It's compatible with MPE hardware and software, as well as standard MIDI controllers.
- Virtual analog synthesizer
- Multidimensional Polyphonic Expression (MPE)
- Expressive synth engine
- Multiple keyboard layouts
- Built-in stereo effects
- 100+ factory presets
- Standalone and AUv3 support
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VOLT is a virtual analog synthesizer designed to create classic synth sounds while emphasising expressive play. With full support for multidimensional polyphonic expression (MPE) - VOLT is a great companion to any Seaboard player. Overview: * Polyphonic Virtual Analog Synthesizer * Expressive synth engine with MPE, poly-, channel aftertouch & 4D touch keyboard * 5 Keyboard Layouts (Classic, Uniform, String, Scale & Chord) * Built-in stereo effects * 100+ fine tuned factory presets * Supports ROLI Seaboard, LinnStrument, Geoshred and others out of the box * Standalone operation with support for USB audio interfaces, wired, network & bluetooth MIDI * Audio Unit v3 Extension * Inter App Audio support * Audiobus support * Ableton Link Synth Voice: * Variable waveshape * Variable pulse-width (on all waves) * Detunable sub & noise source * SEM style state-variable filter * LFO per voice * Dual ADSR * Poly drive (per voice distortion) * 8x Polyphony / Unison * Detune / Slop * Pan Spread * Arpeggiator Effects: * 3x stereo effect units * Vintage Chorus * Digital Delay (syncable) * Epic Reverb Input/Expression: * MPE MIDI hardware including but not limited to ROLI Seaboard Rise, Seaboard Block, Lightpad Block * MPE MIDI software including but not limited to Geoshred, Geoshred Control * Regular MIDI keyboards featuring channel or poly aftertouch, pitch- and mod wheels * Onscreen 2D Touch Keyboard (supports slide and glide) * Plain MIDI Input Presets: * Factory bank including 100+ expressive presets ready to play out of the box * Preset Management with Templates & Categories * Shared User Presets between Standalone and AUv3 versions * Preset Export & Import via Files.app, Airdrop etc. * iCloud Drive Support Connectivity: * Standalone * AUv3 Instrument * Inter-App Audio Instrument * Audiobus Instrument
VAPolyFM
Create music with a versatile hybrid synthesizer offering both FM and virtual analog subtractive synthesis. Explore a wide range of effects, a built-in sequencer, and extensive MIDI support. Save and share projects seamlessly across iPhone, iPad, and Mac.
- FM synthesizer with 6 operators
- Virtual analog subtractive synthesizer
- Built-in effects (delay, chorus, reverb)
- Sequencer with piano roll editor
- AudioUnit Extension (AUv3) support
- Ableton Link and MIDI 2.0 support
- iCloud Drive project sharing
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VAPolyFM is a hybrid polyphonic synthesizer for iPhone, iPad and Mac. It features FM synthesizer and subtractive synthesizer. It operates as a stand alone or as an AudioUnit Extension (AUv3). Stand Alone supports Ableton Link, MIDI and audio file export. FM synthesizer features 6 operators and 32 algorithm and it is inspired by FM synthesizers of the 1980’s. Virtual analog subtractive synthesizer features two oscillators, resonant high pass filter, resonant low pass filter and two ADSR envelopes per voice. Built-in Effects include delay, chorus, flanger, reverb, eq and compressor. VAPolyFM also includes sequencer which features piano roll editor and parameter automation. Project files can be saved in iCloud Drive, so that the project can be accessed from iPhone, iPad or Mac. - Main Features - FM Synthesizer. 6 operators and 32 algorithm. Virtual analog subtractive synthesizer. Maximum 8 voice polyphony. it depends on performance of the device it is running. Built-in effects and sequencer. Support MIDI 2.0 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. Includes 139 Factory Presets - 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. Sound may be distorted if CPU of the device doesn't have enough power. If it happens reduce number of voices.
Screenshots
Verdict
VOLT Synth and VAPolyFM both sit at 4.6 stars, but that hides the real split: 63% of VOLT Synth's written reviews are positive against 17% of VAPolyFM's. VOLT Synth also leads on update cadence (every 2 weeks vs every 17 months) and ratings volume (193 vs 6). VAPolyFM's advantage is in-app purchases (none vs 3) and price ($14.99 vs $19.99). On rating, 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
VOLT Synth costs $19.99 and VAPolyFM $14.99 up front. VOLT Synth sells 3 one-off in-app purchases. VAPolyFM asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.6 for VOLT Synth against 4.5 for VAPolyFM. That said, the two scores are not equally well evidenced: VOLT Synth has 193 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 63% of VOLT Synth's written reviews are positive against 17% of VAPolyFM's.
VOLT Synth ships an update every 2 weeks, VAPolyFM every 17 months. The most recent releases landed on September 20, 2026 and September 21, 2026 respectively.
| Parameter | VOLT Synth | VAPolyFM |
|---|---|---|
| Price | $19.99 | $14.99 — better |
| Rating | 4.6 (193 ratings) — better | 4.5 (6 ratings) |
| Positive reviews | 62.9% of reviews — better | 16.7% of reviews |
| Number of ratings | 193 — better | 6 |
| Update frequency | Every 2 weeks — better | Every 17 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 9.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 92 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | Ryo Togawa |
Customer experience
VOLT Synth
VAPolyFM
Bugs and requests
VOLT Synth
Reported bugs
18 issues- No MIDI input after 30 seconds
- Crashing when using multiple AU instances
- Presets disappear after iOS 14 update
- Standalone mode broken on recent iOS
- AU3 not working in Cubasis/NanoStudio 2
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- Crashes with iCloud Drive for patch storage on iOS 13
- Preset scroller not accessing sounds
- Stability issues on iOS 12
- UI issues in AU mode on iPhone
- No sound after last update
- Presets not loading
- AUv3 UI lacks preset selection slot
- Preset saving crashes app
- Digital readout under controls obscured by finger
- Latched key graphic disappears
- Legato mode doesn't work with aftertouch
- Pitch bend limited to 12 steps
- Global pitch bend setting disappeared
Requested features
7 requests- Two fields for sound forward/backward
- New features and sounds for MPE
- Dedicated strings section in presets
- Randomize function for LFOs/envelopes
- Larger fonts in preset display
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- Improve envelope snappiness
- Improve modulation routing options
VAPolyFM
Not enough reviews yet to summarise bugs or requests.
In-app purchases
VOLT Synth
- Dub PackFree
- haQ attaQ paQ$3.99
- Red Sky Lullaby Pack$3.99
VAPolyFM
No in-app purchases









