Kompresor vs VAPolyFM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kompresor
This audio tool offers versatile compression with multiple algorithms and processing modes for various signals, from mix bus to mastering. It provides fine-tuning options like DELTA monitoring and external sidechaining for precise audio manipulation.
- Multiple compression algorithms
- Five processing modes (stereo, mid, side, left, right)
- External sidechain input
- DELTA monitoring
- Fast attack time (0.01ms)
- Peak and RMS detectors
- AUv3 plugin compatibility
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Kompresor is a versatile and powerful, yet easy to use, compressor. With several compression algorithms and processing modes under the hood, Kompresor is suitable for use on a wide variety of signals, on the mix bus, or for mastering. For the most transparent compression, ideal for mastering, use AUTO or "AUTO A" envelopes. Use PROGRAM envelope for an easy mix bus gluing effect. If you are after the classic style compression switch to feedback configuration. Select RMS detector for a smoother compression suitable for vocals, guitars, etc. Five processing modes allow you to go from the standard stereo (L/R) compression mode to more surgical modes like compressing the mid (sum) or side (diff) signal only, or compressing exclusively the left or right channel. To help you fine tune compression parameters, enable DELTA feature to monitor only the difference between the uncompressed and compressed signal. Last but not least, Kompresor has an external side chain input for those times when you need to duck one signal based on another one. Features: – Four types of compression Attack/Release envelopes SIMPLE, AUTO, AUTO A, and PROGRAM. – Five processing modes LEFT, RIGHT, MID, SIDE, STEREO – External sidechaining (only in hosts that support external sidechaining) – Very fast attack time - 0.01ms – Ratio up to 30:1 – Soft knee up to 50dB width – Feedforward and feedback configuration – Peak and RMS detectors – Sidechain high pass filter – Parallel processing – Monitoring only the difference between the uncompressed and compressed signal – Intelligent auto makeup gain – 4x oversampling to avoid aliasing – Plenty of factory presets to provide a starting point Kompresor is primarily an AUv3 effect. To use Kompresor as a plug-in, you will need an AUv3 compatible host such as Garageband, AUM, etc. Kompresor application is there to provide a user manual and a chance to use Kompresor with the microphone input. You can try Kompresor on a macOS or a Windows based machine by downloading the demo version of the plug-in (VST3, AUv2, AAX) from our website (https://www.shatteredglassaudio.com) and running it in a DAW of your choice. Sonically speaking there are no differences between the iOS and macOS/Windows versions of Kompresor.
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
The clearest difference is price: VAPolyFM at $14.99 against Kompresor's $24.99. Kompresor's advantage is rating (5.0 vs 4.5) and update cadence (every 8 months vs every 17 months). 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
Kompresor costs $24.99 and VAPolyFM $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Kompresor holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 3 and 6 respectively.
Kompresor ships an update every 8 months, VAPolyFM every 17 months. The most recent releases landed on September 16, 2026 and September 21, 2026 respectively.
| Parameter | Kompresor | VAPolyFM |
|---|---|---|
| Price | $24.99 | $14.99 — better |
| Rating | 5.0 (3 ratings) — better | 4.5 (6 ratings) |
| Positive reviews | — | 16.7% of reviews |
| Number of ratings | 3 | 6 — better |
| Update frequency | Every 8 months — better | Every 17 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 15.8 — better | 16.6 |
| Further details — not scored | ||
| Size | 4 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Shattered Glass Audio | Ryo Togawa |
Customer experience
Kompresor
VAPolyFM
In-app purchases
Kompresor
No in-app purchases
VAPolyFM
No in-app purchases








