TerribleSync vs VAPolyFMWest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TerribleSync
Control the tempo of music hardware like synthesizers and drum machines using your iPhone or iPad. Features include tap tempo, precise dial adjustment, and buttons for performance effects. Requires a 3.5mm audio cable for connection.
- Tap tempo
- Rotary tempo dial
- Pause/mute button
- Performance effect buttons
- Clear interface
- Open source project
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Use your iPhone or iPad to control the tempo of impulse-sync-enabled synthesizers, drum machines, and other music hardware. Features: • Tap tempo • Supports 20.0 - 999.0+ BPM • Rotary tempo dial for precise, tactile tempo adjustment • Pause/mute button • ?, !, and :fire: buttons to introduce character and chaos into your performance • Clear, simple interface designed to be easy to use in a stage/performance setting This app works with any instrument you own that takes voltage impulses as a tempo control, such as: • KORG SQ-1, Volca, Monotribe, etc. • Teenage Engineering Pocket Operator • Moog MOTHER-32 (choose the "single clock advance" setting on the instrument) This project is open source. Try building it yourself at https://github.com/terribleben/terrible-sync or contact twitter.com/terribleben with feedback! Notes: • 3.5mm audio cable is required to connect your iPhone or iPad to your sync-enabled instruments. • If the instrument isn't responding, you may need to increase the iPhone's volume. • This software is not produced by, endorsed by, or affiliated with KORG, Teenage Engineering, Moog Music, or other instrument manufacturers.
VAPolyFMWest
This app combines FM and West Coast synthesis with a 4-operator FM engine and wave folder/lowpass gate. It offers a standalone mode with Ableton Link and MIDI support, plus an AudioUnit Extension for iOS and Mac. Includes built-in effects and a step sequencer.
- 4-operator FM synthesizer
- Wave folder and lowpass gate
- AudioUnit Extension (AUv3) support
- Ableton Link and MIDI connectivity
- Built-in delay, chorus, reverb, EQ, compressor
- 3-channel step sequencer
- iCloud Drive project sharing
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VAPolyFMWest is a combination of FM and West Coast synthesis. It features 4 operator, 8 waveform, 8 algorithm FM synthesizer inspired by iconic rack mount FM synthesizer in 1980’s and wave folder and lowpass gate, which are key components of the west coast synthesis. VAPolyFMWest operates as a stand alone or as an AudioUnit Extension (AUv3) for iPhone, iPad and Mac. Stand Alone supports Ableton Link, MIDI and audio file export. Built-in Effects include delay, chorus, flanger, reverb, eq and compressor. Project files can be saved in iCloud Drive, so that the project can be accessed from iPhone, iPad or Mac. Main Features - FM Synthesizer - 4 operators, 8 waveforms and 8 algorithms - Wave folder and lowpass gate - 3 channel analog style step sequencer. - Maximum 8 voice polyphony. it depends on performance of the device it is running. - Built-in effects and piano roll sequencer. - Audio Export. Linear PCM format (AIFF, WAV and CAF) and compressed format (AAC) - Support Audio Unit Extension (AUv3). - Support MIDI 2.0. - Support Ableton Link, Bluetooth MIDI, MIDI In / Out. - Works on iPhone, iPad and Mac. Support iCloud Drive to share project files between the platforms. - Support MIDI Foot Pedal (CC#11, CC#64) - MIDI CC Settings are saved. It will be recovered when the app launched in the next time. - UI Color can be selected from black, navy, gray, blown and red. - Font size for title of controls are adjustable. - Factory Preset 128 - Effects Preset 40 System Requirements - iOS 17.0 or later - Devices with Apple Silicon are recommended. A13 Fusion or above is highly 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: TerribleSync at Free against VAPolyFMWest's $14.99. TerribleSync also leads on iOS requirement (12.0 vs 16.6). VAPolyFMWest's advantage is rating (5.0 vs 4.0) and update cadence (every 4 days vs every 35 months). On ratings volume, ads, in-app purchases 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
TerribleSync is free to download; VAPolyFMWest costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
VAPolyFMWest holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 3 respectively.
TerribleSync ships an update every 35 months, VAPolyFMWest every 4 days. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.
| Parameter | TerribleSync | VAPolyFMWest |
|---|---|---|
| Price | Free — better | $14.99 |
| Rating | 4.0 (4 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 4 — better | 3 |
| Update frequency | Every 35 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 12.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 1 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Benjamin Roth | Ryo Togawa |
Customer experience
TerribleSync
VAPolyFMWest
In-app purchases
TerribleSync
No in-app purchases
VAPolyFMWest
No in-app purchases









