FAC Polyflo vs ANALOGySTR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FAC Polyflo
This AUv3 plugin allows you to modulate and sequence MIDI instruments and modular hardware. It outputs both MIDI and analog CV simultaneously, supporting hybrid digital and analog setups. Convert various signals into control voltages for deep and flexible modulation.
- AUv3 plugin for modulation and sequencing
- Outputs MIDI and analog CV simultaneously
- Converts signals to control voltages
- Two LFO generators with syncing
- Integrated envelope follower
- Six FLO(W) processors for signal shaping
- Universal Purchase for iOS, macOS, Vision Pro
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• AUv3 plugin to modulate and sequence MIDI instruments and modular hardware • Outputs MIDI and analog CV simultaneously for integrated hybrid setups • Fully functional in software-only environments with full MIDI support • Converts LFOs, MIDI notes, pitch, and control changes into control voltages • Includes two LFO generators with random spline, cross-modulation and syncing • Integrated envelope follower to track audio input or sidechain signal • Six FLO(W) processors for combining and shaping signals with math and logic • Each FLO supports 18 inputs with individual polarity, divider and multiplier • Multi-out support, built-in waveform viewer, Audio FX, and MIDI FX • Advanced Responsive Design, portrait and landscape views • Universal Purchase: AUv3 for iOS (iPad/iPhone), macOS and Vision Pro FAC Polyflo is an AUv3 plugin for modulating and sequencing MIDI instruments and modular gear via control voltage. It outputs MIDI and analog CV simultaneously, making it well-suited for hybrid setups that combine digital and analog equipment. The plugin includes two LFO generators offering 10 waveforms, including classic shapes and random spline, with support for cross-modulation and syncing. It also features an envelope follower that tracks audio FX input or an external sidechain. The generated signals, together with the host clock and MIDI input, are fed into six independent FLO(W) processors. These processors combine, shape, and route inputs using math operations, conditional logic, and comparators. Each FLO includes individual polarity, division, and multiplication controls, providing deep and flexible modulation that balances chaotic creativity with precise timing. Each FLO processor output is connected to its own output bus, enabling easy integration with hardware via DC-coupled audio interfaces like the Expert Sleepers ES-9. For simpler setups, FLO outputs can be routed to the stereo output. FAC Polyflo can also convert MIDI notes, pitch, and control changes into control voltages, making it a powerful MIDI-to-CV solution. If you prefer to work exclusively with software, the plugin runs smoothly in software-only environments with full MIDI support, making it equally suited for purely digital workflows. FAC Polyflo works as both an Audio Unit FX and MIDI FX, featuring a clean, touch-optimized interface with precise control and waveform visualization. It’s available as an AUv3 for iOS (iPad/iPhone), macOS, and Vision Pro, and requires a compatible AUv3 host app to run. This is an AUv3 Effect and requires a compatible host to work The documentation is available at fredantoncorvest.com/FAC_Polyflo.html
ANALOGySTR
This virtual instrument plugin recreates the iconic sounds of 1970s analog string synthesizers. It offers three distinct string tones, adjustable filters, and classic ensemble, phaser, and reverb effects for a wide sonic palette. It's designed for music producers and enthusiasts seeking vintage synth textures.
- Emulates 1970s analog string synths
- Three blendable base string tones
- High and low pass filters
- Ensemble and phaser effects
- Plate reverb effect
- MIDI and velocity sensitivity
- AUv3 compatible
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ANALOGySTR Retro String Machine (AUv3) ANALOGySTR is a virtual instrument plugin that can run standalone, or in any AU compatible host such as Logic Pro or GarageBand. Please note that the standalone version does not include a built-in keyboard - you need to connect a suitable MIDI device to play the synth. Overview ANALOGySTR is a tribute to the analog string synthesizers made in the 1970's which are still popular today for good reason. From Pink Floyd to Jean-Michel Jarre, from The Cure to Air, chances are you've heard these "string machines" on countless recordings. Funnily enough, because of the limited technology at the time, they don't actually sound a lot like real strings, but have a distinct tonal character of their own which has become iconic and much loved. Based on sub-octave divider oscillators originally developed for transistor organs, the basic sounds are somewhat thin and reedy but the addition of phaser and "ensemble" effects gives the instruments their distinctive sound and huge appeal. ANALOGySTR has three different base "string" tones that can be blended, and further shaped with high and low pass filters to emulate the limited frequency response of the vintage instruments. Of course, no string machine emulation would be complete without the "ensemble" and phaser effects and ANALOGySTR includes both in its dedicated effects section, with the option to process the signal in classic mono, or super-wide stereo mode. A variable size "plate" type reverb with mono / stereo options completes the effects section. Please note that ANALOGySTR is not intended to be a replica or digital emulation of a specific instrument, but its design and development was heavily influenced by those classic old machines. And while I like to think ANALOGySTR does get pretty close to those vintage string machine tones, it can also stray into other sonic territory, and the presets include examples of organ, choir and synth pad type sounds. MIDI Implementation ANALOGySTR is a 16 voice polyphonic "somewhat" (*) velocity-sensitive MIDI instrument and is playable over a keyboard range from A0 (21) to C7 (96) on any MIDI channel. ANALOGySTR also responds to mod wheel / vibrato (CC#1), expression / volume (CC#11), sustain (CC#64), all notes off (CC#123) and pitch-bend (+/- 2 semitones). (*) Notes will be slightly louder as you play harder, but the dynamic range is reduced slightly. ANALOGySTR does not currently respond to breath controller or after-touch messages. About The UI Not everyone likes the UIs of my latest (2025) plugins - I get it. However, the simplistic and generic approach allows me to (a) 99% focus on the DSP, sound quality and CPU performance, and (b) significantly reduce the development (and potential maintenance) time, which is reflected in my pricing. For more info and support please visit: www.waverley-instruments.com/robjackson
Screenshots
Verdict
The clearest difference is in-app purchases: ANALOGySTR at none against FAC Polyflo's 3. ANALOGySTR also leads on price ($2.99 vs $9.99) and iOS requirement (12.0 vs 16.4). On rating, review sentiment, ratings volume and ads 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
FAC Polyflo costs $9.99 and ANALOGySTR $2.99 up front. FAC Polyflo sells 3 one-off in-app purchases. ANALOGySTR asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.9 for FAC Polyflo against 5.0 for ANALOGySTR. Both are backed by a comparable volume of ratings — 11 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
| Parameter | FAC Polyflo | ANALOGySTR |
|---|---|---|
| Price | $9.99 | $2.99 — better |
| Rating | 4.9 (11 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 11 — better | 4 |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 16.4 | 12.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Frederic Corvest | Rob Jackson |
Customer experience
FAC Polyflo
ANALOGySTR
In-app purchases
FAC Polyflo
- Small Tip$1.99
- Medium Tip$4.99
- Large Tip$14.99
ANALOGySTR
No in-app purchases








