FAC Envolver vs PolyBud Polyrhythmic Sequencer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FAC Envolver
This audio effect processor transforms input audio using MIDI CC and notes to control synthesizer parameters. It features a noise gate and a trance gate for unique sound modulation and sequences.
- MIDI CC and note control
- Envelope follower
- Noise gate
- Trance gate
- Stereo effect with linked channels
- Adjustable pitch and scale progression
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Being a MIDI effect in its essence, controlling your synthesizers parameters (e.g volume, cutoff, res) with MIDI CC and notes, FAC Envolver is also able to transform the input audio via two exclusive effects: a Noise Gate and a Trance Gate. This combination is the key to breathe life into your sound, providing interesting natural modulation and sequences that will always be different by nature. Under the hood, FAC Envolver is an envelope follower delivering MIDI data generated from the contour of a signal. The source of this signal may come from two distinctive circuits: the first one is a classic envelope follower and the second one is a rythmical pattern called trigger gate. Both circuits are responsible for providing a signal envelope that can be altered by a set of parameters and delivered as MIDI control change messages (CC). The generated signal envelope also passes through a gate detection mechanism driven by a threshold. When the signal goes above the threshold, the gate is open and when the signal goes below, the gate is closed. This open/close sequence provides a second envelope which is delivered as MIDI CC (on/off) and notes. The pitch of the note may be set within the effect or from an external value provided by MIDI input. Both may follow a particular scale progression. The envelope follower circuit also provides a noise gate to control precisely the level of your audio signal. This uses the same open/close sequence built by the gate detection mechanism that delivers MIDI data but acts on the audio. Following the same logic, when the second circuit - the trigger gate - is engaged, the open/close sequence provides a trance gate style effect to the audio. FAC Envolver is a stereo effect and provides two slots, one slot per channel. Both can be linked to facilitate the manipulation. The audio can also be turned to mono and the dry and wet audio can be mixed.
PolyBud Polyrhythmic Sequencer
Create complex musical sequences with multiple polyrhythmic tracks. Control note, velocity, gate, and MIDI CC parameters with independent step lengths and rates. Route MIDI output to your favorite synths and AUv3 hosts.
- Multitrack polyrhythmic MIDI sequencing
- Note and MIDI CC tracks
- Configurable step lengths per mode
- Independent track rates
- Assignable MIDI channels
- Ramp value for CC smoothing
- AUv3 plugin support
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PolyBud is a multitrack polyrhythmic AUv3 MIDI sequencer. You can add multiple note or MIDI CC tracks to the each pattern. The note tracks has the note, velocity, gate, ratchet, probability and randomisation modes. You can set different step lengths to the each mode which would introduce polyrhythmic variations immediately. Another great feature is the each track can run in a different rate which is great for creating unique polyrhythmic sequences. Also, you can assign different MIDI channels to the each track so that you can control multiple synths within a single PolyBud pattern. The MIDI CC tracks is great for modulating the synth parameters. You can introduce polyrhythmic modulations by setting the different step lengths and different rates to your MIDI CC tracks. Also, you can set a ramp value for smoothing up the CC value changes per step. If you set the ramp value to 0% then you can have the classic sample and hold modulation. PolyBud is a MIDI app and it don't produce any sound of its own. You need to route PolyBud's MIDI out to your audio apps in order to run PolyBud. For the AUv3 plugin, you need an AUv3 host app such as AUM, Cubase, NanoStudio, ZenBeats, BeatMaker, apeMatrix etc.
Screenshots
Verdict
The clearest difference is update cadence: PolyBud Polyrhythmic Sequencer at every 2 weeks against FAC Envolver's every 3 months. PolyBud Polyrhythmic Sequencer also leads on price ($5.99 vs $9.99). FAC Envolver's advantage is ratings volume (42 vs 9) and iOS requirement (10.0 vs 13.0). On rating, review sentiment, ads and in-app purchases 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 Envolver costs $9.99 and PolyBud Polyrhythmic Sequencer $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.9 for FAC Envolver against 4.9 for PolyBud Polyrhythmic Sequencer. Both are backed by a comparable volume of ratings — 42 and 9 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
FAC Envolver ships an update every 3 months, PolyBud Polyrhythmic Sequencer every 2 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | FAC Envolver | PolyBud Polyrhythmic Sequencer |
|---|---|---|
| Price | $9.99 | $5.99 — better |
| Rating | 4.9 (42 ratings) — better | 4.9 (9 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 42 — better | 9 |
| Update frequency | Every 3 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 25 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Frederic Corvest | Cem Olcay |
Customer experience
FAC Envolver
PolyBud Polyrhythmic Sequencer
In-app purchases
FAC Envolver
No in-app purchases
PolyBud Polyrhythmic Sequencer
No in-app purchases
Questions
Is FAC Envolver free?
Is PolyBud Polyrhythmic Sequencer free?
Which has better reviews, FAC Envolver or PolyBud Polyrhythmic Sequencer?
Do FAC Envolver or PolyBud Polyrhythmic Sequencer have ads?
Which is updated more often, FAC Envolver or PolyBud Polyrhythmic Sequencer?
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