frekvens vs Combustor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
frekvens
This app offers a unique frequency shifter and stereo delay effect. It utilizes single sideband modulation and an infinite impulse response filter for advanced audio manipulation. Additional features include high/low pass filters and an LFO for delay modulation.
- Frequency shifter
- Stereo delay
- High and low pass filter
- LFO for delay modulation
- Core MIDI CC input
- Audiobus and Inter-App Audio support
- Audio Unit extension
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Frekvens is a frequency shifter and delay effect. Unlike a pitch shifter all frequencies are shifted linearly and then fed back into itself using the stereo delay unit. The frequency shifting is achieved with single sideband modulation using a hilbert transform and an infinite impulse response filter for fast computations. Frekvens also comes with a high and low pass filter and a lfo for modulating the delay play head. - frequency shifter - high, low pass filter - stereo delay - core midi cc input - audiobus - inter app audio - audio unit extension - save, load
Combustor
This audio effect extension transforms tracks with a unique time-bending resonator. Create vibrant textures, subtle resonances, and dynamic sweeps. It's designed for electronic musicians and producers seeking to add wild or organic qualities to their sounds.
- Time bending resonator effect
- Creates distorted textures and physical resonance
- Envelope follower for dynamic control
- MIDI input for melodic control
- Performative interface
- AUv3 compatible
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*** Note: Combustor is an Audio Unit effect extension and requires an AUv3 compatible host app, like Logic Pro, Drambo or GarageBand. It does not run as a standalone app *** Combustor is a unique, wild resonating body fashioned to spice up or extremely transform your tracks. At the heart of Combustor is a custom time bending resonator that doesn't sound like anything you have heard before. You can create anything from vibrant, distorted texture, perfectly suited for "hardcore" electronic musicians, to subtle physical resonance, which is often lacking in synthesized sounds. Combustor contains an envelope follower, to create dynamic-controlled pitch or filter sweeps. It also has MIDI input, that controls resonator's pitch, to make something melodic and organic out of non-melodic sounds, like drums. With just a few knob turns, a boring sound can be turned into screaming madness that sounds like it went out of control. A simple and straightforward interface makes Combustor a performative tool that allows you to directly interact with your sound.
Screenshots
Verdict
The clearest difference is price: frekvens at $2.99 against Combustor's $4.99. frekvens also leads on iOS requirement (11.0 vs 14.0). On rating, review sentiment, ratings volume and update cadence 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
frekvens costs $2.99 and Combustor $4.99 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 — 4.8 for frekvens against 4.7 for Combustor. Both are backed by a comparable volume of ratings — 21 and 19 respectively. Written reviews are what separate them: 83% of frekvens's written reviews are positive against 80% of Combustor's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 25, 2026 and September 20, 2026 respectively.
| Parameter | frekvens | Combustor |
|---|---|---|
| Price | $2.99 — better | $4.99 |
| Rating | 4.8 (21 ratings) — better | 4.7 (19 ratings) |
| Positive reviews | 83.3% of reviews — better | 80.0% of reviews |
| Number of ratings | 21 — better | 19 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 3 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Erik Sigth | BeepStreet |
Customer experience
frekvens
Combustor
In-app purchases
frekvens
No in-app purchases
Combustor
No in-app purchases









