FAC Bandit vs sumFX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FAC Bandit
This app is a multiband audio effect processor that splits your audio into three frequency bands. Each band can be processed independently with its own effect, allowing for detailed sound sculpting and unique sonic transformations. It offers built-in effects and expandable options for creative audio manipulation.
- 3-Band multi effects processor
- Independent effects per band
- Built-in Saturator, Lofi, Ring Modulator
- Expandable effects via In-App Purchase
- Frequency isolator equalizer
- Adjustable crossover points with slope control
- Separate Dry/Wet output controls
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• 3-Band multi effects processor • Each band provides its own effect with mix blending control • Comes with built-in effects: Saturator, Lofi and Ring Modulator • Extendable via In-App purchase in Bandit store: Delay and Reverb • Frequency isolator equaliser (DJ style filter) • Two adjustable crossover points for low and high bands with slope up to 48dB • Separate Dry/Wet output controls • Suitable for any situation, going from subtle to drastic change • Multi-outs support, route each band to separate channels in your DAW • Advanced Responsive Design, portrait and landscape views • AuV3 for iOS (iPad/iPhone) FAC Bandit is a multiband audio effect that splits the audio signal into three bands of frequencies according two adjustable crossover points. Each band is processed independently by its own effect processor and the outputs are then recombined to produce the final effect. Each frequency range is altered with different effects and settings that won't sound the same if applied to the full frequency range. As you have probably realized, FAC Bandit is a wonderful and powerful sound design tool for designers who want to sculpt new personal, exciting and outstanding sounds. Either in a subtle way, without compromising the original tone, or in a more drastic way. - AuV3 and Standalone App - To use multiple outputs, you need a host able to provide additional output busses to the AuV3 plug-in The documentation is available at fredantoncorvest.com/FAC_Bandit.html
sumFX
This app is a versatile audio effects processor for musicians. It offers a modular design with multiple high-quality FX modules and customizable slots, allowing for quick creation of unique sounds. Focus on your music with intuitive controls and visual feedback.
- Modular multi-FX processor
- 8 high-quality FX modules
- 8 FX slots with Wet/Dry control
- 2 LFOs per slot
- 50+ cross-platform presets
- Pre/post waveform view
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sumFX is a modular multi-FX processor for Mac/PC and iOS. Designed with simplicity in mind, to help keep you focused on the music and the sum of your efforts. Packed with 8 high quality FX modules and an available 8 slots, each loaded with Wet/Dry control, Global Wet/Dry, and 2 LFOs per slot, creating new unique sounds is quick and easy. 50+ cross-platform slot & chain presets are included to get you to any sound you need quickly and we’ve packed in an easy to use pre/post waveform view to help keep you focused on the result of your FX. Modules: -syncDynamics - Multimode dynamic FX with BPM sync attack/release (Noise Gate, Expander, Compressor, Limiter) -stereoFilter - Stereo filter with link or individual channel controls (LPF12, HPF12, BPF12, LPF24, HPF24, BPF24, Notch, & Formant options). -variMod - Multimode modulation FX with stereo offset (Chorus, Flanger, Vibrato, Phaser, Tremolo, & Auto Pan) -EQuator - Full high quality EQ module (3 Parametric Bands, High/Low Shelf, & HPF/LPF). -frostReverb - Multi-Mode (Original, Plate, Spring, Room) Stereo Reverb. -bucketDelay - Stereo Analog Style Delay with individual channel control. -variPitch - Stereo Pitch Shifter with 3X Modes (Doubler, Harmonizer, & Full Control) -powerPhase - Multimode Saturation, Utility Gain In/Out, Mono Maker, Channel msDelay, & Phase inverter.
Screenshots
Verdict
The clearest difference is review sentiment: FAC Bandit at 90% against sumFX's 55%. FAC Bandit also leads on rating (4.9 vs 4.4) and ratings volume (57 vs 12). sumFX's advantage is in-app purchases (none vs 5). On price, update cadence, ads 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
FAC Bandit costs $9.99 and sumFX $9.99 up front. FAC Bandit sells 5 one-off in-app purchases. sumFX asks for nothing beyond the download.
FAC Bandit holds the better App Store score, 4.9 against 4.4. Both are backed by a comparable volume of ratings — 57 and 12 respectively. Written reviews point the same way: 90% of FAC Bandit's written reviews are positive against 55% of sumFX's.
FAC Bandit ships an update every 4 months, sumFX every 6 months. The most recent releases landed on September 18, 2026 and September 7, 2026 respectively.
| Parameter | FAC Bandit | sumFX |
|---|---|---|
| Price | $9.99 | $9.99 |
| Rating | 4.9 (57 ratings) — better | 4.4 (12 ratings) |
| Positive reviews | 90.2% of reviews — better | 54.5% of reviews |
| Number of ratings | 57 — better | 12 |
| Update frequency | Every 4 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Frederic Corvest | OSC Audio |
Customer experience
FAC Bandit
sumFX
In-app purchases
FAC Bandit
- Multiband Delays$1.99
- Multiband Reverbs$1.99
- Small Tip$1.99
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- Medium Tip$4.99
- Large Tip$14.99
sumFX
No in-app purchases









