FD vs MF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FD
This app is a semi-modular audio effect plugin featuring dedicated filter, delay, and modulation sections. It allows for the creation of rhythmic filter sequences and a wide range of complex audio effects through its flexible modulation matrix.
- Semi-modular effect plugin
- Modulated filter section
- Delay stage
- Step sequencer
- Low Frequency Oscillator
- Mod matrix
- Tempo sync
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FD-1 is a Semi-Modular Effect Plugin including dedicated Filter, Delay and Modulation sections. At it's core, FD-1 is designed to create filter rythms and grooves by first sending the signal through a modulated filter section before feeding it to a delay stage but it goes much further than that. Built-in Step Sequencer and Low Frequency Oscillator serve as modulation sources and are ideal for creating rythmic filter sequences either free running or tempo-synced to a host application. However, due it's semi modular nature, not just filter cutoff but every control within FD-1 can be a modulation target allowing for an increased range effects and combinations ranging from Chorus and Flanger type effects over Analog and Tape Style echos to complex Stutter and Repeat effects. Overview: - VA Multi Mode Filter with 2 & 4 Pole options - Digital Stereo Delay with Tempo Sync and Time Range Control - Analog Style Step Sequencer - Low Frequency Oscillator - Easy to use Mod Matrix - Input Low-Cut and Drive Controls - Individual Return Levels for Filter and Delay Connectivity: - Standalone - AUv3 - IAA - AudioBus (Filter) MIDI: - Tempo Sync - CC Control Requirements: - iOS9+ - iPad 4th generation or newer
MF
This app is a digital recreation of a classic analog lowpass filter effect pedal. It allows users to add dynamic motion and warm, vibrant tones to various audio sources like guitars, vocals, and synthesizers.
- Analog 4-pole lowpass filter emulation
- Envelope follower for dynamic motion
- Processes guitar, voice, and synths
- AUv3 effects plugin
- Warm and vibrant sound quality
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The MF-101S Lowpass Filter is a re-invention of Moog Music’s classic Moogerfooger MF-101 analog effects pedal. The hardware MF-101 Lowpass Filter, introduced in 1998, contained two complete modular functions: a classic, all-analog 4-pole Lowpass Filter paired with an envelope follower to impart dynamic motion to the filtered sound. Designed by Bob Moog and his engineering team, the MF-101 was a direct descendant of the original Moog modular synthesizers, adapted to process, modulate, and play with inputs ranging from guitar, voice, and synthesizer to any imaginable audio source. The MF-101 Lowpass Filter has been meticulously recreated as the MF-101S, capturing not only the warm and vibrant sound of the original, but also the organic way in which the parameters interact to create a musical playing experience. The MF-101S is an AUv3 effects plug-in that requires a compatible host or DAW to function.
Screenshots
Verdict
The clearest difference is price: FD at $9.99 against MF's $14.99. FD also leads on review sentiment (67% vs 50%) and ratings volume (32 vs 8). MF's advantage is update cadence (monthly vs every 4 months). On rating, ads, in-app purchases and monetization model 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
FD costs $9.99 and MF $14.99 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 — 4.6 for FD against 4.5 for MF. Both are backed by a comparable volume of ratings — 32 and 8 respectively. Written reviews are what separate them: 67% of FD's written reviews are positive against 50% of MF's.
FD ships an update every 4 months, MF monthly. The most recent releases landed on September 12, 2026 and August 12, 2026 respectively.
| Parameter | FD | MF |
|---|---|---|
| Price | $9.99 — better | $14.99 |
| Rating | 4.6 (32 ratings) — better | 4.5 (8 ratings) |
| Positive reviews | 66.7% of reviews — better | 50.0% of reviews |
| Number of ratings | 32 — better | 8 |
| Update frequency | Every 4 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 61 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | Moog Music Inc. |
Customer experience
FD
MF
In-app purchases
FD
No in-app purchases
MF
No in-app purchases









