FD vs Mantis
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
Mantis
This audio plugin emulates a vintage 70s analog delay/echo unit, offering a warm, authentic sound. It features four echo taps, swell selectors, and a unique modulation section for chorus-like effects.
- Emulates rare 70s BBD delay/echo
- Warm analog sound
- Four echo taps
- Four swell selectors
- Rotafaze modulation section
- Mimics tape echo wow/flutter
- Chorus-delay effect
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Mantis is a plugin that emulates a rare BBD (bucket-brigade device) delay/echo unit of the 70s, faithfully recreating its warm and analog sound. Available as AUv3 and Standalone. As the original unit, Mantis features an echo section with four taps and four swell selectors. It also features the rotafaze section, a modulation that can mimic the wow/flutter of a tape echo or turn the unit into a unique chorus-delay.
Screenshots
Verdict
The clearest difference is rating: Mantis at 5.0 against FD's 4.6. FD's advantage is price ($9.99 vs $14.99) and update cadence (every 4 months vs every 9 months). On ads, in-app purchases, monetization model 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
FD costs $9.99 and Mantis $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Mantis holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 32 and 8 respectively.
FD ships an update every 4 months, Mantis every 9 months. Both last shipped on October 1, 2026.
| Parameter | FD | Mantis |
|---|---|---|
| Price | $9.99 — better | $14.99 |
| Rating | 4.6 (32 ratings) | 5.0 (8 ratings) — better |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 32 — better | 8 |
| Update frequency | Every 4 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 61 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | AudioThing Ltd. |
Customer experience
FD
Mantis
In-app purchases
FD
No in-app purchases
Mantis
No in-app purchases








