# FD vs Mantis

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.

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.

## The numbers

| Metric | FD | Mantis |
| --- | --- | --- |
| Price | **$9.99** | $14.99 |
| Rating | [4.6 (32 ratings)](https://appshunter.io/ios/app/fd-1-filter-delay/id1448696965/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/mantis-bbd-echo/id1673531514/reviews)** |
| Number of ratings | **32** | 8 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Paid | Paid |
| Size | 61 MB | 10 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [AudioThing Ltd.](https://appshunter.io/developer/1659941236) |

## What reviewers say

### FD

[App page](https://appshunter.io/ios/app/fd-1-filter-delay/id1448696965)

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.

**Highlights:** Semi-modular effect plugin, Modulated filter section, Delay stage, Step sequencer, Low Frequency Oscillator, Mod matrix, Tempo sync

**Features:** Vision Pro support

**In-app purchases:** none


### Mantis

[App page](https://appshunter.io/ios/app/mantis-bbd-echo/id1673531514)

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.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FD free?

FD costs $9.99, with no in-app purchases.

### Is Mantis free?

Mantis costs $14.99, with no in-app purchases.

### Which has better reviews, FD or Mantis?

Mantis is rated higher. FD averages 4.6 out of 5 from 32 ratings, while Mantis averages 5.0 from 8 ratings.

### Do FD or Mantis have ads?

Neither FD nor Mantis shows ads.

### Which is updated more often, FD or Mantis?

FD ships an update every 4 months, and Mantis every 9 months. Most recently, FD was updated on October 1, 2026 and Mantis on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*