# FD vs VAPolyFM

FD and VAPolyFM both sit at 4.6 stars, but that hides the real split: 67% of FD's written reviews are positive against 17% of VAPolyFM's. FD also leads on price ($9.99 vs $14.99) and update cadence (every 4 months vs every 17 months). On rating, ads, in-app purchases and monetization model there is nothing between them.

FD costs $9.99 and VAPolyFM $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 VAPolyFM. That said, the two scores are not equally well evidenced: FD has 32 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 67% of FD's written reviews are positive against 17% of VAPolyFM's.

FD ships an update every 4 months, VAPolyFM every 17 months. The most recent releases landed on October 1, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | FD | VAPolyFM |
| --- | --- | --- |
| Price | **$9.99** | $14.99 |
| Rating | **[4.6 (32 ratings)](https://appshunter.io/ios/app/fd-1-filter-delay/id1448696965/reviews)** | [4.5 (6 ratings)](https://appshunter.io/ios/app/vapolyfm/id6737108540/reviews) |
| Number of ratings | **32** | 6 |
| Positive reviews | **66.7% of reviews** | 16.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 17 months |
| Monetization | Paid | Paid |
| Size | 61 MB | 17 MB |
| Requires iOS | **9.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [Ryo Togawa](https://appshunter.io/developer/1474193056) |

## 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


### VAPolyFM

[App page](https://appshunter.io/ios/app/vapolyfm/id6737108540)

Create music with a versatile hybrid synthesizer offering both FM and virtual analog subtractive synthesis. Explore a wide range of effects, a built-in sequencer, and extensive MIDI support. Save and share projects seamlessly across iPhone, iPad, and Mac.

**Highlights:** FM synthesizer with 6 operators, Virtual analog subtractive synthesizer, Built-in effects (delay, chorus, reverb), Sequencer with piano roll editor, AudioUnit Extension (AUv3) support, Ableton Link and MIDI 2.0 support, iCloud Drive project sharing

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FD free?

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

### Is VAPolyFM free?

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

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

FD is rated higher. FD averages 4.6 out of 5 from 32 ratings, while VAPolyFM averages 4.5 from 6 ratings.

### Do FD or VAPolyFM have ads?

Neither FD nor VAPolyFM shows ads.

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

FD ships an update every 4 months, and VAPolyFM every 17 months. Most recently, FD was updated on October 1, 2026 and VAPolyFM on October 8, 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.*