# FM 304 vs NebulizerAU

The clearest difference is price: NebulizerAU at Free against FM 304's $3.99. NebulizerAU also leads on update cadence (daily vs every 43 months) and rating (5.0 vs 4.8). FM 304's advantage is iOS requirement (12.0 vs 15.0). On ratings volume and in-app purchases there is nothing between them.

NebulizerAU is free to download; FM 304 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

NebulizerAU holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 5 and 4 respectively.

FM 304 ships an update every 43 months, NebulizerAU daily. Both last shipped on October 24, 2026.

## The numbers

| Metric | FM 304 | NebulizerAU |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [4.8 (5 ratings)](https://appshunter.io/ios/app/fm-304/id1449167984/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/nebulizerau/id6760477018/reviews)** |
| Number of ratings | **5** | 4 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 43 months | **Daily** |
| Monetization | Paid | **Free** |
| Size | 17 MB | 2 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Paul Betowski](https://appshunter.io/developer/538476580) | [Matthew Caldwell](https://appshunter.io/developer/993500585) |

## What reviewers say

### FM 304

[App page](https://appshunter.io/ios/app/fm-304/id1449167984)

Create music with three powerful FM synthesizers, each featuring integrated sequencers and onboard effects. This app offers intuitive real-time control over all synth parameters for quick sound design and tune creation.

**Highlights:** Three 4-operator FM synths, Integrated sequencers, Onboard delay, reverb, and chorus effects, One knob per function control, 100 save slots, 8 algorithms, Note frequency quantize

**In-app purchases:** none


### NebulizerAU

[App page](https://appshunter.io/ios/app/nebulizerau/id6760477018)

This audio effect plugin emulates the sound of an old-school, warbly tape delay. It functions as an AUv3 effect, allowing it to be used on multiple tracks within various audio applications. It delivers a distinct lo-fi sound.

**Highlights:** AUv3 effect plugin, Tape delay emulation, Lo-fi sound character, Stackable on multiple tracks, Compatible with GarageBand, AUM

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FM 304 free?

FM 304 costs $3.99, with no in-app purchases.

### Is NebulizerAU free?

NebulizerAU is free to download, with no in-app purchases.

### Which has better reviews, FM 304 or NebulizerAU?

NebulizerAU is rated higher. FM 304 averages 4.8 out of 5 from 5 ratings, while NebulizerAU averages 5.0 from 4 ratings.

### Which is updated more often, FM 304 or NebulizerAU?

FM 304 ships an update every 43 months, and NebulizerAU daily. Most recently, FM 304 was updated on October 24, 2026 and NebulizerAU on October 24, 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.*