FM 304 vs NebulizerAU
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FM 304
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.
- 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
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FM 304 — 3x FM Synth Groovebox FM 304 is a powerful trio of 4-operator FM synthesizers, each with its own sequencer and effects. Built for fast, hands-on sound design, every parameter is available with a one-knob-per-function layout — no menus, no digging. Create evolving patterns, punchy sequences, and complex FM textures in seconds. Everything is on screen, ready to tweak, making it easy to move from idea to finished loop without breaking flow. Features • 3 independent 4-operator FM synthesizers • Immediate one-knob-per-function control • 3x 16-step sequencers (one per synth) • Built-in effects: delay, reverb, chorus • 3x LFOs for modulation • 8 FM algorithms • Note frequency quantisation • 100 save slots Designed for speed No menu diving. No setup. Just pure FM synthesis with everything visible and playable.
NebulizerAU
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.
- AUv3 effect plugin
- Tape delay emulation
- Lo-fi sound character
- Stackable on multiple tracks
- Compatible with GarageBand, AUM
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Old school warbly malfunctioning tape delay Nebulizer comes echoing back from the IAA doldrums. But fear not. Even though it's now an AUv3 effect plugin, ready to stack up on multiple tracks in GarageBand, AUM or your favourite audio application, it's still the wayward lo-fi monstrosity you used to know. And if you didn't know it, isn't it about time you did? Nebulizer is totally free. No ads, no in-app purchases, no subscriptions, no surveillance, no nag screens. If you want premium features, this is not the app for you.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | FM 304 | NebulizerAU |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.8 (5 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | 4 |
| Update frequency | Every 43 months | Daily — better |
| Ads | — | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 17 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Paul Betowski | Matthew Caldwell |
Customer experience
FM 304
NebulizerAU
In-app purchases
FM 304
No in-app purchases
NebulizerAU
No in-app purchases
