Comparison

Otoo vs NebulizerAU

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Otoo

This music creation app offers a unique free-form sequencer for building beats and melodies. It supports built-in sounds, sampling, and AUv3 instruments, with live performance effects and song arrangement tools.

Highlights
  • Free-form step sequencer
  • Single-screen workflow
  • Built-in sounds and sampler
  • AUv3 instrument support
  • Performance Mode effects
  • Export WAV, MP3, and MIDI
Features
Currently charting
Read full description

Otoo is a streamlined, one-screen groovebox designed for frictionless music production. Built around an innovative free-form step sequencer, Otoo breaks away from rigid grids, allowing you to place, drag, and stack notes freely across independent rows. Whether you are sketching out ideas using the native built-in engine and sampler or hosting your favorite third-party AUv3 plugins, Otoo delivers a distraction-free environment that prioritizes speed and musical flow. On iPhone, the interface dynamically scales to give your AUv3 instruments a near-fullscreen home, paired with a compact, highly responsive keyboard for immediate creation on the go. Otoo also includes Otoo MIDI, an AUv3 MIDI processor version of the app. It brings Otoo’s pattern-based sequencing into compatible AUv3 hosts, where playback follows the host timeline and instruments are routed as MIDI Out destinations instead of audio instruments. Distraction-Free Workflow • The single-screen layout keeps your sequence, arrangement and mixer visible at all times so you never have to dive into menus. • A free-form step sequencer lets you place, drag, and stack notes across any row without rigid instrument or track restrictions. • Step editing mode gives you precise control over note length, velocity, and timing subdivisions. • The gesture-driven mixer allows for quick volume adjustments, muting, and soloing directly from the main grid. • 4 rows on iPhone and 5 on iPad, with multiple instruments available in each row at different steps 
• 2-octave keyboard for playing and learning real notes Sounds and plug-ins 
• Up to 8 instruments per project
 • Built-in sounds and sampler
 • Use any installed AUv3 instruments in a large, near-fullscreen view with a compact keyboard 
• Up to 2 AUv3 effects per instrument
 • Sampler with instant key-by-key recording and chromatic mapping Patterns to full songs
 • Build songs from simple patterns
 • Draggable loop markers for quick arrangement changes Performance mode
 • Live sequencer and audio effects such as reverse, beat repeat, randomize, swing, triplet, tape, and more
 • Play the pattern like a keyboard by tapping steps directly Other features • Main output with built-in level protection • Automatic metronome when recording live into empty patterns • Export patterns or full songs as WAV or MP3 for easy sharing • Export performances as perfect loops • MIDI export • Supported time signatures: 4/4, 3/4, 4/4T and sequencer swing.

About

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.

Highlights
  • AUv3 effect plugin
  • Tape delay emulation
  • Lo-fi sound character
  • Stackable on multiple tracks
  • Compatible with GarageBand, AUM
Features
Read full description

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

Otoo4 screens
NebulizerAU2 screens

Verdict

The call

The clearest difference is price: NebulizerAU at Free against Otoo's $6.99. NebulizerAU also leads on update cadence (daily vs every 6 days). Otoo's advantage is ratings volume (28 vs 3) and chart position (#195 vs unranked). On rating, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

NebulizerAU is free to download; Otoo costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Otoo against 5.0 for NebulizerAU. That said, the two scores are not equally well evidenced: Otoo has 28 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Otoo ships an update every 6 days, NebulizerAU daily. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.

Scorecard5 real differences · 6 level
Otoo versus NebulizerAU: the parameters behind the verdict, then further details
ParameterOtooNebulizerAU
Price$6.99Free — better
Rating5.0 (28 ratings)5.0 (3 ratings)
Positive reviews100.0% of reviews—
Number of ratings28 — better3
Update frequencyEvery 6 daysDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#195 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size64 MB2 MB
Age rating4+4+
DeveloperBeepStreetMatthew Caldwell

Customer experience

Otoo

All ratings28 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews20 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

NebulizerAU

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Otoo

No in-app purchases

None

NebulizerAU

No in-app purchases

Questions

Is Otoo free?
Otoo costs $6.99, with no in-app purchases.
Is NebulizerAU free?
NebulizerAU is free to download, with no in-app purchases.
Which has better reviews, Otoo or NebulizerAU?
Otoo and NebulizerAU are both rated 5.0 out of 5 on the App Store, from 28 and 3 ratings respectively.
Do Otoo or NebulizerAU have ads?
Neither Otoo nor NebulizerAU shows ads.
Which is updated more often, Otoo or NebulizerAU?
Otoo ships an update every 6 days, and NebulizerAU daily. Most recently, Otoo was updated on September 21, 2026 and NebulizerAU on September 13, 2026.

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