FAC Drumkit vs Otoo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FAC Drumkit
This app combines synthesis and sample playback to create unique drum sounds. It offers extensive control over each voice with advanced envelopes, filters, and modulation options. Easily design custom drum kits or use built-in presets and randomization for inspiration.
- 16 Voices Drum Synthesizer
- Stereo Sample Player
- 2 Oscillators per voice
- Advanced Pitch and Amp Envelopes
- Randomization Engine
- Mute/Choke Groups
- AUv3 Support
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• 16 Voices Drum Synthesizer and Stereo Sample Player • 2 oscillators (16 Waveforms) per voice with filters, Phase and Ring modulation • 1 sample player per voice with sample position, filters, phase and stereo control • Expressive instrument: velocity amount per Amp and Pitch modulation (MIDI CC) • Randomization engine (Drum Synthesizer, Sample Player, Envelopes) • Advanced Pitch and Amp envelopes with multi control points and delay • Envelope templates, modifiers and copy/paste • Mute/Choke groups: reduce overlapping and keep your drums tight • Drag and Drop File Support and multi sample loading • Mixer: 16 voices (Multi Output - If Supported By HOST) • Pad controller: voices triggered by Pad (MIDI OUT and Velocity Sensitive) • Includes classic drum machines built in presets for inspiration • Library explorer: drums organized by category • iOS AuV3 (iPad/iPhone) - Advanced Responsive Design, portrait and landscape views Everyone agrees that the drums are a very important key element of almost every genre out there, they are the foundation of a song. We are all fans of acoustic drums and drum machines, they each have different characters and strengths. FAC Drumkit combines both worlds, samples and synthesis, in order to provide new exciting and unique sounds. As a rule of thumb, the synthesizer section brings the body of the sound, and the sampler the unique character. Both parts are layered together and contain essential parameters to ensure they won't clash and will sit well together. On top of the samples and synthesizer section, FAC Drumkit brings unique Amp and Pitch envelopes with precise control points to modify the curve in a gentle or extreme way. The envelopes play a very important part in the signal path because, thanks to their flexibility, they allow designing very special transition. Indeed, the envelope of a Clap is probably the best one to illustrate the benefit of such envelopes created with points. The burst kind of sound is very hard to replicate with classic ADSR, it's not the case in FAC Drumkit. Needless to say, thanks to the control points the pitch transitions are also more interesting and precise. The value of each control point can also be altered manually, to set the root note of a kick for example. FAC Drumkit is for everyone, as sound designer you will be able to synthesize your own drums in a fun and creative way. On the other hand, if you are looking for instant results, use the provided presets or load your favourite sample pack in the sample section of the 16 voices. The randomization engine makes the creation of new sounds really easy. Define what you want to randomize and you are ready to go. Remember that instrument category plays a role in the randomization process. For example, if you want to design a drum kick set the instrument label to BD (or use the voice index to get a wider sound palette). It's also very interesting to select a sound you like and start the randomization process from there, in a gentle way or not, thanks to the options available in the voice button (page selector). FAC Drumkit is an expressive instrument, the amount of velocity can be set individually for each amplitude envelope, and the pitch envelopes can be modulated by external MIDI control change messages. The pitch modulation applies on control points or on the whole pitch envelopes. Important: The standalone app is a factory version only and you won't be able to save user presets. Use the AuV3. The documentation is available at fredantoncorvest.com/FAC_Drumkit.html
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.
- Free-form step sequencer
- Single-screen workflow
- Built-in sounds and sampler
- AUv3 instrument support
- Performance Mode effects
- Export WAV, MP3, and MIDI
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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.
Screenshots
Verdict
The clearest difference is price: Otoo at $6.99 against FAC Drumkit's $17.99. Otoo also leads on in-app purchases (none vs 3) and update cadence (every 6 days vs every 2 months). FAC Drumkit's advantage is iOS requirement (13.0 vs 15.6). On ratings volume, ads 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
FAC Drumkit costs $17.99 and Otoo $6.99 up front. FAC Drumkit sells 3 one-off in-app purchases. Otoo asks for nothing beyond the download.
Otoo holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 83 and 28 respectively. Written reviews point the same way: 88% of FAC Drumkit's written reviews are positive against 100% of Otoo's.
FAC Drumkit ships an update every 2 months, Otoo every 6 days. The most recent releases landed on October 19, 2026 and October 14, 2026 respectively.
| Parameter | FAC Drumkit | Otoo |
|---|---|---|
| Price | $17.99 | $6.99 — better |
| Rating | 4.7 (83 ratings) | 5.0 (28 ratings) — better |
| Positive reviews | 88.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 83 — better | 28 |
| Update frequency | Every 2 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 80 MB | 64 MB |
| Age rating | 4+ | 4+ |
| Developer | Frederic Corvest | BeepStreet |
Customer experience
FAC Drumkit
Otoo
Bugs and requests
FAC Drumkit
Reported bugs
7 issues- Plugins not loading when reloading sessions
- FAC Drumkit plugin broken/unstable in Cubasis, Logic Pro, AUM
- Multi-out feature broken or misunderstood
- User/imported samples very low in volume
- Samples make no sound for some users
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- Will not work in BM3 or other DAWs, no sound when recording
- DAW does not recognize playing and will not record drum track
Requested features
11 requests- Companion sequencer app
- MIDI channel per sound for pitch control
- LFOS for modulation
- Loop option for envelopes
- More sample time
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- Envelope banks for saving shapes
- LFO access to envelope bank and presets
- 3 LFOs per kit
- Undo/redo functionality
- Dark mode option
- More varied and experimental free drum banks
Otoo
Not enough reviews yet to summarise bugs or requests.
In-app purchases
FAC Drumkit
- Small Tip$1.99
- Medium Tip$4.99
- Large Tip$14.99
Otoo
No in-app purchases









