Audio Object vs Drum Rack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Audio Object
This pocket-sized instrument turns your iPhone into a portable music creation studio. It features a four-track looper, a three-voice drum machine, and an eight-pad sampler with extensive editing capabilities. Seamlessly integrate with your Mac DAW via USB for professional workflows.
- Four-track looper with bar-quantized recording
- Three-voice drum machine click track
- Eight-pad sampler with EQ and varispeed
- Project save, load, and WAV stem export
- Stereo audio streaming to Mac DAWs via USB
- MIDI clock output over USB
- Records stereo from Core Audio interfaces
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Audio Object is a pocket-sized music instrument for iPhone. It looks and works like a small piece of hardware — a wooden body with an instrument panel on each face. Pull the wood edge and the body rotates to the next face. WHAT IT DOES - Four-track looper with bar-quantized recording and per-loop trim - Three-voice drum machine as the click track — kick, snare, hi-hat with a per-step accent grid - Eight-pad sampler with grid, auto, and tap chopping, two switchable banks, three-band EQ, varispeed tuning - Project save, load, and WAV stem export with tempo map - Streams audio to any Mac DAW over USB (Inter-Device Audio & MIDI) - Sends MIDI clock over USB — Ableton, Logic, and Bitwig lock transport to the phone - Records stereo from any Core Audio interface (iRig, Focusrite, MOTU, and others) HOW IT WORKS Six faces. Perform pads on one, sampler on another, click and time signature on a third, projects on the back, I/O on top, master on the bottom. No menus, no tabs. Every control lives on the body. The click track is not a metronome. It is a three-voice drum machine with per-step accents, subdivisions from quarter notes to swing, and time signatures from 3/4 to 12/8. Set up a kick-snare-hat pattern, press record, loop on the beat. The sampler holds eight pads across two banks. Record from the mic or load from Files. Chop by grid, by transient, or by tapping markers. Each pad carries a three-band EQ, varispeed pitch, and an amplitude envelope. All eight play polyphonically. Recording quantizes to the bar, the beat, or runs free. A dedicated loop-adjust face trims each loop to the sample — drag the region brackets, snap to the grid, hear the result while the brackets move. Plug the phone into a Mac over USB. Audio Object appears as an audio input and MIDI clock source. The DAW locks transport to the phone's tempo. No drivers, no setup. Plug a USB audio interface into the phone. Audio Object names the device on screen and records through its preamps at up to 48 kHz stereo. WHAT IS NEXT A synthesizer — bass, chord, and lead modes — is in development for the next major release.
Drum Rack
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Drum Rack builds every drum sound from scratch. No samples anywhere — the kick, snare, hat and clap are synthesised as you play them, which is why a kick can drop from 200 Hz to 49 Hz along a curve you draw with your finger. WHAT IT DOES Four synthesised voices, each with its own controls. Draw the pitch envelope of the kick and the snare by hand: drag a point, add a point, bend the curve between two points. Watch the rendered waveform change as you go. A 32-step sequencer with per-step velocity, timing nudge and ratchets, so a single step can hold a roll of up to eight hits. Time signatures from 3/4 to 7/4, grids from 1/8 to 1/32 including triplets. Eighteen genre presets, from house and techno to jungle, boom bap and reggaeton. Each one loads a full kit and a pattern to start from. Export a loop as a WAV file, or the pattern as MIDI. The MIDI carries velocity, nudge, ratchets and time signature, and lands on the General MIDI drum map — drop it on a drum rack in your own DAW and it plays on your own kit. WHAT IT DOES NOT DO No account. No sign-in. No advertising. No analytics. No tracking. Your patterns stay on your device. Nothing is uploaded. FROM THE LAB Drum Rack is part of Lumlux Art Lab, a set of free browser tools for people who make music. The same drum machine runs on the website, so you can try it before installing anything. Made in Antwerp by FDR-Sound.
Screenshots
Verdict
The clearest difference is device support: Drum Rack at 3 against Audio Object's 1. Drum Rack also leads on iOS requirement (15.0 vs 17.0). On price, ads 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Audio Object | Drum Rack |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 12 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Green Rose Systems, LLC | Frank De Rop |
In-app purchases
Audio Object
No in-app purchases
Drum Rack
No in-app purchases








