Air vs iDensity
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Air
This app creates a unique, ever-changing audio-visual experience using vocal and piano samples. Users can influence the composition through different modes and even spread the sound across multiple devices.
- Generative audio-visual composition
- Vocal and piano sample assembly
- Four 'Conduct' modes for user control
- Three 'Listen' modes for arrangement choice
- Multi-device sound spreading option
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Air is a generative audio-visual work created by musician / software designer Peter Chilvers and Irish vocalist Sandra O’Neill. Based on concepts developed by Brian Eno, with whom Chilvers created Bloom, Air assembles vocal and piano samples into a beautiful, still and ever changing composition, which is always familiar, but never the same. Air features four ‘Conduct’ modes, which let the user control the composition by tapping different areas on the display, and three ‘Listen’ modes, which provide a choice of arrangement. For those fortunate enough to have access to multiple iPhones and speakers, an option has been provided to spread the composition over several players. Recommended for headphones and external speakers. "Air is like 'Music for Airports' made endless - which is how I always wanted it to be" - Brian Eno
iDensity
This app offers real-time asynchronous sound file granulation, enabling users to create a wide array of audio effects. It provides tools for time/pitch manipulation, texture generation, buffer recording, and complex sound exploration. Designed for musicians and sound designers, it offers flexibility for live performance, studio composition, and on-the-go sound design.
- Real-time sound granulation
- Time/pitch shifting and jittering
- Texture generation
- Buffer recording and manipulation
- Scrub pad exploration
- Dynamic envelope shaping
- Audio Unit (AUv3) support
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iDensity is rated as a Killer App by Apps4iDevices. iDensity is a new real-time software designed for asynchronous sound file granulation, a genuine granular playground able to generate a wide range of usual and not so usual effects: time/pitch shifting, time/pitch jittering, intricate textures, grain fountain/pulverizer, recording and manipulation of buffers, complex scrub pad exploration, dynamic envelope shape and many more. iDensity for iPad will give you all the basic and advanced tools you need to manipulate sound in subtle and surprising ways. All these features are packed in an optimized, user-friendly, visually sharp interface that is easy to access when fast-improvising live, composing in a studio, or sound designing at home and on the go! You will have the power, freedom, and flexibility to create like never before – on your iPad! Control and shape grains, anytime, anywhere with Density for iPad. + Six Granular Streams + Six Remote Audio Units Host support + Full Instr and FX AudioUnit (AUv3) support + High Density Granulation + Sampled and Live granulation + In-Stream Echo and RM post Fx + Multichannels Audiobus Inter-App Audio support + MIDI, Virtual Midi and Network + Sharing common audio files via iTunes, Dropbox AudioCopy etc... + Snapshots Presets Morphing Pad + Post Fx chain: Parametric and High Shelf Filters, Classic Reverb and Dynamics Processor + Scrub Recording and playback + etc.
Screenshots
Verdict
The clearest difference is price: Air at $1.99 against iDensity's $9.99. Air also leads on chart position (#168 vs unranked) and iOS requirement (9.0 vs 15.6). iDensity's advantage is review sentiment (86% vs 55%) and update cadence (monthly vs every 12 months). On ads, in-app purchases, monetization model 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
Air costs $1.99 and iDensity $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
iDensity holds the better App Store score, 4.9 against 4.5. Both are backed by a comparable volume of ratings — 10 and 48 respectively. Written reviews point the same way: 55% of Air's written reviews are positive against 86% of iDensity's.
Air ships an update every 12 months, iDensity monthly. The most recent releases landed on September 27, 2026 and September 21, 2026 respectively.
| Parameter | Air | iDensity |
|---|---|---|
| Price | $1.99 — better | $9.99 |
| Rating | 4.5 (10 ratings) | 4.9 (48 ratings) — better |
| Positive reviews | 55.3% of reviews | 85.7% of reviews — better |
| Number of ratings | 10 | 48 — better |
| Update frequency | Every 12 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #168 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 33 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Opal Limited | apeSoft |
Customer experience
Air
iDensity
Bugs and requests
Air
Not enough reviews yet to summarise bugs or requests.
iDensity
Reported bugs
10 issues- Occasional crashes (historically)
- AudioBus issues (historically)
- Preset management not working correctly (historically)
- Transport sync not working (historically)
- GUI bugs (e.g., maximizing a strand)
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- Craquements, grésillements (cracking, crackling)
- X/Y snapshot morphing not working on iPad 1
- Sample import issues (cut off)
- Unable to record from microphone (historically)
- App crashes upon recording (historically)
Requested features
10 requests- Independent MIDI note control over pitch for each stream
- Alphabetical preset sorting
- Load existing project name into 'Save As'
- Multi-port output for AUM/Ape Matrix
- Built-in wave-editor for sample cutting
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- Ability to determine loop length
- Motion sequencer or assignable LFOs
- Sync AU3 transport to host (historically)
- Add MIDI note and channel select as modifier/controller
- Dark mode option
In-app purchases
Air
No in-app purchases
iDensity
No in-app purchases









