Comparison

iDensity vs Matrix Vocoder

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Matrix Vocoder

Transform your voice into an electronic instrument with this app, simulating classic analog vocoder sounds. It analyzes input signals, performs spectral analysis, and reassembles synthetic speech using filter banks and replacement signals.

Highlights
  • 32 channel filterbank with analog filters
  • Stereophonic synthesis with alias-free oscillators
  • External carrier input
  • Voiced/Unvoiced detection and pitch tracking
  • Formant shift
  • Patchbay for channel connection
  • 16 internal oscillators for choir sounds
Features
Currently charting
Read full description

Matrix Vocoder transforms your voice into an electronic instrument! The Vocoder was invented by Homer Dudley in the mid-30's of the last century. Dudley worked at Bell Laboratories, and this is where the first Vocoder took shape. The Matrix Vocoder is designed to properly simulate the classic analog Vocoder sound made famous e.g. by the music of the german band Kraftwerk. At there last world tour they used in fact the PC version of our Matrix Vocoder on stage ! The epic Cylon Robot voice is The basic function of a Vocoder is characterised by an analysis of the input signal, usually speech but other type of inputs can also be very interesting. In a special filter bank, a spectral analysis is performed and signals are developed which follows the amount of spectral energy in each channel. Another part of the analyser tests if there are unvoiced or voiced sounds at any particular time and extracts the pitch of the voiced sounds. The output section of the vocoder consists of a stereophonic synthesis filter bank which assembles the new synthetic speech from the characteristic filter envelopes from the analysis stage together with an external or internal replacement signal. - 32 channel Filterbank with 8-pole Butterworth analog filters - Stereophonic synthesis with analog modelled alias free oscillators. - External carrier possible ( left channel = voice / right channel = carrier ) - Voiced/Unvoiced detection - Pitch tracking - Formant shift - Matrix uses patchbay to connect analysis and synthesis channels. - Pan position and level for each channel. - 16 internal oscillators with unlimited voices for choir like sounds. - Stereo wide panorama parameter for internal generator. - Optional monophonic generator with Glide setting. - Internal noise generator. - Effect AudioUnit and Music Effect AudioUnit - stand alone / Audiobus 3 / IAA

Screenshots

iDensity4 screens
Matrix Vocoder4 screens

Verdict

The call

The clearest difference is review sentiment: iDensity at 86% against Matrix Vocoder's 42%. iDensity also leads on rating (4.9 vs 4.3) and update cadence (monthly vs every 15 months). Matrix Vocoder's advantage is price ($5.99 vs $9.99) and chart position (#178 vs unranked). On ratings volume, ads, in-app purchases and monetization model 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

iDensity costs $9.99 and Matrix Vocoder $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

iDensity holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 48 and 20 respectively. Written reviews point the same way: 86% of iDensity's written reviews are positive against 42% of Matrix Vocoder's.

UpkeepUpdate frequency

iDensity ships an update monthly, Matrix Vocoder every 15 months. The most recent releases landed on October 21, 2026 and October 9, 2026 respectively.

Scorecard6 real differences · 5 level
iDensity versus Matrix Vocoder: the parameters behind the verdict, then further details
ParameteriDensityMatrix Vocoder
Price$9.99$5.99 — better
Rating4.9 (48 ratings) — better4.3 (20 ratings)
Positive reviews86.1% of reviews — better41.7% of reviews
Number of ratings48 — better20
Update frequencyMonthly — betterEvery 15 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank—#178 — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.6 — better
Further details — not scored
Size17 MB9 MB
Age rating4+4+
DeveloperapeSoftHarry Gohs

Customer experience

iDensity

All ratings48 ratings
Positive97.9%
Neutral0.0%
Negative2.1%
Written reviews79 reviews
Positive86.1%
Neutral2.5%
Negative11.4%

Matrix Vocoder

All ratings20 ratings
Positive85.0%
Neutral0.0%
Negative15.0%
Written reviews12 reviews
Positive41.7%
Neutral16.7%
Negative41.7%

Bugs and 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)
Show 5 more
  • 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
Show 5 more
  • 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

Matrix Vocoder

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

iDensity

No in-app purchases

None

Matrix Vocoder

No in-app purchases

Questions

Is iDensity free?
iDensity costs $9.99, with no in-app purchases.
Is Matrix Vocoder free?
Matrix Vocoder costs $5.99, with no in-app purchases.
Which has better reviews, iDensity or Matrix Vocoder?
iDensity is rated higher. iDensity averages 4.9 out of 5 from 48 ratings, while Matrix Vocoder averages 4.3 from 20 ratings.
Do iDensity or Matrix Vocoder have ads?
Neither iDensity nor Matrix Vocoder shows ads.
Which is updated more often, iDensity or Matrix Vocoder?
iDensity ships an update monthly, and Matrix Vocoder every 15 months. Most recently, iDensity was updated on October 21, 2026 and Matrix Vocoder on October 9, 2026.

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