Comparison

Modulin vs RRS Ivoks

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

Head to head
About

Modulin

This app is a highly customizable analog modeling synthesizer designed for personal expression. It offers a wide range of visual feedback, sound modulation options, and built-in effects. Users can create, record, and share their musical creations.

Highlights
  • Customizable analog modeling synthesizer
  • LFO with four wave types
  • Low-pass filter and glide effect
  • Built-in reverb, delay, and chorus
  • Multi-track recording and playback
  • Synthesis exploration area
  • MIDI CC mapping
Features
Read full description

Modulin is the world's most customizable synthesizer. It allows for unique personal expression while providing a wide spectrum of visual feedback. The playful colored strings are visually appealing while providing the user with fluent modulation of Modulin's LFO. The LFO replicates the vibrato effect heard throughout an orchestra or choir. The LFO can be set to four different wave types: Sinuous, Triangle, Sawtooth, and Square. It also can be set to a wide variety of frequency ranges. Modulin's oscillator can also be set to these four waveforms, but its pitch is controlled by the strings and a tuning knob. A simple low-pass filter allows you to cut off the unnecessary frequencies. The glide rate knob on Modulin creates a fluent portamento effect and allows for some pretty cool instrument replications. A slider located in the middle of the effects view can be dragged to reveal different effects and extra sound makers. Modulin includes reverb, delay, and chorus. It also contains a separate white noise module. Modulin simulates paraphonicness by allowing for a second VCO multiplied to form a gap of up to 2 octaves. Below all the knobs, an ADSR control allows you to manipulate the attack, decay, sustain, and release of your sounds. Modulin truly is the complete package for channeling your inner-composer. It can even record and store your works of art. A record button allows you to lay down a beat and overwrite it with complex melodies. The tracks button allows you to manage your tracks as you add them. New to synthesis? No problem. Modulin has an explore section that takes you through every component in an analog synthesizer, describing what it does alongside a diagram of how signals flow through it. Master of all things musical? Modulin's got you covered again. You can change the root note, octave, and type of scale that Modulin uses. If you feel really confident, you could even turn off the note names in the settings and try to memorize where everything is. With over 40 presets and other preset packages to buy, you will never run out of new and unique sounds. Even if you do, you can create your own and save it for later or share it with friends by the swipe of your finger. Fat fingers? Don't worry. With Modulin’s design, you can plug in an external MIDI keyboard and play it however you like. You can even map certain knobs on Modulin to knobs on your keyboard. It's magic! The more you explore Modulin, the more fun it becomes. You can personalize it by adding your own custom color or amp up the expression through the pressure sensitivity setting. FEATURES ・Comes with over 40 presets (More available through Modulin’s store) ・Easily share presets and recordings with friends ・MIDI CC mapping ・Amazing digital synth sounds ・Multi track recordings ・Synthesis exploration area ・22 Scales (With the ability to add your own) ・Save custom presets ・Favoritize presets for quick and easy access ・Built-in metronome for playing in time ・Customizable color ・Toggling of note labels ・Fun flexible strings and an oscilloscope in the upper corner give a great level of feedback ・Effortless and intuitive design SUPPORTS ・All 64-bit iOS devices ・External MIDI controllers ・Bluetooth MIDI controller ・Audiobus and Inter-App Audio ・Share custom preset files over AirDrop, Mail, or other 3rd party applications ・3D Touch LFO Modulation ・Drag and Drop for Presets

About

RRS Ivoks

This app emulates analog synthesizers, offering a range of sound shaping tools including oscillators, filters, and amplifiers. It supports AUv3 hosting for integration with music production apps and provides extensive MIDI control.

Highlights
  • Analog Emulation
  • AUv3 Compatible
  • Dual Oscillators
  • Filter Block with ADSR
  • Amplifier Block with ADSR
  • Modulation (LFO) Controls
  • MIDI CC Implementation
Read full description

RRS Ivoks AUv3 instrument — comes as time-limited Demo-version for you to try. It gives you 5 minutes of Free play time. (You can reload the RRS Ivoks AUv3 instrument as many times as you want, thereby you get the Demo period again and again.) Unlimited version of RRS Ivoks AUv3 instrument comes as In-App Purchase. Features: • Analog Emulation; • Undo/Redo; • A/B comparison; • 2x/4x/8x Upsampling; • Macro controllers; • Scalable GUI. On the centre panel are located two audio-frequency oscillators: • OSC1 offers frequency Band regulator, five Waveforms and controls for LFO Modulation level plus OSC2 Cross-modulation; • OSC2 offers the same frequency Band and Waveforms, an independent control for Modulation depth, plus Detuning. Underneath these located the mixer, which offers level controls for the two Oscillators, the Noise generator, and Saturation Drive. To the right of these, located the filter block. The top half is a standard ADSR envelope — until you flip the switch «Envelope mode», when it becomes a repeating AD-envelope instead. The four controls at the bottom adjust Cut-off, Resonance, LPF to BPF switch, Modulation level and Envelope level. Next after the filter is the amplifier block, it also has ADSR envelope along with another Modulation level and Velocity sensitivity control. Again, the envelope can be switched to a Repeating Mode that generates a triangular waveform determined by the Attack and Decay settings, providing some of the instrument’s most distinctive effects. The leftmost panels house the Modulation (LFO) controls (top), Mode which offers four waveforms, including noise, and a stepped Function for sample & hold (S&H) effects, well as Speed control. And global settings such as the master Tune, master Volume, Legato mode, Monophonic and Duophonic operation and Unison switches, and the Glide control. To use Ivoks as an instrument, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — RRS Ivoks will appear in the list of Audio Unit instruments in the host app. MIDI CC Implementation Chart: • CC#003 => HQ • CC#009 => Saturation Drive • CC#014 => Modulator Speed • CC#015 => Modulator Mode • CC#020 => Filter Attack • CC#021 => AMP Attack • CC#022 => Filter Decay • CC#023 => AMP Decay • CC#024 => Filter Sustain • CC#025 => AMP Sustain • CC#026 => Filter Release • CC#027 => AMP Release • CC#028 => Filter Envelope Mode • CC#029 => AMP Envelope Mode • CC#030 => OSC1 Band • CC#031 => OSC2 Band • CC#085 => OSC1 Waveform • CC#086 => OSC2 Waveform • CC#087 => OSC1 XMod • CC#089 => OSC2 Detune • CC#090 => MOD to OSC1 • CC#102 => MOD to OSC2 • CC#103 => OSC1 Level • CC#104 => OSC2 Level • CC#105 => Noise Generator • CC#106 => Global Tune • CC#107 => Global Glide • CC#108 => Global Volume • CC#109 => Global Voice • CC#110 => Global Unison • CC#111 => Global Retrig • CC#112 => Filter Cut-off • CC#113 => Filter Resonance • CC#114 => Filter Mode • CC#115 => MOD to Filter • CC#116 => Filter Envelope • CC#117 => MOD to AMP • CC#118 => Velocity Sensitvity

Screenshots

Modulin4 screens
RRS Ivoks4 screens

Verdict

The call

The clearest difference is update cadence: Modulin at every 5 days against RRS Ivoks's fortnightly. On price, rating, review sentiment and ratings volume 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

Both are free to download. Modulin sells 1 one-off in-app purchase and RRS Ivoks sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.3 for Modulin against 4.4 for RRS Ivoks. Both are backed by a comparable volume of ratings — 18 and 46 respectively. Written reviews are what separate them: 69% of Modulin's written reviews are positive against 63% of RRS Ivoks's.

UpkeepUpdate frequency

Modulin ships an update every 5 days, RRS Ivoks fortnightly. Both last shipped on October 24, 2026.

Scorecard1 real difference · 9 level
Modulin versus RRS Ivoks: the parameters behind the verdict, then further details
ParameterModulinRRS Ivoks
PriceFreeFree
Rating4.3 (18 ratings)4.4 (46 ratings) — better
Positive reviews69.2% of reviews — better63.3% of reviews
Number of ratings1846 — better
Update frequencyEvery 5 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.010.0
Further details — not scored
Size29 MB19 MB
Age rating4+4+
DeveloperGrant EmersonRRS, OOO

Customer experience

Modulin

All ratings17 ratings
Positive76.5%
Neutral11.8%
Negative11.8%
Written reviews13 reviews
Positive69.2%
Neutral15.4%
Negative15.4%

RRS Ivoks

All ratings45 ratings
Positive82.2%
Neutral4.4%
Negative13.3%
Written reviews30 reviews
Positive63.3%
Neutral3.3%
Negative33.3%

In-app purchases

1 purchases

Modulin

One-time1
  • PhilharmodulinFree
1 purchases

RRS Ivoks

One-time1
  • RRS Ivoks Unlimited$8.99

Questions

Is Modulin free?
Modulin is free to download, with in-app purchases available.
Is RRS Ivoks free?
RRS Ivoks is free to download, with in-app purchases available.
Which has better reviews, Modulin or RRS Ivoks?
RRS Ivoks is rated higher. Modulin averages 4.3 out of 5 from 18 ratings, while RRS Ivoks averages 4.4 from 46 ratings.
Do Modulin or RRS Ivoks have ads?
Neither Modulin nor RRS Ivoks shows ads.
Which is updated more often, Modulin or RRS Ivoks?
Modulin ships an update every 5 days, and RRS Ivoks fortnightly. Most recently, Modulin was updated on October 24, 2026 and RRS Ivoks on October 24, 2026.

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