Comparison

Elastic OSC vs OkChorale

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

Head to head
About

Elastic OSC

This synthesizer app offers a vast range of sounds inspired by a popular hardware module. It features 24 distinct oscillator models, intuitive XY pads for sound manipulation, and a versatile arpeggiator. Play it with an on-screen or external keyboard for monophonic or polyphonic sound design.

Highlights
  • 24 distinct sound engines based on Plaits DSP
  • Intuitive XY pads for sound manipulation
  • Versatile arpeggiator with multiple modes
  • Integrated help system for all features
  • DX7 bank and wavetable import
  • 5 master effects with automations
Features
Read full description

Elastic OSC is a synthesizer app based on the DSP code of the Mutable Instruments Plaits hardware oscillator module, one of the most beloved (and cloned) oscillator modules in the Eurorack modular scene! Like the original, Elastic OSC comes with a wide variety of possible sounds, from analog-style, FM, and additive sounds to physical modeling, percussive, and even drum sounds. Elastic OSC can be used in both monophonic and 8-voice polyphonic modes. You can play the app using the (on-screen) keyboard or an external keyboard or sequencer inside your DAW of choice. The app focuses on ease of use, featuring two XY pads for intuitive sound manipulation of the OSC engine and the effects. Despite the simplicity of the cleaned-up interface, the sound possibilities are vast – thanks to 24 different oscillator models and the ability to automate parameter changes, as it is possible in all Elastic apps released so far. A versatile Arpeggiator makes it easy to start with simple ideas or can already create entire sonic worlds. Elastic OSC includes an integrated help system (tap “?”) to provide explanations for nearly every GUI element, the underlying DSP model, and most of the app’s functionality. CDM: "Elastic OSC becomes a must on iOS. It’s fun to use as an instrument in your iPad DAW of choice." SYNTH ANATOMY: "Takes the Mutable Instruments (Plaits) algorithms on a wild trip. A nearly perfect app." ROBERT LIPPOK: "Elastic OSC is incredibly fun to work with from the very first minute. The GUI is really well thought out and has 24 integrated synthesis models, as well as the ability to load DX7 sound banks. Omg, so good." --- FEATURES --- SYNTHESIZER – 24 different Sound Engines from MI Plaits DSP code – 4 main parameters per synth engine (Frequency, Harmonics, Morph, Harmo) – Recordable Modulations/Automations for almost all Parameters with a length of 1, 2 or 4 beats. – ADSR Envelope for Amplifier – LPG Envelope for Modulations of Timbre, FM, Harmonics – Adjustable Velocity effect on Volume and/or LPG Modulation – DX7 Bank and Wavetable Import ARPEGGIATOR With different Arp Modes, Rates, Octave Ranges and Skip Notes functionality MASTER FX – 5 effects (5 different Overdrive/Distortions, Hi-Low-Filter, Chorus/Flanger, Delay, Reverb) – Automations for all effects parameters – Master Gain and switchable Limiter effect SYNTH ENGINES - Virtual Analog - Waveshaping - 2 OP FM - Granular Formant - Additive - Wavetable - Chords - Speech - Granular Cloud - Filtered Noise - Particle Noise - String Model - Modal Resonator - Bass Drum - Snare Drum - Hi-Hat - Virt. Analog VCF - Phase Distortion - 6 OP FM 1 - 6 OP FM 2 - 6 OP FM 3 - Wave Terrain - String Machine - Chiptune —————— LFOs LFO 1 is for free, while three additional LFOs can be unlocked via In-App Purchase. LFO MODULATION TARGETS • Frequency Amount • Timbre Amount • Morph Amount • Harmonics Amount • Filter Amount • Pan Amount LFO MIX The MIX view enables you to blend multiple LFOs and define how strongly each active LFO influences a target parameter. The closer a target is placed to an LFO corner, the stronger its influence. All active LFOs always sum up to 100% (e.g. LFO1 50%, LFO2 30%, LFO3 20%).

About

OkChorale

This audio effect plugin offers stereo chorus and vibrato inspired by analog stomp boxes. It allows for modulation of delay times to create classic sound effects, with adjustable rate and depth. It can be used standalone or within compatible music production applications.

Highlights
  • Stereo chorus and vibrato effect
  • Analog stomp box inspiration
  • Adjustable modulation rate (0.1-10.0 Hz)
  • Adjustable modulation depth
  • Chorus and Vibrato modes
  • AUv3 compatible
Read full description

OkChorale Chorus / Vibrato Plugin (AUv3) OkChorale is an audio effect plugin that can run standalone, or in any AU compatible host application such as Logic or GarageBand. Overview OkChorale is a stereo chorus / vibrato effect inspired by classic analog stomp boxes. While not intended to be a model or replica of a specific unit, the processing and features embrace a bygone era of simpler times! Both chorus and vibrato effects are achieved by modulating the time of a delayed version of the dry signal. Typically, these delay times are very short, between 5-20ms. Parameters Active - Toggles the effect On or Off. Rate - Varies the modulation LFO frequency between 0.1-10.0 Hz. Typically, chorus sounds better with slow modulation, and vibrato is more noticeable and natural with higher rates. Depth - Sets the amount of delay modulation, as a percentage of the maximum modulation delay time. Mode - Toggles between Chorus and Vibrato mode. In Vibrato mode, the base delay time is very short and no dry signal is present in the plugin's output. In Chorus mode, the delay time is longer, and the dry signal is mixed with the delayed version. When used in stereo, the left and right channel's modulation is out of phase to create a wide stereo effect. The modulation wave shape is also different, depending on the mode. In Vibrato mode, a sine wave is used. In Chorus mode, a slightly rounded, and more "analog-like" triangle wave is used. Despite the basic design and lack of features, we hope you agree that OkChorale can still sound pretty OK! If the name sounds familiar, OkChorale is a version of the OK CHORALE module developed for Voltage Modular by Waverley Instruments. For more info and support please visit: www.waverley-instruments.com/robjackson

Screenshots

Elastic OSC4 screens
OkChorale1 screens

Verdict

The call

The clearest difference is price: OkChorale at $1.99 against Elastic OSC's $17.99. OkChorale also leads on in-app purchases (none vs 2) and update cadence (every 3 days vs fortnightly). Elastic OSC's advantage is ratings volume (39 vs 5). On ads, monetization model, device support and iOS requirement 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

Elastic OSC costs $17.99 and OkChorale $1.99 up front. Elastic OSC sells 2 one-off in-app purchases. OkChorale asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OkChorale holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Elastic OSC has 39 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 92% of Elastic OSC's written reviews are positive against 100% of OkChorale's.

UpkeepUpdate frequency

Elastic OSC ships an update fortnightly, OkChorale every 3 days. The most recent releases landed on September 23, 2026 and August 25, 2026 respectively.

Scorecard6 real differences · 4 level
Elastic OSC versus OkChorale: the parameters behind the verdict, then further details
ParameterElastic OSCOkChorale
Price$17.99$1.99 — better
Rating4.7 (39 ratings)5.0 (5 ratings) — better
Positive reviews92.0% of reviews100.0% of reviews — better
Number of ratings39 — better5
Update frequencyFortnightlyEvery 3 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS12.012.0
Further details — not scored
Size58 MB12 MB
Age rating4+4+
DeveloperOliver Greschke (DE)Rob Jackson

Customer experience

Elastic OSC

All ratings39 ratings
Positive92.3%
Neutral2.6%
Negative5.1%
Written reviews25 reviews
Positive92.0%
Neutral4.0%
Negative4.0%

OkChorale

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Elastic OSC

One-time2
  • Multi LFOs$3.99
  • Unlock MPE for expressive control$4.99
None

OkChorale

No in-app purchases

Questions

Is Elastic OSC free?
Elastic OSC costs $17.99, and also offers in-app purchases.
Is OkChorale free?
OkChorale costs $1.99, with no in-app purchases.
Which has better reviews, Elastic OSC or OkChorale?
OkChorale is rated higher. Elastic OSC averages 4.7 out of 5 from 39 ratings, while OkChorale averages 5.0 from 5 ratings.
Do Elastic OSC or OkChorale have ads?
Neither Elastic OSC nor OkChorale shows ads.
Which is updated more often, Elastic OSC or OkChorale?
Elastic OSC ships an update fortnightly, and OkChorale every 3 days. Most recently, Elastic OSC was updated on September 23, 2026 and OkChorale on August 25, 2026.

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