Comparison

Klankwelle vs Audulus 4

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

Head to head
About

Klankwelle

This app allows users to create and manipulate complex synthesizer sounds using a modular interface. Build up to eight synthesizers simultaneously, controlling them via an on-screen keyboard, step sequencer, or external MIDI devices. Fine-tune audio with built-in effects and an equalizer.

Highlights
  • Modular synthesizer creation
  • Up to 8 synths simultaneously
  • Built-in keyboard and step sequencer
  • External MIDI support
  • Dynamic compressor
  • 10-band graphic equalizer
  • Extensive module library (oscillators, filters, effects)
Features
Read full description

Klankwelle is a modular synthesizer for iOS. Create up to 8 synthesizers at once and control them with a built-in keyboard or a 16-part step sequencer. Or play them with an external MIDI source. Fine-tune your sounds with a dynamic compressor and a 10-band graphic equalizer. Making a new synthesizer is easy: just add modules with a double-tap and wire up your architecture by dragging between connectors. Available modules include: OSCILLATORS Sine, Square, Sawtooth, Triangle, Noise, Ring FILTERS Lowpass, Highpass, Bandpass, Allpass, Notch, Peak, Formant ENVELOPES Linear, Quadratic EFFECTS Fuzz, Comb, Echo, Bitcrush, Auto Gain LOW-FREQUENCY OSCILLATORS Sine, Square, Sawtooth, Triangle, Linear Trigger ARITHMETIC Add, Subtract, Multiply, Convolution FEEDBACK CTRL Supported MIDI messages: Note on/off (velocity sensitive), Pitch bend, control change, program change

About

Audulus 4

Create and shape sounds with a professional-grade modular synthesizer environment. Explore a vast library of modules for synthesis and sound design, with the option to expand your toolkit with premium instruments and effects. Available across Apple devices for seamless workflow.

Highlights
  • Modular synthesizer environment
  • Sound design tools
  • Real-time audio shaping
  • Extensive module library
  • Premium Pro Modules (in-app purchases)
  • Cross-device iCloud sync
  • AUv3 plugin support
Features
Read full description

Build synthesizers. Design sounds. Shape audio in real time. All with professional-grade, low-latency performance ready for live use — and it’s free. Audulus gives you a complete modular environment at no cost. Its clean, fluid interface stays out of the way so you can focus on what matters: exploring sound. A modular playground with room to grow — from first experiments to advanced designs. Looking for more? Discover the Pro Module series: premium instruments and effects that show what’s possible when world-class sound design meets true modular freedom. Each Pro Module is crafted specifically for Audulus, giving you new ways to expand your sonic toolkit. Available on iPhone, iPad, and Mac — your modular system travels with you. ▶ What People Are Saying: "gem for Apple platforms – gorgeous, fluid" — Peter Kirn, createdigitalmusic.com "stunning!" — Richard Devine, devinesound.net "Remarkable gesture control" — sequencer.de ▶ Join our forum and Discord community! ▶ What You Get: • Complete modular environment — free to download and explore • Pro Module series — premium modules available as in-app purchases • Available on iPhone, iPad, and Mac with iCloud sync • Standalone app or AUv3 plugin • Deep node library for building from scratch • Extensive module library for synthesis and sound design • Multi-channel signal flow for polyphony and complex routing • Next-gen multi-core audio processing • Smooth, high-performance graphics even with massive patches • MIDI I/O with MIDI learn • GLSL shader node for creating advanced visuals • Lua scripting for custom DSP and vector graphics Terms of Use: https://audulus.com/terms.html

Screenshots

Klankwelle3 screens
Audulus 44 screens

Verdict

The call

The clearest difference is in-app purchases: Klankwelle at none against Audulus 4's 27. Klankwelle also leads on rating (4.7 vs 4.3) and review sentiment (91% vs 69%). On price, ratings volume, update cadence and ads 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. Audulus 4 sells 27 in-app purchases, starting at $4.99 per month. Klankwelle asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Klankwelle holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 37 and 74 respectively. Written reviews point the same way: 91% of Klankwelle's written reviews are positive against 69% of Audulus 4's.

UpkeepUpdate frequency

Klankwelle ships an update every 2 months, Audulus 4 monthly. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

Scorecard5 real differences · 5 level
Klankwelle versus Audulus 4: the parameters behind the verdict, then further details
ParameterKlankwelleAudulus 4
PriceFreeFree
Rating4.7 (37 ratings) — better4.3 (74 ratings)
Positive reviews90.9% of reviews — better69.2% of reviews
Number of ratings3774 — better
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS10.0 — better18.0
Further details — not scored
Size17 MB103 MB
Age rating4+4+
DeveloperGreg OkopalAudulus LLC

Customer experience

Klankwelle

All ratings37 ratings
Positive91.9%
Neutral8.1%
Negative0.0%
Written reviews22 reviews
Positive90.9%
Neutral9.1%
Negative0.0%

Audulus 4

All ratings74 ratings
Positive82.4%
Neutral4.1%
Negative13.5%
Written reviews78 reviews
Positive69.2%
Neutral10.3%
Negative20.5%

Bugs and requests

Klankwelle

Not enough reviews yet to summarise bugs or requests.

Audulus 4

Reported bugs

13 issues
  • iOS 18 compatibility issues (app not working)
  • Save presets but no 'Load' button
  • Undo command issues with DAWs
  • CMD+Z causing data loss
  • Opt+drag not duplicating modules
Show 8 more
  • Plugin window not resizable
  • Menu filtering not functioning properly on iPhone
  • Select and Import buttons not working
  • Blank screen on open
  • App freezes on iPad Pro
  • Black screen on launch after update
  • No modules appearing after iOS 18 update
  • Patches not appearing after iOS 18 update

Requested features

7 requests
  • Add 'Load' button for presets
  • Improve DAW integration (Undo, duplicate)
  • Resizable plugin window
  • More modules (FFT/IFFT, granular buffering)
  • Add CC in module
Show 2 more
  • Sync to host as AUv3
  • Make upgrade path clearer from Audulus 3

In-app purchases

None

Klankwelle

No in-app purchases

27 purchases

Audulus 4

Subscriptions2
  • Audulus Pro (1 Month)7 Days trial$4.991 Month
  • Audulus Pro (1 Year)7 Days trial$29.991 Year
One-time25
  • 1-shot Sample$1.99
  • P-Train$2.99
  • CLK RS-1$3.99
Show 22 more
  • CG-1 Chord Generator$3.99
  • CLK Clock Generator$4.99
  • MetaEnvelope$4.99
  • Modal Percussion$4.99
  • CLK: TimeWarp$4.99
  • CPR-1$4.99
  • LMT-1$4.99
  • MS-FUNC$5.99
  • CLK SS-516$7.99
  • J-23 Reverb$7.99
  • J-23 Effects$7.99
  • CLK GS-1$7.99
  • Chaos LFO Bundle$7.99
  • ARP-1$7.99
  • CPR-3$7.99
  • SynD-K1$7.99
  • TRIKOR VCO$9.99
  • CLK Tools Bundle$9.99
  • Essential Synth Bundle$9.99
  • VCF Bundle 1$9.99
  • J-23 Space Console$14.99
  • Patch Editing$29.99

Questions

Is Klankwelle free?
Klankwelle is free to download, with no in-app purchases.
Is Audulus 4 free?
Audulus 4 is free to download, with in-app purchases available.
Which has better reviews, Klankwelle or Audulus 4?
Klankwelle is rated higher. Klankwelle averages 4.7 out of 5 from 37 ratings, while Audulus 4 averages 4.3 from 74 ratings.
Do Klankwelle or Audulus 4 have ads?
Neither Klankwelle nor Audulus 4 shows ads.
Which is updated more often, Klankwelle or Audulus 4?
Klankwelle ships an update every 2 months, and Audulus 4 monthly. Most recently, Klankwelle was updated on October 14, 2026 and Audulus 4 on October 6, 2026.

Other comparisons