Addictive Pro vs KASPAR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Addictive Pro
This app offers a powerful hybrid synthesis engine for creating complex and dynamic sounds. Explore wavetable, noise, virtual analog, and FM synthesis with extensive modulation and effects. It includes a polyrhythm arpeggiator and real-time control options for musical inspiration and sound design.
- Hybrid synthesis engine
- Wavetable spectrum synthesis
- Virtual Analog synthesis
- Polyrhythm Arpeggiator
- Real-time parameter control
- Studio-standard effects section
- AudioUnit Instrument support
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The hybrid synthesis algorithm on which Addictive Pro is based provides you with efficient means for easy control of complex sounds far beyond usual sound synthesis methods: Addictive Pro provides you a with unique form of Wavetable oscillators. These Wavetables are generated from the harmonic content and the free digital filter structure entered by the user. The sound of up to 12 of this Wavetable oscillators is then further refined with a classic analog filter available in several 24dB and 12dB forms. For the optional noise part of the sound you can use the same sophisticated digital filter struct as for the wavetable oscillators allowing for a vast variety of ever changing noisescapes. The intelligent sound and rhythm randomizer can be applied to different sound aspects separately for really useful sound design and inspiration. A four part polyrhythm Arpeggiator creates complex rhythmical structures with a touch of a finger. Features: Hybrid synthesis engine • Wavetable spectrum synthesis • Noise spectrum synthesis • Virtual Analog synthesis • FM and Ringmodulation synthesis Synthesizer details • Twelve wavetable spectrum oscillators per voice. • Morphing between two wave/filter sets. • Waves contain up to 256 partials. • Hand drawn filter structure. • Spectral noise generator using hand drawn filter structure. • Ten major sound parameters each with independent poly LFO and envelope modulators. • Real time parameter control using two X/Y touch pads, the tilt sensors of the iPad and MIDI Controllers. • Monophonic or polyphonic with up to 16 voices. • 300 factory presets, unlimited user presets can be shared. Effect section • Seven studio standard effects concurrently usable: • Oversampled distortion with four different algorithms for antialiased sound. • Low / High equalizer • 8 pole analog Phaser • Flanger • Four line chorus • Stereo/Ping-Pong delay with glitch free delay time change. • Hi end reverberation unit. Four part Polyrhythm Arpeggiator • Uses programmable sequences with up to 32 steps. • Can trigger single notes and chords. • Unique randomizer generates Arpeggios with 100% usability. • Factory arpeggios included, unlimited user arpeggios possible. • For each step you can program tie, accent, transposition and note order Global • Play melodies live with the onscreen keyboard. Unique drag function for slides and vibrato. • AudioUnit Instrument • Audiobus 2 with state saving • Inter App Audio • Ableton Link support • Can use CoreMIDI compatible MIDI Keyboard. • Select from dozens of scales and play them with scale optimized keyboard layout. • Audio recorder with share function. • Share user presets. • Support for virtual MIDI input connections. • Multichannel MIDI Learn for external MIDI controllers. • Ableton Link compatible. • MIDI Tempo sync. Start/Stop Arpeggio. • MIDI bank/program change. • Import function for Addictive Synth presets. • File sharing of presets via iTunes possible
KASPAR
This powerful synthesizer app offers 8 polyphonic engines with extensive morphing, layering, and modulation capabilities. Create complex sounds with 24 oscillators, 8 filters, and built-in stereo effects. It integrates seamlessly with DAWs and other music apps.
- 8 polyphonic synth engines
- Multi-Engine Automorphing
- Extensive modulation system
- Poly aftertouch support
- 2 stereo FX busses
- Audio Unit plugin integration
- Inter-App Audio and Audiobus support
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Harness the enormous power of 8 polyphonic synths: meet KASPAR Supersynthesizer! Featuring our cutting edge Multi-Engine Automorphing SuperSynthesis technology, KASPAR is a gigantic machine. A total of 24 oscillators, 8 filters, 8 arps; extensive morphing, automorphing, and layering abilities; a powerful modulation system; poly aftertouch; 2 FX Busses filled with fully stereo Yonac effects — just a few of the amazing features of this behemoth synth! KASPAR comes with tons of pro features. In addition to extensive MIDI capabilities, Inter-App Audio, and Audiobus, it also works as an Audio Unit plug in. Just fire it up in GarageBand or your favorite DAW for even more KASPAR goodness! Top Notch Sound Generation • 8 fully-featured polyphonic synth engines, each with, — 3 oscillators (24 systemwide total!) — Over 20 unique waveforms per oscillator — Special 6-stage ‘dADSHR’ envelopes — 14 types of filters to choose from — Dedicated filter envelope — Arpeggiator with multiple modes — Chordmaker - easily program & play chords by touching a single key — Powerful modulation features (see below) Extensive Modulation • Each synth has a dedicated mod assign matrix with 6 slots • 20 mod targets to choose from, including pitch, timbre, filters and more • Each target can be modulated by a continuous signal, as well as a control signal • 2 LFOs per synth • Modulation envelope • Poly aftertouch • Velocity, Mod Wheel & Key Tracking Morphing • 4 morph groups with onscreen control pad • Automorphing: simply draw a figure on the pad and KASPAR automatically tracks it • Modulate the morph using the x- and y-controls • 6 automorph trigger modes • 4 automorph looping modes • Adjustable, beat-syncable pathread & modulation speeds Layering • Combine the 8 KASPAR synth engines in infinite ways • Each synth comes with dedicated volume and panning, as well as FX1 & FX2 send controls • Conveniently map the synths to regions of the keyboard: great for ‘splitting’ or ‘layering’ multiple synth patches • Each engine has its own transpose & drift controls, as well as adjustable pitch bending, velocity, and aftertouch ranges Professional FX • Two independent FX busses • Each bus contains 8 state-of-the-art stereo FX specially designed for KASPAR • Simply drag-and-drop to change FX signal flow • FX include: — Analog-modeling compressor — 6 band parametric EQ with 9 filter options per band — Stereo chorus with 10 parameters — Stereo phaser — Stereo flanger — Amplifier with 4 virtual circuit types and 4 cabinet types — Stereo delay with BPM syncing — Algorithmic reverb with 14 parameters Professional Features • Standalone app features Inter-App Audio, Audiobus, and Ableton Link • Comes packaged with FREE Audio Unit plugin, with native processing at any standard sample rate • Crystal clear, super high quality audio generation • Virtual ribbon control with polyphonic aftertouch, as well as classic keyboard • Virtual KB velocity with adjustable sensitivity • Extensive MIDI Learn options • MIDI Maps manager with MIDI CC profile saving • Over 300 high quality presets, including an exclusive bank by New Wave Presets • Powerful preset management system: save, share & edit presets System Requirements • Recommended for iPad Air, iPad Pro, iPad Mini 2, or newer
Verdict
The clearest difference is price: Addictive Pro at $5.99 against KASPAR's $19.99. Addictive Pro also leads on update cadence (every 2 weeks vs every 16 months). KASPAR's advantage is ratings volume (91 vs 18). On rating, review sentiment, ads and in-app purchases 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
Addictive Pro costs $5.99 and KASPAR $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.7 for Addictive Pro against 4.6 for KASPAR. That said, the two scores are not equally well evidenced: KASPAR has 91 ratings behind it against 18, so its average is the more settled of the two. Written reviews split almost evenly too, at 75% and 75% positive.
Addictive Pro ships an update every 2 weeks, KASPAR every 16 months. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.
| Parameter | Addictive Pro | KASPAR |
|---|---|---|
| Price | $5.99 — better | $19.99 |
| Rating | 4.7 (18 ratings) — better | 4.6 (91 ratings) |
| Positive reviews | 75.0% of reviews | 75.0% of reviews |
| Number of ratings | 18 | 91 — better |
| Update frequency | Every 2 weeks — better | Every 16 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPad |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 58 MB | 64 MB |
| Age rating | 4+ | 4+ |
| Developer | Harry Gohs | Yonac Inc. |
Customer experience
Addictive Pro
KASPAR
Bugs and requests
Addictive Pro
Not enough reviews yet to summarise bugs or requests.
KASPAR
Reported bugs
12 issues- Sound muted in solo mode for some synths
- Synth crashes when loading as AUv3 in Roland Zenbeats
- FX chain not working
- Program change messages not followed as AUv3 in Cubasis internal track
- UI does not scale to full screen in Cubasis 3
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- App crashes when clicking 'help' offline
- Random crashes inside host (GarageBand/Cubasis) as AUv3
- Multiple instances play simultaneously when track is not armed
- Keeps crashing in BeatMaker 3 as AUv3
- Does not fit screen correctly in Cubasis 3
- Modulation matrix has issues with aftertouch modulating cutoff frequency
- Copying presets between layers gets messed up with aftertouch modulation
Requested features
11 requests- Add a step sequencer
- Improve preset variety and inspiration
- Fix AUv3 program change issues
- Address UI scaling problems in DAWs
- Implement MIDI out functionality
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- Expand modulation matrix capabilities
- Fix aftertouch modulation issues
- Integrate help within the app
- Relocate performance buttons to Morph page
- Add master volume control to Morph page
- Add Bluetooth audio support
In-app purchases
Addictive Pro
No in-app purchases
KASPAR
No in-app purchases








