Comparison

iProphet Synthesizer vs Kauldron Synthesizer

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

Head to head
About

iProphet Synthesizer

This app emulates the classic Sequential Circuits Prophet VS synthesizer, offering its unique digital sound. Sculpt sounds with four digital oscillators, a multimode filter, and extensive modulation options. It includes over 500 presets and integrates with other music production tools.

Highlights
  • Vector screen with joysticks
  • Modulation Matrix
  • 3 DSP effects
  • 96 waveforms
  • 4 filter types
  • Vector envelope
  • Unison/detune
Read full description

When a punchy, fat sound is demanded, look no further. iProphet recreates the unique sound of the classic Sequential Circuits Prophet VS synthesizer. Need help? Have an issue or question? Please email us at support@retronyms.com. The Prophet VS's rareness and classic digital sound make it a mainstay for those who can find them. The sound is purely classic crisp digital sound that easily stands on its own, but at the same time is the perfect compliment to the sound of analog synthesizers. iProphet brings the crystaline vintage sound of four digital oscillators and allows sculpting them using a creamy and warm multimode filter. iProphet comes with over 500 presets created by some of todays best sound designers. Use it in Tabletop to compose your music. You can morph the sound of the 4 oscillators using the joystick or the vector mode and the vector envelope. You can also swap presets between iProphet and Arturia's Prophet V synthesizer which allows you to work on the iPad and finish in the DAW of your choice. iProphet is a Tabletop Ready app. The connect menu allows you to connect iProphet to the Retronyms Tabletop app, giving you an integration with a complete studio environment. Tabletop also features add-ons for more effects and instruments from other 3rd party companies. iProphet supports Core MIDI, interapp-audio as well as Audiobus technologies for perfect integration. The use of the brands 'Prophet' and 'Sequencial Circuits' is done with permission of Dave Smith Instruments. Features Include: - Vector screen with joysticks to mix oscillators and envelopes - Super flexible Modulation Matrix - 3 DSP effects (overdrive, delay, and chorus) - 96 different wave forms to control pitch - 4 filter types - Vector envelope featuring loop points - Unison/detune for beefy sounds - Full user MIDI mapping of panel controls - Tabletop Ready app - Soundcloud seeder (via Tabletop) - Render to .wav file (via Tabletop) - AudioCopy to paste your audio into another iPad application (via Tabletop)

About

Kauldron Synthesizer

This app combines classic analog synth warmth with AI-powered sound design. It offers intelligent preset generation, extensive modulation options, and a powerful arpeggiator for creating rich synth textures.

Highlights
  • AI-powered preset generation (SPAWN²)
  • Analog modeling oscillators
  • Extensive modulation matrix
  • Dual XY-pads for control
  • Powerful arpeggiator
  • AUv3 plugin support
  • Over 900 presets
Read full description

Kauldron is where classic warmth meets Artificial Intelligence. One of our toniest and punchiest synths, Kauldron features a completely new analog modeling technology. The full spectrum of rich synth textures is bolstered by the groundbreaking SPAWN intelligent preset generation system that allows new patches to be created at the touch of a button. Abounding with pure hard-hitting tones, Kauldron requires little to no FX or production gimmicks to sound big. Kauldron is designed with modulation and fine dynamic control in mind. The two fully-featured LFOs and the mod envelope combine with a wide variety of MIDI learnable controls to manipulate multiple parameters. Everything is easily set up in a clearly laid out ‘mod matrix.’ The dual XY-pads can be used for controlling modulation or a wide range of synth parameters. MIDI aftertouch can be routed via the matrix for even greater control over expression and tonality. Kauldron also debuts the next generation of our Artificial Intelligence preset creation system, SPAWN². Completely reimagining the groundbreaking SPAWN algorithms in our hugely popular Magellan, the new SPAWN² gives you unprecedented control over generating presets. In the expert mode, you can accomplish anything from subtle ‘variations on a theme’ to bold new sounds. In the basic mode, where Kauldron does all the thinking, you get preset after usable preset with just a touch. This is not simple randomization: it is the power of A.I. put to benevolent use! Kauldron also includes its AUv3 plugin version so that you can seamlessly run multiple instances in your favorite DAW. Powerful arp with both live & program modes; comprehensive MIDI features with effortless MIDI learn; over 900 presets; recording, sharing, these are just some of the features brewing inside Yonac’s Kauldron. Selected specs include, SYNTH • 3 analog modeling oscillators w/ multiple waveforms & true PWM • FM via Osc 2 • Maximizer module with drift, spread & voice count for huge, stereophonic all-synth sounds • New vAnalog filter design w/ ‘dirt’ overload for even warmer, harmonically complex tones • Dedicated filter ADSR envelope • Filter tracking, contour & more • Pink/white noise generator • Osc. phase reset & sync • Retro & modern glide algorithms • Virtual VCA envelope with 2 attack types • Poly/mono operation • Legato mode for buttery smooth passages • Extensive modulation options via the ‘mod matrix’ • 2 LFOs w/ BPM sync, keytracking, trigger mode & more • Assignable mod envelope • 23 mod targets • 11 mod controllers, including aftertouch, velocity & keytracking • 2 XY-Pads for controlling mod targets or synth parameters • Arpeggiator with live & program modes, 11 algorithms, gate, swing, note value, octaving & more • Stereo mod effect with chorus & flanger modes • BPM-syncable stereo delay • Studio quality reverb w/ 7 room types, damping, time & mix • 900+ presets in a wide variety of styles & sounds SPAWN² • Automatic preset generation via artificial intelligence • Generate infinite new, usable presets at the touch of a button • Expert mode lets specify Variation & Autonomy for each major synth module • 3 unique A.I. algorithms • Auto arp programming in any listed scale PRO FEATURES • AUv3 - use as Audio Unit instrument plugin on iPad & iPhone • Fullscreen AU mode • Extensive MIDI: MIDI learn, aftertouch, MIDI CC map save/share, KB mapping, program changes & more APP • iPhone & iPad Compatibility • Powerful YPAT2 preset management system • Classic or ribbon key controller • Ribbon controller: Poly aftertouch into Kauldron • Ribbon controller: Settable musical key & scale • Classic KB: Velocity w/ sensitivity setting • Tapedeck: Record, loop & share • Metronome • Tap BPM

Screenshots

Kauldron Synthesizer4 screens

Verdict

The call

The clearest difference is review sentiment: Kauldron Synthesizer at 80% against iProphet Synthesizer's 34%. Kauldron Synthesizer also leads on rating (4.6 vs 3.5) and ratings volume (136 vs 31). iProphet Synthesizer's advantage is update cadence (every 5 months vs every 49 months) and iOS requirement (8.0 vs 15.6). On price, 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

iProphet Synthesizer costs $9.99 and Kauldron Synthesizer $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Kauldron Synthesizer holds the better App Store score, 4.6 against 3.5. Both are backed by a comparable volume of ratings — 31 and 136 respectively. Written reviews point the same way: 34% of iProphet Synthesizer's written reviews are positive against 80% of Kauldron Synthesizer's.

UpkeepUpdate frequency

iProphet Synthesizer ships an update every 5 months, Kauldron Synthesizer every 49 months. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

Scorecard6 real differences · 4 level
iProphet Synthesizer versus Kauldron Synthesizer: the parameters behind the verdict, then further details
ParameteriProphet SynthesizerKauldron Synthesizer
Price$9.99$9.99
Rating3.5 (31 ratings)4.6 (136 ratings) — better
Positive reviews34.0% of reviews79.7% of reviews — better
Number of ratings31136 — better
Update frequencyEvery 5 months — betterEvery 49 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS8.0 — better15.6
Further details — not scored
Size85 MB32 MB
Age rating4+4+
DeveloperArturiaYonac Inc.

Customer experience

iProphet Synthesizer

All ratings30 ratings
Positive63.3%
Neutral3.3%
Negative33.3%
Written reviews100 reviews
Positive34.0%
Neutral17.0%
Negative49.0%

Kauldron Synthesizer

All ratings136 ratings
Positive88.2%
Neutral6.6%
Negative5.1%
Written reviews74 reviews
Positive79.7%
Neutral9.5%
Negative10.8%

User reviews

iProphet Synthesizer

From 31 App Store ratings

What we love

  • 🎵 Authentic Prophet VS sound quality and character
  • 🎹 Deep modulation matrix with vector synthesis capabilities
  • 🎚️ Extensive preset library with diverse sounds
  • 🎨 Intuitive visual interface and design
  • 💰 Affordable price point for feature set

Room to improve

  • 🐛 Persistent audio distortion and crackling issues
  • 🐛 Frequent crashes and app freezes
  • 🔌 Poor inter-app audio (IAA) and Audiobus integration
  • 🔋 Excessive battery drain in background
  • ⚠️ Abandoned by developer with no updates

Kauldron Synthesizer

From 136 App Store ratings

What we love

  • ✨ Warm and rich sound
  • 👍 Easy to use interface
  • 💡 Great presets included
  • 🚀 Powerful sound engine
  • 🌟 High quality emulation

Room to improve

  • 🐛 Buggy AUv3 implementation
  • 🔊 Shrill noise issue
  • 🔇 No Bluetooth speaker support
  • ⚠️ Strange behavior/no reset
  • 📉 Lacks oomph/personality

Bugs and requests

iProphet Synthesizer

Reported bugs

15 issues
  • Audio distortion and crackling in all presets
  • App crashes on iOS 14+ versions
  • Inter-app audio (IAA) connection requires multiple restarts
  • Preset changes cause app freezes and audio cutouts
  • Stuck and hanging notes when sliding on keyboard
Show 10 more
  • Modulation settings incorrectly apply across different presets
  • Low-frequency humming loop persists during playback
  • AirPods Max audio quality degradation
  • Audiobus integration causes lockout and screeching
  • iPad goes to sleep during drone playback
  • Save preset function not working
  • Waveform display shows white blocks in Tabletop
  • Sustain pedal not responding to MIDI messages
  • Preset polyphony status changes unexpectedly
  • App becomes unresponsive in DAW environments

Requested features

14 requests
  • AUv3 plugin support for Logic Pro and other DAWs
  • Ability to save custom patches and presets
  • Velocity and aftertouch MIDI support
  • MIDI control for joystick parameter
  • User-defined waveform creation
Show 9 more
  • Full 8-note polyphony support
  • Background audio playback capability
  • MIDI output functionality
  • Master transpose feature
  • Key and velocity zones
  • Sequencer built into app
  • Sample rate adjustment options
  • Persistent MIDI channel settings
  • Last preset memory on app launch

Kauldron Synthesizer

Reported bugs

15 issues
  • Oscillators cannot be set to -1 octave
  • Shrill noise
  • No Bluetooth speaker output
  • Fails to reload with Logic projects
  • Cannot load into Logic Pro
Show 10 more
  • Starts and quits on latest iOS
  • AUv3 bug: receives notes regardless of track selection
  • AUv3 implementation flaky, random crashes
  • AUv3: plays all instances simultaneously
  • Bug with Garageband: duplicates patterns
  • MIDI learn functions not saved
  • Sometimes glitchy
  • XY pad movements not recorded as automation
  • CPU killer on iPad 4
  • No function to share sounds

Requested features

11 requests
  • Bring synths/effects to macOS
  • Mac App version
  • More comprehensive FX section (distortion/saturation)
  • MIDI-out for arpeggiator
  • Drum machine, PAD launcher, DAW
Show 6 more
  • Browser download feature
  • Sequencer in Kauldron
  • Effects tool
  • Version history
  • More developer responses/support
  • Dark mode option

In-app purchases

None

iProphet Synthesizer

No in-app purchases

None

Kauldron Synthesizer

No in-app purchases

Questions

Is iProphet Synthesizer free?
iProphet Synthesizer costs $9.99, with no in-app purchases.
Is Kauldron Synthesizer free?
Kauldron Synthesizer costs $9.99, with no in-app purchases.
Which has better reviews, iProphet Synthesizer or Kauldron Synthesizer?
Kauldron Synthesizer is rated higher. iProphet Synthesizer averages 3.5 out of 5 from 31 ratings, while Kauldron Synthesizer averages 4.6 from 136 ratings.
Do iProphet Synthesizer or Kauldron Synthesizer have ads?
Neither iProphet Synthesizer nor Kauldron Synthesizer shows ads.
Which is updated more often, iProphet Synthesizer or Kauldron Synthesizer?
iProphet Synthesizer ships an update every 5 months, and Kauldron Synthesizer every 49 months. Most recently, iProphet Synthesizer was updated on October 24, 2026 and Kauldron Synthesizer on October 26, 2026.

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