Comparison

Alina String Ensemble 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

Alina String Ensemble

This app is a musical keyboard simulator that recreates the authentic sounds of the Solina String Ensemble from the 1970s. It features a 49-key, 4-octave keyboard with multiple instrument sounds and built-in effects like reverb and modulation.

Highlights
  • Solina String Ensemble sound simulation
  • 6 pre-loaded instruments
  • 49-key, 4-octave keyboard
  • Core MIDI and MIDI compatible
  • Built-in spring reverb effect
  • Adjustable modulation
Features
Currently charting
Read full description

Alina String Ensemble is a musical keyboard application for iPhone/iPad/iPod touch that simulates the Solina String Ensemble. The sound is in reference to Solina String Ensemble (Serial number "SERIES 22, No.0093158”) manufactured by N.V. EMINENT BODEGRAVEN HOLLAND in the 70’s. You are sure to be surprised at the real sound generated from this App. Features: - Pre-loaded with 6 instruments including Viola, Violin, Brass, Horn, Cello, Contra Bass - 49key, 4-octave Keyboards with scrollable - Core MIDI and MIDI compatible - Scrollable Keyboard & dual Keyboards(Only iPad) - BASS tone(Cello, Contra Bass) is assigned on lowest 20 keys - Built-in Reverb that simulates a spring reverb - Modulation that can adjust the rate and depth Special thanks: Jun Kawabata courtesy of AIRPLANE LABEL & Studio Peach Blue Peach

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

Alina String Ensemble4 screens
Kauldron Synthesizer4 screens

Verdict

The call

The clearest difference is rating: Kauldron Synthesizer at 4.6 against Alina String Ensemble's 4.2. Kauldron Synthesizer also leads on review sentiment (80% vs 52%) and ratings volume (136 vs 20). Alina String Ensemble's advantage is update cadence (every 4 months vs every 49 months) and price ($3.99 vs $9.99). On ads, in-app purchases, monetization model and device support 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

Alina String Ensemble costs $3.99 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 4.2. That said, the two scores are not equally well evidenced: Kauldron Synthesizer has 136 ratings behind it against 20, so its average is the more settled of the two. Written reviews point the same way: 52% of Alina String Ensemble's written reviews are positive against 80% of Kauldron Synthesizer's.

UpkeepUpdate frequency

Alina String Ensemble ships an update every 4 months, Kauldron Synthesizer every 49 months. The most recent releases landed on October 15, 2026 and October 20, 2026 respectively.

Scorecard6 real differences · 5 level
Alina String Ensemble versus Kauldron Synthesizer: the parameters behind the verdict, then further details
ParameterAlina String EnsembleKauldron Synthesizer
Price$3.99 — better$9.99
Rating4.2 (20 ratings)4.6 (136 ratings) — better
Positive reviews52.4% of reviews79.7% of reviews — better
Number of ratings20136 — better
Update frequencyEvery 4 months — betterEvery 49 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#130 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better15.6
Further details — not scored
Size131 MB32 MB
Age rating4+4+
Developerinsideout ltd.Yonac Inc.

Customer experience

Alina String Ensemble

All ratings20 ratings
Positive75.0%
Neutral5.0%
Negative20.0%
Written reviews21 reviews
Positive52.4%
Neutral0.0%
Negative47.6%

Kauldron Synthesizer

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

Bugs and requests

Alina String Ensemble

Not enough reviews yet to summarise bugs or requests.

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

Alina String Ensemble

No in-app purchases

None

Kauldron Synthesizer

No in-app purchases

Questions

Is Alina String Ensemble free?
Alina String Ensemble costs $3.99, with no in-app purchases.
Is Kauldron Synthesizer free?
Kauldron Synthesizer costs $9.99, with no in-app purchases.
Which has better reviews, Alina String Ensemble or Kauldron Synthesizer?
Kauldron Synthesizer is rated higher. Alina String Ensemble averages 4.2 out of 5 from 20 ratings, while Kauldron Synthesizer averages 4.6 from 136 ratings.
Do Alina String Ensemble or Kauldron Synthesizer have ads?
Neither Alina String Ensemble nor Kauldron Synthesizer shows ads.
Which is updated more often, Alina String Ensemble or Kauldron Synthesizer?
Alina String Ensemble ships an update every 4 months, and Kauldron Synthesizer every 49 months. Most recently, Alina String Ensemble was updated on October 15, 2026 and Kauldron Synthesizer on October 20, 2026.

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