Zeeon synth vs Lagrange
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zeeon synth
This app is a virtual analog synthesizer that recreates the sound and feel of classic hardware. It features a detailed circuit-modeling engine, powerful modulation, and multiple filter models for rich, organic soundscapes. Explore a vast array of presets and expand your sonic palette with additional sound banks.
- Circuit-modeling engine
- Powerful modulation matrix
- Dual oscillators with variable waveforms
- Multiple filter models
- Built-in effects unit
- Audio Unit v3 support
- Polyphonic step sequencer
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Zeeon is a virtual-analog synthesizer built on a deeply detailed circuit-modeling engine. We’ve studied classic and modern analog synths to uncover what gives them their unmistakable character and recreated that essence with precision. The result is a unique instrument that delivers the warmth, movement, and organic depth of true hardware. While many emulations sound flat, Zeeon breathes. Every note is alive, with tight lows and shimmering highs. All audio and modulation are processed at 176 kHz (4× oversampling) for uncompromised quality across the entire spectrum. “Desktop-class sound engine … fidelity of this analog emulation goes beyond everything else on iOS.” – App Store review Features • Audio Unit v3 and standalone application with a simple polyphonic step sequencer • Powerful modulation matrix offering self-modulation and cross-layer modulation, 8 modulation slots, 17 signal sources and 41 targets available, both from modulation modules and audio signal path. This takes Zeeon into semi-modular territory. Imagine oscillator waveform, panning, filter cutoff, resonance or LP-HP mode modulated by oscillators or another layer! • 2 oscillators with continuously variable waveforms, hard-sync and sub-oscillator. Carefully simulated analog drift and PSU influence. • Filter: 3 models available: Transistor ladder low pass, OTA cascade low pass and State Variable Filter with continuously variable LP-HP + BP mode. • 2 low frequency oscillators and envelope generators per voice. • Overdrive: diode clipper, transistor saturation, wave folder, pre and post filter. • Up to 2 layers per voice. Layers can modulate each other. • Effects unit: Circuit modelled BBD chorus, bass booster, zero-delay Phaser, Stereo delay and Reverb. • 280 presets and Tutorials bank. 3 additional banks available as IAPs. Full manual and audio demos available at the BeepStreet website.
Lagrange
This app is a hybrid synthesizer that simplifies sound creation by using oscillator algorithms to manage complex parameters. It focuses on quickly achieving desired sounds by selecting the appropriate oscillator type.
- AUv3-compatible synthesizer
- Simplified sound creation
- Oscillator algorithms
- Quick sound selection
- Hybrid synthesis
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Lagrange is an AUv3-compatible synthesizer designed to simplify sound creation by concealing complex parameter adjustments within oscillator algorithms. Rather than emphasizing precise sound design, this synthesizer prioritizes selecting the right oscillator type to quickly achieve the sound that suits your needs. For more detailed information about the product, please visit the website. The website offers detailed product descriptions, manuals and videos, as well as important notices. https://icegear.net/
Screenshots
Verdict
The clearest difference is in-app purchases: Lagrange at none against Zeeon synth's 3. Lagrange also leads on price ($8.00 vs $14.99) and review sentiment (95% vs 76%). Zeeon synth's advantage is ratings volume (209 vs 57). On rating, ads 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
Zeeon synth costs $14.99 and Lagrange $8.00 up front. Zeeon synth sells 3 one-off in-app purchases. Lagrange asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.8 for Zeeon synth against 4.8 for Lagrange. Both are backed by a comparable volume of ratings — 209 and 57 respectively. Written reviews are what separate them: 76% of Zeeon synth's written reviews are positive against 95% of Lagrange's.
Zeeon synth ships an update every 2 months, Lagrange every 2 weeks. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.
| Parameter | Zeeon synth | Lagrange |
|---|---|---|
| Price | $14.99 | $8.00 — better |
| Rating | 4.8 (209 ratings) | 4.8 (57 ratings) — better |
| Positive reviews | 76.0% of reviews | 95.5% of reviews — better |
| Number of ratings | 209 — better | 57 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 27 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | BeepStreet | iceWorks, Inc. |
Customer experience
Zeeon synth
Lagrange
Bugs and requests
Zeeon synth
Reported bugs
4 issues- Preset settings not retained after app restart
- Synth reverts to default settings when reopening Logic Pro project
- Crashes and freezes on certain iOS 14+ devices
- Inability to access in-app purchases from within the app
Requested features
5 requests- Add MIDI learn functionality
- Implement a more robust preset management system
- Include a built-in sequencer with save/load capabilities
- Improve UI scaling and layout for larger iPad screens
- Provide better integration with inter-app audio and Audiobus
Lagrange
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Zeeon synth
- OI - Exploration Vol. 1$3.99
- BB Z-Space$4.99
- BB Synthwave$4.99
Lagrange
No in-app purchases








