S vs P422 Fairuz
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
S
This semi-modular synthesizer app for iPad offers a hands-on sound design experience with a single-screen interface for intuitive patching. It delivers a warm, vintage sound inspired by 1970s synthesizers, featuring dual oscillators, resonant filters, and multiple modulation sources.
- Single-screen interface
- Fast, hands-on patching
- Vintage 1970s synth sound
- Dual oscillators
- Resonant ladder filter
- Multiple modulation sources
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S-Modular is a semi-modular synthesiser for iPad, designed for fast, hands-on patching without clutter. Everything is presented on a single screen, making sound design immediate and intuitive. Simply drag from one jack to another to create connections. S-Modular delivers a distinctive vintage sound inspired by classic 1970s synthesis — warm, rich, and full of character. Features Dual oscillators 24 dB/oct ladder filter Resonant high-pass and low-pass filters Two LFOs Four-step CV sequencer Four-track mixer Audio and CV splitter Two AHR envelope generators Delay effect
P422 Fairuz
This app offers a powerful four-band parametric equalizer with selectable curves and proportional Q for precise sound shaping. It emulates classic op-amp circuits, adding harmonic density and character, with features like a sub-bass circuit and input transformer control.
- Four op-amp EQ bands with Bell/Contour/Contour X2 shapes
- Proportional Q for musical width
- TREMOR sub-bass circuit
- VOICE input transformer and HAMMER output stage saturation
- Real-time spectrum analyzer
- AUv3 plugin and standalone app
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P422 Fairuz is a four-band op-amp parametric EQ that moves past hardware — the punch and harmonic density of classic op-amp circuits, with capabilities the originals never had. Shape your sound with HIGH, HI-MID, LO-MID and LOW bands, each with three selectable curves (Bell, Contour, Contour X2) and proportional Q: wide stays wide, narrow finds itself. LO and HI shelves with complementary dip behavior, switchable HPF/LPF, and the TREMOR circuit laying a sub-bass foundation below 30 Hz. Character comes from the circuit, not just the curve: OUT drives the op-amp output stage, VOICE adds drive on top of it, and HAMMER adds the output transformer after it, for body, density and saturation — op-amp color available even with the EQ bands off. Blend it all in parallel with the MIX control, no DAW routing needed. FEATURES - Four op-amp EQ bands with Bell / Contour / Contour X2 shapes - Proportional Q — musical at any width - Stepped or continuous frequency modes - LO / HI shelves with complementary dip - TREMOR sub-bass circuit below 30 Hz - Switchable HPF / LPF with position options - Op-amp output stage: OUT drive, VOICE drive and the HAMMER output transformer - MIX parallel blend and Dual Mono L/R behavior - Spectrum visualizer: drag the band dots, tap one for its card; IN/OUT analyzer with freeze, range, resolution, speed and tilt - A/B states and 276 factory presets with notes, tags, search and favorites - Out & Trim linked gain staging - Zero latency, optional oversampling FORMATS - AUv3 plug-in for AUM, Logic Pro, GarageBand, Cubasis and other AUv3 hosts - Standalone app with mic/interface input Bring console-grade op-amp tone to your iPad and iPhone.
Screenshots
Verdict
The clearest difference is review sentiment: P422 Fairuz at 100% against S's 31%. P422 Fairuz also leads on rating (5.0 vs 2.6) and update cadence (monthly vs every 7 months). S's advantage is price ($2.99 vs $19.99) and ratings volume (11 vs 1). 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
S costs $2.99 and P422 Fairuz $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
P422 Fairuz holds the better App Store score, 5.0 against 2.6. That said, the two scores are not equally well evidenced: S has 11 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 31% of S's written reviews are positive against 100% of P422 Fairuz's.
S ships an update every 7 months, P422 Fairuz monthly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | S | P422 Fairuz |
|---|---|---|
| Price | $2.99 — better | $19.99 |
| Rating | 2.6 (11 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 31.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 11 — better | 1 |
| Update frequency | Every 7 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | Paul Betowski | Pulsar Modular |
Customer experience
S
P422 Fairuz
In-app purchases
S
No in-app purchases
P422 Fairuz
No in-app purchases









