S vs Delay Line
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
Delay Line
This audio effect app offers a high-quality digital delay with smooth parameter control for musical echoes. It's designed to add depth and space to your sound without unwanted noise.
- High-quality digital delay
- Smooth parameter interpolation
- Feedback control
- Musical echoes
- Linear interpolation for delay time
- Comprehensive parameter smoothing
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A high-quality digital delay effect with smooth parameter interpolation and feedback control. This delay provides clean, musical echoes perfect for adding depth and space to your audio. The delay uses linear interpolation for smooth delay time changes and includes comprehensive parameter smoothing to eliminate zipper noise during real-time parameter adjustments.
Screenshots
Verdict
The clearest difference is rating: Delay Line at 5.0 against S's 2.6. Delay Line also leads on price ($1.99 vs $2.99). S's advantage is ratings volume (11 vs 2) and iOS requirement (15.6 vs 17.0). 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 Delay Line $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Delay Line 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 2, so its average is the more settled of the two.
| Parameter | S | Delay Line |
|---|---|---|
| Price | $2.99 | $1.99 — better |
| Rating | 2.6 (11 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 31.3% of reviews | — |
| Number of ratings | 11 — better | 2 |
| Update frequency | Every 7 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 7 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Paul Betowski | Callback Audio, LLC |
Customer experience
S
Delay Line
In-app purchases
S
No in-app purchases
Delay Line
No in-app purchases
