Blip Box vs GSDSP Quantum Delay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Blip Box
A powerful sixteen-voice drum synthesizer offering a unique digital sound engine inspired by analog and digital synths. It features a touch-friendly interface, complex audio modulation, and versatile effects for creating distinctive electronic music.
- Sixteen-voice drum synthesizer
- Complex audio rate modulation
- Touch-first control interface
- Standalone and AUv3 plugin support
- Universal purchase for Apple platforms
- MIDI controller compatibility
- Pure synthesis engine, no samples
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Blip Box is a sixteen voice drum synthesizer that may look nice but can sound mean. Blip Box takes inspiration from a variety of synths, both analog and digital. We pulled together all the things we love about drum synthesis: complex audio rate modulation, snappy envelopes, harsh effects; and put them together in a compact, touch-friendly package. The result is a truly unique digital sound engine that has taken on a life of its own. Whatever you do, don’t have fun with it! Features: - Focused, fun, and characterful synth engine - Touch-first design, almost the entire screen is part of a control - Runs standalone or as AUv3 plug-in (in compatible host) - Universal purchase on Apple platforms: runs on iPhone, iPad, and Mac - Presets synced across your devices via iCloud - Hook up a MIDI controller to play with a keyboard (optional) Details: - Pure synthesis engine, no samples - Complex digital oscillator with two-way frequency modulation - White noise source - Two snappy AD envelopes with variable shape - Unique mix control for pure oscillator sound or ring mod mayhem - “Choose-your-own-adventure” effect: analog (ish) wavefolder or digital degradation - State variable filter for tone shaping - Envelopes can be routed to modulate oscillator shape, pitch, or filter cutoff - Mix to filter cutoff modulation available for crispy filter FM - Velocity responsive, either in traditional level (gain) mode or brightness mode - Multi-out mode available when running in AUv3 mode - Master tune for keeping tonal drum sounds in tune with your song - Includes 13 inventive and usable factory kits to get you started making music Check out our YouTube: https://www.youtube.com/@sketchaudio Read the manuals: https://sketchaudio.com/manuals/
GSDSP Quantum Delay
This app offers a vintage-inspired stereo delay effect with advanced modulation, flexible filtering, and precise timing controls. It allows users to sculpt unique echo textures, from warm analog sounds to complex, evolving soundscapes.
- Vintage-inspired stereo delay
- Deep modulation system
- Flexible filtering (LPF, HPF, BPF)
- Precise timing controls (BPM, ms)
- Switchable stereo/dual mono modes
- Advanced modulation sources (LFO, Random, Envelope)
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A vintage-inspired delay supercharged with deep modulation, flexible filtering, and creative timing that pushes echoes into new dimensions. Classic Delay, Reinvented Quantum Delay takes the charm of a vintage stereo delay and fuses it with our next-level modulation system. Switch between the warm character of Tape mode and the pristine clarity of Fade mode, lock to BPM (including 5-tuplets) or dial in precise times in milliseconds. Use the Fine control for subtle push-and-pull micro-timing — or modulate your delay lines in ways traditional delays could only dream of. Sculpted Echoes Shape your repeats with switchable lowpass, highpass, and bandpass filters placed directly in the feedback path. Add modulation to create evolving tones, gentle movement, or drifting, frequency-shifting echoes. From warm analog-style rolls to shimmering, swirling textures, it’s all there. Feedback with Precision Control your delay tail behavior using either traditional % feedback or our modern dB-per-second decay system — ideal for predictable, musical decay even when the feedback path becomes complex. Enable Crossfeed for classic ping-pong stereo bounce, or push into Over-Feedback to create dense, self-building echoes that drift toward infinity. Stereo or Dual Mono Every section of Quantum Delay — delay, filter, and feedback — can switch between stereo and dual mono modes. Create tight, controlled stereo images or break them apart for wide, offset, unpredictable spaces. Dual mono modulation unlocks complex stereo interplay and beautifully asymmetric echoes. Modulation Without Limits Quantum Delay integrates our advanced modulation system, letting you modulate nearly anything: delay time, filters, feedback parameters, stereo controls, and more. Use LFOs, Random Generators, 2D modulators, Envelope Followers, Macros, and even chaotic systems to push your echoes far beyond traditional delay behavior. Or use our parameter randomisation feature to explore the plugin’s sound at random. Quantum Delay is an AUv3 audio effect plugin compatible with Logic Pro, AUM, Cubasis, GarageBand and many more. A Desktop version is also available for Windows and macOS (VST3 / AU / AAX). More information here: https://gs-dsp.com/products
Screenshots
Verdict
The clearest difference is price: Blip Box at $5.99 against GSDSP Quantum Delay's $14.99. Blip Box also leads on update cadence (weekly vs every 5 weeks). GSDSP Quantum Delay's advantage is review sentiment (100% vs 90%) and iOS requirement (12.0 vs 15.0). On rating, ratings volume, ads and in-app purchases 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
Blip Box costs $5.99 and GSDSP Quantum Delay $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.8 for Blip Box against 4.8 for GSDSP Quantum Delay. Both are backed by a comparable volume of ratings — 20 and 17 respectively. Written reviews are what separate them: 90% of Blip Box's written reviews are positive against 100% of GSDSP Quantum Delay's.
Blip Box ships an update weekly, GSDSP Quantum Delay every 5 weeks. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.
| Parameter | Blip Box | GSDSP Quantum Delay |
|---|---|---|
| Price | $5.99 — better | $14.99 |
| Rating | 4.8 (20 ratings) | 4.8 (17 ratings) |
| Positive reviews | 90.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 20 — better | 17 |
| Update frequency | Weekly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | Sketch Audio, LLC | Gustav Scholda |
Customer experience
Blip Box
GSDSP Quantum Delay
In-app purchases
Blip Box
No in-app purchases
GSDSP Quantum Delay
No in-app purchases








