Spiral Chorus vs StringLab
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spiral Chorus
This music effect plugin offers an analog-modeled LCR chorus with touch-friendly controls and immersive 3D visuals. It seamlessly integrates into DAWs for iOS, adding depth and texture to various music productions.
- Analog Modeled LCR Chorus
- Touch-Friendly Controls
- Immersive 3D Visuals
- Versatile Music Application
- Optimized for iOS
- Seamless DAW Integration
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FX Forms #001 - Spiral Chorus from Wild Surmise Music, number one in the series of AUv3 FX plugins. Key Features: - Analog Modeled LCR Chorus: Delve into the rich, warm textures of an analog-modeled LCR (Left-Center-Right) chorus effect, bringing a new dimension to your tracks. - Touch-Friendly Controls: With an interface tailored for iOS, Spiral Chorus offers intuitive, touch-friendly controls. Effortlessly sculpt your sound with responsive sliders and xy pads, ensuring a seamless workflow. - Immersive 3D Visuals: Enhance your audio manipulation experience with captivating 3D visuals in the background. - Versatile Application: Whether you're working on dreamy soundscapes, dynamic beats, or cutting-edge experimental sounds, Spiral Chorus adds a layer of depth and texture to your music. - Optimized for iOS: Crafted specifically for the iOS environment, Spiral Chorus ensures a stable, high-performance experience on your favorite devices. 3D Visuals leverage SceneKit and Metal Shaders providing good visual performance on iOS devices. - Seamless Integration: Use Spiral Chorus seamlessly within your favorite DAW as an AUv3 plugin, fitting perfectly into your existing workflow.
StringLab
This app is a digital synthesizer that uses physical string modeling to recreate the sounds of various instruments, particularly plucked or hammered strings. It allows users to explore acoustic physics and create unique instrument textures through extensive parameter experimentation.
- Karplus-Strong physical modeling
- Exciter Impact and Noise modes
- Resonator objects with feedback
- Frequency Dispersion support
- External live input
- Preset randomizer and manager
- Drag & Drop preset export
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StringLab is a physical string modeling synthesizer based on Karplus-Strong theory. It is capable of reproducing the sounds of many different types of instruments, but is especially useful in the reproduction of hammered or plucked strings and other types of percussive instruments. It works by passing carefully crafted waveforms and short bursts of white noise through a series of tuned delay lines. The delay lines have an internal feedback loop with a series of filters to mimic the natural decay of harmonics found in a real instrument. StringLab allows you to discover the character of real-world accoustics, exploring the physics of how materials interact. Many new and original textures are born out of experimenting with the settings, so don't be afraid to experiment and create your own unique and dynamic instruments. Features •Karplus Strong based physical modeling. •Exciter Impact with multiple modes. •Exciter Noise with many envelope driven filters. •2 resonator objects with feedback. •8 bands per object with inversion. •4 Coupling modes. •Supports Frequency Dispersion. •Feedback low/high Damping. •Per object Body Filter. •Pitch Deformity. •External live input mode. •Preset randomiser. •Build it Preset Manager & Favourites. •Search Presets. •Drag & Drop preset export of presets. •Supports Color Sets.
Screenshots
Verdict
The clearest difference is price: Spiral Chorus at Free against StringLab's $14.99. Spiral Chorus also leads on rating (5.0 vs 4.3) and review sentiment (89% vs 57%). StringLab's advantage is in-app purchases (none vs 3) and update cadence (every 10 days vs every 15 months). On ratings volume, 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
Spiral Chorus is free to download; StringLab costs $14.99 up front. Spiral Chorus sells 3 one-off in-app purchases. StringLab asks for nothing beyond the download.
Spiral Chorus holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 15 and 14 respectively. Written reviews point the same way: 89% of Spiral Chorus's written reviews are positive against 57% of StringLab's.
Spiral Chorus ships an update every 15 months, StringLab every 10 days. The most recent releases landed on September 10, 2026 and September 21, 2026 respectively.
| Parameter | Spiral Chorus | StringLab |
|---|---|---|
| Price | Free — better | $14.99 |
| Rating | 5.0 (15 ratings) — better | 4.3 (14 ratings) |
| Positive reviews | 88.9% of reviews — better | 57.1% of reviews |
| Number of ratings | 15 — better | 14 |
| Update frequency | Every 15 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 12 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Tom Power | 4Pockets.com |
Customer experience
Spiral Chorus
StringLab
In-app purchases
Spiral Chorus
- Small Tip$1.99
- Medium Tip$4.99
- Large Tip$9.99
StringLab
No in-app purchases







