# StringLab — Digital String Modeling

> Physical string modeling synthesizer for creating diverse instrument sounds. (iPhone/iPad app by 4Pockets.com.)

- Source: https://appshunter.io/ios/app/stringlab/id6461312318 (this page in markdown: same URL + `.md`)
- Developer: [4Pockets.com](https://appshunter.io/developer/370131860)
- Category: Music
- Price: $8.99 (on sale, was $14.99)
- Rating: 4.30/5 from 14 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 45 MB
- Languages: American English
- Released: 2023-09-20
- Data updated: 2026-09-09
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/stringlab/id6461312318/reviews.md

## What is StringLab?

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.

## Key features

- 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

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/stringlab/id6461312318/reviews.md

### 5/5 — Love this Karplus app.

*2026-02-01*

Does more than just string sounds.
Great presets, and lots of tools for making your own patches.
Shines in AUV, as well as standalone.
Glad I got this one :-)

### 5/5 — Incredible Sounds from a Small App

*2025-02-26*

Most apps that provide these types of sounds use samples and tend to be very large (hundreds of MB). This app models the instruments providing much more flexibility and a very small size. I still have to try it with an MPE keyboard.

### 1/5 — I got on sound

*2024-08-25*

I downloaded the app and got no sound. I trying different settings but nothing came out. Looked the the user manual and got nothing.

### 1/5 — Being Honest

*2023-11-05*

There’s no sound to this on this plugin

### 4/5 — MPE and normal Midi support a bit incomplete…

*2023-10-10*

I do get very nice sounds out of this synth, also the models are fine. But a synth, be it anlog or modeled or digital can only live up to its potential if I can control it with my controller. Not only the MPE implementation, also a dumb keyboard has more to deliver than an on switch. 
I would expect that the damping of my model is changing when I release a key. That doesn’t happen. It is like the sustain is always on. Why limit modulation to cc1 and cc2 and remap aftertouch and cc74 to those? And they don’t seem to be per voice either. They also can only modulate a single parameter…
The articulation selection could be a menu to set multiple controller sources: cc74, aftertouch, Release velocity, and more…
If all this would be implemented I would happily give the full 5 star rating… Though it is incomplete I will give it not 3 but 4 stars for its nice sound and general idea. Look at is as an expression of trust…
And as extra wish, let it be opened in MacOS as well, that would be great…

### 5/5 — Top App

*2023-09-27*

Great sound, really cuts through the mix. Would love to see an ARP on this thing.

### 3/5 — Great app but it needs CC mapping

*2023-09-22*

Really nice app but I am surprised you don’t have any provision to map CC controls with it. I play a windsynth controller and this is a must need for the synths I use. I am aware I can probably map parameters in AUM and use Loopback to get the audio into Logic but that introduces more latency. Hope you can add CC mapping to this app and Copperhead (also a great synth)

**Developer response:** Unlike typical synths based on additive synthesis, this app uses Karplus Strong which is based on delay lines and feedback loops. This can soon get out of control I give external access to some controls so I have imposed limits in the initial release. I am introducing some CC control into the next version of the app, but only those parameters that are safe to do so.

## Frequently asked questions about StringLab

### What is StringLab?

StringLab is a digital synthesizer that uses Karplus-Strong theory for physical string modeling. It's designed to reproduce the sounds of various instruments, especially those with hammered or plucked strings, and allows for the creation of unique sonic textures.

### What kind of instruments can StringLab simulate?

StringLab excels at simulating hammered or plucked string instruments. However, its physical modeling capabilities allow for experimentation to create a wide range of new and original instrument sounds beyond traditional instruments.

### Does StringLab have ads?

No, StringLab does not contain advertisements. It is a premium application purchased upfront.

### What devices does StringLab support?

StringLab is compatible with iPhone, iPad, and iPod devices, offering a versatile platform for music creation on iOS.

### How often is StringLab updated?

The latest version of StringLab is 1.08, and it was last updated on December 2, 2025. This indicates a recent update, suggesting ongoing development and support.

### What is the age rating for StringLab?

StringLab has an age rating of 4+, making it suitable for a wide range of users interested in music and sound synthesis.

### How does StringLab compare to other synthesizers?

StringLab focuses on physical string modeling, offering a unique approach to sound generation compared to subtractive or additive synthesizers. Its strength lies in its ability to mimic acoustic properties and create novel instrument sounds.

### What is the price of StringLab?

StringLab is available for purchase at $14.99, offering a one-time cost for access to its full feature set.

## Version history (last 5 releases)

### 1.08 — 2025-12-02

v1.08 B43
Fix for UI issue on some devices using iOS26.1.

### 1.07 — 2025-11-20

v1.07 B42
Fixed toolbar and menu content issue misalignment in iOS26.1 (due to bug in iOS 26.1 was fiine in 26.0)

### 1.06 — 2025-08-26

v1.06 B41
Added scene support to support future iOS Versions.

### 1.0.5 — 2024-01-11

Added an MPE keyboard option for standalone mode.

### 1.04 — 2023-10-09

v1.04 B38
•Added a new background mode option in Settings.
•Fixed a spelling of Articulation title.
•Updated manual with video links.
•Fixed a couple of spelling mistakes in the help manual.

v1.03
•Added channel aftertouch support.
•Added simple MPE controls such as per note pitch bend, aftertouch and mapping of CC74.
•You can now configure CC1 (mod) and CC2 (breath control) seperately. To configure CC1/CC2 tap the 2 dots in the upper corner of the articulation title.
•Aftertouch and CC74 can be mapped to either CC1 or CC2 internally.
•Added addition Reverb Mix, Delay Mix and Aftertouch options to the mod wheel menu.
•Updated manual

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All apps by 4Pockets.com: https://appshunter.io/developer/370131860

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-09.*