Comparison

FAC Chorus vs StringLab

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

FAC Chorus

This app delivers an authentic, lush, and organic chorus effect with analog-style circuitry. It offers versatile modulation, from subtle doubling to rich swirling sounds, and can function as a chorus, flanger, or vibrato. Expanded controls and feedback options provide deep sonic shaping for professional music production.

Highlights
  • Authentic analog-style bucket brigade circuitry
  • Subtle doubling to rich swirling modulation
  • Chorus, Flanger, or Vibrato modes
  • Expanded controls with multiple characters
  • Feedback control for flanger-like textures
  • AUv3 plugin for iOS, macOS, and Vision Pro
Features
Read full description

• Authentic, lush, and organic chorus effect • True analog-style bucket brigade circuitry • A modern reissue of the most iconic hardware units • Ranges from subtle doubling to rich, swirling modulation • Versatile usage: Chorus, Flanger, or Vibrato • Expanded controls with multiple characters and waveforms • Feedback control for rich, flanger-like textures • A favorite chorus in the iOS music community • Advanced Responsive Design, portrait and landscape views • Universal Purchase: AUv3 for iOS (iPad/iPhone), macOS and Vision Pro FAC Chorus brings depth and movement to your sounds with an authentic, lush, and organic character. Built with true analog-style bucket brigade circuitry, this plugin is a modern reissue of some of the most iconic hardware units, faithfully capturing their distinctive tone. The effect ranges from subtle doubling to rich, swirling modulation, covering different uses as a Chorus, Flanger, or Vibrato. The expanded modulation controls, multiple characters, and LFO waveforms allow precise shaping of your sound, giving you complete creative flexibility. In addition, the feedback control adds rich, flanger-like textures for dynamic sonic effects. Under the hood, the plugin uses two individual delay line paths. Each path’s behavior is determined by the character parameter: Thick and BBD provide warm, classic BBD-style tones, while Clean delivers a more transparent tone with greater modulation. This chorus has become a favorite in the iOS music community, combining vintage inspiration with modern control to deliver professional-quality sound in any production. This is an AUv3 Effect and requires a compatible host to work The in-app purchases are for tipping only, the app is fully functional without them The documentation is available at fredantoncorvest.com/FAC_Chorus.html

About

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.

Highlights
  • 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
Read full description

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

FAC Chorus2 screens
StringLab4 screens

Verdict

The call

The clearest difference is review sentiment: FAC Chorus at 95% against StringLab's 57%. FAC Chorus also leads on price ($6.99 vs $14.99) and rating (4.8 vs 4.3). StringLab's advantage is in-app purchases (none vs 3) and update cadence (every 10 days vs every 5 months). On 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

CostPrice · In-app purchases · Ads · Monetization

FAC Chorus costs $6.99 and StringLab $14.99 up front. FAC Chorus sells 3 one-off in-app purchases. StringLab asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

FAC Chorus holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 61 and 14 respectively. Written reviews point the same way: 95% of FAC Chorus's written reviews are positive against 57% of StringLab's.

UpkeepUpdate frequency

FAC Chorus ships an update every 5 months, StringLab every 10 days. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

Scorecard8 real differences · 2 level
FAC Chorus versus StringLab: the parameters behind the verdict, then further details
ParameterFAC ChorusStringLab
Price$6.99 — better$14.99
Rating4.8 (61 ratings) — better4.3 (14 ratings)
Positive reviews95.0% of reviews — better57.1% of reviews
Number of ratings61 — better14
Update frequencyEvery 5 monthsEvery 10 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS16.413.0 — better
Further details — not scored
Size4 MB45 MB
Age rating4+4+
DeveloperFrederic Corvest4Pockets.com

Customer experience

FAC Chorus

All ratings61 ratings
Positive96.7%
Neutral0.0%
Negative3.3%
Written reviews40 reviews
Positive95.0%
Neutral2.5%
Negative2.5%

StringLab

All ratings14 ratings
Positive78.6%
Neutral7.1%
Negative14.3%
Written reviews7 reviews
Positive57.1%
Neutral14.3%
Negative28.6%

In-app purchases

3 purchases

FAC Chorus

One-time3
  • Small Tip$1.99
  • Medium Tip$4.99
  • Large Tip$14.99
None

StringLab

No in-app purchases

Questions

Is FAC Chorus free?
FAC Chorus costs $6.99, and also offers in-app purchases.
Is StringLab free?
StringLab costs $14.99, with no in-app purchases.
Which has better reviews, FAC Chorus or StringLab?
FAC Chorus is rated higher. FAC Chorus averages 4.8 out of 5 from 61 ratings, while StringLab averages 4.3 from 14 ratings.
Do FAC Chorus or StringLab have ads?
Neither FAC Chorus nor StringLab shows ads.
Which is updated more often, FAC Chorus or StringLab?
FAC Chorus ships an update every 5 months, and StringLab every 10 days. Most recently, FAC Chorus was updated on September 22, 2026 and StringLab on September 21, 2026.

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