Comparison

StringLab vs ab Phaser X

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

Head to head
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.

About

ab Phaser X

This music app offers a versatile phase modulator with 2 to 12 stages. Customize sweeps with controls for rate, depth, frequency, and feedback. Adjust loudness and blend for your final sound.

Highlights
  • 2 to 12 stage phase modulation
  • Rate control (DAW sync or 0.001Hz-10Hz)
  • Depth, Frequency, and Feedback controls
  • Gain and Mix controls for loudness and blend
Features
Read full description

'ab Phaser X' is a phase modulator featuring from 2 to 12 stages. With 'ab Phaser X' you can control the rate of your phase, whether it's synced to your DAW's BPM or freely from 0,001Hz all the way to 10Hz. Depth, Frequency and Feedback controls help you customise your phase sweeps further and finally, a Gain and Mix control will allow you to control the loudness and the blend of the final Phaser.

Screenshots

StringLab4 screens
ab Phaser X1 screens

Verdict

The call

The clearest difference is rating: ab Phaser X at 5.0 against StringLab's 4.3. ab Phaser X also leads on price ($5.99 vs $14.99). StringLab's advantage is update cadence (every 10 days vs every 11 months). On ratings volume, ads, in-app purchases and monetization model 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

StringLab costs $14.99 and ab Phaser X $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

ab Phaser X holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 14 and 5 respectively.

UpkeepUpdate frequency

StringLab ships an update every 10 days, ab Phaser X every 11 months. The most recent releases landed on September 25, 2026 and September 8, 2026 respectively.

Scorecard3 real differences · 7 level
StringLab versus ab Phaser X: the parameters behind the verdict, then further details
ParameterStringLabab Phaser X
Price$14.99$5.99 — better
Rating4.3 (14 ratings)5.0 (5 ratings) — better
Positive reviews57.1% of reviews—
Number of ratings14 — better5
Update frequencyEvery 10 days — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size45 MB8 MB
Age rating4+4+
Developer4Pockets.comAlejandro Cabrera Zuniga

Customer experience

StringLab

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

ab Phaser X

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

StringLab

No in-app purchases

None

ab Phaser X

No in-app purchases

Questions

Is StringLab free?
StringLab costs $14.99, with no in-app purchases.
Is ab Phaser X free?
ab Phaser X costs $5.99, with no in-app purchases.
Which has better reviews, StringLab or ab Phaser X?
ab Phaser X is rated higher. StringLab averages 4.3 out of 5 from 14 ratings, while ab Phaser X averages 5.0 from 5 ratings.
Do StringLab or ab Phaser X have ads?
Neither StringLab nor ab Phaser X shows ads.
Which is updated more often, StringLab or ab Phaser X?
StringLab ships an update every 10 days, and ab Phaser X every 11 months. Most recently, StringLab was updated on September 25, 2026 and ab Phaser X on September 8, 2026.

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