Comparison

ChordTrans vs GSDSP Quantum Delay

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

Head to head
About

ChordTrans

Easily transpose chords and simplify difficult ones for guitar and E-piano players. This app offers tools to change song keys with or without a capo and find compatible keys for your music.

Highlights
  • Chord transposition
  • Simplify difficult chords
  • Capo simulation
  • Song key transposition
  • Key finder
  • E-piano transpose examples
Features
Read full description

Transpose chords, useful for guitar an E-Piano players This app contains the most useful and unique tools for guitar players. You can easily convert (transpose) chords. You can make difficult chords simpler. FEATURES: • Capo Using a capo to make difficult chords simpler without changing the song key. • Song transpose Transpose the song key (without using the capo). • Key transpose You can transpose the song key from its originate to another key without changing the chords (using only the capo). • Key finder Find the next compatible keys to your song chords. • Transpose by E-Piano Example for transpose +3 set capo in this App to 3 for transpose -5 set capo in this App to 12-5=7

About

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.

Highlights
  • 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)
Features
Read full description

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

ChordTrans4 screens
GSDSP Quantum Delay3 screens

Verdict

The call

The clearest difference is price: ChordTrans at $1.99 against GSDSP Quantum Delay's $14.99. ChordTrans also leads on update cadence (fortnightly vs every 5 weeks) and iOS requirement (9.0 vs 12.0). GSDSP Quantum Delay's advantage is rating (4.8 vs 4.3) and ratings volume (17 vs 4). On review sentiment, 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

ChordTrans costs $1.99 and GSDSP Quantum Delay $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

GSDSP Quantum Delay holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 4 and 17 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

ChordTrans ships an update fortnightly, GSDSP Quantum Delay every 5 weeks. Both last shipped on October 9, 2026.

Scorecard5 real differences · 5 level
ChordTrans versus GSDSP Quantum Delay: the parameters behind the verdict, then further details
ParameterChordTransGSDSP Quantum Delay
Price$1.99 — better$14.99
Rating4.3 (4 ratings)4.8 (17 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings417 — better
Update frequencyFortnightly — betterEvery 5 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better12.0
Further details — not scored
Size17 MB94 MB
Age rating4+4+
DeveloperKamran SaberihaghighiGustav Scholda

Customer experience

ChordTrans

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

GSDSP Quantum Delay

All ratings17 ratings
Positive94.1%
Neutral0.0%
Negative5.9%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

ChordTrans

No in-app purchases

None

GSDSP Quantum Delay

No in-app purchases

Questions

Is ChordTrans free?
ChordTrans costs $1.99, with no in-app purchases.
Is GSDSP Quantum Delay free?
GSDSP Quantum Delay costs $14.99, with no in-app purchases.
Which has better reviews, ChordTrans or GSDSP Quantum Delay?
GSDSP Quantum Delay is rated higher. ChordTrans averages 4.3 out of 5 from 4 ratings, while GSDSP Quantum Delay averages 4.8 from 17 ratings.
Do ChordTrans or GSDSP Quantum Delay have ads?
Neither ChordTrans nor GSDSP Quantum Delay shows ads.
Which is updated more often, ChordTrans or GSDSP Quantum Delay?
ChordTrans ships an update fortnightly, and GSDSP Quantum Delay every 5 weeks. Most recently, ChordTrans was updated on October 9, 2026 and GSDSP Quantum Delay on October 9, 2026.

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