Comparison

Sirens' Chor vs Sound

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

Head to head
About

Sirens' Chor

This experimental audio effect app analyzes input audio to generate a secondary harmonic voice using sine wave oscillators. The generated voice can be mixed with the original or played solo, creating a chorus effect. It's CPU intensive and operates within a specific frequency range.

Highlights
  • Harmonic analysis of input audio
  • Sine wave oscillator synthesis
  • Adjustable chorus effect
  • Second voice generation
  • AUV3 plugin support
Features
Read full description

This one is quite experimental and CPU heavy app! While working on my Chord Detector app I came up with the idea to play the found harmonics with sine wave oscillators so I can hear what the algorithm is hearing :) It turns out to be an interesting output that led me to creation of this audio effect app. What happens here is that the input is analysed for main harmonics in the range of 80Hz to 1500Hz. Then a series of sine wave oscillators are set to play those harmonics with the exact frequency and volume and their output is added to create a second voice. This second voice can then be mixed with the input to create some kind of chorus or played alone. All this is CPU heavy process so it should be used with care... Also to make this effect possible I had to use limited range 80Hz to 1500Hz so it is not suitable for every instrument and you have to keep that range in mind when producing. Some very fast volume and frequency changes are applied to the oscillators. The app is AUV3

About

Sound

This application helps you block out distracting noises using basic wired headphones. It's designed to improve focus and productivity without requiring expensive equipment.

Highlights
  • Noise cancellation
  • Works with wired headphones
  • Improves focus
  • Affordable solution
Features
Read full description

Sound-Shield – Smarter Sound Control, Completely Free Take control of your audio like never before with Sound-Shield — the ultimate app designed to give you a cleaner, safer, and more personalized listening experience. Whether you're trying to block out distractions, protect your hearing, or just fine-tune your sound, Sound-Shield has you covered. Key Features: • Real-time sound filtering and control • Reduce unwanted or harsh audio instantly • Clean, simple interface built for speed and ease • Lightweight and optimized for performance Why Sound-Shield? Sound-Shield isn’t just another audio app — it’s your personal sound protection system. Whether you're gaming, studying, working, or just relaxing, you stay in control of what you hear. 100% Free No subscriptions. No hidden fees. Just download and use. Built for Everyone From casual users to power users, Sound-Shield is designed to enhance your experience without getting in your way. Download Sound-Shield today and experience sound your way.

Screenshots

Sirens' Chor3 screens
Sound3 screens

Verdict

The call

The clearest difference is price: Sound at Free against Sirens' Chor's $3.99. Sound also leads on rating (5.0 vs 4.0) and update cadence (every 2 months vs every 39 months). Sirens' Chor's advantage is iOS requirement (10.0 vs 15.1). On ratings volume, ads, in-app purchases 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

Sound is free to download; Sirens' Chor costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Sound holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

UpkeepUpdate frequency

Sirens' Chor ships an update every 39 months, Sound every 2 months. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
Sirens' Chor versus Sound: the parameters behind the verdict, then further details
ParameterSirens' ChorSound
Price$3.99Free — better
Rating4.0 (2 ratings)5.0 (4 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings24 — better
Update frequencyEvery 39 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS10.0 — better15.1
Further details — not scored
Size11 MB43 MB
Age rating4+4+
DeveloperAleksandar MlazevThomas Soter

Customer experience

Sirens' Chor

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Sound

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sirens' Chor

No in-app purchases

None

Sound

No in-app purchases

Questions

Is Sirens' Chor free?
Sirens' Chor costs $3.99, with no in-app purchases.
Is Sound free?
Sound is free to download, with no in-app purchases.
Which has better reviews, Sirens' Chor or Sound?
Sound is rated higher. Sirens' Chor averages 4.0 out of 5 from 2 ratings, while Sound averages 5.0 from 4 ratings.
Do Sirens' Chor or Sound have ads?
Neither Sirens' Chor nor Sound shows ads.
Which is updated more often, Sirens' Chor or Sound?
Sirens' Chor ships an update every 39 months, and Sound every 2 months. Most recently, Sirens' Chor was updated on October 24, 2026 and Sound on October 31, 2026.

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