Comparison

DirectionalEQ vs Sirens' Chor

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

Head to head
About

DirectionalEQ

This audio plugin allows independent equalization of different directions within the stereo field. It offers five bands with advanced filter types, enabling precise adjustments to specific audio directions for a more nuanced sound. Designed for use within compatible music production host apps.

Highlights
  • Independent equalization of stereo field directions
  • Five bands with state-of-the-art filter types
  • 64-bit processing and 2x oversampling
  • Specify direction for each band's operation
  • Works as an Audio Unit or Inter App Audio plugin
Features
Read full description

Traditional EQs influence the spectrum of the whole stereo field simultaneously. L/R or Mid-Side-EQs allow you to treat the two channels or the mid and the side signal simultaneously. DirectionalEQ takes this concept one big step further: now you can equalize all directions in the stereo field independently! With five bands, each of them providing state-of-the-art filter types (including 64 bit processing and 2x oversampling) plus the unique ability to specify the direction in which the channel is operational. So you need more bass at 2 o’clock, less midrange at 11 o’clock and a bit more treble from the left? No problem at all, that’s exactly what this EQ has been made for! This app is intended to work as an Audio Unit or Inter App Audio plugin within a compatible host app like Garageband, Cubasis or Auria.

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

Screenshots

DirectionalEQ2 screens
Sirens' Chor3 screens

Verdict

The call

The clearest difference is review sentiment: Sirens' Chor at 100% against DirectionalEQ's 33%. Sirens' Chor also leads on price ($3.99 vs $9.99) and rating (4.0 vs 3.6). DirectionalEQ's advantage is ratings volume (14 vs 2) and update cadence (every 19 months vs every 39 months). On ads, in-app purchases, monetization model 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

DirectionalEQ costs $9.99 and Sirens' Chor $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Sirens' Chor holds the better App Store score, 4.0 against 3.6. That said, the two scores are not equally well evidenced: DirectionalEQ has 14 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 33% of DirectionalEQ's written reviews are positive against 100% of Sirens' Chor's.

UpkeepUpdate frequency

DirectionalEQ ships an update every 19 months, Sirens' Chor every 39 months. Both last shipped on October 24, 2026.

Scorecard5 real differences · 5 level
DirectionalEQ versus Sirens' Chor: the parameters behind the verdict, then further details
ParameterDirectionalEQSirens' Chor
Price$9.99$3.99 — better
Rating3.6 (14 ratings)4.0 (2 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings14 — better2
Update frequencyEvery 19 months — betterEvery 39 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.3 — better10.0
Further details — not scored
Size11 MB11 MB
Age rating4+4+
DeveloperChristian SiedschlagAleksandar Mlazev

Customer experience

DirectionalEQ

All ratings14 ratings
Positive57.1%
Neutral14.3%
Negative28.6%
Written reviews6 reviews
Positive33.3%
Neutral16.7%
Negative50.0%

Sirens' Chor

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

In-app purchases

None

DirectionalEQ

No in-app purchases

None

Sirens' Chor

No in-app purchases

Questions

Is DirectionalEQ free?
DirectionalEQ costs $9.99, with no in-app purchases.
Is Sirens' Chor free?
Sirens' Chor costs $3.99, with no in-app purchases.
Which has better reviews, DirectionalEQ or Sirens' Chor?
Sirens' Chor is rated higher. DirectionalEQ averages 3.6 out of 5 from 14 ratings, while Sirens' Chor averages 4.0 from 2 ratings.
Do DirectionalEQ or Sirens' Chor have ads?
Neither DirectionalEQ nor Sirens' Chor shows ads.
Which is updated more often, DirectionalEQ or Sirens' Chor?
DirectionalEQ ships an update every 19 months, and Sirens' Chor every 39 months. Most recently, DirectionalEQ was updated on October 24, 2026 and Sirens' Chor on October 24, 2026.

Other comparisons