Frekvens is a frequency shifter and delay effect. Unlike a pitch shifter all frequencies are shifted linearly and then fed back into itself using the stereo delay unit. The frequency shifting is achieved with single sideband modulation using a hilbert transform and an infinite impulse response filter for fast computations. Frekvens also comes with a high and low pass filter and a lfo for modulating the delay play head.

- frequency shifter
- high, low pass filter
- stereo delay
- core midi cc input
- audiobus
- inter app audio
- audio unit extension
- save, load

What’s New

Version 1.3.12

+++ Updating audio engine to improve IAA compatibility with iOS 12.4 and up.

Ratings and Reviews

4.6 out of 5
10 Ratings

10 Ratings

Tenente ,

Inexpensive but not cheap

Put off getting this dev’s apps because they were inexpensive & expected them to cheap quality.
Don’t waste time like I did. Get this app, or all of his apps. Read the reviews and trust the experiences.
FREAK & NILS are 2 mandatory iOS audio production apps, regardless of genre of style; there is more use for what these do then what is described by the dev or what you should reasonably expect.
It’s apps like these, priced to keep you creating competitively, that help the iOS platform offer equitable opportunities for everyone to have the tools to produce great music without worrying about your budget.

Mo Freeapps ,

Party over here...

Ahh..freqvens - probably my favorite iOS effector. This thing can do so much to your sound or you can real it back and it will give your audio a nice little sizzle or warble that, every one’s saying just pleases the ear. I’m not going to tell you no collusion because if you offer some extreme parameters to this device STAND BACK or moreover SIT DOWN because if you close your eyes it sounds like an imperial probe is sexting with the black knight and WHAT THE HELL WOULD THEY BE SAYING TO EACH OTHER ?? Buy this app and find out.

anickt ,

I have the bundle!

The controls are somewhat cryptic but once you know what they do (as the on-screen hints indicate) you will find these are very cool apps.

App Privacy

The developer, Erik Sigth, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


erik sigth
5.9 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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