Comparison

frekvens vs FrequencyCat

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

Head to head
About

frekvens

This app offers a unique frequency shifter and stereo delay effect. It utilizes single sideband modulation and an infinite impulse response filter for advanced audio manipulation. Additional features include high/low pass filters and an LFO for delay modulation.

Highlights
  • Frequency shifter
  • Stereo delay
  • High and low pass filter
  • LFO for delay modulation
  • Core MIDI CC input
  • Audiobus and Inter-App Audio support
  • Audio Unit extension
Features
Read full description

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

About

FrequencyCat

Transform your photos into unique sound art using advanced image-to-sound technology. Explore, enjoy, and share your creative audio-visual pieces. Embrace your inner artist and discover the unexpected.

Highlights
  • Morph images into sound art
  • Create spectrogram oddities
  • Share sound art creations
  • Unique audio-visual experience
Features
Read full description

Hide an image inside sound. FrequencyCat is a playful tool for exploring the connection between images, sound, and spectrograms. Choose an image, and FrequencyCat transforms it into a unique audio signal. Play the sound and view its spectrogram, and you’ll see the original image emerge again from the frequencies. With FrequencyCat, you can: - Turn images into sound - View audio spectrograms in real time - Play sounds and reveal the images hidden inside them - Explore how different images create different sounds - Discover the relationship between sound, frequency, and Fourier transforms in an intuitive way There’s no magic behind it. Just frequencies, phases, an inverse Fourier transform, and a little curiosity about sound. Whether you’re interested in acoustics, music, signal processing, or simply wondering what an image might sound like, FrequencyCat gives you a new way to explore. Pick an image. Hear what it sounds like.

Screenshots

frekvens4 screens
FrequencyCat3 screens

Verdict

The call

The clearest difference is price: FrequencyCat at Free against frekvens's $2.99. FrequencyCat also leads on review sentiment (100% vs 83%) and rating (5.0 vs 4.8). frekvens's advantage is update cadence (every 2 months vs every 40 months) and ratings volume (21 vs 1). On ads and in-app purchases 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

FrequencyCat is free to download; frekvens costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

FrequencyCat holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: frekvens has 21 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 83% of frekvens's written reviews are positive against 100% of FrequencyCat's.

UpkeepUpdate frequency

frekvens ships an update every 2 months, FrequencyCat every 40 months. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

Scorecard8 real differences · 2 level
frekvens versus FrequencyCat: the parameters behind the verdict, then further details
ParameterfrekvensFrequencyCat
Price$2.99Free — better
Rating4.8 (21 ratings)5.0 (1 ratings) — better
Positive reviews83.3% of reviews100.0% of reviews — better
Number of ratings21 — better1
Update frequencyEvery 2 months — betterEvery 40 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS11.0 — better16.0
Further details — not scored
Size3 MB3 MB
Age rating4+4+
DeveloperErik SigthXuesong Zhang

Customer experience

frekvens

All ratings21 ratings
Positive95.2%
Neutral0.0%
Negative4.8%
Written reviews18 reviews
Positive83.3%
Neutral5.6%
Negative11.1%

FrequencyCat

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

frekvens

No in-app purchases

None

FrequencyCat

No in-app purchases

Questions

Is frekvens free?
frekvens costs $2.99, with no in-app purchases.
Is FrequencyCat free?
FrequencyCat is free to download, with no in-app purchases.
Which has better reviews, frekvens or FrequencyCat?
FrequencyCat is rated higher. frekvens averages 4.8 out of 5 from 21 ratings, while FrequencyCat averages 5.0 from 1 ratings.
Do frekvens or FrequencyCat have ads?
Neither frekvens nor FrequencyCat shows ads.
Which is updated more often, frekvens or FrequencyCat?
frekvens ships an update every 2 months, and FrequencyCat every 40 months. Most recently, frekvens was updated on October 12, 2026 and FrequencyCat on October 6, 2026.

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