Comparison

NuRack Auv3 FX Processor vs FrequencyCat

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

Head to head
About

NuRack Auv3 FX Processor

Design custom audio and MIDI effects racks with over 80 building blocks. Route audio in series or parallel and create unique interfaces for your sound processing needs.

Highlights
  • Design custom effects racks
  • Over 80 audio and MIDI building blocks
  • Full routing control (series/parallel)
  • Customizable interface builder
  • Seamless effect switching
  • 3 independent audio racks mode
  • Extensive automation options
Currently charting
Read full description

NuRack is an AUv3 based multi-channel audio and MIDI effects processor with a difference, it actually allows you to design your own custom effects using the 80+ building blocks provided. You have full control over routing which allows you to create complex audio paths in series or parallel. You can choose whether to use the stock interface or create your own custom interface using the built in Interface Builder which allows you to concentrate your audio components into a single customized effect. NuRack can run in one of two modes. The first providing 3 customizable effects racks which can be switched (manually or via MIDI), providing seemless switching (i.e. delay trails linger whilst another set of effects are faded in). The second mode allows you to route audio through 3 independent audio racks. A generaous number of over 80 audio and midi building blocks are provided covering 12 different categories of effects. Here are just some of those included in NuRack: Modulation Effects: Chorus, Flanger, Phaser, Tremolo, Vocal Doubler, TalkBox, UniVibe, Leslie & Vocoder. Time Based Effects: Stereo Delay, Tape Delay, Reverb and Reverse Delay. Spectral Effects: Parametric EQ, Graphic EQ, PitchShift, Auto-Pan, Bit-Crusher, Tube Overdrive, Distortion, Harmony, Harmonic Exciter and SlowMo. Dynamic Effects: VelocityControl, Compressor, Multi-Band Compressor, Noise Gate, Gate, and Limiter. Filter Effects: MultiFilter, LP/HP Filter, Frequency Splitter, MultiBand Splitter, Classic Filters, Formant Filter, Ring Modulation and Shelf Filter. MIDI Effects: MIDI Harmony, MIDI Velocity, MIDI Randomizer, MIDI Monitor, MIDI Mixer, MIDI Pads, MIDI Control, Strummer, MIDI Recorder, MIDI Modulation, MIDI Remap, CC Monitor, CC Generator, PitchBend, MIDI Time Clock, and ChordToMidi. Generator Modules: Noise, Audio Clip Launcher, SoundFont Player, Virtual Flute, Virtual Clarinet, Virtual Brass, FM Organ, FM Rhodes and Analog Sawtooth Synth. Automation: TouchPad, AutoMate, Pattern Automation, and Visual LFO. You also provide the ability to split and combine audio signal using splitters and mixer modules as well as a number of visual elements such as VU Meters, LED Meters, Scopes, Graphs etc. Some effects such as phaser and flanger are usually controlled by an LFO, but this can be detached and automated remotely. There are a number of modules that allow auomation based on direct touch (X/Y Pads), Visual LFO, Pattern Automation, MIDI input (CC data), or peak/rms level detection. These automation modules can remotely control knobs and sliders throughout your rack. Simply create a new rack and start adding modules to it. These modules are generally wired up automatically but these connections can be manually routed. Once you have your sound as you wish you can use it 'as is', or switch to Interface Builder mode where you can combine all your modules into a single interface. Elements can be dragged, dropped, resized and coloured as required. Add your own labels, image logos and custom backgrounds before saving your custom component. Use the X/Y Pad to control your modulation effects by detaching their LFO's. Use MIDI CC data to automate knobs. Use the velocity of an incoming signal to control the cutoff/resonance of a filter (wah) or volume level of a gain control (swell), as NuRack expands, so do the possibilities. Features: ○ Over 80 categorised modules. ○ 3 Input / Output busses supported. ○ Audio & MIDI effect. ○ Lots of audio & MIDI automation options. ○ Seemless transition between racks. ○ Manual audio path routing. ○ Open in presentation mode (auto hides controls). ○ Interface Builder to customize your rack. ○ AUv3 plugin runs in MIDI and none MIDI mode. ○ Add your own Text/Heading and Image/Logos and backgrounds to your design. ○ Compatibility options for DAW's not supporting multi-channels. ○ Dark/Light Modes Checkout the YouTube channel 'Paul the MusicMan' for demos and tutorials of NuRack.

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

NuRack Auv3 FX Processor4 screens
FrequencyCat3 screens

Verdict

The call

The clearest difference is price: FrequencyCat at Free against NuRack Auv3 FX Processor's $12.99. FrequencyCat also leads on rating (5.0 vs 4.7) and review sentiment (100% vs 84%). NuRack Auv3 FX Processor's advantage is update cadence (every 3 weeks vs every 40 months) and ratings volume (42 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; NuRack Auv3 FX Processor costs $12.99 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 4.7. That said, the two scores are not equally well evidenced: NuRack Auv3 FX Processor has 42 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 84% of NuRack Auv3 FX Processor's written reviews are positive against 100% of FrequencyCat's.

UpkeepUpdate frequency

NuRack Auv3 FX Processor ships an update every 3 weeks, FrequencyCat every 40 months. The most recent releases landed on September 25, 2026 and September 4, 2026 respectively.

Scorecard9 real differences · 2 level
NuRack Auv3 FX Processor versus FrequencyCat: the parameters behind the verdict, then further details
ParameterNuRack Auv3 FX ProcessorFrequencyCat
Price$12.99Free — better
Rating4.7 (42 ratings)5.0 (1 ratings) — better
Positive reviews84.4% of reviews100.0% of reviews — better
Number of ratings42 — better1
Update frequencyEvery 3 weeks — betterEvery 40 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#182 — better—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13 — better16.0
Further details — not scored
Size26 MB3 MB
Age rating4+4+
Developer4Pockets.comXuesong Zhang

Customer experience

NuRack Auv3 FX Processor

All ratings42 ratings
Positive92.9%
Neutral2.4%
Negative4.8%
Written reviews32 reviews
Positive84.4%
Neutral6.3%
Negative9.4%

FrequencyCat

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

In-app purchases

None

NuRack Auv3 FX Processor

No in-app purchases

None

FrequencyCat

No in-app purchases

Questions

Is NuRack Auv3 FX Processor free?
NuRack Auv3 FX Processor costs $12.99, with no in-app purchases.
Is FrequencyCat free?
FrequencyCat is free to download, with no in-app purchases.
Which has better reviews, NuRack Auv3 FX Processor or FrequencyCat?
FrequencyCat is rated higher. NuRack Auv3 FX Processor averages 4.7 out of 5 from 42 ratings, while FrequencyCat averages 5.0 from 1 ratings.
Do NuRack Auv3 FX Processor or FrequencyCat have ads?
Neither NuRack Auv3 FX Processor nor FrequencyCat shows ads.
Which is updated more often, NuRack Auv3 FX Processor or FrequencyCat?
NuRack Auv3 FX Processor ships an update every 3 weeks, and FrequencyCat every 40 months. Most recently, NuRack Auv3 FX Processor was updated on September 25, 2026 and FrequencyCat on September 4, 2026.

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