Comparison

NuRack Auv3 FX Processor vs TB Flowtones

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

TB Flowtones

This virtual analog synthesizer app offers a true VA synthesis engine with analog-modeled filters and extensive modulation options. Create warm, analog-sounding music with a powerful architecture, diverse waveforms, and pro-grade effects. It also includes an integrated step sequencer and hundreds of presets.

Highlights
  • True virtual analog synthesis engine
  • Analog-modelled non-linear filters
  • Extensive modulation options
  • Pro-grade studio effects
  • Integrated step sequencer
  • Hundreds of presets and intelligent randomizer
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TB Flowtones Virtual Analog Synthesizer app and AUv3 plug-in Thanks to it's true VA synthesis engine, the use of analog-modelled non-linear filters and extensive modulation options, Flowtones sounds warmer and more analog than digital romplers and wavetable-based synths. TB Flowtones comes as stand-alone app as well as AUv3 plugin. True virtual analog synthesis features: - 4 VCO architecture (two voice layers with two VCOs each) - 4 synthesis engine types, in part modelled after famous analog synthesisers - 36 analog VCO waveforms featuring all classic waveforms and more - All VCO waveforms support pulse width modulation - Full stereo and mono unison modes for each VCO independently - Noise and subharmonic oscillators for each VCO - Unique ring and self-modulation matrix - High-quality, warm, non-linear filters (VCF) with over 30 filter types, including unique multi-resonance filters Modulation features: - Four LFOs with 30 waveforms each - LFOs can modulate other LFOs, including themselves! - Three additional envelope generators, with key velocity modulation - Quick access to modulation strengths through context menus - Hundreds of modulation signal paths available - LFOs can produce noise as waveform to randomly modulate other parameters; for example to simulate slight variations in analog filter parameters as they happen in analog circuits. Pro-grade effects - Studio-quality reverb, delay, and chorus effects - Unique formant filter to add vocal character - Analog and digital distortion / bit crushing effects - Master equaliser and peak limiter for final touch - Non-linear power supply simulation for authentic interaction between notes Step sequencer - Fully integrated, intuitive step sequencer - Can trigger chords and note series / phrases - Can run asynchronously or synchronously to the host - Smart copy/paste of note series to improve workflow - Smart zoom: edit fine details while keeping an overview over the full sequence Presets and intelligent randomizer - Flowtones comes with hundreds of presets to spark your creativity - Intelligent randomizer to explore endless sound synthesis possibilities What you should know: - Licenses acquired for this platform are not compatible with other platforms. - Audio Unit (AUv3) extensions require an iPad mini 2, iPad 4 or later models.

Screenshots

NuRack Auv3 FX Processor4 screens
TB Flowtones4 screens

Verdict

The call

The clearest difference is update cadence: NuRack Auv3 FX Processor at every 3 weeks against TB Flowtones's every 3 months. NuRack Auv3 FX Processor also leads on chart position (#197 vs unranked) and price ($7.99 vs $9.99). On rating, review sentiment, ratings volume and ads 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

NuRack Auv3 FX Processor costs $7.99 and TB Flowtones $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for NuRack Auv3 FX Processor against 4.7 for TB Flowtones. Both are backed by a comparable volume of ratings — 42 and 39 respectively. Written reviews are what separate them: 84% of NuRack Auv3 FX Processor's written reviews are positive against 83% of TB Flowtones's.

UpkeepUpdate frequency

NuRack Auv3 FX Processor ships an update every 3 weeks, TB Flowtones every 3 months. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

Scorecard3 real differences · 8 level
NuRack Auv3 FX Processor versus TB Flowtones: the parameters behind the verdict, then further details
ParameterNuRack Auv3 FX ProcessorTB Flowtones
Price$7.99 — better$9.99
Rating4.7 (42 ratings)4.7 (39 ratings)
Positive reviews84.4% of reviews — better82.9% of reviews
Number of ratings42 — better39
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#197 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1313.0
Further details — not scored
Size26 MB17 MB
Age rating4+4+
Developer4Pockets.comToneBoosters

Customer experience

NuRack Auv3 FX Processor

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

TB Flowtones

All ratings39 ratings
Positive89.7%
Neutral7.7%
Negative2.6%
Written reviews35 reviews
Positive82.9%
Neutral11.4%
Negative5.7%

In-app purchases

None

NuRack Auv3 FX Processor

No in-app purchases

None

TB Flowtones

No in-app purchases

Questions

Is NuRack Auv3 FX Processor free?
NuRack Auv3 FX Processor costs $7.99, with no in-app purchases.
Is TB Flowtones free?
TB Flowtones costs $9.99, with no in-app purchases.
Which has better reviews, NuRack Auv3 FX Processor or TB Flowtones?
NuRack Auv3 FX Processor and TB Flowtones are both rated 4.7 out of 5 on the App Store, from 42 and 39 ratings respectively.
Do NuRack Auv3 FX Processor or TB Flowtones have ads?
Neither NuRack Auv3 FX Processor nor TB Flowtones shows ads.
Which is updated more often, NuRack Auv3 FX Processor or TB Flowtones?
NuRack Auv3 FX Processor ships an update every 3 weeks, and TB Flowtones every 3 months. Most recently, NuRack Auv3 FX Processor was updated on October 15, 2026 and TB Flowtones on October 8, 2026.

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