Comparison

Zeeon synth 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

Zeeon synth

This app is a virtual analog synthesizer that recreates the sound and feel of classic hardware. It features a detailed circuit-modeling engine, powerful modulation, and multiple filter models for rich, organic soundscapes. Explore a vast array of presets and expand your sonic palette with additional sound banks.

Highlights
  • Circuit-modeling engine
  • Powerful modulation matrix
  • Dual oscillators with variable waveforms
  • Multiple filter models
  • Built-in effects unit
  • Audio Unit v3 support
  • Polyphonic step sequencer
Features
Read full description

Zeeon is a virtual-analog synthesizer built on a deeply detailed circuit-modeling engine. We’ve studied classic and modern analog synths to uncover what gives them their unmistakable character and recreated that essence with precision. The result is a unique instrument that delivers the warmth, movement, and organic depth of true hardware. While many emulations sound flat, Zeeon breathes. Every note is alive, with tight lows and shimmering highs. All audio and modulation are processed at 176 kHz (4× oversampling) for uncompromised quality across the entire spectrum. “Desktop-class sound engine … fidelity of this analog emulation goes beyond everything else on iOS.” – App Store review Features • Audio Unit v3 and standalone application with a simple polyphonic step sequencer • Powerful modulation matrix offering self-modulation and cross-layer modulation, 8 modulation slots, 17 signal sources and 41 targets available, both from modulation modules and audio signal path. This takes Zeeon into semi-modular territory. Imagine oscillator waveform, panning, filter cutoff, resonance or LP-HP mode modulated by oscillators or another layer! • 2 oscillators with continuously variable waveforms, hard-sync and sub-oscillator. Carefully simulated analog drift and PSU influence. • Filter: 3 models available: Transistor ladder low pass, OTA cascade low pass and State Variable Filter with continuously variable LP-HP + BP mode. • 2 low frequency oscillators and envelope generators per voice. • Overdrive: diode clipper, transistor saturation, wave folder, pre and post filter. • Up to 2 layers per voice. Layers can modulate each other. • Effects unit: Circuit modelled BBD chorus, bass booster, zero-delay Phaser, Stereo delay and Reverb. • 280 presets and Tutorials bank. 3 additional banks available as IAPs. Full manual and audio demos available at the BeepStreet website.

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
Read full description

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

Zeeon synth3 screens
TB Flowtones4 screens

Verdict

The call

The clearest difference is in-app purchases: TB Flowtones at none against Zeeon synth's 3. TB Flowtones also leads on price ($9.99 vs $14.99) and iOS requirement (13.0 vs 15.6). Zeeon synth's advantage is ratings volume (209 vs 39). On rating, review sentiment, update cadence 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

Zeeon synth costs $14.99 and TB Flowtones $9.99 up front. Zeeon synth sells 3 one-off in-app purchases. TB Flowtones asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Zeeon synth against 4.7 for TB Flowtones. That said, the two scores are not equally well evidenced: Zeeon synth has 209 ratings behind it against 39, so its average is the more settled of the two. Written reviews are what separate them: 76% of Zeeon synth's written reviews are positive against 83% of TB Flowtones's.

UpkeepUpdate frequency

Zeeon synth ships an update every 2 months, TB Flowtones every 3 months. The most recent releases landed on September 18, 2026 and September 22, 2026 respectively.

Scorecard5 real differences · 5 level
Zeeon synth versus TB Flowtones: the parameters behind the verdict, then further details
ParameterZeeon synthTB Flowtones
Price$14.99$9.99 — better
Rating4.8 (209 ratings) — better4.7 (39 ratings)
Positive reviews75.9% of reviews82.9% of reviews — better
Number of ratings209 — better39
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size27 MB17 MB
Age rating4+4+
DeveloperBeepStreetToneBoosters

Customer experience

Zeeon synth

All ratings209 ratings
Positive93.8%
Neutral2.4%
Negative3.8%
Written reviews166 reviews
Positive75.9%
Neutral7.2%
Negative16.9%

TB Flowtones

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

Bugs and requests

Zeeon synth

Reported bugs

4 issues
  • Preset settings not retained after app restart
  • Synth reverts to default settings when reopening Logic Pro project
  • Crashes and freezes on certain iOS 14+ devices
  • Inability to access in-app purchases from within the app

Requested features

5 requests
  • Add MIDI learn functionality
  • Implement a more robust preset management system
  • Include a built-in sequencer with save/load capabilities
  • Improve UI scaling and layout for larger iPad screens
  • Provide better integration with inter-app audio and Audiobus

TB Flowtones

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Zeeon synth

One-time3
  • OI - Exploration Vol. 1$3.99
  • BB Z-Space$4.99
  • BB Synthwave$4.99
None

TB Flowtones

No in-app purchases

Questions

Is Zeeon synth free?
Zeeon synth costs $14.99, and also offers in-app purchases.
Is TB Flowtones free?
TB Flowtones costs $9.99, with no in-app purchases.
Which has better reviews, Zeeon synth or TB Flowtones?
Zeeon synth is rated higher. Zeeon synth averages 4.8 out of 5 from 209 ratings, while TB Flowtones averages 4.7 from 39 ratings.
Do Zeeon synth or TB Flowtones have ads?
Neither Zeeon synth nor TB Flowtones shows ads.
Which is updated more often, Zeeon synth or TB Flowtones?
Zeeon synth ships an update every 2 months, and TB Flowtones every 3 months. Most recently, Zeeon synth was updated on September 18, 2026 and TB Flowtones on September 22, 2026.

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