Agonizer vs TB Flowtones
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Agonizer
This app is a monophonic synthesizer focused on bass sounds, developed with a synth bass expert. It features dual wavetable oscillators, a mangle section, and built-in stereo effects. It supports MPE controllers and various audio/MIDI connectivity options for standalone or app-to-app use.
- Monophonic synth engine for bass
- Dual wavetable oscillators
- Built-in stereo effects
- MPE controller support
- Standalone and AUv3 operation
- 140+ factory presets
Read full descriptionHide full description
Agonizer is a monophonic synthesizer designed in collaboration with YouTuber and synth bass expert Jakob Haq of haQ attaQ Overview: * Monophonic Synth Engine with focus on Bass * Built-in stereo effects * 140+ fine tuned factory presets designed by Jakob Haq * Supports ROLI Seaboard and other MPE controllers out of the box * Standalone operation with support for USB audio interfaces, wired, network & bluetooth MIDI * Audio Unit v3 Extension * Inter App Audio support * Audiobus support * Ableton Link Synth Voice: * Dual Wavetable Oscillators with 40+ Wavetables, Morphing & X-Mod * Dedicated sub osc & noise source * Mangle Section with pre-filter Drive, Bitcrush, Lift and Push controls * VA Ladder filter * Wobulator (Highly tweak-able Sequenced LFO) * LFO with Key and BPM Sync * Variable Slope AD & ADSR Envelopes * Tube based master drive Effects: * 2x stereo effect units * Vintage Chorus * Digital Delay Presets: * Factory bank including 140+ presets designed by Jakob Haq * Preset Management with Templates & Categories * Shared User Presets between Standalone and AUv3 versions * Preset Export & Import Connectivity: * Standalone * AUv3 Instrument * Inter-App Audio Instrument * Audiobus Instrument Requirements: * iOS12+ * iPad Air 2 or newer
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.
- 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 descriptionHide 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
Verdict
The clearest difference is price: TB Flowtones at $9.99 against Agonizer's $19.99. TB Flowtones also leads on in-app purchases (none vs 3). Agonizer's advantage is ratings volume (203 vs 39) and iOS requirement (11.0 vs 13.0). 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
Agonizer costs $19.99 and TB Flowtones $9.99 up front. Agonizer sells 3 one-off in-app purchases. TB Flowtones asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.8 for Agonizer against 4.7 for TB Flowtones. That said, the two scores are not equally well evidenced: Agonizer has 203 ratings behind it against 39, so its average is the more settled of the two. Written reviews are what separate them: 78% of Agonizer's written reviews are positive against 83% of TB Flowtones's.
Agonizer ships an update every 5 months, TB Flowtones every 3 months. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.
| Parameter | Agonizer | TB Flowtones |
|---|---|---|
| Price | $19.99 | $9.99 — better |
| Rating | 4.8 (203 ratings) — better | 4.7 (39 ratings) |
| Positive reviews | 77.8% of reviews | 82.9% of reviews — better |
| Number of ratings | 203 — better | 39 |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 362 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | ToneBoosters |
Customer experience
Agonizer
TB Flowtones
Bugs and requests
Agonizer
Reported bugs
16 issues- Keyboard does not properly handle legato/mono-synth note priority
- Crashes in Audiobus, AUM, and Cubasis host applications
- No sound output when used as AUv3 plugin in hosts
- No sound in GarageBand integration
- App freezes on splash screen with iOS 18.3
Show 11 moreShow fewer
- Stuck notes and failed note triggering
- Scream button malfunction when switching presets
- Cutoff knob lag in AUv3 scenarios
- UI jitter and text cutoff on iPhone
- Favorite preset feature not working on iPhone
- Program change not working properly in hosts
- Always opens with init preset in host applications
- Modulation matrix sensitivity too high (2% movement = large range)
- Audio output peaks in red with no sound
- Permanent clipping/damaged audio output
- Misleading IAP pricing display (showing 'FREE' for paid content)
Requested features
10 requests- Polyphony mode or toggle between mono and poly
- Envelope drawing capability instead of preset selection
- Menu-based waveform selection instead of cycling
- Arpeggiator function
- Preset browser search and favorites filter
Show 5 moreShow fewer
- Extended automation control for all knobs
- Keytracking for filter
- Reverb effect
- Accelerometer/gyroscopic velocity sensitivity
- Customizable number of keyboard keys
TB Flowtones
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Agonizer
- Chrome Oasis Pack$3.99
- Circuit Bender Pack$3.99
- Neon Nightmare Pack$4.99
TB Flowtones
No in-app purchases








