Flowtones

Name: Flowtones
Price: 39.74 USD
Author: ToneBoosters

by ToneBoosters · Synth · Virtual analog synth

Not rated yet

Flowtones is a two-part virtual analog synthesizer from ToneBoosters with analog-modeled oscillators, 36 waveforms and over 30 filter types.

It includes a modulation matrix, step sequencer, effects and a smart randomizer, for $39.74 (€35).

Best for: Keys & Synths, Bass, Sound Design. Genres: Electronic & EDM, Pop, Ambient & Cinematic.

Keywords: analog, analog-sounding, sequencer, AUv3/iOS, randomize, virtual analog, basses, modern, undo/redo, vintage, A/B compare, classic, leads, modulation matrix, pads, resizable UI, sound design, subtractive, surgical.

What it does

Flowtones is ToneBoosters' virtual analog synth. It layers two parts, each with two analog-modelled VCOs, and lets you choose between vintage and modern circuit behaviour for the oscillators.

Two parts, four oscillators: two synth parts, each with two analog-modelled VCOs, for layered or split sounds.
VCO modes and waveforms: four VCO synthesis modes that simulate modern or vintage circuitry, and 36 waveform types covering the classic shapes and more.
Filters: more than 30 analog-modelled filter types.
Modulation: envelopes, LFOs, ring and self-modulation, and hundreds of modulation paths reaching the VCOs, filters and effects.
Step sequencer: build and trigger sequences inside the synth.
Effects: EQ, reverb, echo, a formant filter, chorus and a master limiter.
Presets and workflow: hundreds of categorized presets, an intelligent randomizer, undo/redo, A/B switching, a resizable UI with dozens of colour themes, and sample rates up to 384 kHz.

The current version is 2.1.8 (July 2026).

Source: ToneBoosters product page

When to use it

Flowtones is a low-cost, general-purpose VA with a step sequencer, randomizer and good built-in effects, rather than a recreation of one classic instrument. Compared with u-he Diva it costs a fraction of the price, but it does not aim at Diva's component-level vintage modelling. Unlike Arturia's CS-80 V it is not tied to one synth's layout or sound. Next to Sylenth1 it adds a formant filter, a sequencer and more filter types for less money. Its tabbed, app-like interface splits users, so try it before buying.

Best for: basses, pads, leads and sequenced patterns with an analog flavour, and sharing patches between desktop and iOS.
Genres: electronic, pop and ambient.
Look elsewhere if: you want wavetable or granular synthesis (Serum 2, Vital) or a faithful clone of a vintage synth (Arturia's V Collection instruments).
Tip: a KVR user notes the desktop and iOS versions can swap patches, so you can sketch sounds on an iPad and finish them in the DAW.

What producers say

Users like the sound, formant filter and effects; the interface is the main point of disagreement.

KVR users rate it 4 out of 5 from 3 reviews (2021–2022). One called it "really, really great sounding", praising the bass and formant filter; an iOS user found the effects "top notch".
Criticisms: a Mac user (version 1, 2021) gave it 3 out of 5, finding the app-like interface "horrible to navigate"; another reviewer said the UI improved a lot by version 1.0.3.

KVR user reviews

Where to buy

ToneBoosters: $39.74 (Listed at €35; converted at €1 = $1.1355 (ECB rate, 29 Sep 2026))

Tutorials and reviews

Similar plugins

Retrologue 2 by Steinberg · Virtual analog synth · $83.73
Element 2.0 Virtual Analog Synth by Waves · Virtual analog synth · $34.99
Unique by Sugar Bytes · Virtual analog synth · $99
Discovery Pro by discoDSP · Virtual analog synth · $139.30
BLEASS Alpha by BLEASS · Virtual analog polysynth · $69
Olga by Stillwell Audio · Virtual analog synth · $79
Sylenth1 by LennarDigital · Virtual analog · $157.83
Go2-X by Rob Papen · Virtual analog synth · $42.31
Synth1 by Daichi Laboratory · Virtual analog synth · Free
Lush 2 by D16 Group · Multilayer virtual analog synth · $158.99

All synths