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 Fathom Synth by Seaweed Audio is a Virtual Instrument Audio Plugin for macOS and Windows. It functions as a VST Plugin and an Audio Units Plugin.
Fathom Synth

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Computer Music Magazine

"This leviathan of a synth offers up an infinitely deep sonic playground that puts many a paid-for plugin to shame."

"Fully modulator and flexible, Fathom has enough features to leave even seasoned synthesists gasping for air. Despite its bottomless potential, Fathom is really easy to 'fathom' with a sleek and intuitive interface that gives immediate and impressive results." (CM June 2019 Page 65).

Fathom Version 2.33.0

Latest Features

Fathom Synth Website


Supported Plugin Formats

Windows VST 32/64, Mac AU/VST 64.


Modular Signal Flow, 16x16 Wave Table Morphing, Free Hand Wave Draw, Bezier Curve Oscillator, Single Cycle WAV Import Export, 5 Alias Free Oscillators, 30 Filters, 8 Effects, Bezier and Exponential Envelope Curves, Unlimited Modulations, 7 Types of Modulators, Real-time Host Automation, Resizable GUI, Free Mono Version, Direct Email Tech Support, Windows and Mac compatible.

Fathom Reviews

BPB Top 50 Free VST Plugins of 2017 (Fathom #3)

Bedroom Producers Blog Fathom Review

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Fathom Synth

Fathom is a new modular software synthesizer specializing in original waveform development, complex modulations and advanced wave table processing.

Wave Table Morphing Oscillator

Two morphing tables of 16 waveforms each with modulating wave indexes for real-time wave scanning.

The ability to modulate and morph between two tables creating a 3D wave space.

Waveforms in the second table can be added or subtracted from the first.

Algorithms include morph, add and subtract, unipolar, bipolar, chop.

Animated graphs show the operand waveform, operator waveform and combination waveform in real-time.

Each waveform can be loaded or hand-drawn using the wave draw interface.

Waveforms can be auto-filled for perfectly smooth transitions between edited wave positions.

Individual waveforms can be saved and loaded, and entire wave tables can be saved and loaded.


Fully modular signal flow.

The ability to draw your own waveforms.

7 types of oscillators.

Bezier Curve and Wave Draw Oscillators.

All oscillators include:

  • AM and FM synthesis.
  • Frequency ranged noise generator with built in filter.
  • Harmonic and random distortion section.
  • Detune section with nonlinear modulations and built in chorus.

32 types of filters.

8 effects: mixer, two chorus, three reverb, phaser, 3 channel digital delay with built-in filters and multiple sends.

Modulators: LFO, LFO Draw, ADSR, Multisegment Envelope, Sequencer, Random Sample and Hold, Keyboard Tracking and MIDI control, with up to 64 segments per envelope.

Modulation matrix: unlimited modulations per dial, unlimited dials per modulation.

Exponential and Bezier envelope curves.

The ability to export your own waveforms to WAV format (pro version only).

Host automation of virtually every control on the instrument.

Over 500 factory presets and 200 waveforms.

KVR Marketplace Purchasing Instructions

Latest User Reviews Average user rating of 4.65 from 20 reviews

Reviewed By crystalmsc
January 14, 2020

I've been looking for a plugin synth with a thick and organic character which is lacking in the current market. So glad to finally got this one! It's not surprising since the developer is a former Ensoniq's software development team. The synth got that 80-90's power synth character, with a warmth and depth, rarely found on plugins. Another great thing is that the developer is very communicative and updating the plugin consistently. They're working on some massive CPU improvements, which is going to make the synth even greater. I can't wait for the sampler module, with some layering of 8-bit samples it has a potential for becoming something like the Mirage Soundprocess OS. Or with 6 layers of 12/16-bit, reaching the TS territory. The effects reminds me a bit of the glorious DP4+. So excited with the future of the development. Thank you to the developer for creating such an amazing synth.

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Reviewed By neigui
November 3, 2019

I sued the free version before, then i bought this year.It's cool, i dont like the modular synth, but this plugin is difference.Its eaasy to understand how it is work. Good sound and free creative.I love it. I hope the developers could reduce the use of CPU and develope more cool skins.

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Reviewed By Ojaix
October 30, 2019

All I can say is this is way more value than what I paid for it. Loads of features, loads of very rich preset/samples and just a very high-quality synth in every way.

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Reviewed By gerain-san
September 19, 2019

This synth is very cool. It has nice features for sound design issues. I would like developer to work towards decreasing the CPU usage, but in general I can completely recommend this synth. I like to support indie developers of vst's.

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Reviewed By AmbieticA
June 10, 2019

After decades of sound design using multiple synthesizers and synthesis techniques, I believe I've finally found the "Holy Grail" of synthetic design using Fathom. It has seemingly limitless prospects, combined with the cleanest upper register audio I have ever heard! Using multiple synthesis methods, with such an open modular system, will leave any serious sound designer in awe over the complex potential that awaits them. Fathom has found a permanency within my sound design arsenal like no other synth ever has, and I feel like I've barely scratched the sound design "possibility" surface, as it feels like an infinite palette of sound awaits my further exploration into the depths of this unique synthesizer.

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Discussion: Active
Scrubbing Monkeys
Scrubbing Monkeys
13 August 2017 at 9:26pm

I have been using Fathom for only a few months now. I started on version 1.0.7. At this point it is up to 1.0.11. It has a bucket load of features but a few that really grab me are the extremely powerfull envelopes and the built in delay. You can not only draw your envelopes but can double, triple............ and so on giving you a sequencer type feel. The delay is a three headed monster giving you COMPLETE control over left, right and center. This synth is capable of just about everything out there with alot of stuff we havent seen. I can see this being used alot for evolving soundscapes and one finger rhythmic dances. At this point it has a firm direction, is stable and a pleasure to program. Looking forward to the finer details.




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Fathom Synth

Average user rating of 4.65 from 20 reviews

Seaweed Audio
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