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Fathom Synth

Software Synthesizer by Seaweed Audio
Fathom Synth
What is it?
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Fathom Synth

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 CM has enough features to leave even seasoned synthesists gasping for air. Despite its bottomless potential, Fathom CM 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

{See video at top of page}

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

User Reviews Average user rating of 4.65 from 5 reviewsAdd A Review

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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Reviewed By glokraw
June 9, 2019

I like things that are simple and symmetrical. The Fathom modular interface has the feel of a guitar pickers pedalboard, like IK's Amplitube, left-to-right and linear, easy to understand the flow at a glance, and easy to modify. The parts surrounding the modules panel have the same kind of symmetry I like in BlueCat's Axiom effects suite, very rectangular and orderly, an easy reach for something that's complex, but not visually cluttered by things not in use. I love that you only see a module's parameters when you WANT to see them. And I was shocked to see that many of the effects modules are the equal or better than popular commercial plugins, each one just waiting for a session to fully explore them. And what are effects, without great sounds to grind, pound, and croon at? The Fathom sound is hard for me to compare and pinpoint, because I don't have a vast collection, or deep experience, but I'll say pop the top off your blender, throw in SynthMaster One, Hybrid 3, Bazille, Reaktor Pprism, and Ugo's nicely metalic Texture II and M-Theory, whirl them to a frenzy, and ...be happy... When I see pics and reviews of modular synths and gear, the Muse usually throws on her parka, and runs to the truck to listen to an old 8-track tape of the Moody Blues, with the heat cranked up. But with Fathom, it's been different, she whispers tempting suggestions, with deep breathing. and high expectations. And speaking of high, the price isn't. The author has a target price range in mind, that won't lock people out of having such a great instrument, and a clear vision for imppovements, and new capabilities. Which don't include fiascos and wobblers in the copy-protection column. Buy early, update often, and help Fathom reach it's potential. CheersRead more

Reviewed By irism
June 9, 2019

So much potential for its value. Don't let the price tag scare you.

Designing patches couldn't be much more easier than this. Just select the module you want, and drag cables to connect input to output. Layout is so straightforward. Everything you need to know about the synth is written nicely and precisely within the PDF manual. I'm using at least 4 instances of Fathom for layering in each of my production because of its versatility.

Also, the developer is an awesome person, kind and attentive to questions. You will not regret picking this up.

If you still have doubts, try out the fully functioning freeware version (mono).

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Reviewed By tony10000
June 8, 2019

I'll tell you, I played with the CM version of Fathom and bought the full version a few days ago.

This is a killer synth and an amazing value! It is better than synths costing 5X as much! If you haven't bought a copy of Fathom, what are you waiting for. It has one of the best designed UIs I have ever seen.

The only issue I have with it is CPU usage but that can be managed and the dev is working on optimizing the code.

Investing in the Fathom platform is a no brainer. Just do it.

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