Helm

Free plan Open source LinuxMacWindows

What Helm is

Helm is a free software synthesizer for creating electronic music on a computer. It is available as a standalone application or as a plugin in LV2, VST, VST3, or AU formats, with GNU/Linux, macOS, and Windows versions in 32-bit and 64-bit editions. Its sound tools include dual oscillators with cross modulation, unison, a sub oscillator, filters, modulation, a step sequencer, an arpeggiator, and audio effects. MIDI Learn maps a MIDI control to a knob or slider. The maker describes Helm as DRM-free software that users can study, change, and redistribute in original or modified form. Its FAQ says the person who plays a sound made with Helm holds its copyright. Listed system requirements include Windows 7 or later, macOS 10.7 or later, Ubuntu Trusty 14.04 or later, and Debian Jessie or later. The project description identifies the release as beta and notes outstanding bugs. The maker asks bug reporters to include details such as what happened, crash reports, operating system, and whether they use the plugin or standalone version.

Who it suits

Helm suits people making electronic music who want a standalone synthesizer or a plugin for a supported format and system. Its free-software license also suits users who want to study, change, or redistribute the software.

What it does well

Free software with no DRM.
Standalone app and multiple plugin formats.
Includes sequencer, arpeggiator, and audio effects.
Available for Linux, macOS, and Windows.
Users can study, change, and redistribute it.

What to know first

The project is in beta.
The project description notes outstanding bugs.

Limits

Helm is offered on a pay-what-you-want basis, and users may pay nothing. The project is described as beta with outstanding bugs; listed system requirements include Windows 7 or later, macOS 10.7 or later, Ubuntu Trusty 14.04 or later, and Debian Jessie or later.

Plans

Plan	Billed and limits	Price
Pay what you want	Optional contribution; page displays $5 input and $10, $25, $50 and $100 amounts · Standalone or plugin download · no DRM · pay nothing permitted	On request

As tytel.org lists them, read 15 Oct 2026. The maker's own page has the final word.

Getting started

Visit https://tytel.org/helm/.
Choose the GNU/Linux, macOS, or Windows version matching your system and 32-bit or 64-bit setup.
Choose the standalone version or a supported plugin format: LV2, VST, VST3, or AU.
Run Helm or load its plugin in a compatible host.
Use MIDI Learn to map a MIDI control to a knob or slider, if needed.

Verdict

Helm offers a broad set of synthesis and modulation tools in standalone and plugin forms, and is free software. Its beta status and outstanding bugs are worth considering.

Questions

How much does Helm cost?

Its Pay what you want plan is free, and users are free to pay nothing.

Which operating systems does Helm support?

The maker lists GNU/Linux, Mac OSX, and Windows, with 32-bit and 64-bit versions. Listed requirements include Windows 7 or later, macOS 10.7 or later, Ubuntu Trusty 14.04 or later, and Debian Jessie or later.

Can Helm run as a plugin?

Yes. It is available as an LV2, VST, VST3, or AU plugin, as well as a standalone synthesizer.

Is Helm open source?

The maker describes it as free software that can be studied, changed, and redistributed in original or modified form, without DRM.

Who owns sounds created with Helm?

The FAQ says the person who played a sound created with Helm holds its copyright.

What is Helm's current release status?

The project description says the release is in beta and has outstanding bugs.

Facts from Helm's own pages

Build requirements: The source build instructions require platform build tools; AAX builds need the AAX SDK and macOS AU builds need Apple's CoreAudio SDK. · github.com, 15 Oct 2026
Created sounds: The FAQ says sounds created with Helm belong to the person who played them, who holds their copyright. · tytel.org, 4 Oct 2026
Documentation depth: The official manual is a 32-page v0.9.0 PDF covering synthesis modules, modulation, patch browsing, audio settings and performance controls. · tytel.org, 15 Oct 2026
Effects: Built-in effects are formant filtering, stutter, distortion, delay and reverb. · github.com, 15 Oct 2026
Filters: Helm provides blendable 12 dB and 24 dB low-, band- and high-pass filters plus low-, band- and high-shelf filters. · tytel.org, 15 Oct 2026
Known limitations: The GitHub project description says the release is in beta and has outstanding bugs. · github.com, 4 Oct 2026
Licence: The source repository identifies Helm as GPL-3.0 licensed open-source software. · github.com, 15 Oct 2026
License and DRM: The maker describes Helm as free software that can be run without DRM, studied, changed and redistributed in original or modified form. · tytel.org, 4 Oct 2026
Limit: high-resolution Windows GUI: A KVR reviewer reports that Helm's interface becomes unusable on Windows 11 with UHD monitors, although hosted-plugin use still worked. · kvraudio.com, 15 Oct 2026
Limit: learning curve and interface: Equipboard reviews mention a steep learning curve, while another reviewer calls the interface visually cluttered or unattractive. · equipboard.com, 15 Oct 2026
Limit: maintenance: GitHub shows the official repository was archived and made read-only on February 8, 2025. · github.com, 15 Oct 2026
Limit: premium feature gap: Data Broth says newer free instruments such as Vital and Surge offer substantially more capability, while AudioTechnology's summary says Helm lacks some premium-level polish. · databroth.com, 15 Oct 2026
Limit: sound character: Data Broth describes Helm as mainly digital and harsh, with limited usefulness for analog-style sounds. · databroth.com, 15 Oct 2026
Limit: stability: The project README warns that the release is beta and has outstanding bugs. · github.com, 15 Oct 2026
Limit: Unity availability: Unity marks the Audio Helm asset deprecated, unavailable for purchase and unsupported by its publisher. · assetstore.unity.com, 15 Oct 2026
Maker identity: The official Helm manual identifies Matt Tytel as the developer. · tytel.org, 15 Oct 2026
Maker location: Matt Tytel describes himself as a software synthesizer developer in the Boston area. · tytel.org, 15 Oct 2026
MIDI control: The manual explains how to map a MIDI control to a knob or slider using MIDI Learn. · tytel.org, 4 Oct 2026
MIDI learn: The manual describes right-click MIDI Learn for assigning a hardware MIDI control to a knob or slider. · tytel.org, 15 Oct 2026
Modulation: Modulation sources include two monophonic LFOs, one polyphonic LFO, three envelopes, keyboard controls, random values and polyphonic aftertouch. · github.com, 15 Oct 2026
Notable news: Matt Tytel announced the rebranding from Twytch to Helm on May 8, 2015. · tytel.org, 15 Oct 2026
Oscillators: The synthesizer has two oscillators with cross modulation and up to 15 unison oscillators per oscillator. · github.com, 15 Oct 2026
Plugin formats: The official site distributes Helm as standalone software and LV2, VST, VST3 and AU plugins. · tytel.org, 15 Oct 2026
Polyphony: Helm supports 32 simultaneous voices. · github.com, 15 Oct 2026

Where Helm stands on Freedom251

Software Synthesizers#3 of 38