Helm
What it is
Helm is a free software synthesizer for creating electronic music on a computer. It runs as a standalone application or as a plugin in LV2, VST, VST3, or AU formats, with GNU/Linux, Mac OSX, and Windows versions in 32-bit and 64-bit editions. Sound-shaping tools include dual oscillators with cross modulation, unison, a sub oscillator, filters, modulation, a step sequencer, an arpeggiator, and audio effects. MIDI Learn can map a MIDI control to a knob or slider.
The maker describes Helm as software without DRM that users can study, modify, and redistribute in original or changed 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 says the release is in beta and has outstanding bugs. For bug reports, the maker asks users to include details such as what happened, crash reports, operating system, and whether they use the plugin or standalone version.
For and against
For
- Available as a standalone synthesizer
- Supports LV2, VST, VST3, and AU
- Includes MIDI Learn controls
- Free software without DRM
- Created sounds belong to the person who played them
Against
- The project is described as beta
- Outstanding bugs are noted
The verdict
Helm combines a range of synthesis and sequencing tools with standalone and plugin use across several operating systems. Its beta status and outstanding bugs are worth considering before adopting it in a project.
Who it suits
Helm suits people making electronic music on GNU/Linux, MacOS, or Windows who want a standalone synthesizer or plugin. Its free-software terms may also appeal to users who want to study or modify the program.
Plans and prices
Pay what you want
Standalone or plugin download · no DRM · pay nothing permitted
Read 15 Oct 2026 · tytel.org
On the record
- 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 · read 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 · read 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 · read 15 Oct 2026
- Effects
- Built-in effects are formant filtering, stutter, distortion, delay and reverb.github.com · read 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 · read 15 Oct 2026
- Known limitations
- The GitHub project description says the release is in beta and has outstanding bugs.github.com · read 4 Oct 2026
- Licence
- The source repository identifies Helm as GPL-3.0 licensed open-source software.github.com · read 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 · read 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 · read 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 · read 15 Oct 2026
- Limit: maintenance
- GitHub shows the official repository was archived and made read-only on February 8, 2025.github.com · read 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 · read 15 Oct 2026
- Limit: sound character
- Data Broth describes Helm as mainly digital and harsh, with limited usefulness for analog-style sounds.databroth.com · read 15 Oct 2026
- Limit: stability
- The project README warns that the release is beta and has outstanding bugs.github.com · read 15 Oct 2026
- Limit: Unity availability
- Unity marks the Audio Helm asset deprecated, unavailable for purchase and unsupported by its publisher.assetstore.unity.com · read 15 Oct 2026
- Maker identity
- The official Helm manual identifies Matt Tytel as the developer.tytel.org · read 15 Oct 2026
- Maker location
- Matt Tytel describes himself as a software synthesizer developer in the Boston area.tytel.org · read 15 Oct 2026
- MIDI control
- The manual explains how to map a MIDI control to a knob or slider using MIDI Learn.tytel.org · read 4 Oct 2026
