Helm vs Thorn

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, Mac OSX, 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 lets users assign a MIDI control to a knob or slider. The maker describes Helm as software that can be run without DRM, studied, changed, and redistributed in original or modified form. The FAQ says the person who plays a sound made with Helm holds its copyright. Listed requirements include Windows 7 or later, MacOS 10.7 or later, Ubuntu Trusty 14.04 or later, and Debian Jessie or later. The project is described as being in beta with outstanding bugs. For bug reports, the maker asks users to include details such as what happened, crash reports, their operating system, and whether they use the plugin or standalone version.

Thorn is a software synthesizer for modern electronic music production, available as a 64-bit plugin for Windows and macOS. Its three spectral oscillators shape harmonics and support FM, ring modulation, pulse-width modulation and hard sync. Sixteen-frame spectrum tables provide editable, morphable harmonic sources, while additive spectral synthesis, harmonic filtering and spectral effects form the sound engine. Two analog-modeled multimode filters and nine effects extend sound shaping. Modulation includes three ADSR envelopes, three LFOs and two multistage envelopes. A flexible 16-step arpeggiator outputs MIDI, and a grid-based Glitch sequencer supplies another sequencing method. Plugin Alliance lists more than 600 presets. Thorn runs in VST2, VST3, AU or AAX hosts and is not a standalone application. Listed operating-system support is Windows 10–11 and macOS 13–26, including Intel and Apple Silicon Macs. A 14-day trial is offered; earlier-license owners are quoted a $19 USD upgrade.