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Output Portal · OutputFree alternatives to Output Portal

A granular FX plugin that turns any sound into shimmering, glitchy, evolving textures with big preset-driven moves. Here are 3 genuinely free options, ranked by how close they get.

01

Emergence (free version)

by Daniel Gergely · Real-time granular effect

Real-time granular effect with multiple grain streams and visual feedback. The free version has fewer features than the paid one.

VST3AUmacOSWindows
Free · link checked 2026-10-24 · source · Free-forever version with fewer features; a paid upgrade unlocks the rest. AU is macOS only.
Get it free ↗
02

Fracture

by Glitchmachines · Buffer / glitch effect

Buffer-effect glitch machine for robotic stutters and artifacts. Rougher and less polished than Portal, but very characterful.

VST3AUmacOSWindowsNeeds free checkout on the Glitchmachines store
Free · link checked 2026-10-24 · source
Get it free ↗
03

Hysteresis

by Glitchmachines · Glitch delay with stutter

Glitch delay with stutter and modulation. Good for the rhythmic side of Portal; no true granular engine.

VST3AUmacOSWindowsNeeds free checkout on the Glitchmachines store
Free · link checked 2026-10-24 · source
Get it free ↗
Free means free: no trials, no time limits, no demos. Some need a free account; we flag those. Spot something wrong or a better swap? Tell us.