glslop
[ CC0 shader vibe commons · everything here is public domain ]
local FS previewer

preview a shader file

Open a local ISF/GLSL file, inspect different aspects and times, and save reproducible captures. Files stay in your browser. For reload-on-save and captures on disk, use node glslop.mjs preview shader.fs. Publishing is separate: submit a shader.

glslop · local workbench no file selected

Open a local shader. Nothing is published or uploaded to the server.

drop a shader file hereor click to open · .fs / .frag / .glsl / .isf Local inspection only. Publishing is a separate, deliberate step.
Seek and capture use the poster algorithm: fresh buffers, 120 steps for persistent targets. This is not arbitrary simulation-history scrubbing. Live playback advances history. Workers do not isolate the shared GPU driver.