Show HN: Predictygraph – diagrams as text, with reusable blocks and plain CSS

Category: devtools

Tags: diagram-dsl, svg-generation, graphviz-alternative, css-styling, python

Score: 6.3/10 (Innovation: 6, Technical: 7, Documentation: 7, Utility: 5)

Predictygraph is a Python-based diagram DSL that renders static or animated SVGs without a browser, featuring per-group layouts, reusable blocks, and plain-CSS styling. It distinguishes itself from Graphviz and Mermaid by allowing local layout control so changes stay local, and by producing deterministic output. The project is well-documented with a spec, examples, and an agent skill, though it is early-stage (no stars, 1 HN point).

Target audience: backend devs, technical writers, DevOps engineers

Repository: https://predictygraph.github.io/ · Python · Apache-2.0

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