Open .md files — or just paste — and get clean rendering of everything AI tools produce.
Short answer: if you want to read Markdown on iPhone — especially the Markdown that ChatGPT, Claude or DeepSeek hand you — AI Artifact Reader renders it properly (GFM tables, code highlighting, Mermaid diagrams, KaTeX math), works fully offline, and exports the whole document as a long image or PDF. Editors like iA Writer or Obsidian are great for writing; this is the reading-and-sharing end of the pipeline.
AI output leans on the fancy parts of Markdown: nested tables, task lists, fenced code in five languages, math like $E=mc^2$, and Mermaid flowcharts. iOS Quick Look shows .md as plain text; many lightweight viewers skip Mermaid and KaTeX entirely, so diagrams appear as raw code. A reader built for AI output has to cover the full GFM + Mermaid + KaTeX stack — that's exactly what AI Artifact Reader renders, on-device.
If you write Markdown daily, keep your editor (Obsidian, iA Writer, Bear are excellent). But when the Markdown comes from an AI and your job is to read it, keep it, or send it to someone as a clean image — an editor is the wrong tool. The flow “copy from ChatGPT → paste → read → export long image” is a 10-second loop in AI Artifact Reader.