Diagrammar: Mermaid Diagram

About

Turn diagram code into interactive diagrams. Diagrammar renders Mermaid, PlantUML, D2, and Graphviz DOT natively on iPhone, iPad, and Mac, without a web view. Paste or open diagram code and see it live: pan, zoom, and explore. Diagrammar detects the format from the code, so you never pick one from a menu. Everything works offline, renders instantly, and follows your system light and dark appearance. FREE, ON EVERY DEVICE Every format renders free, forever, with no trial and no account to make. Start from 27 built-in templates across all four dialects, or paste code from anywhere. Change flow direction, edge routing, and layout algorithm without touching the source. Diagram files show a rendered thumbnail in Files instead of a blank page icon, and on Mac you can press space in the Finder to preview any diagram full size. EDIT WITH A LIVE PREVIEW (PRO) A split-view editor shows the diagram update as you type, and flags syntax problems with line numbers. On iPhone and iPad a per-dialect key bar puts arrows and brackets one tap away instead of two keyboard switches. Flowcharts, sequence diagrams, class diagrams, ER diagrams, state machines, use cases, mind maps, Gantt charts, pie charts, and timelines. DIAGRAMS INSIDE YOUR MARKDOWN (PRO) Open any README or Markdown file and every fenced mermaid, plantuml, d2, or dot block renders inline, with the prose in between. Tap any diagram to open it full size. EXPORT AND SHARE (PRO) PNG and PDF export, print, or copy as image. Select diagram code in any other app and render it straight from the share sheet. Full theme catalog, including the official Mermaid and D2 dialect themes plus Colorful and Monochrome. NATIVE, PRIVATE, OFFLINE Diagrammar has no JavaScript runtime and no networking code at all. It uploads nothing and collects nothing. Your diagrams live in Files and iCloud Drive like any other document. FREE AND PRO Viewing is free on every device. One purchase unlocks the editor, export, Markdown mode, the share extension, and every theme; it covers iPhone, iPad, and Mac together, includes Family Sharing, and never renews. Formats: Mermaid (.mmd, .mermaid), PlantUML (.puml, .plantuml, .iuml), D2 (.d2), Graphviz DOT (.dot, .gv), and Markdown (.md). Built on DiagramKit, the native diagram engine for Apple platforms.