TermiFlow

                                                              ┌─────────┐
                                                          ┌──→│  ASCII  │
┌─────────┐        ┌───────────────┐        ┌──────┐      │   └─────────┘
│  Hello  ├───────→│  mermaid.mmd  ├───────→│  tw  ├──────┤
└─────────┘        └───────────────┘        └──────┘      │   ┌───────────┐
                                                          └──→│  Unicode  │
                                                              └───────────┘

        ┌─────────┐
        │  Hello  │
        └────┬────┘
             │
             ↓
     ┌───────────────┐
     │  mermaid.mmd  │
     └───────┬───────┘
             │
             ↓
         ┌──────┐
         │  tw  │
         └───┬──┘
             │
     ┌───────┴───────┐
     ↓               ↓
┌─────────┐    ┌───────────┐
│  ASCII  │    │  Unicode  │
└─────────┘    └───────────┘

Terminal-native Mermaid flowchart renderer

Render Mermaid flowcharts as ASCII/Unicode diagrams directly in your terminal—without a browser.

Mermaid flowcharts · ASCII/Unicode output · v0.2.0 release

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Install TermiFlow

Install on macOS or Linux with Homebrew. It uses a prebuilt binary, so Rust is not required.

brew install dnvt/termiflow/termiflow

Then pipe Mermaid through tw, or use a downloaded binary from the GitHub releases.