Siren – featured Mermaid DSL targeting 4 Languages with Fable

Hello everybody! I just finished a hobby project. It is a F# library for creating Mermaid graph YAML. I used Fable to transpile to JS (+types) and python, and added a convenience C# access layer. This means you have a nice API for creating Mermaid graphs in 4 languages. My documentation also includes code examples for all languages and a blogpost on library design. Would appreciate feedback!

Visit github.com ↗Alternatives

Does the same job

all alternatives →

Mermaid Chart2023 · ▲176
A smarter way to create diagrams
IB
I built an app to generate story relationships using Mermaidjs2025 · github.com · ▲144
Line9 – A Mermaid rendering engine with its own layoutAug 2026 · line9.ai · ▲87
Line9 is a new rendering engine for Mermaid flowchart diagrams that aims to remove the need for manual adjustment of layout. Mermaid is a popular text-based language for describing multiple types of diagrams. Several Mermaid rendering engines already exist. Most, like the original mermaid.js, use Dagre or ELK graph drawing libraries to automatically lay out their diagrams. I’ve used Mermaid for the past four years but often recreated my flowcharts in a diagram editor so that I could modify the layout to something that better suited my needs. Use Line9 when you want an automatic flowchart…
MA
Mermaid ASCII Diagrams2024 · mermaid-ascii.art · ▲234
GF
GUI for editing Mermaid class diagrams2025 · docs.mermaidchart.com · ▲230
Mermaid AI2024 · ▲256
Maximize your diagramming efficiency with Mermaid AI

More dev tools this month

the category →

Dograh▲592
The open source VAPI alternative
Dev tools · 25d ago · dograh.com
Meridian▲530
Don't let your work go unnoticed. Get promoted!
Dev tools · 20d ago · meridiona.com
x1▲516
Lovable for iPhone apps go from idea to App Store
Dev tools · 11d ago · x1.new
The GTM Co-Founder▲402
Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com
Open-Source eInk Bike Computer▲398
OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Dev tools · 2d ago · opentrailpaper.com
Nuphos▲380
The AI-Native DevOps Workspace.
Dev tools · 24d ago · nuphos.ai

Launched alongside, June 2024

the whole month →

Pygma▲1,409
AI copilot for Instagram
AI · 2024 · pygma.me
Cello▲1,347
Easiest way to add a referral program to your SaaS
Growth · 2024 · cello.so
La Growth Machine▲1,216
Create personalized, multi-channel conversations at scale
AI · 2024 · lagrowthmachine.com
FlowMapp 3.0▲1,147
Visual website planning in the most powerful way
Work · 2024 · flowmapp.com
Superhuman 2.0▲1,143
Revolutionary AI email, reimagined for teams
AI · 2024 · superhuman.com
PyjamaHR▲1,132
Hiring on autopilot. The AI applicant tracking system (ATS).
Work · 2024 · pyjamahr.com