DiagramPreview

What it does

Preview and convert Mermaid, PlantUML, Markdown, Graphviz, D2, draw.io, mind maps, JSON, YAML and developer diagrams online.

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  Mermaid Chart2023 · ▲176

  A smarter way to create diagrams

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  Beauty DiagramMay 2026 · ▲98

  Diagrams that don't look like they were auto-generated

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  Sketch2scheme2024 · ▲208

  Convert hand-drawn diagrams into digital schemes

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  Mermaid Whiteboard2024 · ▲239

  Drag & drop whiteboard with text based diagramming

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  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…

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  DrawSQL2018 · ▲246

  Better entity relationship diagrams for your database

• 
  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▲397

  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

• 
  Fundraisly▲1,544

  AI fundraising agent that finds investors and books meetings

  AI · Jun 2026 · fundraisly.com

• H6
  Homebrew 6.0.0▲1,481

  Today, I’m proud to announce Homebrew 6.0.0. The most significant changes since 5.1.0 are a new tap trust security mechanism, the new faster, smaller, default internal Homebrew JSON API, sandboxing on Linux, better defaults informed by our user survey, many brew bundle improvements, improved performance and initial support for macOS 27 (Golden Gate). Happy to discuss any questions here!

  Dev tools · Jun 2026 · brew.sh

• PU
  Performative-UI – A react component library of design tropes▲1,181

  hope you enjoy

  Life & fun · Jun 2026 · vorpus.github.io

• 
  Upstream▲977

  The inbox designed for humans and agents

  AI · Jun 2026 · upstream.do

• 
  Goldfish▲962

  Press Option. It knows your work and replies like you

  AI · Jun 2026 · goldfish.sh

• IM
  I made Google Trends for Hacker News by indexing 18 years of comments▲822

  Life & fun · Jun 2026 · hackernewstrends.com