tldraw
Diagramming · Free · since 2021 · open source
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tldraw is a open-source collaborative whiteboard with a friendly interface and embeddable SDK. It handles open source, embeddable, multiplayer, and sdk, and it's best suited for developers wanting an embeddable whiteboard canvas. It has been around since 2021, giving it a 5-year head start in building out integrations and refining the product.
The core product is entirely free. Since it's open-source, you can self-host for free with no user limits.
pros
- Open source and transparent
- Open-source codebase gives you full transparency and community-driven development
- Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
- The core product is free with no paywalled essentials
cons
- May lack some advanced features
- Self-hosting is free but requires server maintenance and DevOps knowledge
- Fewer built-in features means you may need additional tools to cover gaps
- Ecosystem of third-party integrations is smaller than the market leaders in diagramming
top tldraw alternatives
Mermaid JavaScript-based diagramming tool that renders diagrams from text definitions. Free 
Lucidchart Intelligent diagramming platform for flowcharts, wireframes, and technical diagrams. Free 
Draw.io (diagrams.net) Free, open-source diagramming tool that works in the browser with no account needed. Free 
FigJam Collaborative whiteboard from Figma for brainstorming, diagramming, and workshops. Free 
Eraser Technical design tool for architecture diagrams, design docs, and cloud diagrams. Free tldraw compared
Mermaid vs tldraw · Lucidchart vs tldraw · Draw.io (diagrams.net) vs tldraw · tldraw vs FigJam · tldraw vs Eraser · tldraw vs Eraser · tldraw vs PlantUML
more diagramming tools
Mermaid JavaScript-based diagramming tool that renders diagrams from text definitions. Free Lucidchart Intelligent diagramming platform for flowcharts, wireframes, and technical diagrams. Free Draw.io (diagrams.net) Free, open-source diagramming tool that works in the browser with no account needed. Free FigJam Collaborative whiteboard from Figma for brainstorming, diagramming, and workshops. Free Eraser Technical design tool for architecture diagrams, design docs, and cloud diagrams. Free E Eraser Technical diagramming tool for software architecture, system design, and engineering docs. Free