Eraser

Diagramming · Free · since 2022

Eraser is a technical design tool for architecture diagrams, design docs, and cloud diagrams. It handles architecture diagrams, cloud diagrams, docs, and ai diagram, and it's best suited for engineering teams wanting docs-as-diagrams. Launched in 2022, it's a relatively recent entrant that's been gaining traction.

The free plan is free for 5 documents — enough for most people to evaluate whether it fits. It's designed for small teams, striking a balance between simplicity and collaboration features.

pros

Includes Architecture Diagrams as a core feature, purpose-built for diagramming workflows
Includes Cloud Diagrams as a core feature, purpose-built for diagramming workflows
Free for 5 documents — generous enough for most small teams to get real work done
Includes docs alongside the core feature set — fewer separate tools needed

cons

Free plan exists but key features are locked behind the paid upgrade
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
Limited team/admin features if your organization eventually scales up

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