Mermaid Chart vs Eraser
Detailed side-by-side comparison to help you choose the right tool
Mermaid Chart
🟡Low CodeDiagramming & Docs
Mermaid Chart is the commercial collaborative diagram editor from the team behind the popular open-source Mermaid diagramming library, adding AI-assisted diagram generation, real-time collaboration, version history, and team workspaces to the diagram-as-code workflow loved by engineers.
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CustomEraser
🟡Low CodeDiagramming & Docs
Eraser is an AI copilot for technical design that turns natural-language descriptions into architecture diagrams, sequence diagrams, ERDs, and cloud topology drawings — combining a fast diagramming canvas with an AI assistant tuned for software engineers writing design docs.
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Mermaid Chart - Pros & Cons
Pros
- ✓Text-based diagram format is durable, diffable, and checks cleanly into Git
- ✓Close alignment with the upstream Mermaid ecosystem makes it a natural hosted editor for Mermaid users
- ✓AI generation handles the most common diagram types such as sequence, flow, and C4-style diagrams reliably
- ✓Embeddable viewer keeps live diagrams in docs without exporting stale PNGs
- ✓No proprietary file format — exports back to the same Mermaid syntax open source uses
Cons
- ✗Visual editor is less polished than Figma-class tools for free-form whiteboarding
- ✗AI generation quality drops on niche diagram types like packet or sankey
- ✗Integration depth may need evaluation for teams standardized on incumbent diagram tools
- ✗Enterprise controls and advanced administration require higher-tier plans
- ✗Per-seat pricing on Team plans gets expensive for occasional contributors
Eraser - Pros & Cons
Pros
- ✓Diagram-as-code round-trip is the right architecture for AI-generated diagrams because generated diagrams remain editable manually or through AI edits instead of becoming static images.
- ✓Engineering-specific use cases are well covered: the site lists architecture diagrams, data flow diagrams, sequence diagrams, ERDs, network diagrams, Kubernetes architecture, API diagrams, auth flows, CI/CD diagrams, and threat modeling.
- ✓The Free plan is useful for evaluation because it includes $0 per member per month pricing, 3 files, AI diagram generation, 7-day version history, unlimited guests, diagram-as-code, Markdown notes, and four named integrations.
- ✓Starter scales quickly for active teams: $15 per member per month annually or $20 monthly includes unlimited files, 40 AI diagrams, 90-day version history, private files, 20 custom icons, and API calls.
- ✓Eraser fits engineering documentation workflows better than many visual whiteboards because it supports GitHub commits, Notion embeds, live-updating Confluence embeds, VS Code editing, and export to PDF, PNG, SVG, and Markdown.
- ✓Customer examples on Eraser’s site report concrete outcomes, including 10x faster diagram creation, documentation growing from 4 documents to over 110 in six months, and a 30% developer productivity increase in one case study.
Cons
- ✗The Free plan is tight for ongoing work: 3 files and limited AI diagrams are enough to test the product, but most teams documenting multiple systems will need a paid plan.
- ✗Business pricing is relatively high for small teams at $45 per member per month annually or $60 monthly, especially if the team mainly needs occasional diagrams rather than daily technical documentation.
- ✗Eraser is specialized for engineering visuals, so it is less suitable than Miro, FigJam, or Figma for broad workshops, product discovery boards, marketing visuals, or high-fidelity UI design.
- ✗The website shows a minor inconsistency around free AI diagram limits: the pricing table lists 3 AI diagrams, while the FAQ says free teams can generate up to 5 AI diagrams or edits.
- ✗Advanced controls such as SAML SSO, reference diagrams, unlimited version history, usage reporting, flexible deployments, and customer success are reserved for Business or Enterprise tiers.
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