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# Comparisons

Honest comparisons between aDNA and other knowledge architectures. Every system has strengths — these pages help you understand when aDNA is the right fit.

[aDNA vs. PARA Two systems for organizing knowledge — one designed for personal productivity, the other for AI-native project collaboration.](/learn/comparisons/adna-vs-para)[aDNA vs. Zettelkasten Two knowledge systems built on connected notes — one optimized for human creative thinking, the other for human-agent collaborative projects.](/learn/comparisons/adna-vs-zettelkasten)[aDNA vs. Notion A standard for AI-native knowledge architecture vs. a SaaS platform for team collaboration — different layers, different trade-offs.](/learn/comparisons/adna-vs-notion)[aDNA vs. Johnny.Decimal Two systems for organizing files — one uses a universal numbering scheme, the other uses a typed triad with agent governance.](/learn/comparisons/adna-vs-johnny-decimal)[aDNA vs. Plain Markdown The most common question: "Why not just use a folder of markdown files?"](/learn/comparisons/adna-vs-plain-markdown)