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SEO: free tools, comparison pages and the SEO.md playbook - #32
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Free tools, one distinct tool per page (near-duplicate keyword pages would be doorway pages): - /free-architecture-diagram-generator: describe a system or paste a GitHub repo; opens the editor generating it. /ai-architecture-diagram- generator redirects here (308) so "free" and "AI" searches share one page. - /free-diagram-generator: Mermaid text to a laid-out diagram through the real pipeline (dry-run preview, nothing stored), PNG/SVG download, "Edit in ArchDraw". SVG shown as <img> so it cannot run script. - /system-design-calculator: QPS, peak, storage and bandwidth estimates (pure, tested lib/site/capacityEstimate.ts), latency and powers-of-two tables, links into the glossary. Comparisons: /alternatives and Eraser, draw.io, Lucidchart pages with an at-a-glance table, "Choose them if" / "Choose ArchDraw if" and FAQ. Claims limited to public facts checked 2026-11-07; prices left out. Sitemap, robots allow and footer links for all of them.
Every SEO technique applied so far (audit, metadata and canonicals, crawling and structured data, intent mapping, server-rendered content, written guides, glossary, internal linking, free tools, comparisons, quality gates, measurement checklist, lessons) with a change log by PR, written to be replicated on other sites. AGENTS.md points to it.
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Summary
Free tools
Each page is one distinct, working tool. Near-identical pages aimed at keyword variants would count as doorway pages under Google's spam policies.
/free-architecture-diagram-generator/editor?generate=). It has six one-click example prompts./ai-architecture-diagram-generatorredirects here permanently (308), so "free" and "AI" searches share one page./free-diagram-generatorPOST /api/diagram/loadwithdryRunandpreviewstores nothing and is limited to 300 requests an hour. Clean or hand-drawn style, PNG or SVG download, and Edit in ArchDraw, which saves a session and opens/editor?session=. The SVG is shown as an<img>, so nothing in it can run as script./system-design-calculatorlib/site/capacityEstimate.ts. It has example presets, latency and powers-of-two tables, and links to glossary terms.Comparison pages
/alternativesplus pages for Eraser, draw.io and Lucidchart. Each has an at-a-glance table, "What they do well", "What ArchDraw does differently", "Choose them if" and "Choose ArchDraw if", an FAQ (FAQPage), and a prompt box.SEO.mdA playbook and case study of every SEO technique applied so far, with a change log by PR, written so the steps can be repeated on other sites.
AGENTS.mdpoints to it.Also: sitemap entries,
robots.txtallows and footer links for every new page.Base:
feat/system-design-glossary(#31). Merge in order: #28, #29, #30, #31, then this.Test plan
tscand eslint clean/api/diagram/loaddraws the tool's example in both styles, the SVG contains no<script>, and Edit in ArchDraw gets a session id/ai-architecture-diagram-generatorreturns 308 to the new URL; all new pages return 200 (480–650 words)next devprocesses share.next.