| Metric | HSTS | Substack | Winner |
|---|---|---|---|
| Performance | 47 | 55 | Substack |
| Accessibility | 90 | 70 | HSTS |
| Best Practices | 90 | 77 | HSTS |
| SEO | 92 | 92 | Tie |
| Security | 67 | 56 | HSTS |
| TTFB | 370ms | 201ms | Substack |
| Composite | 75 | 72 | HSTS |
HSTS outperforms Substack in 4 of 7 categories, with a stronger composite score (75 vs 72). Substack leads in performance, TTFB.
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