Squarespace combines hosting, templates, and site-management controls in one system, so some technical tasks that would require separate configuration elsewhere are handled by the platform. That does not mean SEO is automatic. You still need to verify what the live site outputs and decide whether each important page is crawlable, indexable, understandable, useful, and connected to related content.
For practical review, separate platform defaults from site-specific decisions. The platform may provide HTTPS, responsive templates, sitemap generation, canonical output, and some structured data, while your implementation determines page titles, descriptions, headings, copy, internal links, image alternatives, custom code, media weight, and the overall information architecture. If a capability matters to a specific page, inspect the rendered page rather than relying only on a settings panel.
The source previously described Squarespace as suitable for e-commerce under 500 SKUs. No supporting source URL is present here, so treat that count as historical editorial guidance rather than a verified platform threshold. Catalog complexity, filtering, templates, structured data needs, internal linking, and operational requirements are more useful decision inputs than a single product count.