Integration boundaries
CloudCannon Client Sharing can let clients edit without a CloudCannon account by using a site-specific password. That shared access cannot attribute changes to different editors. ReCopyFast uses individual invited email addresses and six-digit codes, but it does not sync edits to Git.
ReCopyFast can be added across different site stacks because its integration is a script, but installation requires permission to add a script and a compatible Content Security Policy (CSP). It edits existing authored copy; it does not build pages or migrate a site. Published edits are applied in the visitor's browser after the page loads. Visitors without JavaScript, and crawlers that do not render JavaScript, see the original HTML copy, so put SEO-critical copy in the site's source as well.