One site means one Astro project. If you have a monorepo with multiple Astro sites, each one counts separately, if added to Zero. A single repository with one Astro project counts as one site.
Nothing breaks. Your content stays safe in your GitHub repository, exactly where it always was. You just need to pick a plan to keep editing through Zero. Since Zero never touches your code, your site keeps working regardless.
Yes, you can upgrade or downgrade at any time. Changes take effect immediately and billing is prorated.
A content entry is a single file inside an Astro content collection — for example, one blog post, one changelog entry, or one page. Images, components, and configuration files do not count toward the limit.
Early adopter pricing is locked in for as long as your subscription stays active. You keep the 50% discount forever. It only goes away if you cancel and resubscribe later.
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Everything you need to manage content, at every scale.