I'll tell you when it matters.

What you are signing up for

• Major news only. The App Store release, and the rare occasion something changes that a person waiting for the app would actually want to know. A handful of emails a year at most, and quite possibly fewer.
• Not a build-by-build feed. Every build handed to a tester is written up on the updates page, and that is where the release-by-release detail stays. You are not going to get an email each time a chevron gets straightened.
• You confirm it first. Nothing is sent to you until you click a link in a confirmation email, so somebody typing your address in by mistake cannot sign you up.
• One click out. Every email carries an unsubscribe link that works on its own — no account, no password, no reply needed.
• Your address, and nothing else. No name, no tracking pixels, no third-party mailing service. The list lives in a database on my own Cloudflare account. The privacy policy sets out exactly what is stored and for how long.

This list is the website, not the app. HorseDex itself still has no account, no server and collects nothing — signing up here does not change that, and the app has no idea this list exists.