Short version. There's no account, nothing about you is saved to a profile, and this site doesn't run any analytics or tracking.
The recommendation tool. Your swing and club profile is used to generate your results and isn't stored afterward — there's no login and no saved history, so closing the tab is the same as it never having been kept in the first place.
The "suggest a club" form. This stores the brand, model, category, year, and any notes you enter. If you choose to leave an email, it's stored for exactly one reason: to let you know if that club gets added to the catalog. Leaving it blank is fine — nothing on this form requires it, and the suggestion is saved either way.
The feedback form. This stores your message and, if you gave one, where on the site it applies to. No email is collected on this form at all — if you want a reply, there's currently no way to leave contact info on it.
Analytics. This site uses Google Analytics to count visits and see which pages and guides get read, which is how we know whether any of this is useful to anyone. It sets cookies in your browser and Google receives your IP address and the pages you view. We record two things beyond page views: that a recommendation was run, and that a retailer link was clicked — never any of the answers you gave the tool. Google's ad-personalisation and audience-building signals are switched off, so this measures traffic and is not used to build advertising profiles. No other analytics, and no ad pixels.
Affiliate links. Clicking through to a retailer (PGA Tour Superstore, Callaway Certified Pre-Owned, 2nd Swing, GlobalGolf) leaves Stickly, and that retailer's own tracking and cookies apply from that point — that's standard for any affiliate link and outside our control.
Questions. Use the feedback form on the tool page — it reaches a real inbox.