Get on the list.

KerfSense is being built toward release, and early access opens here first. One address, one field, and you're on it.

The sign-up check could not be completed.

The human-check widget didn't confirm you — it may have failed to load, or been blocked by an extension or a network fault. You can retry below, or skip the form entirely: email waitlist@kerfsense.com and you'll be added by hand.

That address couldn't be accepted.

Check it for typos and try again — and note the rule beside the field: the first character before the @ must be a letter from a to z, a digit or _ — capitals are fine, the address is stored lowercased, but an accented or non-Latin first letter is not. Any other character in front — +, -, =, . or any other symbol — is refused.

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Your address was not stored. Please try again in a little while.

Join the waitlist

What this stores

Joining the list stores exactly three things:

your email address, lowercased
when you joined, in UTC
a source tag — the word site when you sign up here

Nothing else. No names, no IP addresses, no user agents — and the form never reveals whether an address is already on the list: joining twice looks exactly like joining once.

The sign-up check is Cloudflare Turnstile, loaded from https://challenges.cloudflare.com — the only other origin this page is allowed to reach. Cloudflare's edge injects a performance beacon into this page; the Content-Security-Policy blocks it from loading. The widget runs in its own frame under Cloudflare's terms; this page adds no analytics of its own.