Privacy
Last updated: 2026-05-14
This page in one sentence
Countermark collects your email if you type it into the signup form on the landing page, and the extension — once it exists — reads only the Airbnb pages your browser is already loading and keeps the data inside your browser.
The landing-page email signup
If you type your email into the signup form on the landing page, the email is stored by the email-signup provider Countermark uses (see “Who else sees this” below) for one purpose: emailing you once when the Chrome extension ships, or once if the project is shut down without shipping.
The signup form also captures a single piece of context: a short tag identifying which referral source you came from (for example, “reddit_solotravel” if you arrived via that subreddit’s post). This is stored alongside your email so I can tell which posts produced interest and which did not. The tag is letters, numbers, dashes and underscores only — no IP addresses, no device fingerprints.
What the form does not collect: your name, your IP address (beyond what the provider logs for fraud protection), any tracking cookie, any browser fingerprint, any pixel-based behavioral data. There is no analytics platform on this site.
Who else sees this
The email-signup form posts to one third-party email-signup provider: Buttondown. Buttondown’s privacy policy applies to anything they log. Countermark does not share your email with anyone else — not advertisers, not partners, not future acquirers if the project sells or shuts down. If the project shuts down, the email list is deleted and the deletion is announced in the final email.
The extension — what it will do, once it exists
The extension does not exist yet. When it does, this section will be the source of truth for what it actually does. Today, the design intent is:
- The extension reads only the pages your browser is already loading because you visited them — the same way an ad-blocker or a price-comparison extension reads pages.
- Airbnb page content does not leave your browser. The signals Countermark surfaces are computed locally, in your browser, and stored locally (in IndexedDB or browser cache, depending on the v1 prototype).
- The extension does not log into Airbnb on your behalf, does not store account credentials, and does not see anything Airbnb would not already show you on a listing page.
- Public off-platform data that Countermark cross-references (court records, short-term-rental registries, public Reddit threads, news mentions) lives on a small server that Countermark queries when needed. These sources are sources anyone can search. The server logs the listing URL or host identifier being queried so the response can be returned, and the log is retained for the time needed to debug bad responses (target: 30 days, capped at 90).
- There is no account, no signup, no telemetry in the extension at launch beyond Chrome Web Store’s built-in install count.
What Countermark promises not to do
- Not sell your email to anyone, ever. Not after a pivot, not after an acquisition, not under any circumstances. If the project ever changes hands, this promise transfers and is binding on the new owner.
- Not build a centralized dataset of Airbnb listings or hosts. The architecture is designed around the principle that no such dataset should exist anywhere Countermark controls.
- Not run advertising on the landing page, on the extension, or in any future surface.
- Not add tracking pixels, behavioral analytics, or third-party cookies to the landing page. (You can verify this in the page source.)
Contact
If you want your email removed from the signup list before launch, email timyjsong+countermark@gmail.com and I will delete it. The full launch email goes out exactly once. If you want to be removed from the list later, the launch email will include an unsubscribe link.
— Tim Song