Privacy Policy

Last updated: September 2026

WetBulbTracker LLC, a Missouri limited liability company ("WetBulbTracker", "we", "us"), is the controller of personal information collected through WetBulbTracker.com.

This Privacy Policy explains what information WetBulbTracker.com (the "Service") collects, how it is used, and the choices you have. By using the Service, you agree to the practices described here. We aim to collect as little as possible.

1. Information you provide

• Account information. If you create an account, we collect your email address. If you sign in with Google, we receive the basic profile information Google shares for sign-in (such as your email address and name). We do not receive or store your Google password.
• Saved locations and preferences. If you save places or change settings (such as units or theme), we store those so they sync across your devices.
• Personalization profile (optional). If you use the "safe for me" feature, the heat-risk factors you choose are stored to tailor your personal-risk read. These may include a broad, optional self-report of health sensitivities (such as a heart or respiratory condition, pregnancy, or medication use). You choose whether to provide any of this; it is stored on your device and synced to your account only if you sign in; it is used solely to personalize your heat-risk read; it is never sold or used for advertising; and you can change or clear it at any time. We ask before collecting any of it. The first time you open the personalization controls you are told what the data is for and asked to agree; nothing is collected until you do, and the date of your agreement is recorded. You can withdraw at any time from the same place — withdrawing deletes the profile from this device and from your account, not just the agreement.
• Heat alerts (optional). If you turn on alerts for a saved place, your browser creates a push subscription for that device and we store it against your account so we can deliver the notification. It is a delivery address for that browser, not a tracking identifier: we do not use it to build a profile, and it is deleted when you turn alerts off, sign out of that device, or delete your account. Alert rules also record the threshold you chose and when we last notified you, so we do not send the same warning twice.
• Communications. If you email us, we keep your message and contact details to respond.

2. Information collected automatically

• Location you look up. When you search for or tap a location, those coordinates are sent to our servers and to our weather data providers (see §4) to return conditions for that point.
• Device location (optional). If you use the "locate me" feature, your browser asks your permission and, if granted, shares your device's approximate location with the Service to center the map. You can decline, and you can revoke this permission in your browser at any time.
• Usage and analytics. We use Vercel Web Analytics to understand aggregate usage (such as page views, general region, device and browser type, and which features are used). It is cookieless, does not track you across other websites, and runs for every visitor. Google Analytics runs only for visitors outside the EU, EEA, UK and Switzerland. Where it runs it sets its own cookies; where it does not, no Google Analytics script is loaded at all. That decision is made on our server from the country your request arrives from, and anything we cannot determine is treated as inside that region. In every region, the location parameters in the address bar and the token in a shared-document link are stripped before any analytics provider sees the page address. Your personalization profile is never sent to analytics — not the values, and not which fields you filled in. This is enforced by an automated check in our source code, not only by policy.
• Technical logs. Our hosting and infrastructure providers process standard request data (such as IP address and user agent) to operate the Service and guard against abuse, including rate limiting.

3. Cookies and local storage

• Local storage. Your preferences (units, theme, selected metric) are stored in your browser's local storage so the app remembers them. Clearing your browser data removes them.
• Authentication. If you sign in, our authentication provider (Supabase) stores a session token in your browser so you stay signed in.
• Analytics cookies, outside the EU/EEA/UK and Switzerland only. Our Vercel analytics is cookieless everywhere. Google Analytics, which does set its own cookies, is loaded only for visitors outside those regions, and never for anyone who has opted out of analytics. We run no advertising or tracking pixels anywhere. Apart from Google Analytics where it applies, the only cookie this site sets is the sign-in session above, and only if you choose to sign in. You can block or delete cookies in your browser settings; signing in will not work without the session cookie.

4. Third-party services

We rely on reputable third parties to operate the Service. Your information is handled under their respective privacy policies:

• Weather and map data — Open-Meteo, ERA5 reanalysis, the U.S. National Weather Service, and RainViewer. We send the coordinates you look up to retrieve conditions; we do not send these providers your identity.
• Place names — BigDataCloud, to turn a coordinate you tap on the map into a place name. We send that coordinate and nothing else — no identity, no account reference.
• Map tiles — CARTO, which serves the map background. Your browser requests tiles from them directly, so they see your IP address and which part of the map you are looking at, the way any image on any website is fetched.
• Hosting and analytics — Vercel (hosting, and cookieless Web Analytics). Analytics records the page you were on, with the location parameters removed first: a page you open at a specific coordinate is counted as the page, never as the place.
• Sign-in with Google — Google, only if you choose that sign-in method. We no longer use Google for analytics.
• Authentication and database — Supabase (account sign-in, saved locations, and preferences storage).
• Payments — Stripe, if you subscribe. Card details go directly to Stripe and never reach our servers; we store only your Stripe customer reference and what your subscription entitles you to.
• Plain-language briefs — Anthropic (Claude). When the app writes a short brief about your conditions, we send that location's coordinates and its current and forecast conditions. If you have turned on personalization, we also send a single °C-equivalent risk offset and the general factor phrases behind it — for example "health sensitivities" or "not yet acclimatized to heat". We never send a named health condition, your name, your email, or any account identifier, and personalization is sent only for the brief about your own location: never for a city or regional outlook, and never for a report.

A brief for a report sends something different: no coordinates and no raw conditions, but the label you gave the place, the dates the report covers, the audiences and exposure you chose, and the report's computed figures. The label is text you typed, so if you name a place after a person, that name is what gets sent — call it something else if you would rather it were not. This applies to reports you build on the site and to reports emailed to you on a schedule.

• Email delivery — Resend, for mail we send you: the sign-in and confirmation messages, and any scheduled report you asked for. We send your email address, the message itself, and the place labels and figures inside it. Heat alerts do not go through this — they are browser push notifications and reach your device without an email provider.
• Your organization's logo (Pro) — if you upload a logo for Studio documents, the image file is stored in our own private storage, readable only by your account, and appears on the documents you produce. Nothing about it is sent to a third party, and removing it deletes the file.
• Address lookup (Studio) — the U.S. Census Bureau geocoder, if you look up a street address for a Studio site. The address is sent from our servers, not your browser, and we do not log or store it — only the coordinates you then choose to save.

We do not sell your personal information.

5. How we use information

We use the information above to:

• Provide and personalize the Service (return conditions for your locations, sync your saved places and settings, and — if you opt in — tailor your "safe for me" heat-risk read);
• Operate, secure, and improve the Service (analytics, debugging, abuse prevention); and
• Communicate with you when you contact us.

6. Data retention

We keep account information and saved data for as long as your account is active. Deleting your account removes all of it at once (see §8 and Delete your account).

A few things outlive the account, and we would rather name them than let you discover them. Our payment processor retains invoice and payment records for as long as tax and accounting law requires a business to keep them. Analytics and technical logs are retained for a limited period under our providers' standard settings; neither is linked to your account.

One of them is your email address, and only in one circumstance: if mail to you ever bounced, or you marked our mail as spam, that address stays on a do-not-email list. It is kept so that we cannot start mailing you again by mistake — it stops mail rather than enabling any — and it is the address on its own, not linked to an account that no longer exists. Ask us and we will remove it. Nothing else about you survives: the record of what we sent you outlives the account, but your address is removed from it when the account goes.

7. Aggregated and de-identified data

We may compute and retain aggregated or de-identified information — for example, comparisons between our heat-stress estimates and the National Weather Service's own published WBGT (itself a model), or statistics about model accuracy — to validate, improve, and develop the Service and its underlying methods. This information does not identify you and is not personal information.

8. Your choices and rights

• Delete your account yourself. Sign in, open Account, and choose Delete my account. It is immediate and irreversible, it cancels any Plus or Pro subscription, and it removes your profile, saved locations, alert rules and push subscriptions. Full detail, including what we are required to keep, is on Delete your account.
• Delete only part of it. You can remove a saved location, delete a heat alert, or clear your personal profile — including health sensitivities — without deleting your account.
• Download a copy. Export your data from Account at any time.
• If you cannot sign in. Email us from the account's own address and we will delete it for you.
• Location permission. You control device-location access through your browser's permission settings.
• Analytics. Our analytics is cookieless and aggregate, and is never linked to your account. You can still switch it off: open Settings and set Usage analytics to Off. That stops page counts and in-app events alike. If your browser sends Global Privacy Control or Do Not Track, it is off already unless you turn it on.

Depending on where you live, you may have additional rights (such as under the GDPR or CCPA). We will honor applicable rights requests; contact us to exercise them.

9. Children's privacy

The Service is not directed to children under 13 (or the equivalent minimum age in your jurisdiction), and we do not knowingly collect their personal information. If you believe a child has provided us information, please contact us and we will delete it.

10. Security

We use industry-standard measures and reputable providers to protect your information. No method of transmission or storage is completely secure, however, and we cannot guarantee absolute security.

11. International users

The Service is operated from the United States and relies on providers that may process data in the United States and other countries. By using the Service, you understand your information may be processed in those locations.

12. Changes

We may update this Privacy Policy from time to time. Material changes will be reflected by updating the "Last updated" date above. Your continued use of the Service after changes take effect constitutes acceptance of the revised policy.

13. Contact

Questions or requests about this Privacy Policy? Contact us at info@wetbulbtracker.com.