Privacy policy

Effective 11 November 2026. Black Datum is operated by Daniel Greenwalt (“we”). Contact: support@blackdatum.net.

What Black Datum is

Black Datum is a browser extension with a small Windows program and an online service. It keeps your project's approved information (such as goals, rules, decisions and current state) and adds it to messages you send in ChatGPT conversations that you connect to a project. Changes ChatGPT suggests come back to Black Datum, where your approval settings decide whether they are saved or wait for you. Black Datum is in private development and is used by invited people only.

Information we collect and why

Your account

• Email address and password. Used to create and sign in to your account. When you sign in or create an account, your password is sent to our sign-in provider (Supabase), which stores it in protected (hashed) form. Black Datum itself does not store your password.
• Account identifier and sign-in sessions. Used to keep you signed in and to make sure only you can see and change your projects.

Your projects

• Project information you save: project names and purposes, the records you keep (goals, rules, procedures, decisions, current state, issues, reference facts), sources you import, and your approval settings.
• Changes ChatGPT suggests: the proposed changes and their short summaries, your review decisions (approve, edit, reject, keep for later), and a limited history so you can undo a saved change.
• Operational records: identifiers of projects and connected chats, message fingerprints (one-way codes, not the text), and processing receipts that show whether a report was saved, is waiting for approval or was rejected. Some of these expire automatically; for example, details of a confirmed decision are reduced to minimal identifiers after seven days.

On your computer

• Black Datum for Windows keeps your sign-in for this computer, your Google Drive permission and limited-access keys in storage encrypted for your Windows account. These stay on your computer.
• The browser extension stores your choices (which chat uses which project) and short-lived working data in the browser's own extension storage.

This website and email to us

• Visiting this website. The site has no sign-in, forms, scripts, cookies or analytics. Our hosting provider, Cloudflare, necessarily handles technical information such as your IP address and browser type to deliver the pages and protect them from abuse.
• Writing to us. If you email support@blackdatum.net, we receive your email address and your message and use them to reply. Cloudflare receives email for our domain and forwards it to our mailbox, which Google hosts. We keep correspondence for as long as it is needed to answer you and keep a record of the request.

What we do not collect

• The text of what you type in ChatGPT or ChatGPT's replies (other than the suggested changes ChatGPT writes into Black Datum's report files, described below).
• Your browsing history. The extension works only on ChatGPT pages and its own pages.
• Analytics, advertising identifiers or tracking cookies. This website sets no cookies.

Google user data

If you connect Google Drive, you grant Black Datum one Google permission: access to files that Black Datum creates or that you open with it (Google calls this drive.file). Black Datum asks for no other Google permission.

• What we access: the report files Black Datum creates in your Drive for your connected chats, and an identifier of the Google account you authorized (so Black Datum keeps using the same account). We do not access, list or read any other file in your Drive.
• How we use it: ChatGPT, through your own ChatGPT connection to Google Drive, writes the changes it suggests into those report files. Black Datum for Windows reads them and sends the suggested changes to our service, where your approval settings are applied. When a report file is finished with, Black Datum may move it to your Google Drive trash. Report files that remain are yours to keep or delete.
• Where it is stored: your Google permission is stored only on your computer, encrypted for your Windows account. The suggested changes read from report files are stored with your project information on our service, as described above.
• Sharing: we do not share Google user data with anyone except our service provider that hosts our service on our behalf, or when required by law. We do not sell it, use it for advertising, or use it to develop or train AI models. No person at Black Datum reads it unless you ask us to (for example for support), it is needed for security, or the law requires it.

Black Datum's use and transfer of information received from Google APIs to any other app will adhere to the Google API Services User Data Policy, including the Limited Use requirements.

You can remove Black Datum's access at any time from your Google Account's third-party connections page. Report files already in your Drive stay there until you delete them.

ChatGPT

When you send a message in a chat you connected to a project, Black Datum adds your project's current approved information to that message. That information is then part of your ChatGPT conversation and is handled by OpenAI under its own terms and privacy policy. If you also allow ChatGPT to look up your project's saved records, ChatGPT can read those records (but cannot change them). Black Datum does not read ChatGPT's replies on the page.

Who processes your information

• Supabase hosts our sign-in, database and online service, and sends account emails (such as confirmation and password reset), on our behalf.
• Google stores the report files in your own Google Drive, under your Google account.
• OpenAI receives what you send in ChatGPT, including project information Black Datum adds, under your own relationship with OpenAI.
• Cloudflare hosts this website and our domain, and forwards email sent to support@blackdatum.net to our mailbox (hosted by Google), on our behalf.

We do not sell or rent personal information and do not share it with anyone else, except if required by law or to protect the security of the service.

How long we keep information

We keep your account and project information while your account exists, so it stays available to you. Some operational records expire on their own, as described above. When information is deleted, copies in our hosting provider's routine backups are removed as those backups expire.

Your choices and rights

• Disconnect a chat or sign out at any time in the Black Datum button. Signing out on a computer pauses Black Datum there.
• Remove Google Drive access from your Google Account (link above).
• Ask for a copy, correction or deletion of your account and project information by writing to support@blackdatum.net from your account's email address. We will complete deletion requests within 30 days and tell you when it is done.
• Remove Black Datum from your computer by uninstalling the extension and the Windows program. Uninstalling does not delete your online account; ask us to delete it.

Security

Information travels over encrypted connections (HTTPS). Sign-in and Google permissions on your computer are encrypted for your Windows account. When you sign in, your password is passed straight to our sign-in provider and is never stored by Black Datum, and the browser extension never holds your Google permission. No system is perfectly secure; please use a strong, unique password and keep your computer protected.

Children

Black Datum is not intended for anyone under 18, and we do not knowingly collect information from them.

Changes to this policy

If we change this policy, we will update the effective date above and, for significant changes, tell people using Black Datum before the change takes effect.

Contact

Daniel Greenwalt · support@blackdatum.net