Privacy Policy
Effective 13 July 2026. Last updated 13 July 2026.
This page explains what happens to the information you give us when you join the DeltaBook early-access list. DeltaBook is analytics software for building and testing forecasting models. It is not a wagering product, it takes no bets, and it quotes no prices.
What we collect
When you join the early-access list, we collect:
- Your email address. You give it to us so we can tell you when DeltaBook is ready.
- What you told us you want to forecast, if you chose “something else” and typed an answer. This is optional, and it only helps us understand what people want us to build.
That is all. We do not ask for your name, your location, or any payment details to join the list.
Why we collect it
We use your email for one purpose: to send you a message when DeltaBook is ready to use, and the occasional update about early access. That is the only reason you are on this list.
What we do not do
- We do not sell your email or your answer to anyone.
- We do not share them with advertisers, and we run no ad tracking on this page.
- We do not add you to unrelated mailing lists.
How we store it
Your information is stored securely with our infrastructure provider, Supabase, and is accessible only to the DeltaBook team. We keep it until we launch and you have an account, or until you ask us to delete it - whichever comes first.
Your choices
- Unsubscribe from any email we send using the link in that email.
- Delete your data at any time by writing to hello@zhiji.io. We will remove your email and any answer you gave, and confirm when it is done.
Cookies and analytics
This page does not set advertising or cross-site tracking cookies. Any readouts you see on the page (such as the status line at the bottom) are generated in your own browser and are not sent to us or to anyone else. If we later add basic, privacy-respecting analytics to understand how many people visit, we will update this page to say so before we do.
Contact
Questions about your information: hello@zhiji.io.
Changes to this policy
If we change what we collect or how we use it, we will update this page and change the “last updated” date above. For anyone on the early-access list, a material change means a heads-up by email first.