What we collect, what we don't.

Waitlist email. If you sign up at /waitlist, we store the email you provide along with the time of signup, optional UTM tracking parameters from the URL, and your browser user-agent. This email is used only to send the launch link on May 28, 2026, and one optional follow-up if you've actively engaged with the product.

Birth information for readings.When you submit birth date and time on /twin or /living, the values are sent to our server, used to compute your chart, and discarded after the request completes. Birth info is not stored by default. The URL on the result page contains the values so you can share or bookmark, but we don't log those URLs server-side.

Anonymous request logs. Like any service running on Vercel and Supabase, we have access to standard request logs (timestamps, IP addresses, response codes) for the purpose of debugging and abuse mitigation. These are kept for 30 days.

We don't set marketing cookies. We don't track across sessions or sites. We don't sell or share your data with ad networks.

We don't collect names, addresses, phone numbers, or payment data. (When the paid Living Saju tier launches, payment handling will be done by Stripe, who collects card data directly — we never see it.)

Vercel hosts the website. Standard server logs.

Supabase stores the waitlist table and the self-translated classics corpus. Located in US East (Virginia).

Railway hosts the Saju computation engine. Birth info is sent here for chart calculation; not stored.

Anthropic Claude generates readings. Chart facts (Day Master, pillars, five elements) and retrieved classical excerpts are sent to Anthropic; per their policy, this data is not used to train their models. See Anthropic privacy policy.

Google Gemini generates embeddings for search. Same data-handling — query strings sent for embedding only, not used for training.

Removal. If you want your waitlist email removed, email bchanghyeok@gmail.com and we'll delete it from the table within 7 days. No confirmation dance.

Access. Email the same address asking what we have on file for your address. Reply within 7 days.

Saju AI Global is not directed at children under 13. If you are a parent and discover that your child has signed up, email us and we'll remove the entry.

If this policy changes meaningfully, we update the ‘last updated’ date at the top and post a brief change note. We won't silently broaden the data we collect.