Last updated: 23 September 2026
Sastro is made by ASGILAB and runs at sastro.app.
The short version. Your birth details, settings and closet stay in your browser on your device. The only personal information we hold is the email address you sign in and subscribe with. No analytics, no advertising, no tracking.
To work out where the planets were when you were born, Sastro asks for:
All of this is stored in your browser's storage on your device and is used there to calculate your chart. It is never uploaded to our servers.
To subscribe, you sign in with a one-time code sent to your email. We keep that email address, a sign-in session, and whether your subscription is active, so your purchase can follow you to another browser. We use your email only to send sign-in codes and to look up your subscription. We do not send marketing.
Sign-in emails are sent through Resend (privacy policy).
Payments are handled by Dodo Payments, who act as the merchant of record (privacy policy). Dodo collects the name, email, billing address and card or UPI details needed to take payment. We never see or store your payment details; Dodo tells us only that a subscription is active for your email.
Where Sastro shows a written daily read, it is produced by an AI model from Anthropic. We send only the computed facts for the day — such as which planet is in which sign and which hours are strongest — never your name, email, birth date or birth place.
The list of cities is bundled inside the app, so choosing your birth place does not contact any server. The data comes from GeoNames under the Creative Commons Attribution 4.0 licence.
Sastro does not connect to Instagram, TikTok, YouTube or any other platform. It cannot see your posts, followers, analytics or messages.
Our servers run on Cloudflare. To stop abuse, your IP address is used to rate-limit requests and is kept for no more than a couple of minutes for that purpose. We do not use cookies for tracking, and the app does not use your device's location.
There are none. No analytics, no advertising, no tracking pixels.
Clearing your browser's site data for sastro.app, or using "Start over" in Settings, removes everything stored on your device. To have your email and subscription record deleted from our side, email us at the address below. Payment records held by Dodo Payments are kept as the law requires.
Sastro is not directed at children. You must be 18 or over to subscribe.
Sastro is for guidance and entertainment. It makes no claim to predict what any platform will do with what you post, and offers no medical, psychological or financial advice.
If this policy changes, the date at the top will change with it.
Questions about privacy: thisisme035@gmail.com