This explains what System Design Atlas collects, why, and the choices you have. We collect only what we need to run the site.
What we collect
- Account: your name, email address and profile picture from the sign-in method you choose (GitHub, Google or an email link). We never see your GitHub or Google password.
- Your activity: lesson progress, quiz results, points, saved designs, bookmarks, contributions and posts you create.
- Security records: where you are currently signed in (device and IP address, for the sessions you have open), and a short-lived record of failed or unusual sign-in attempts. Ordinary successful sign-ins are not logged.
- Payments: if you subscribe, payment is handled by our payment processor (Razorpay), so you can pay with UPI, cards or net banking. We receive your plan, payment status, amounts and invoice details, never your card number or UPI details.
- Messages: what you send through the contact form.
- Site analytics: after you allow analytics, Google Analytics measures visits to reviewed public sections using generic page labels. We exclude private and account pages and omit URL queries, fragments, real page titles and dynamic identifiers from our events. Google Analytics and Google Tag Manager load only after your approval on a reviewed public page. Google also receives network and device information. Google Signals and advertising personalization are disabled.
How we use it
- To run your account, sync your progress across devices and show your work.
- To process payments, send receipts and answer support requests.
- To keep the service secure and fix problems.
- To understand which pages people visit and improve the site.
- To send the weekly digest only if you opted in; you can opt out in Settings or from any email.
Who we share it with
Only the services that help us operate: our hosting provider, our payment processor, the email service that delivers our messages, Google Analytics for site analytics, and GitHub or Google when you use them to sign in. We do not sell your data. See how Google uses information from sites that use its services.
Cookies
We use essential cookies to keep you signed in and remember your theme. A preference cookie remembers your analytics choice for 180 days. If you allow analytics, Google Analytics uses first-party analytics cookies to distinguish visits and measure engagement. We do not use advertising cookies.
Your choices
- Download your data from your profile or at
/api/me/exportwhile signed in. - Delete your account by contacting us; we remove your account and what belongs to it. Invoices are kept without a link to you where the law requires it.
- Correct your details in Settings.
- Analytics: use Cookie preferences in the footer to allow or reject analytics at any time. Rejecting removes analytics cookies. Pages with loaded tags reload to stop them once your preference is saved. If your browser blocks saving it, your choice applies until this page is reloaded. You can also use Google's Analytics opt-out browser add-on.
Retention
We keep account data while your account exists. Records of failed or unusual sign-ins are deleted after 2 days. A session's device and address are removed when the session ends. Backups roll off within about 30 days. Analytics data is retained separately according to our Google Analytics property settings.
Questions about this page: [email protected] (forcsguy.com).