This page explains what personal information Materials 101 ("we", "the site") collects from you, why we collect it, where it is stored, and the choices you have. The site is operated by Teerapong Poltue from Bangkok, Thailand, as a personal educational project. If anything below is unclear, email us at contact@tpoltue.com.
1. Who this policy applies to
This policy covers anyone who visits the Materials 101 site, creates an account, signs in with Google, purchases the Pro upgrade, or submits a problem report through the in-page form.
2. What we collect
2.1 Account information
- Email address — required to create an account and to receive verification, password-reset, and email-change confirmation messages.
- Display name and profile photo — only if you sign in with Google. These are provided to us by Google after you consent on the Google sign-in screen.
- Account creation date and verification status — recorded automatically when you sign up.
2.2 Payment information (Pro upgrade only)
- We do not see or store your card or PromptPay details. Payments are processed by Stripe, which handles all card and payment-method data on its own infrastructure.
- We receive and store a Stripe customer ID, payment-intent ID, and the fact that your account has been upgraded to Pro — so we can grant access to Pro content on the site.
2.3 Problem reports
- When you click Report a problem and submit the form, we receive the topic and message you wrote, the URL of the page you were on, and — if you were signed in at the time — your email address and user ID, so we can reply to you.
- If you submit a report while signed out, no identifying information is attached.
2.4 Technical data
- Standard server logs (request timestamps, error traces) are recorded by our infrastructure providers to keep the site running and secure. We do not use cookies or local storage for advertising or analytics.
- Firebase Authentication stores a session token in your browser so you stay signed in. You can clear it at any time by signing out or clearing your browser storage.
3. How we use your information
We use your information to create and authenticate your account, to send you transactional email (verification, password reset, email-change confirmation, and replies to problem reports), to process your Pro upgrade and unlock Pro content, to respond to bug reports and feedback, and to keep the site secure and prevent abuse.
We do not sell your personal information, use it for advertising, or share it with third parties for marketing purposes.
4. Who we share data with
We rely on a small number of vetted service providers to operate the site. Each one only receives the data needed for its specific job.
Firebase / Google Cloud
Authentication, database storage, and cloud functions. Data is stored in the Singapore region (asia-southeast1).
View Firebase privacy →
Stripe
Payment processing for the Pro upgrade. We never see or store card or PromptPay details ourselves.
View Stripe privacy →
Resend
Delivery of transactional email — verification, password reset, and problem-report forwarding.
View Resend privacy →
GitHub Pages
Static hosting for the public pages of the site. Receives standard server-log data (IP address, user-agent) when you visit.
View GitHub privacy →
5. Where your data is stored
Account and Pro-entitlement data is stored in Firestore in Google Cloud's Singapore region. Email delivery records are stored briefly by Resend in line with their retention policy. Payment records are held by Stripe under their own retention rules. The public site files are served from GitHub Pages.
6. How long we keep it
- Account data is kept as long as your account exists.
- Pro-purchase records are kept indefinitely so we can honour your Pro access and resolve any payment dispute.
- Problem-report emails are retained in our inbox so we can follow up; you can ask us to delete a specific report at any time.
- If you delete your account, we will remove your account record and Pro entitlement within 30 days, except where we are legally required to retain payment records.
7. Your rights
You can ask us to access the personal information we hold about you, correct anything that is wrong (you can also change your email yourself from the account page), delete your account and associated data, or withdraw consent for any use of your data beyond what is legally required.
To exercise any of these rights, email contact@tpoltue.com from the address associated with your account. We will respond within 30 days.
8. Children
Materials 101 is intended for university and graduate-level students. We do not knowingly collect data from anyone under 13. If you believe a child has created an account, contact us and we will delete it.
9. Security
Account passwords are hashed by Firebase Authentication and never visible to us. Payments are encrypted in transit and processed entirely on Stripe's infrastructure. The site is served exclusively over HTTPS. No system is perfectly secure — if you suspect your account has been compromised, contact us immediately.
10. Changes to this policy
If we change how we collect or use data, we will update this page and revise the "Last updated" date at the top. For material changes (e.g., a new third-party provider), we will also email signed-in users at least 14 days before the change takes effect.
11. Contact
Questions, requests, or concerns: contact@tpoltue.com.