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Kay Science Killerby Estopia Engineering

Privacy Policy

Last updated: 18 October 2026

On this page
  1. Introduction
  2. What we collect
  3. How it's used and shared
  4. On your device
  5. Permissions
  6. Keeping and deleting data
  7. Changes to this policy
  8. Contact

Introduction

This policy explains what the Estopia Science browser extension (also listed as Kay Science Killer), made by Estopia Engineering Ltd, collects when you use it, where that data goes and what you can do about it.

What we collect

  • Your Estopia account. When you sign in, the extension receives your username, profile picture and token balance from Estopia Identity, and a sign-in token for your account.
  • Questions. For each question it answers, the extension sends the question text and the site's question number to our API at api.estopia.net.
  • Corrections. When kayscience.com shows the right answer after a wrong one, the extension sends that question and answer to us, linked to your account.
  • Usage records. Each request is logged against your account with the time, whether it succeeded, the model used and how long it took, and tokens are deducted from your balance.

We do not collect your kayscience.com password, your browsing history or anything from other websites.

How it's used and shared

  • Answering questions. If we already hold an answer to a question, we return it. If not, we send the question text to Google's Gemini AI service to produce one. Google receives the question, not your account details.
  • Shared answers. Answers, including corrections sent by users, are stored with a short preview of the question and reused for everyone who uses the extension. A correction replaces an answer once enough different users have sent the same one, and our team can review them.
  • Billing and abuse. Usage records are used to charge tokens and to spot misuse.

We do not sell your data or use it for advertising.

On your device

Your sign-in tokens and basic account details are kept in the browser's extension storage. Signing out from the extension's popup, or removing the extension, deletes them.

Permissions

  • Access to www.kayscience.com: to read the questions on the page and fill in answers.
  • Access to api.estopia.net: to sign you in, check your balance and get answers.
  • Storage: to keep you signed in.
  • Identity: to open the Estopia sign-in window and receive your sign-in token.

Keeping and deleting data

We keep your account, usage records and corrections while your Estopia account is open. You can ask us for a copy of your data, or to delete it, by emailing [email protected]. Shared answers hold no account details, so they stay after an account is deleted.

Changes to this policy

We will post any changes on this page and update the date at the top.

Contact

Questions about this policy: [email protected].