Privacy Policy · TradeCorner
This Privacy Policy explains what information the TradeCorner browser extension ("the extension", "we", "us") collects, why, and the choices you have. We designed TradeCorner to keep as much of your data as possible on your own device, and to collect the minimum needed to provide optional accounts and Pro features.
1. Summary
- You can use TradeCorner without an account. In that mode we collect no personal data on our servers.
- Your watchlist, settings, notes, trade journal, chart drawings and local alerts are stored on your device. We never receive them.
- If you sign in, we process your email address to authenticate you and to remember your Pro status.
- We do not sell your data, do not use advertising, and do not use tracking or analytics cookies.
2. What we collect and why
a) Data stored only on your device (not sent to us)
Held in your browser's local and synced storage. We have no access to it. It includes your watchlist and categories, app settings, your portfolio positions, chart drawings, the trade journal, your notes, imported alert sounds, and price alerts you create. If you are signed in to your browser, some of this may be synchronised across your own devices by your browser vendor (e.g. Google Chrome Sync), governed by that vendor's privacy policy, not ours.
b) Data we process on our servers (only if you sign in / use Pro)
| Data | Purpose | Legal basis (GDPR) |
|---|---|---|
| Email address | Sign-in via one-time email code; account identification | Performance of a contract (providing the account you requested) |
| Pro entitlement (whether you are Pro, plan, dates) | Unlock and maintain Pro features you paid for | Performance of a contract |
| 24/7 email alerts you create (coin, condition, target, your email) | To check your alerts in the cloud and email you when they trigger, even with the browser closed (Pro feature you enable) | Consent (you switch this on) / performance of a contract |
| Feedback you submit (message text) | To read and act on your feedback | Consent (you choose to send it) |
We do not collect your name, location, browsing history, or the content of the web pages you visit. The floating price overlay runs locally in the page and sends nothing about that page to us.
c) Payment data
Payments are handled entirely by our payment processor, Lemon Squeezy. We never receive or store your card details. We only receive a confirmation that a payment succeeded, linked to your account, so we can activate Pro.
3. Third-party services (processors)
TradeCorner relies on the following services. Personal data (your email) is shared only with the first three, and only when you sign in or use the related feature:
| Service | Role | Data involved |
|---|---|---|
| Supabase | Authentication & database (accounts, Pro status, email alerts) | Email, Pro status, alert settings |
| Resend | Sends the sign-in code and alert emails | Email address |
| Lemon Squeezy | Payment processing for Pro | Handled by them; we receive only payment status |
| Binance, CoinGecko, exchangerate-api, alternative.me | Public market data (prices, charts, FX, Fear & Greed) | No personal data. Requests carry no account information |
Market-data requests are made directly from your browser to those providers to show live prices; they are not tied to your identity.
4. Data retention
- Account & Pro status: kept while your account exists. Delete your account (see §6) to remove it.
- Email alerts: kept until you delete the alert or your account.
- Feedback: kept as long as needed to address it, then may be deleted.
- On-device data: stays until you delete it or uninstall the extension. Uninstalling clears local data from that device.
5. Where your data is processed
Our processors may store and process data on servers located inside or outside the European Economic Area (EEA). Where data leaves the EEA, it is protected by appropriate safeguards such as the processor's Standard Contractual Clauses. See the privacy policies of Supabase, Resend and Lemon Squeezy.
6. Your rights
If you are in the EEA/UK, under the GDPR you have the right to access, correct, delete, restrict, or port your personal data, and to withdraw consent at any time. To exercise any of these, including deleting your account and all associated data, email us at [email protected] from your account email address and we will action it within 30 days. You may also lodge a complaint with your local data protection authority (in Spain, the AEPD).
7. Cookies & tracking
The extension does not use advertising or analytics cookies and does not track your activity across websites. A sign-in session token is stored locally on your device solely to keep you logged in; it is not used for tracking.
8. Children
TradeCorner is not directed at children under 16 and we do not knowingly collect their data. Cryptocurrency information is provided for general informational purposes and is not financial advice.
9. Security
Access to your account data is protected by row-level security so that each account can only read its own records. Sign-in uses one-time email codes rather than reusable passwords. No method of transmission or storage is 100% secure, but we take reasonable measures to protect your information.
10. Changes to this policy
We may update this policy as the extension evolves. Material changes will be reflected here with a new "Last updated" date. Continued use after an update constitutes acceptance of the revised policy.
11. Contact
Questions about this policy or your data: [email protected].