Privacy Policy

Data We Collect

Account data: email address, username, password hash, profile details you choose to provide, authentication events, and account settings.

Product data: saved charts, saved fractals, collections, shared views, feedback, search settings, and chart workspace preferences.

Subscription data: subscription status, plan, billing period, and billing-provider identifiers. On the web, payments are processed by Stripe; in the Android app, subscriptions are purchased and processed through Google Play billing. Full card details are handled by the payment provider and are not stored by Chart-echo.

Mobile app data: when you enable pattern alerts in the Android app, we store a device push notification token (provided by Expo and Google Firebase Cloud Messaging) so we can deliver alerts to your device. You can turn this off in your device notification settings.

Technical data: server logs, device/browser details, approximate location derived from IP address, security events, and diagnostics needed to keep the service reliable.

Local storage data: authentication tokens, stored user information, and preferences are kept on your device - in your browser on the web, and in the operating system’s secure storage and local app storage in the Android app - so the app can keep you signed in and remember your settings.

How We Use Data

To provide accounts, authentication, subscriptions, saved workspaces, chart sharing, feedback, support, security, fraud prevention, and service maintenance.

To process payments and manage subscriptions through Stripe (web) or Google Play billing (Android app).

To deliver pattern alerts and account notices as push notifications to your device when you enable them in the Android app.

To improve reliability, troubleshoot bugs, protect the service, and understand whether core product features are working.

To send service messages such as password reset emails, account notices, subscription notices, and important product or legal updates.

Legal Bases

Contract: to provide the account, subscription, saved chart, and charting services you request.

Legitimate interests: to secure the service, prevent abuse, maintain reliability, respond to feedback, and improve core product functionality.

Legal obligation: to keep records required for tax, accounting, dispute, or regulatory reasons.

Consent: for optional marketing, analytics, advertising, or non-essential storage if those features are introduced.

Sharing And Processors

Data may be processed by hosting, database, email, payment, error-monitoring, and support providers needed to operate the service.

Stripe processes payments and may independently set cookies or collect payment data on Stripe-hosted checkout and billing pages.

In the Android app, Google Play processes subscription purchases under Google’s terms, and Expo and Google Firebase Cloud Messaging process device push tokens to deliver notifications you have enabled.

With your consent, advertising and analytics partners (Google and Meta) receive limited information through their tags or pixels to measure advertising performance and conversions. These load only after you accept marketing cookies and can be turned off via "Cookie settings".

Public shared chart links may be visible to anyone with the link and may generate preview metadata for social platforms.

Retention And Deletion

Account and workspace data is kept while your account is active or as needed to provide the service.

You can delete your account from account settings. Some records may be retained where required for legal, tax, security, backup, or dispute-resolution purposes.

Password reset tokens and session records are time-limited or invalidated when no longer needed.

Your Rights

Depending on where you live, you may have rights to access, correct, delete, export, restrict, or object to processing of your personal data.

You may also have rights to opt out of sale, sharing, or targeted advertising. Chart-echo uses advertising and analytics tools (Google Ads and the Meta Pixel) that are loaded only after you consent through our cookie banner; you can withdraw consent at any time via "Cookie settings" in the footer.

Use the in-product feedback or support channel to make a privacy request. You may also complain to your local data protection authority.

Security

Chart-echo uses authentication, hashed passwords, access controls, and operational safeguards to protect data.

No online service is perfectly secure. Keep your password private and use a unique password for this account.

Children

Chart-echo is not intended for children. Do not use the service if you are under the age required to create an online account in your country.