DeikonDeikon

Privacy Policy

Last updated: 1 May 2026

This Privacy Policy explains how Deikon processes personal data when you use the Deikon website, web app, and related web services.

1. Controller

The controller responsible for processing personal data is:

Philip Dimitris Doukakis ELTA ACHILLEIOY POST BOX 57 49084, CORFU GREECE Email: support@deikon.app

2. What data we process

Depending on how you use Deikon on the web, we may process:

  • account information, such as your email address;
  • authentication and sign-in information, including Google Sign-In information if offered and chosen by you;
  • account profile information, such as display name and preferred language where provided;
  • browser, device, and session-related information needed for security and access management;
  • project data, scenarios, estimate inputs, saved reports, exports, and related content you create or store;
  • payment, subscription, entitlement, billing, and transaction-related records connected with web purchases and subscriptions;
  • technical and operational information needed to provide, secure, and maintain the Service;
  • communications you send to us, including support and privacy requests.

3. Why we process your data

We process personal data for the following purposes:

  • to create and manage user accounts;
  • to authenticate users and keep accounts secure;
  • to manage browser sessions, active sign-ins, and access controls;
  • to store and sync projects, scenarios, reports, and related web app content;
  • to provide core website and web app functionality;
  • to process checkout, subscriptions, one-time purchases, billing administration, and related entitlements;
  • to respond to support, privacy, and account deletion requests;
  • to comply with legal obligations;
  • to protect the security, integrity, and availability of the Service.

4. Legal bases

Depending on the context, we process personal data on one or more of the following legal bases:

  • performance of a contract or steps taken at your request before entering into a contract;
  • compliance with legal obligations;
  • our legitimate interests in operating, securing, administering, and improving the Service, where those interests are not overridden by your rights.

5. Cookies and browser storage

Deikon currently uses only necessary or functional cookies and browser storage to provide and operate the website and web app.

These technologies may be used for authenticated sessions, authentication token handling, security, session continuity, session and sign-in identifiers, guest or local project persistence, active project state, onboarding state, purchase or export flow continuity, and similar functional app preferences.

Deikon does not currently use advertising cookies, marketing pixels, third-party analytics cookies, or cross-app tracking technologies on the web service.

Because Deikon currently uses only necessary or functional storage, Deikon does not currently display a separate cookie consent banner.

If Deikon introduces analytics, advertising, marketing pixels, or other non-essential tracking technologies in the future, we will update this Privacy Policy and request consent where legally required.

6. Authentication and active sign-ins

When relevant to account security and access control, Deikon may process session and sign-in-related information such as:

  • session identifiers;
  • active sign-in identifiers;
  • session expiry or revocation status;
  • browser, app, or sign-in metadata;
  • platform or browser-related technical information.

7. Google Sign-In

If offered, you may choose to sign in with Google.

If you use Google Sign-In, Deikon may receive basic account information necessary to authenticate your account and create or link your user profile, such as your name, email address, and a Google account identifier.

8. Payments and billing

For the web app, Deikon uses Stripe for checkout, payment processing, subscriptions, billing administration, one-time purchases, billing status, purchase reconciliation, entitlements, fraud prevention, customer support, and legal or accounting obligations.

Deikon may receive and store payment-related records such as subscription status, plan information, purchase records, billing identifiers, entitlement status, and transaction-related metadata as needed to operate paid web features.

Deikon does not store full payment card details unless explicitly stated otherwise.

9. Service providers and data recipients

We may share personal data with service providers that help us operate Deikon.

Supabase provides hosting, backend infrastructure, authentication, database, storage, and related technical services for the web service.

Stripe provides web checkout, payment processing, subscriptions, billing administration, one-time purchases, billing status, purchase reconciliation, entitlements, fraud prevention, customer support, and related legal or accounting support.

Google Sign-In is involved only if it is offered and you choose to use it.

10. No sale of personal data

Deikon does not currently sell personal data.

If our data practices materially change in the future, we will update this Privacy Policy as required.

11. International transfers

If personal data is transferred outside the European Economic Area, we will take appropriate steps required by applicable law to ensure an adequate level of protection.

12. Data retention

We keep personal data only for as long as necessary for the purposes described in this Privacy Policy.

This may include keeping data while your account remains active, while needed to provide the Service, while required for billing, accounting, tax, legal, security, fraud-prevention, or dispute-resolution purposes, and while necessary to enforce agreements or protect the Service.

When personal data is no longer needed, we delete it or anonymize it where appropriate.

13. Account and data deletion

If you are logged in, you can delete your Deikon account from the web app Settings using the Delete account button.

If you cannot access the web app, email support@deikon.app from the email address linked to your Deikon account. Suggested subject: "Delete my Deikon account".

When a valid deletion request is processed, Deikon by Philip Dimitris Doukakis deletes or anonymizes the app account and associated app data where technically and legally possible. This includes account and profile data, saved projects, scenarios, estimates, and app-related account data.

Some records may be retained where required for legal, tax, accounting, fraud-prevention, security, payment, or compliance reasons. Payment providers such as Google Play or Stripe may retain records under their own legal obligations and privacy policies.

We will process valid deletion requests as soon as reasonably possible, unless retention is required by law or legitimate compliance reasons.

14. Your rights

Under applicable data protection law, you may have rights to request access to your personal data, correction of inaccurate data, deletion, restriction of processing, objection to certain processing, data portability where applicable, and to lodge a complaint with a competent data protection authority.

For privacy requests or help exercising your rights, contact support@deikon.app.

15. Data security

We take reasonable technical and organizational measures designed to protect personal data against unauthorized access, loss, misuse, or alteration.

However, no system can be completely secure, and we cannot guarantee absolute security.

16. Children's data

Deikon is not intended for children, and we do not knowingly collect personal data from children.

17. Changes to this Privacy Policy

We may update this Privacy Policy from time to time.

The current version will be made available through the Service. Where required, we will notify users of material changes in an appropriate manner.

18. Contact

If you have questions about this Privacy Policy or how personal data is processed, contact:

Philip Dimitris Doukakis ELTA ACHILLEIOY POST BOX 57 49084, CORFU GREECE Email: support@deikon.app

Privacy Policy | Deikon