Privacy Policy
Last updated: 7 June 2026
Developer: Jason Rudowski
Contact: seafarertaxassistant.dev@gmail.com
Delete account or delete data requests will be dealt with within 30 days, all of the data associated with your account will also be deleted with a account deletion request, email requests here: seafarertaxassistant.dev@gmail.com
Seafarer's Tax Assistant ("we", "us" or "our") respects your privacy and is committed to protecting your personal data. This Privacy Policy explains how we collect, use, share and protect your information when you use the Seafarer's Tax Assistant mobile application (the "App"). It also sets out your rights under UK data protection law, including the UK General Data Protection Regulation (UK GDPR) and the Data Protection Act 2018.
1. Personal data we collect
We collect the following information when you use the App:
Account details — Email address and authentication identifier (email OTP sign-in). Lawful basis: performance of contract.
Travel records — Dates you left and returned to the UK, current abroad/in-UK status. Lawful basis: performance of contract.
Usage data — Login times and actions taken (for security and analytics). Lawful basis: legitimate interests in running the App and keeping it secure.
Subscription data — Subscription status and transaction identifiers processed through RevenueCat and Apple/Google stores. Lawful basis: performance of contract.
We do not intentionally collect special categories of personal data (such as health information or biometric identifiers). Please do not include sensitive information in your travel notes.
We do not use advertising identifiers or track you across other apps or websites.
2. How we use your data and our legal basis
Providing the App: We use your account details and travel records to provide the record-keeping and eligibility-calculation functions of the App. Lawful basis: performance of our contract with you.
Analytics and security: We analyse aggregated usage data to detect fraud, ensure system security and improve the App. Lawful basis: legitimate interests.
Aggregated and anonymised data: We may create aggregated or anonymised information — such as total voyages logged or average trip durations — to understand how the App is used and improve functionality. These insights do not identify you personally.
Legal compliance: We may process or retain information to comply with legal obligations or to respond to lawful requests.
3. Data sharing
We only share personal data when necessary:
Supabase: The App is built on Supabase, which hosts user authentication and stores structured data. Supabase acts as a data processor on our behalf. Data may be stored in data centres outside the UK or EU; we rely on Supabase's data processing agreements and appropriate safeguards to protect personal data when it is transferred internationally, consistent with ICO guidance.
RevenueCat: Manages subscription billing. Transaction data is processed through Apple's App Store and Google Play Store in accordance with their respective privacy policies.
Legal and safety reasons: We may disclose information if required by law, in response to lawful requests by public authorities, or if necessary to protect our rights, property or safety or that of others.
We do not sell or rent your personal data.
4. How long we keep your data
We keep personal data only for as long as necessary to fulfil the purposes for which it was collected, following ICO guidance. Your account details and travel records are kept while your account remains active. If you delete your account, we will delete or anonymise your data within 30 days unless we must retain certain information for legal, accounting or dispute-resolution purposes (for example, to comply with statutory record-keeping requirements under UK tax law).
5. Security
We take appropriate technical and organisational measures to secure your personal data against unauthorised access, loss or damage. Your data is stored in secure databases provided by Supabase with row-level security policies enforcing data isolation. Access is restricted through role-based permissions. However, the internet is not completely secure and we cannot guarantee absolute security.
If we become aware of a personal data breach that affects your information, we will notify you without undue delay and comply with any reporting obligations to the ICO or other relevant supervisory authorities.
6. International data transfers
Because we use Supabase's cloud services, your data may be transferred outside the UK or EU. UK data protection law requires us to inform you of such transfers and the safeguards in place, as described by the ICO (ico.org.uk). We rely on Supabase's data processing agreements and appropriate safeguards, including Standard Contractual Clauses, to ensure that personal data receives an equivalent level of protection.
7. Your rights
Under the UK GDPR you have the right to:
• Be informed about how your data is used.
• Access the personal data we hold about you.
• Correct inaccurate or incomplete data.
• Erase your data ("right to be forgotten") in certain circumstances.
• Restrict or object to the processing of your data.
• Port your data (receive your data in a structured, commonly used format).
• Withdraw consent where processing is based on consent.
• Complain to the Information Commissioner's Office (ICO) if you believe we have not complied with your data-protection rights.
To exercise any of these rights, please contact us at seafarertaxassistant.dev@gmail.com.
8. Account deletion
You can delete your account at any time via the Settings screen in the App.
What is deleted: When your account deletion request is processed, we delete your account record, your travel/voyage records and related data.
Retention and timing: We aim to complete account deletion within 30 days of a verified request. We may retain limited information where required for legal, accounting, fraud-prevention or dispute-resolution purposes. We may keep aggregated and anonymised usage statistics that do not identify you.
9. Children's privacy
The App is intended for adult seafarers. We do not knowingly collect personal data from children under 16. If we discover that a child has provided us with personal data, we will delete it immediately.
10. Changes to this policy
We may update this Privacy Policy from time to time. We will notify you of any significant changes through the App. The latest version will always be available on this page.
Security checks use cloudflare: https://www.cloudflare.com/en-gb/turnstile-privacy-policy/
Revenuecat Apple Pay Privacy: https://www.revenuecat.com/docs/platform-resources/apple-platform-resources/apple-app-privacy
Revenuecat Google Play Data Saftey: https://www.revenuecat.com/docs/platform-resources/google-platform-resources/google-plays-data-safety
Supabase Privacy Policy: https://supabase.com/privacy
Questions? Contact us at seafarertaxassistant.dev@gmail.com