Privacy Policy
Last Updated: April 4, 2026
Introduction
This Privacy Policy describes how Guuster ("we", "us", or "our") collects, uses, and shares information when you use our website, mobile application, and related services (collectively, the "Service"). We are committed to protecting your privacy and being transparent about our data practices.
Information We Collect
Information You Provide
When you create an account or use our Service, we may collect:
- Account information: Email address, name, and profile details provided during registration (including via Google or Apple Sign-In).
- Receipt data: Photos and images of receipts you upload for scanning and analysis.
- Location data: Location information you provide or that is derived from your use of location-based features (e.g., finding nearby deals).
Information Automatically Collected
When you visit our website, we automatically collect certain technical information, including:
- Device information (device type, operating system)
- Browser type and version
- Pages visited and interactions with our website
- Date and time of your visit
Analytics and Error Tracking
We use Sentry and PostHog to help us understand how our Service performs and to improve the user experience.
Sentry
- Session replays: Anonymous recordings of user sessions to help us improve the user experience. These recordings capture interactions like clicks and scrolls, but sensitive information (like email input) is masked.
- Error tracking: Technical information about any errors that occur, including stack traces and browser context.
- Performance monitoring: Data about page load times and application performance.
PostHog
- Product analytics: Usage patterns, feature interactions, and user journeys to help us improve the Service.
- AI/LLM usage tracking: Aggregated metrics on AI-powered feature usage to monitor quality and performance.
How We Use Your Information
We use the information we collect to:
- Provide the Service: Scan and analyze receipts, track prices, and find deals using AI-powered features.
- Authenticate your account: Verify your identity via email, Google, or Apple Sign-In.
- Communicate with you: Send you updates, product news, and other information related to Guuster.
- Improve our Service: Analyze usage patterns to improve functionality and user experience.
- Fix issues: Identify and resolve technical problems with our Service.
Third-Party Services
We use the following third-party services that may collect information:
Sentry
Purpose: Error tracking, performance monitoring, and session replays.
Data shared: Error logs, device information and anonymized session recordings.
Privacy policy: https://sentry.io/privacy/
Resend
Purpose: Email delivery service for sending notifications and updates.
Data shared: Email address.
Privacy policy: https://resend.com/legal/privacy-policy
Supabase
Purpose: Database hosting and user authentication (including email, Google, and Apple Sign-In).
Data shared: Account information, user data, and authentication tokens.
Privacy policy: https://supabase.com/privacy
PostHog
Purpose: Product analytics and AI/LLM usage tracking.
Data shared: Usage events, device information, and feature interaction data.
Privacy policy: https://posthog.com/privacy
Google Gemini (AI)
Purpose: AI-powered receipt scanning, analysis, and product recognition.
Data shared: Receipt images and extracted text data sent for processing.
Privacy policy: https://ai.google.dev/gemini-api/terms
Google Maps Platform
Purpose: Location-based services including geocoding and finding nearby deals.
Data shared: Location data and address information.
Privacy policy: https://policies.google.com/privacy
Google & Apple Sign-In
Railway
Purpose: Cloud hosting provider for our API backend infrastructure.
Data shared: All data processed by our API passes through Railway's infrastructure, including server logs.
Privacy policy: https://railway.com/legal/privacy
Data Storage and Security
We implement appropriate technical and organizational measures to protect your personal information, including:
- Encrypted connections (HTTPS/TLS) for all data transmission
- Secure storage practices with our database provider
- Limited access to personal data
However, no method of transmission over the internet or electronic storage is 100% secure, and we cannot guarantee absolute security.
Your Rights
Depending on your location, you may have the following rights regarding your personal data:
- Access: Request a copy of the personal data we hold about you.
- Correction: Request correction of inaccurate or incomplete data.
- Deletion: Request deletion of your personal data and account.
- Opt-out: Unsubscribe from our communications at any time using the link in our emails.
To exercise these rights, please contact us at the email address provided below.
Data Retention
We retain your personal data for as long as your account is active or as needed to provide you with the Service. If you delete your account, your data will be permanently removed. Analytics and error tracking data is retained according to our third-party providers' policies (typically 90 days).
Children's Privacy
Our Service is not intended for children under the age of 13. We do not knowingly collect personal information from children. If you believe we have collected information from a child, please contact us immediately.
Changes to This Policy
We may update this Privacy Policy from time to time. We will notify you of any material changes by updating the "Last Updated" date at the top of this page. Your continued use of the Service after changes become effective constitutes acceptance of the revised policy.
Contact Us
If you have any questions, concerns, or requests regarding this Privacy Policy or our data practices, please contact us at:
- General inquiries: [email protected]
- Gergo Starosta (Founder): [email protected]