Privacy Policy
Feishu Digital — Last updated: February 13, 2026
We believe in minimal data collection. Our browser extensions process data locally in your browser. We do not run analytics, do not track users, and do not sell data.
1. Who we are
Feishu Digital is operated by Kevin Lin, Grootsruhe 3, 20537 Hamburg, Germany. Email: feishudigital@gmail.com.
2. Our products
Feishu Digital builds browser extensions and web applications:
- Readability Scorer — Chrome Extension for real-time readability analysis
- BayScout — Chrome Extension for eBay seller tools
- AI Chat Organizer — Chrome Extension for organizing AI chat conversations
- Rechnungsfluss — Web application for German e-invoicing (XRechnung)
3. Data we collect
Browser Extensions (Readability Scorer, BayScout, AI Chat Organizer):
- All text analysis and data processing happens locally in your browser
- We do not transmit, store, or have access to your text content
- Settings and preferences are stored locally using the browser's storage API
- License key validation (Pro users) sends only the license key to the Lemon Squeezy API — no user content
Web Applications (Rechnungsfluss):
- Account data (email, name) for authentication
- Invoice data you enter for processing (stored encrypted in the EU)
- No data is shared with third parties except for payment processing (Lemon Squeezy/Stripe)
This Website (feishudigital.de):
- This website is a static site hosted on GitHub Pages
- We do not use cookies, analytics, tracking pixels, or any third-party scripts
- GitHub Pages may collect basic server logs (IP address, browser type) — see GitHub Pages privacy
4. Payment processing
Payments are processed by Lemon Squeezy (Lemon Squeezy, LLC), who acts as Merchant of Record. Lemon Squeezy handles billing, taxes, VAT, and invoicing. We do not store credit card numbers or payment details. See Lemon Squeezy's Privacy Policy.
5. Your rights (GDPR/DSGVO)
As an EU resident, you have the right to:
- Access your personal data
- Rectify inaccurate data
- Request deletion of your data
- Object to processing or request restriction
- Data portability
- Lodge a complaint with a supervisory authority
To exercise any of these rights, email us at feishudigital@gmail.com.
6. Data storage and security
Browser extension data is stored locally on your device and never transmitted. Web application data is stored on EU-based servers (Supabase, hosted in Frankfurt, Germany). We use encryption in transit (HTTPS/TLS) and at rest where applicable.
7. Third-party services
- Lemon Squeezy — Payment processing and license management
- Supabase — Database and authentication for web applications (EU servers)
- GitHub Pages — Static website hosting
- Fly.io — Web application hosting (Frankfurt, Germany)
8. Changes to this policy
We may update this policy from time to time. Changes will be reflected on this page with an updated date. For material changes, we will notify affected users via email or product update.
9. Contact
Questions about privacy? Contact us at feishudigital@gmail.com.
Full contact details: see Impressum.