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.
Feishu Digital builds browser extensions and web applications, including:
Arztrechnung Prüfer — Free web app for checking medical bills (GOÄ/GOZ)
JVEG Rechner — Web app for JVEG compensation claims
Readability Scorer — Chrome Extension for readability analysis
AI Chat Organizer — Chrome Extension for organizing AI conversations
This list may change as we add or discontinue products.
3. Data we collect
Browser Extensions (Readability Scorer):
All text analysis and data processing happens locally in your browser
We do not transmit, store, or have access to your 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
AI Chat Organizer (Chrome Extension):
The extension organizes your AI conversations by reading conversation titles and IDs from the platforms you use (ChatGPT, Claude, Gemini)
To load your full conversation list, the extension uses the platform’s own internal API on your behalf (same-origin requests using your existing session — no credentials are shared with us or any third party)
Conversation titles and IDs are cached locally on your device (via the browser’s storage API) so your organized folders persist across page reloads
We never read, store, or transmit the content of your conversations — only titles and IDs are processed
Your folders, tags, and settings are stored locally and synced via Chrome Sync (Google’s built-in browser sync)
No data is sent to Feishu Digital servers. The only external call is license key validation via the Lemon Squeezy API
Static Web Apps (Arztrechnung Prüfer):
All calculations and data processing happen entirely in your browser (client-side)
No data is transmitted to any server
Uploaded files (PDFs, images) are processed locally and never stored or sent
Web Apps with Accounts (JVEG Rechner):
Account data (email, name) for authentication
Application data you enter (stored encrypted in the EU)
No data is shared with third parties except for payment processing (Lemon Squeezy/Stripe)
This Website (feishudigital.de):
Static site hosted on GitHub Pages
We do not use cookies, analytics, tracking pixels, or 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. Third-party services
Lemon Squeezy — Payment processing and license management
Supabase — Database and authentication for web apps (EU servers, Frankfurt)
GitHub Pages — Static website hosting
Cloudflare Pages — Static web app hosting
Fly.io — Web application hosting (Frankfurt, Germany)
Bunny Fonts — GDPR-compliant font delivery (no Google Fonts)
6. 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.
7. Data storage and security
Browser extension data (settings, folders, tags, cached conversation titles) is stored
locally on your device using the browser’s storage API and never transmitted to our servers.
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.
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.