Privacy Policy
Chord Trainer ("the App") is a product of Aaron Technologies OÜ, registered in Estonia (Registry Code: 17336129, VAT ID: EE102955587). This privacy policy explains how we collect, use, and protect your information.
1. Data We Collect
1.1 Data Stored Locally (Your Browser)
The App uses localStorage in your browser to store:
- Your practice settings (difficulty, voicing type, notation system)
- Session history (timestamps, scores, chord timings)
- Practice streak data
- Theme preference
This data never leaves your device. It is not sent to any server. You can delete it at any time by clearing your browser data.
1.2 Web MIDI API
If you grant permission, the App accesses your MIDI devices through the Web MIDI API. MIDI data (note on/off events) is processed entirely in your browser and is never transmitted.
1.3 Analytics
We use Vercel Analytics to collect anonymous, aggregated usage data: page views, country, browser type, and device type. No personal data, cookies, or tracking IDs are used. Vercel Analytics is GDPR-compliant and does not use cookies.
1.4 Hosting
The App is hosted on Vercel (Vercel Inc., San Francisco, CA). Vercel may collect server logs including IP addresses for security and performance purposes. See Vercel's Privacy Policy.
1.5 Fonts
We use Google Fonts (Inter) loaded from fonts.googleapis.com. Google may collect
your IP address when fonts are loaded. See Google's Privacy Policy.
2. Data We Do NOT Collect
- No account creation, no email collection
- No cookies (except technical ones from Vercel)
- No personal information
- No audio recordings
- No MIDI data transmission
3. Third-Party Services
| Service | Purpose | Privacy Policy |
|---|---|---|
| Vercel | Hosting & Analytics | Link |
| Google Fonts | Typography | Link |
| Cloudflare | DNS & CDN | Link |
4. Your Rights (GDPR)
Under the General Data Protection Regulation (GDPR), you have the right to:
- Access your data — all practice data is in your browser's localStorage
- Delete your data — clear your browser data or localStorage
- Portability — your browser's developer tools can export localStorage
- Object — contact us to object to any processing
5. Children's Privacy
The App does not knowingly collect personal data from children under 16. Since no personal data is collected at all, no special measures are required.
6. Changes to This Policy
We may update this policy occasionally. The "Last updated" date at the top indicates the latest revision.
7. Contact
Aaron Technologies OÜ
Sepapaja tn 6
15551 Tallinn, Estonia
Registry Code: 17336129
VAT ID: EE102955587
Email: info@jazzchords.app
Alternative: admin@must-seen.com
Phone: +49 15679 706761
Website: jazzchords.app