Privacy Policy
Hanabi AR ("the Service") is a web application that simulates how a fireworks display would appear from your current location. This policy sets out what information the Service collects and how it is handled.
1. Information collected and its purpose
| Information | How it's collected | Purpose and handling |
|---|---|---|
| Location (latitude, longitude, elevation) | Browser Geolocation API (requires permission) | Used to calculate the direction, elevation, and distance to a fireworks venue. Calculations happen mainly on your device. When checking for building/terrain obstructions, it is sent along with the selected event ID to our server (Cloudflare Workers), which only temporarily caches it rounded to roughly a 100 m mesh, and never stores or logs the raw coordinates. |
| Camera video | Browser Camera API (requires permission) | Processed on-device only, as the background for the AR display. Video is never sent to or stored on a server. Images created with the screenshot-sharing feature are only shared when you choose to do so. |
| Device orientation (compass, tilt) | Browser sensor API (requires permission on iOS) | Used on-device only, to align the AR display. Never sent to a server. |
| Settings (compass offset, floor number, etc.) | Browser local storage | Stored only on your device, to restore your settings the next time you use the Service. |
2. Transmission of information to external services
Using the Service involves communication with the following external services (disclosed under Japan's Telecommunications Business Act external transmission rules).
| Recipient | Information sent | Purpose |
|---|---|---|
| Geospatial Information Authority of Japan (elevation API, map tiles) | Coordinates of the displayed map area and elevation lookups, IP address | Displaying maps and retrieving terrain elevation |
| Cloudflare (hosting, API) | IP address, access logs, obstruction-check requests | Delivering the Service and processing obstruction checks |
| Google Analytics (only with consent) | Pages viewed, environment info, cookie identifiers | Analyzing usage and improving the Service |
| Google AdSense (after ads are enabled, only with consent) | Cookie identifiers, browsing information | Serving ads and measuring impressions |
3. Use of cookies, etc.
The Service may use cookies and similar technologies for usage analytics and ad delivery. These are only enabled if you consent via the banner shown on your first visit. You can withdraw consent at any time by clearing your browser's site data. For how Google handles this information, see Google's policies and terms .
4. Disclosure to third parties
We do not disclose collected information to third parties, except where required by law.
5. Contact
For questions about the Service or this policy, please contact us at the address below.
Email: hanabi.ar.app@gmail.com
6. Revisions
The content of this policy may be revised without notice as needed. We will announce any material changes within the Service.