Last updated: April 16, 2026
Overview
Alto Weather is designed to work without accounts, advertising, analytics, or tracking SDKs. Forecast, radar, air quality, search, and mapping requests are made directly from your device to the providers needed to return results. Any saved locations, activity preferences, and cached weather data remain in your app sandbox on device.
Location Data
Alto Weather uses your device's location only to:
- show weather for your current position
- resolve place names and regional context
- determine local time and time zone
Your coordinates may be sent directly from your device to third-party weather and mapping providers in order to return forecasts, alerts, radar imagery, air quality data, search results, and reverse-geocoded place names. We do not operate our own server infrastructure for storing your location, and we do not maintain any location history.
Weather and Mapping Providers
Alto Weather currently relies on the following third-party services:
- Apple Weather / WeatherKit (apple.com) — primary source for current conditions, hourly, and daily weather data
- Open-Meteo (open-meteo.com) — global forecasts, historical climate data, and air quality data
- National Weather Service (weather.gov) — detailed forecasts and alerts for U.S. locations
- MET Norway (api.met.no) — fallback forecast data for supported locations
- RainViewer (rainviewer.com) — radar imagery metadata and tile references
- Anthropic (anthropic.com) — Alto Intelligence summaries and weather-language generation features
- Apple MapKit / Apple Maps — location search, reverse geocoding, and map services
Weather data provided by Apple Weather. For attribution details, visit weatherkit.apple.com/legal-attribution.html
These providers receive only the information needed to fulfill a request. Please review each provider's own privacy policy for details on how they handle requests.
Alto Intelligence
Some parts of Alto Weather send structured weather context to Anthropic in order to generate editorial summaries, alert translations, and outdoor guidance. That context may include forecast values, current conditions, weather alerts, planner insights, and the location name shown in the app. We do not send account data because Alto Weather does not use accounts.
These requests are made directly from the app and are used only to return the requested generated text. If you use a feature powered by Alto Intelligence, the related weather context is shared with Anthropic to produce that response.
Activity Preferences
Alto Weather lets you personalize outdoor activity recommendations by adding, removing, and pinning activities, and by recording check-ins. All activity preferences, pinned activities, and check-in history are stored locally on your device using standard app storage. This data is never sent to any server.
Activity guidance is informational only and does not constitute professional safety or health advice. Always check local conditions before engaging in outdoor activities.
Calendar Integration
Alto Weather can optionally add outdoor activity plans to your device's calendar. This requires your explicit permission via the system calendar access prompt. Calendar events are created locally using Apple's EventKit framework and are saved directly to your default calendar. Alto Weather does not read, sync, or transmit any existing calendar data. You can revoke calendar access at any time in Settings.
Saved Locations
Locations you add manually are stored locally on your device in the app's private storage. We do not receive or store that information on any server we operate.
Offline Cache
Weather data, radar references, and historical climate responses may be cached locally on your device to improve launch speed and reduce repeat downloads. This cached data remains on your device.
Third-Party Services
Alto Weather does not include third-party analytics frameworks, advertising SDKs, or user-tracking tools. We do not use cookies, fingerprinting, or cross-app tracking technologies. As with any internet request, third-party providers may still receive your IP address and normal request metadata required to serve content.
Data Collection Summary
| Personal information collected by Alto Weather | None |
| User accounts | None |
| Advertising | None |
| Analytics or tracking by Alto Weather | None |
| Data stored locally on your device | Saved locations, activity preferences, pinned activities, check-in history, calendar events you create, and cached weather data |
| Data sent to third-party providers | Location coordinates, search queries, weather context for Alto Intelligence features, and standard request metadata |
Children's Privacy
Alto Weather does not knowingly collect personal information from children or adults. The app is designed as a general weather utility and does not include social features, chat, or user-generated content.
Changes to This Policy
We may update this privacy policy from time to time. If we do, the revised policy will appear in the app and in this document with an updated revision date.
Contact
If you have questions about this privacy policy, please visit our support page.