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PrivacyNotice

Last updated October 2026

MetaBlend is a free, in-development weather app with no accounts and no sign-up. We keep data collection to the minimum needed to run the service and to measure how accurate each weather source is. This is a plain-language summary, not legal advice.

What stays on your device

We store a few small preferences locally so the app remembers your choices: language, temperature unit, theme, your selected forecast range, your consent to this notice, and your recently searched and saved cities. The last forecast you viewed is cached so the app still works offline. None of this leaves your browser, and you can clear it anytime by clearing your site data.

Weather feedback you submit

When you report “how’s the weather right now,” we store the city, the temperature and condition you entered, the date, and the searched city’s approximate map coordinates (from our geocoder — never your device’s GPS position). This is used to score how close each weather source was, and reports appear as city-level points on the public accuracy heatmap. It is not linked to your name, email, or any account, because there are none.

Technical data

To stop abuse, we briefly use your IP address to rate-limit feedback (one report per city per hour). It is used in memory for that check and is not stored alongside your feedback.

Analytics

We use Plausible Analytics, a privacy-friendly, EU-hosted tool that counts visits without cookies and without collecting personal data. We only see aggregate numbers (e.g. page views), never individuals. We also use Vercel Speed Insights, which measures how quickly pages load (anonymous performance numbers such as load time), likewise without cookies and without identifying you.

Third-party services

To produce a forecast we send the city or coordinates you search to weather and geocoding providers, and we receive their data back:

  • Open-Meteo (incl. geocoding, air quality, historical archive)
  • Photon (komoot) and OpenStreetMap — peak search and summit heights: the search text and, with “Near me”, a location rounded to about 10 km; for marked routes our server sends only the summit’s coordinates
  • MET Norway, OpenWeatherMap, WeatherAPI, Tomorrow.io, Visual Crossing, World Weather Online, Weatherstack, NASA POWER, GeoSphere Austria, NWS (US), Bright Sky (DWD), SMHI — plus ECMWF/GFS/ICON via Open-Meteo
  • BigDataCloud — only if you use “my location”, to turn your coordinates into a city name (reverse geocoding)
  • NOAA Aviation Weather (METAR reports) and Meteostat — receive city coordinates server-side to fetch reference measurements that score each source's accuracy
  • Map tiles by OpenStreetMap contributors (heatmap and rain radar) and OpenTopoMap (route maps in the app)

The app is hosted on Vercel and its database runs on Supabase (EU region, Frankfurt). Each provider handles the data it receives under its own privacy policy.

Notifications (app)

If you turn on notifications in the app, we store your phone’s push token (from Apple or Google), a hash of a random key the app creates, your home city, which alerts you switched on and your briefing hour, planned peaks and dates, your language and unit, and a log of what we sent in the last 14 days. There is no account and no location. Phones that haven’t opened the app for 90 days are deleted automatically, planned hikes after their day. Routes stay on your phone; a route you plan a hike on is stored with the plan to send its alerts and deleted with it. Turning notifications off in the app or deleting the app stops them.

How long we keep it

Stored forecasts and internal bookkeeping rows are automatically deleted by a daily cleanup job (typically within about 48 hours); consensus snapshots and server error logs are deleted after 30 days. Community feedback reports are kept for as long as they power the public accuracy heatmap and the long-term source rankings — or until you ask us to remove them (see below). Aggregate accuracy weights are anonymous and kept indefinitely.

Your choices

You can use the app without sharing your location, clear your locally stored preferences anytime, and request removal of feedback data by opening an issue on our GitHub repository.

Contact

Questions about privacy? Email info@metablend.app or open an issue at github.com/NeverFirstTry/metablend. As MetaBlend evolves, this notice may change; the “last updated” date above will always reflect the current version.