PrivacyNotice

Last updated July 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 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.

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)
MET Norway, OpenWeatherMap, WeatherAPI, Tomorrow.io, Visual Crossing, World Weather Online, Weatherstack, NASA POWER, GeoSphere Austria
BigDataCloud — only if you use “my location”, to turn your coordinates into a city name (reverse geocoding)
Weather Underground (The Weather Company) 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)

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.

How long we keep it

Stored forecasts and internal bookkeeping rows are automatically deleted by a daily cleanup job (typically within about 48 hours). 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? 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.