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Open Atlas

Architecture

Open-source stack, hosted in Germany. No US cloud provider, no tracking, no cookie banner.

Hosting

Server in Germany with a European provider. Domain also with a German registrar.

Application

  • Svelte with SvelteKit (server-side rendering, prerender-first)
  • Map: MapLibre GL + OpenFreeMap (open source, based on OpenStreetMap)
  • Geocoding: Nominatim (OpenStreetMap Foundation, EU)
  • Styling: Tailwind CSS, IBM Plex font family (OFL licence)

Data sources

  • ODIS Berlin
  • FIS-Broker (Geoportal Berlin)
  • Statistics Office Berlin-Brandenburg (Amt für Statistik Berlin-Brandenburg), also the source of election data for the House of Representatives (Abgeordnetenhaus) and the District Assembly (BVV)
  • Federal Election Commissioner (Bundeswahlleiterin), Bundestag election data
  • German Meteorological Service (DWD)
  • OpenStreetMap

Source, licence and as-of date per layer in the methodology and on the licences page.

Interface for AI assistants (alpha)

Eleven tools for structured queries instead of HTML scraping: address search, point query, layer discovery, Kiez profile, layer metadata plus four election tools (list elections, result per address + aggregation level, election comparison, polling district geometry) and two Kiez Finder tools (set weights, read finder state). Each response contains source, licence and as-of date.

WebMCP has been a W3C Community Group draft since August 2025: a browser-native JavaScript API for websites that deliver tools to LLMs. Not yet a Recommendation, and the spec is still changing.

Until WebMCP arrives natively in stable browser releases, the API runs through a polyfill that LLM browser extensions load, or that the site loads on mount.

Manifest discovery (convention, not standard): /.well-known/webmcp.json (mirrors /webmcp-manifest.json). Plain-text variant: /llms.txt / /llms-full.txt following llmstxt.org.

Spec status, browser support and instructions for Chrome Canary: /webmcp.

Not used

  • Cloudflare, AWS, GCP, Azure
  • Google Analytics, Facebook Pixel, advertising networks
  • Third-party embeds
  • Tracking cookies, cookie banners
  • User accounts, login, newsletter collection
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