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Questions

Answers from an AI assistant (Claude). Anything binding happens in the intro call.

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Own products · live

Data made visible – every day, for everyone.

The Zeilen family: each “Zeile” answers an everyday question from open, official data – no account, no tracking, no ads. We build this for ourselves. You get the same care. (The products are in German.)

Wahllage am Handy
Himmelszeile am Handy
Campingzeile am Handy

01The Zeilen

One family, one hand.

Someone looking for a campsite also needs the weather, the night sky and the right time to fill up. Each Zeile stands on its own – and points to the others where it helps.

  • WetterzeileThe weather in lines
    Today· German Weather ServiceMorgen: im Norden, Westen und in der Mitte Regen, im Süden bis 25°.
    wetterzeile.com Case study →
  • TankzeileFuel prices and the right time to fill up
    The right time to fill up under the 12 o’clock rule · 10,371 stations
    tankzeile.de Case study →
  • CampingzeileCampsites and motorhome pitches
    7,764 sites from open geodata · weather, driving time, night
    campingzeile.de Case study →
  • HimmelszeileStars, moon and clouds tonight
    Night-time clouds from the DWD · 111 Messier objects · explore freely
    himmelszeile.de Case study →
  • JahreszeileSchool holidays, public holidays, bridge days
    School holidays of all 16 states, cross-checked with the ministries
    jahreszeile.de Case study →
  • WahllageElection polls, honestly averaged
    Today· dawum.de, ODbLBundestag, average of 20 polls: AfD 28.1 % · CDU/CSU 20.0 % · Grüne 14.8 %
    wahllage.de Case study →
  • Die NachtausgabePuzzles and games, new every day
    TodayPreview issue · 13 puzzles today
    dienachtausgabe.de Case study →

02Also by headon

More products of our own.

  • RechnerzentraleCalculators for money, work and everyday life
    Every formula tested against official values
    rechnerzentrale.com Case study →
  • AphantasieSelf-tests on the mind’s eye
    #1 on Google for “aphantasie test” (Search Console, avg. 1.5, 23–30 Sep 2026) · 7 self-tests · 5 languages
    aphantasie.org Case study →
  • Mind AtlasA map of inner perception
    Scrollytelling above a WebGL nebula · 0 answers on the server
    mymindatlas.org Case study →
  • GPSR SuiteShopify app: product safety details
    Manufacturer details under EU Regulation 2023/988 in Shopify metafields, also in bulk · servers in Germany
    gpsr.headon.pro
  • COA SuiteShopify app: certificates of authenticity
    One certificate per paid order, QR verification without customer data · servers in Germany
    coa-license-pdf.headon.pro

03What they share

The same rules as for your project.

  • 01

    Evidenced data

    Official and open sources with verified licences, every figure dated. Estimates are labelled as estimates.

  • 02

    Data-minimal

    No account, no tracking cookies, no third-party ad or analytics scripts. What is not needed never leaves the device.

  • 03

    Tested

    Calculations as tested functions before the interface exists. Every Zeile has its own test suite.

  • 04

    Fast

    Server-rendered, without ballast. The answer comes first, details follow as you scroll.

Something like this for your data?

Maps, lines, calculators or a whole page that answers one question: tell us which data you want to make visible.

Request an intro callhallo@headon.pro