Hours of sun in the listing — embed it for free
The Azima light widget shows on any listing page how many hours of direct sun a Vienna address gets on 21 March, 21 June and 21 December — calculated from the officially measured building heights of the City of Vienna, in the visitor’s browser, free of charge and without tracking. One line of code is enough.
Every listing says how many rooms a flat has. Almost none says whether the sun reaches them in December. Sun and shading analyses for listings exist otherwise only as paid tools; the Azima light widget puts the answer on the listing page itself — as three numbers from official data, not as an adjective.
This is what it looks like — live, for Schrankgasse 10, 3rd floor
The card above is the real widget, calculated in your browser just now. The same line of code puts it on your page.
Embed it in one line
<script src="https://viennalivingmap.com/einbetten.js" data-adresse="Schrankgasse 10, 1070 Wien" data-etage="3" data-partner="IHR-SCHLUESSEL" async></script>Without a script tag — for portals and templates that only allow frames — the same card as an iframe:
<iframe src="https://viennalivingmap.com/einbetten#adresse=Schrankgasse%2010%2C%201070%20Wien&etage=3&partner=IHR-SCHLUESSEL" title="Sonne an dieser Adresse" loading="lazy" referrerpolicy="no-referrer" style="width:100%;max-width:560px;height:300px;border:0"></iframe>The parameters
What the card shows
Why it is free
The widget is the shop window of Azima. Every card carries the link to the full light check, and that is where the paid reports are made — €19 per report, €89 per month for Premium (prices and terms on the terms page). The widget itself costs nothing, needs no account and has no limit per listing. Planned for Premium customers: the card without the link back to Azima, one row per floor instead of “below / above”, and the exposé sentence underneath.
Your visitors stay your visitors
Address and key stand in the fragment of the frame (after the “#”) and therefore never travel to a Vienna Living Map server; the access log sees only /einbetten. No cookies, no tracking, no user profiles, no referrer. The visitor’s browser fetches the building heights from data.wien.gv.at and — only when no coordinate is given — asks the City of Vienna’s address service for street and house number. One single message goes to your page: the height of the card in pixels.
Honest, even when it hurts
A measured disadvantage is never removed, only explained better. The widget shows the hours the official heights yield — 1.1 hours in December included. That is exactly why a flat hunter believes the card, and exactly what a tool paid by the advertiser to look good cannot write. The card says “not an expert report” and names its source; a certificate of insolation under ÖNORM is a different, signed document.
Open Azima, the full light check →Frequently asked
What does the widget cost?
Nothing. No account, no card, no limit per listing or per page. The reports on Azima earn the money: €19 per report, €89 per month for Premium.
Where do the numbers come from?
From the generalised roof model of the City of Vienna (officially measured building heights, CC BY 4.0), the terrain and the astronomical path of the sun: for every compass direction the model finds how high the neighbours block the horizon and when the sun stands above it. It is the same calculation as in the Azima light check.
Is this a certificate of insolation?
No. It is a model built from measured neighbouring heights and the real path of the sun; curtains, balconies and trees are not part of it. The card says so on every listing page. A certificate under ÖNORM is a different, signed document.
What does Vienna Living Map see of my visitors?
A request for /einbetten without an address, without a cookie, without a referrer. Address and key stay in the fragment of the frame, which never reaches a server. No user profiles, nothing is passed on.
Does it work outside Vienna?
No. Without official building heights Azima gives no hours; for an address outside Vienna the card says that it did not find a house.
Can I hide bad values?
No. A measured disadvantage is never removed — that holds for every card and every report and cannot be switched off. You only decide whether to embed the widget.
Why is it free when others charge for it?
Because the widget is the shop window of Azima. Every card links to the full light check, and that is where the paid reports are made. A free card on thousands of listings counts for more than a licence fee.
What is EN 17037?
The European standard for daylight in buildings. For 21 March it names thresholds for direct sun: at least 1.5 hours (minimum), 3 hours (medium), 4 hours (high). The card classifies the calculated hours by these thresholds — as a classification, not as proof.
For agents & developers: OpenImmo, floor plan, IFC · The light check · Prices and terms
Sources: City of Vienna Open Data (generalised roof model LOD2.1, address service, CC BY 4.0) · terrain from the Copernicus DEM · sun position calculated astronomically · EN 17037 thresholds for direct sun on 21 March. Orientation values, not a certificate.