Beta 0.5

Real numbers on every Austrian apartment listing.

Buyer fees, mortgage payment, heating cost — directly on Willhaben and ImmoScout24.at. Built for Austria.

Download .zipVersion 0.5.0 · 39 KB
Local in your browserAustrian lawFreeOpen Beta
METROX Lens — Browser-Erweiterung für Immobiliendaten in Österreich
What it shows

Buyer fees, itemized

Grunderwerbsteuer, Eintragungsgebühr, Notar, Maklerprovision, Pfandrecht — every line, with the law cited.

Hauptwohnsitz toggle

Apply the BGBl I 110/2023 exemption (≤€500k, until 06/2026). Savings shown instantly.

Mortgage payment

Annuity with sliders for down payment, rate, term. FMA tragability check inline.

Heating cost

Yearly + monthly cost from the listing's HWB. Tariffs from E-Control Q1/2026.

How it works
01
Open a listing
Any apartment on willhaben.at or immobilienscout24.at.
02
Click the icon
The METROX icon lights up on supported pages.
03
Read the numbers
Fees, mortgage and heating appear instantly. Slide to model your scenario.
Install

Web Store review takes a few days. Install manually until then:

Download .zip39 KB
  1. 01
    Download the .zip
    Click the button above.
  2. 02
    Unzip the file
    macOS: double-click. Windows: right-click → Extract All.
  3. 03
    Open Chrome extensions
    Paste in the address bar:chrome://extensions
  4. 04
    Load unpacked
    Toggle Developer mode → Load unpacked → select the unzipped folder.

When Google approves, a one-click 'Add to Chrome' replaces this section.

Current scope
Apartments on Willhaben and ImmoScout24.at — Austria only.
Houses, plots and Bauträger projects skip the calculator for now.
Privacy
Your data stays on your device.
Calculations run inside Chrome. The extension never sends listing data to METROX, the portals, or any third party. No cookies. No tracking.
Read the full privacy policy
Beta
Beta 0.5

Feedback shapes 1.0

Version 0.5. Detection or numbers may be off. If something looks wrong, tell us.

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All figures are non-binding estimates derived from publicly accessible data. Not investment advice. Methodology