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Proptonomy

Editorial standards

The rules every published fact on this site follows.

Operators make buying decisions on the numbers we print, and assistants repeat them. So each statistic, comparison, customer figure and product claim here is held to the same twelve rules, and you can hold us to them.

Last reviewed 23 September 2026 · Owned by the founders · Corrections to hello@proptonomy.ai

Hands checking a printed page with a pencil, ticking off footnotes.
Illustration.

The twelve rules

What a page has to satisfy before it goes out.

  1. 01

    Every number has a named source and a date

    Each statistic names the organisation that measured it, the document, the link and the day we read it. A number without all four is not published.

  2. 02

    Primary sources, not a blog quoting a blog

    We cite the statistics office, the filing, the dataset or the survey owner. When the only place a number appears is a secondary write-up, it stays out.

  3. 03

    The source sits next to the claim

    Attribution is at the point of the claim, on the same card or in the same sentence, not in a bibliography at the foot of the page.

  4. 04

    Vendor claims are labelled as vendor claims

    A survey run by a software company says so, with its sample size. A number a vendor states about its own product is marked as the vendor’s claim, including ours.

  5. 05

    Our own figures come with their method

    First-party numbers state what was measured, where and when. The Heimby figures, for example, say which share of which work the AI handles, measured on Heimby’s own operation in September 2026, with the method on the About page.

  6. 06

    Comparisons use only what the other company publishes

    Every competitor fact links to that company’s own page. Where a vendor does not publish something, the cell says “Not stated publicly” instead of a guess, and each comparison lists where the other product is ahead.

  7. 07

    Every comparison carries a review date and is re-checked

    Comparison and research pages show the day they were last reviewed. We re-read the sources at least every ninety days and whenever a vendor tells us something changed.

  8. 08

    Generated images are atmosphere, never evidence

    Photographs made with an image model are captioned “Illustration”. Product screens are labelled “Example data” or “Interactive example”. Neither is ever presented as a customer’s real operation.

  9. 09

    Customers are named only with permission

    Logos, names and quotes appear only after the customer has agreed in writing. Figures from a customer’s operation are shown only in the form they approved.

  10. 10

    No superlative without a measure

    “Fastest”, “best” and “most” appear only next to the measurement that makes them true, with its date. Otherwise we describe what the product does and let the reader judge.

  11. 11

    What machines read matches what people read

    The facts in llms.txt, the sitemap and the structured data are generated from the same source as the page. FAQ markup is only emitted for answers that are visible on the page.

  12. 12

    Corrections are dated and visible

    When we get something wrong, we fix it on the page, say what changed and when, and thank the person who told us if they want to be named.

Labels you will see

Six words that tell you what you are looking at.

They appear on captions, panel headers and table cells across the site.

Illustration
A generated or staged image that sets a scene. Not a customer, not a real event.
Example data
A product screen with invented properties and guests, showing a feature that exists.
Interactive example
The same, but you can click it. Nothing you do is sent anywhere.
First-party
Measured by Proptonomy in a real operation, with the method linked.
Vendor claim
What a company says about its own product, including us. Not independently verified.
Not stated publicly
The company does not publish this. We do not fill the gap with an estimate.

Enforced by the build

Some rules are code, not good intentions.

Where a rule can be checked mechanically, the site will not build until it passes.

  • scripts/check-i18n.mjs

    The build fails while any Norwegian string on the site is still untranslated, so a Norwegian reader never meets a silent English fallback.

  • src/seo/routes.ts

    One registry produces each page’s title, canonical link, sitemap entry, FAQ markup and llms.txt line, so they cannot drift from each other.

  • scripts/prerender.mjs

    Every page is rendered to static HTML at build time, so assistants and crawlers that do not run JavaScript read the same words you do.

Corrections

Found something wrong, out of date or unfair to a competitor? Tell us.

Send the page, the claim and your source. We check it against the primary source, correct the page with a dated note, and reply to you. Competitors are welcome to write too.

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