# Method

## Crawl date

The Y Combinator crawl ran on 2026-09-04.

## Fetch method

Each company homepage was loaded in a headless browser and the same
fingerprint table was run over the rendered DOM. Where the render failed, a
plain HTTP fetch stood in, which was the case for 144 domains.

## Merge rule

One record per domain. The rendered record is used where one exists and the
plain fetch otherwise, so a domain is never counted twice.

## Floors

- A share is not published on a base under 20 crawled domains. Every per-year
  base here is at least 69.
- A share is not published for a tool with fewer than 5 installs in a block;
  the report prints "<5" in that cell.

## Homepage limit

Only the homepage was fetched. Anything behind a login, at a checkout, on a
subdomain or running on the server leaves nothing to score, so every share is
a floor. This is one crawl on one day and not a panel: no company was watched
switching anything, and a 2014 company running Webflow may have put it there
at any point since.

## Funnel

| Step | Domains |
| --- | ---: |
| Y Combinator domains on the list | 6,133 |
| Fetched and scored | 5,386 |
| Dropped | 747 |
| Scored and dated 2012 to 2026 | 5,175 |

The crawl outputs record how many domains were dropped, not why each one was
dropped. The render logs hold per-run ok and fail totals only, and the
plain-fetch failure log covers the plain crawl rather than the merged set, so
no breakdown of dead domains, blocks, timeouts and unscorable pages is
recoverable from what was kept.

## Licence

Data: CC BY 4.0, Installmap, 2026-09-04.