The post-quantum ecosystem, indexed

Each of the four indexes prints its own inclusion rule at the top of its page, and every entry carries a one-sentence note saying how it meets that rule. Where a subject qualifies awkwardly, the note says so rather than smoothing it over. A rule a reader cannot see is just a bias, and a rule that is never applied visibly to an individual entry is asking to be trusted on the hard part.

From the subject's own site, repository or feed, linked at the foot of every profile under Sources. The rule the writing follows is to state what a subject says about itself and link to where it says it. Where a company's own site does not give a founding date or a headquarters, neither does its entry, however easy that is to find elsewhere.

No. There is no ordering, no score, no star rating and no editor's pick. Entries in a category are shown the same way at the same size, and the approach labels on firms all render in one colour on purpose, because colour-coding them would rank them. Listing is not endorsement, and every outbound link carries nofollow.

Post-quantum is used to mean several incompatible things, so each firm carries a label recording which one its own site describes: NIST-standardised algorithms, a NIST candidate rather than a finalised standard, a scheme of the firm's own, an algorithm the site does not name, or quantum key distribution. Each label is printed with its definition beside it. They are descriptive, not a verdict, and none means better or worse.

No. A label is added only where the subject's own site supports it, so its absence means we did not find the subject stating that thing, never that the opposite is true. Every firm currently in the index carries at least one label, because a half-labelled list would make an unlabelled firm look like a finding rather than a gap.

Because that index is a list of firms we compete with, and putting ourselves in it would be marketing wearing a directory's clothes. Our tooling IS in the open-source index, which is a different situation: it meets that category's printed test the same way every other project does, it is marked as ours in the row and on its page, and it gets no ordering advantage. Marking it is what keeps the list a directory rather than an advertisement.

Every entry shows the date it was last checked against its sources, and the hub shows the most recent of those dates across the whole directory. A directory is only as good as its last review, so the pages say when that was rather than implying they maintain themselves.

Tell us and we will correct it. Corrections to a subject's own entry are the easiest kind to make, because the standard is simply what that subject publishes about itself. Being added means meeting the printed rule for a category, which is the same test applied to everything already listed.