A card-catalog index of 837 sites across 22 subject drawers.
Signal accepts submissions from any legitimate web property. Choose the drawer that fits your subject and file your entry — review is straightforward and listing is provided at no charge. Free listing
+ Add your siteSignal is a web directory organized like a library card catalog — 837 sites filed across 22 subject drawers, each recorded by domain, category, and submission date. It is a neutral reference index maintained for browsing and research, not a ranking platform.
Yes. Filing an entry in the Signal catalog is free. Complete the submission form, select the appropriate subject drawer, and if your site is accepted it will be indexed at no charge.
Each site is assigned to one of 22 subject drawers based on its primary category. Within each drawer, entries are listed in catalog order by submission date. The full list of drawers is shown on the Signal home page.
Navigate to the Add a Site page, select the drawer that best matches your subject, and complete the submission form. Accepted entries are added to the permanent index after review.
Yes. Each submission is reviewed for category fit and basic site criteria before a catalog entry is created. This keeps the Signal index consistent and ensures every drawer reflects its stated subject area.
Review times vary. The Signal catalog is maintained manually, so processing can take several days. You will not receive an automated confirmation, but accepted entries are added to the public index once reviewed.
Signal currently indexes 837 approved sites distributed across 22 subject drawers. The Miscellaneous Holdings drawer is the largest single section, with 189 entries covering subjects that span multiple categories.
No. Signal is an independent directory maintained as a public reference resource. It has no affiliation with search engines and does not influence how sites appear in external search results.
Signal is a structured web directory organized in the tradition of the reference library, cataloging 837 indexed sites across 22 subject drawers. Each entry is recorded by domain, category, and submission date, providing a neutral and browsable index of the open web without algorithmic ranking or editorial scoring. From wagering platforms to legal practices, manufacturing suppliers to media publications, Signal holds a cross-section of online resources filed consistently regardless of size or commercial standing. New submissions are reviewed for category fit and basic site quality before a catalog entry is assigned and the record is added to the permanent index. Signal's card-catalog approach makes it a reliable starting reference for researchers, procurement professionals, and general browsers seeking organized access to web resources across 22 defined subject areas.