# Substack

id: ent_substack  
wikidata: Q63435709  
kind: organization  
timeline: /timelines/substack.md  
page: /record/substack  

American online newsletter platform

## All claims

One claim per line, newest first. Superseded claims stay visible.

- [Substack](/record/substack.md) | legal_form | corporation | valid 2017-11-29 to present | conf 0.60 | unverified | [clm_B3C27AECAA2F](/claim/clm_B3C27AECAA2F.md)
  sources: https://www.wikidata.org/wiki/Q63435709
- [Substack](/record/substack.md) | x_username | SubstackInc | valid 2017-06-20 to present | conf 0.60 | unverified | [clm_599505331ABE](/claim/clm_599505331ABE.md)
  sources: https://www.wikidata.org/wiki/Q63435709
- [Substack](/record/substack.md) | website | https://substack.com/ | valid undated to present | conf 0.45 | unverified | [clm_41D9CDDFD7CB](/claim/clm_41D9CDDFD7CB.md)
  sources: https://www.wikidata.org/wiki/Q63435709
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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.