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PromptSign.ai vs ctlogs.dev

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

PromptSign.ai compared with ctlogs.dev
DetailPromptSign.ai logo PromptSign.aictlogs.dev logo ctlogs.dev
What it doesCode signing for AI skills and agents Search billions of TLS certificates from all public Certificate Transparency logs by domain, wildcard, organization, serial number or SHA-256 fingerprint
StageNot given Not given
FoundedNot given Not given
Based inNot given FR
Pricing modelNot given Not given
PricingNot given Not given
Key features
  • Sign skills and agents with verified identity authentication
  • Verify file integrity using SHA-256 fingerprints
  • Offline verification without internet connection
  • Public transparency log for accountability
  • Revoke trust for compromised keys or bad actors
  • Support GitHub, Google, Microsoft and company account authentication
  • Command-line tool for integration with Claude and Codex hooks
  • Search by domain, wildcard, organization, serial number, SHA-256 fingerprint and public key (SPKI)
  • Index of 28.5 billion certificates across 88 active and 111 archived CT logs
  • 6.5 billion distinct hostnames with first-seen and last-seen dates, certificates back to 2013
  • Fast API: domain lookup 25-30 ms, subdomains 45-50 ms
  • Subdomain finder with certificate counts and first/last seen dates
  • BIMI brand logos from verified mark certificate logs
  • CAA record checker showing records as CAs see them and CAs that issued for a domain
  • Free JSON API with cursor pagination and anonymous use
  • Machine-readable documentation at llms.txt for AI agents
  • Continuous ingestion of all public CT logs with live coverage metrics
What makes it different
  • Immutable transparency log that prevents silent key revocation
  • Blocks unsigned or tampered instructions in Claude Code and Codex integration
  • Searches all public Certificate Transparency logs continuously ingested into a single index
  • Reveals subdomains hidden from DNS enumeration and web crawls through certificate search
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last check38 no change since last check
Trust Flow (Majestic)118
Citation Flow (Majestic)1929
Referring domains (Majestic)2776

3 details filled in for both companies.

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