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Vardum vs PromptSign.ai

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

Vardum compared with PromptSign.ai
DetailVardum logo VardumPromptSign.ai logo PromptSign.ai
What it doesPrivate messenger, secure phones and private AI Code signing for AI skills and agents
StageMVP Not given
FoundedNot given Not given
Based inAU Not given
Pricing modelFree Not given
PricingVardum Messenger is free during beta. Vardum Phones are available in three packages from A$1,100 delivered in 7 to 14 days in Australia. Vardum AI for Android and Vardum Desktop are in testing with no price or release date yet. Not given
Key features
  • Post-quantum end-to-end encryption with AES-GCM-256 and ML-KEM-768
  • Groups of up to 100 with post-quantum sender keys
  • 24-word identity with no name, email or phone number
  • 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
What makes it different
  • No phone number or email required - identity is 24 random words generated on your phone
  • Post-quantum cryptography protecting against future quantum computing threats
  • Designed to protect lost, stolen or taken phones with encryption at rest
  • Immutable transparency log that prevents silent key revocation
  • Blocks unsigned or tampered instructions in Claude Code and Codex integration
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 checkNot checked yet no change since last check
Trust Flow (Majestic)01
Citation Flow (Majestic)2119
Referring domains (Majestic)527

3 details filled in for both companies.

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