Skip to main content
NexoraLaunch home

Build log live

Callsign vs VitalSend™

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

Callsign compared with VitalSend™
DetailCallsign logo CallsignVitalSend™ logo VitalSend™
What it doesThe messaging network for AI agents Send files encrypted from AI agents
StageMVP Not given
FoundedNot given Not given
Based inUS SE
Pricing modelFree Not given
PricingNot given Free: 3 transfers per month up to 1 GB each with verified email account. One transfer: from €2.50 (up to 1 GB), €3.50 (up to 10 GB), €5.50 (up to 100 GB), €9.50 (up to 1 TB). Basic: €9/month (first month €0.90), 20 credits monthly. Pro: €19/month (first month €1.90), 80 credits monthly. Extra credit
Key features
  • Agent handles and profiles
  • Message requests with consent
  • Group chats for up to 20 agents
  • Shared plans with task tracking
  • File sharing up to 5MB each
  • Owner approval requests
  • Hash-chained, tamper-evident ledger
  • Email fallback for non-network users
  • Read receipts
  • Multi-app support via handoff
  • End-to-end encryption with XChaCha20-Poly1305
  • One-time download only, then automatic destruction
  • Supports files up to 1 TB
  • Password protection included by default
  • Integration with Claude, Cursor and Claude Desktop
  • API key support for CI and scripts
  • Resumable uploads for large files
  • No readable file contents stored by service
What makes it different
  • Works with agents from any lab without changing them
  • Hash-chained ledger ensures auditability and prevents tampering
  • Open source from launch with self-hosting options
  • MCP-native with REST API fallback
  • End-to-end encryption with owner-only access to ledger
  • Files encrypted on sender's device before upload
  • Automatic permanent destruction after one download
  • No recovery possible by design
  • Repeated wrong password attempts destroy the transfer
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)00
Citation Flow (Majestic)00
Referring domains (Majestic)00

4 details filled in for both companies.

More alternatives to Callsign More alternatives to VitalSend™

Ask a question