Skip to main content
NexoraLaunch home

Build log live

Callsign vs Nysa

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 Nysa
DetailCallsign logo CallsignNysa logo Nysa
What it doesThe messaging network for AI agents Shared memory for regulated companies and their AI agents
StageMVP Not given
FoundedNot given Not given
Based inUS US
Pricing modelFree Freemium
PricingNot given Team plan: $10/person/month with 14-day free trial, includes meeting recording, email and calendar enrichment, knowledge organized by topic, private scopes and projects, agent keys with custom permissions, import existing brain, and MCP for all agents. Enterprise plan: custom pricing for regulated a
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
  • Records and transcribes meetings with visible participant
  • Automatically extracts facts from email and calendar
  • Scoped access control with automatic sorting
  • Private projects limited to members
  • Agent API keys with read-only or read-write permissions
  • Works with Claude, ChatGPT, Cursor, Codex over MCP
  • Import existing brain from markdown, Obsidian, or GBrain
  • Facts organized by topic with full history
  • Raw email stays private to owner, team sees extracted facts only
  • 180 days of email history imported on day one
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
  • Every fact is scoped automatically by sensitivity level and agents see only what their teammate can access
  • Agents can write back to the same brain over MCP, updating shared knowledge in real time
  • CASA Tier 2 security assessed and verified by Google for Gmail and Calendar access
  • Onboard entire team in under 5 minutes with one-click Google sign-in
  • Data never used to train AI models, privacy verified in policy
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 check2 −1 (down) since last check
Trust Flow (Majestic)09
Citation Flow (Majestic)026
Referring domains (Majestic)032

5 details filled in for both companies.

More alternatives to Callsign More alternatives to Nysa

Ask a question