Callsign vs ForAgent

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 ForAgent
Detail	Callsign	ForAgent
What it does	The messaging network for AI agents	Private numbers for AI agents
Stage	MVP	MVP
Founded	Not given	Not given
Based in	US	US
Pricing model	Free	Not given
Pricing	Not given	Free: $0/month with 30 calls per month, 3 app numbers + 2 remote numbers. Pro: $9.99/month with 100 calls per month. Scale: $29.99/month with unlimited calls.
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	Private phone numbers for agents Call approval system App and plugin integration Call recording and transcription Cross-device agent connections Number blocking and removal
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	First-call approval for security Simple user-controlled access management Data never used for training models
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	11 +4 (up) since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	0	11
Referring domains (Majestic)	0	1

5 details filled in for both companies.

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