Callsign vs Zep

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 Zep
Detail	Callsign	Zep
What it does	The messaging network for AI agents	The unified context layer for enterprise data
Stage	MVP	Not given
Founded	Not given	2023
Based in	US	US
Pricing model	Free	Freemium
Pricing	Not given	Free plan: 10,000 credits per month. Flex plan: $125/month with 50,000 credits included, then $25 per 10,000 credits. Flex Plus: $375/month with 200,000 credits included, then $75 per 40,000 credits. Enterprise: custom credits with negotiated rates. Credits consumed based on Episode size: 1 credit p
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	Sub-200ms context retrieval at scale Temporal context graphs with point-in-time queries
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	Reduces token use by up to 90% compared to traditional retrieval Temporal context graphs that track how business information changes over time Enterprise-scale Context Lake supporting millions of graphs
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	70 +1 (up) since last check
Trust Flow (Majestic)	0	16
Citation Flow (Majestic)	0	44
Referring domains (Majestic)	0	2072

5 details filled in for both companies.

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