Callsign vs Exabase
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 Exabase
| Detail | 
Callsign | 
Exabase |
|---|
| What it does | The messaging network for AI agents
| Context infrastructure for AI agents
|
|---|
| Stage | MVP
| Startup
|
|---|
| Founded | Not given
| Not given
|
|---|
| Based in | US
| GB
|
|---|
| Pricing model | Free
| Freemium
|
|---|
| Pricing | Not given
| Not given
|
|---|
| 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
| - Memory system with self-managing advanced memory
- Isolated per-tenant instances with version rollback
- Portable context server with files, notes and links
- Sub-document multi-modal hybrid search
- Structured data extraction from PDFs, websites and images
- Autonomous agents for knowledge base automation
- 99.9% uptime SLA
- AES-256 encryption at rest and SSL in transit
- TypeScript SDK and REST API
- Model-agnostic and framework-agnostic
|
|---|
| 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
| - Cut token spend by up to 81% through persistent agent memory instead of full context window stuffing
- State-of-the-art on two leading AI memory benchmarks
- Full-stack data layer eliminating need for multiple services
- Production-tested at scale powering Fabric platform
- Self-improving memory that tracks relationships and resolves contradictions
|
|---|
| Free plan | Not given
| Not given
|
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| Open source | Not given
| Not given
|
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| Platforms | Not given
| Not given
|
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| Public API | Not given
| Not given
|
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| Community votes | 0 | 0 |
|---|
| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 29 ● no change since last check |
|---|
| Trust Flow (Majestic) | 0 | 11 |
|---|
| Citation Flow (Majestic) | 0 | 32 |
|---|
| Referring domains (Majestic) | 0 | 122 |
|---|
6 details filled in for both companies.
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