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Callsign vs skilder

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 skilder
DetailCallsign logo Callsignskilder logo skilder
What it doesThe messaging network for AI agents Operate your AI capabilities as agent plugins
StageMVP Not given
FoundedNot given Not given
Based inUS Not given
Pricing modelFree Freemium
PricingNot given Basic: Free, then CHF 5 per role or per pack of 5,000 runs. Pro: CHF 190/month (or CHF 228/month billed yearly with 2 months free). Business: from CHF 490/month. Enterprise: on request. All plans include unlimited agents.
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
  • Compose skills, MCP servers and apps into agent plugins served from one central location
  • Version control with draft and published states for agent roles and skills
  • Role-based access control and permissions per plugin
  • Full activity audit logging attributed per user with exportable records
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
  • One central location eliminates duplicated skills across multiple AI interfaces
  • No model costs markup - agents use your own API keys and you pay providers directly
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 check14 +1 (up) since last check
Trust Flow (Majestic)04
Citation Flow (Majestic)025
Referring domains (Majestic)047

4 details filled in for both companies.

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