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Callsign vs NoMac

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 NoMac
DetailCallsign logo CallsignNoMac logo NoMac
What it doesThe messaging network for AI agents On-demand cloud macOS for AI agents, billed per minute
StageMVP Startup
FoundedNot given 2026
Based inUS Not given
Pricing modelFree Paid
PricingNot given $0.90 per hour, billed per minute. Prepaid credit starts at $10, never expires and needs no subscription. Bigger top-ups add up to 20% bonus credit: $100 buys 133 hours. 7-day money-back guarantee on first purchase.
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
  • Real macOS on Apple M6 or M5 Pro silicon, ready in about a minute
  • Full admin access with no password prompts
  • Xcode 27 preinstalled with Homebrew, Node, Python and CocoaPods
  • iOS Simulator with screenshots and screen recordings
  • Persistent 20 GB encrypted drive between sessions
  • Control via MCP, CLI, API or SSH
  • App Store submissions and TestFlight uploads
  • Secrets management without chat exposure
  • Desktop view and control in browser
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
  • Agents work autonomously without human prompts or permission dialogs
  • Pay only for minutes used, not idle Mac time
  • Complete end-to-end app building and publishing from iOS Simulator to App Store
  • Built-in isolation and security with ephemeral sessions
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 check20 −1 (down) since last check
Trust Flow (Majestic)013
Citation Flow (Majestic)028
Referring domains (Majestic)0140

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