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Muster vs Castov

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Muster compared with Castov
DetailMuster logo MusterCastov logo Castov
What it doesMac menu bar app that shows which Claude Code, Codex or Cursor session needs you Fast, 100% client-side developer platform with zero-data logging
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelOpen source Free
PricingFree All tools are free with no usage limits. The site may show ads in the future to cover running costs.
Key features
  • See which Claude Code, Codex or Cursor session needs you
  • Allow or deny a command from an alert without switching apps
  • See the agent's reason, the whole command or every option with Option-Down
  • Switch to any session with Option-Tab
  • Search sessions from the last three hours
  • View tokens and API cost per session
  • Native macOS AppKit interface
  • Supports remote sessions over SSH
  • Multi-timezone support with IANA database and daylight saving time
  • JSON to TypeScript conversion
  • JWT decoder and inspection
  • Cron expression parser and generator
  • End-to-end encrypted environment variable vaults
  • P2P multiplayer canvas with WebRTC and CRDT
  • Steganography for hiding encrypted secrets in images
  • Service Worker API mocker for frontend testing
  • Encrypted URL shares with hash fragment storage
What makes it different
  • No switching required to approve requests
  • Open source with full code transparency
  • Privacy by default with no analytics
  • Manage multiple sessions from one menu bar
  • Zero-data logging: no keystroke sent to external servers, all processing in browser memory
  • 100% client-side operation works entirely offline
  • Unified ecosystem across web, CLI, and AI agents via MCP Server
  • Sub-millisecond performance with local execution
  • Tool chaining and piping for seamless multi-stage workflows
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)2 no change since last check1 +1 (up) since last check
Trust Flow (Majestic)31
Citation Flow (Majestic)1819
Referring domains (Majestic)247

5 details filled in for both companies.

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