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HazelJS vs Shark Magic

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

HazelJS compared with Shark Magic
DetailHazelJS logo HazelJS Shark Magic
What it doesOpen-source Agent OS for TypeScript that helps teams operate AI agents like production systems Serverless sandboxes that bill only for the seconds your agent's code runs
StageNot given MVP
FoundedNot given Not given
Based inNot given MX
Pricing modelOpen source Freemium
PricingNot given Shark Pro $5/month includes $5 of usage; Shark Studio $25/month includes $25; Shark Scale $100/month includes $100. Commands run at $0.12 per compute-hour, billed per second only while running. Services: 2 vCPU / 2 GiB at $0.03/h; 4 vCPU / 4 GiB at $0.06/h. Storage $0.08/GiB-month with first 5 GiB f
Key features
  • Durable execution with crash-safe HITL
  • Agent DNA for versioning agents as packages
  • Gatekeeper default-deny authorization
  • Skillgate capability curation
  • Local-first deployment without Kubernetes requirement
  • Agent VM with effect typing and speculation
  • Decision Runtime for bounded closed-set judgment
  • Organism for multi-agent coordination
  • Persistent Space for agent files and databases
  • Pay only for compute time while command runs, not idle or thinking time
  • HTTP API with Python and TypeScript SDKs
  • CLI for devbox with Claude Code and Codex support
  • Sleeping services that wake in milliseconds
  • Fork Spaces fast without booting VM
  • API key isolation outside VM with egress proxy
  • Fast file search with sharkfn 300–600× faster than ripgrep
  • Integration with LangChain, LangGraph, smolagents, and Prefect
What makes it different
  • Agents live in the same TypeScript DI app as your APIs, not as separate services
  • Production-ready without cloud or Kubernetes dependency
  • Complete operating system, not glue between frameworks
  • Agents pause, resume, and survive restarts in production
  • Developer-first with decorators and DI patterns developers already know
  • Billing only for seconds code actually runs, not idle or thinking time
  • Lowest cost compared to alternatives for agent infrastructure
  • Persistent Storage with fast Space fork and file access without VM boot
  • No GPU required, works with unmodified existing agent harnesses
  • Sleeping services wake in milliseconds with zero idle billing
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)7 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)30
Citation Flow (Majestic)230
Referring domains (Majestic)180

4 details filled in for both companies.

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