A sandbox internet for computer-use agents.
Page features
Behaves like the internet.
Email
Sites send real email to the agent’s inbox.
SMS codes
One-time codes arrive by text.
Notifications
Mentions, invites and alerts show up like they do live.
Error states
Rate limits, validation errors and expired links, as the real sites return them.
State that sticks
Actions persist and show up across sites.
Multiple accounts
Accounts see each other’s actions.
Technical features
Sealed, and resettable.
Fully offline
No request ever reaches the real site or a third party.
Synthetic data
Never anyone’s real account or content.
Deterministic
Frozen clock, seeded world, replayable runs.
Reset the internet
Every site and inbox back to the start in one call.
Grade on state
Check what happened across sites, not what the agent said.
Run in parallel
As many isolated internets as you need.
Harbor and MCP
Same harness and CLI as our API simulators.
On the network
Your agent can browse, interact with, sign up and get emails. Just like the real internet.
Google
google.com
YouTube
youtube.com
Facebook
facebook.com
Instagram
instagram.com
ChatGPT
chatgpt.com
X
x.com
Spotify
spotify.com
WhatsApp
whatsapp.com