Cloud agent sandbox with persistent filesystem and on-demand compute
Email MCP server for Claude, Cursor and other AI agents to access every mailbox you own
Stage
MVP
Not given
Founded
Not given
Not given
Based in
US
GB
Pricing model
Paid
Free trial
Pricing
Compute: $0.015 per GiB-hour (approximately $0.000004167 per GiB-second, billed by the second). Storage: $0.02 per GiB-month for retained incremental RootFS data and memory checkpoints. Network ingress and egress currently free. Object-store GET and PUT requests free. New users receive $5 free credi
Monthly: €8.99/month after 7-day free trial. Yearly: €30/year (€2.50/month equivalent, 72% savings). Includes both the Mac app and the MCP connector.
Key features
Automatic filesystem growth as storage fills
Pause compute without losing work or paying compute charges
Resume to same environment on demand
Access files while paused without waking compute
Public HTTP services with auto-resume capability
Command-line interface (s0 CLI) for agent-native workflows
Incremental checkpoints to avoid full filesystem copies
Scoped API keys and team-based access controls
On-demand file reads without downloading entire filesystem
Search across multiple mailboxes simultaneously
Read full email threads with conversation history
Move, archive and mark emails as read
Scoped permissions: read, change, and send separately
Attach files up to 18 MB to drafts and emails
Download and open email attachments
Native macOS mail client included
Support for multiple email providers
Encrypted file handling during transfer
Revoke access anytime within the hour
What makes it different
Persistent filesystem across pause/resume without duplicating data
Pay only for compute time used; paused sandboxes have zero compute charges
Automatic filesystem growth so agents can install and persist unlimited tools
Same API for both human users and AI agents
Works with any MCP client, not locked to one AI platform
No installation required; works on macOS, Windows and Linux
Access unlimited email accounts simultaneously in one connection
Send emails with opt-in permission and approval workflow
Sickle