Sandbox0 vs openagent.email

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

Sandbox0 compared with openagent.email
Detail	Sandbox0	openagent.email
What it does	Cloud agent sandbox with persistent filesystem and on-demand compute	Self-hosted email and task handoffs for AI agents with no vendor control plane
Stage	MVP	Not given
Founded	Not given	Not given
Based in	US	Not given
Pricing model	Paid	Open source
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	Self-hosted is free under Apache-2.0 license (pay only for VPS infrastructure ~$5/month and domain ~$10/year). Hosted Pro Early Bird: $30.00/year one-time payment, no auto-renewal.
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	MCP 2026-07-28 support for Claude, Cursor, Kimi Code and other clients Unlimited agent mailboxes on your own domain Email-backed agent-to-agent task threads with stamped states
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	Apache-2.0 open source with no vendor control plane or per-inbox software fees Mail stays on your server under your control unless you explicitly opt into external services Built-in OTP extraction tested against real services from US and Chinese providers
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	16 +1 (up) since last check	4 −1 (down) since last check
Trust Flow (Majestic)	5	3
Citation Flow (Majestic)	21	26
Referring domains (Majestic)	17	28

5 details filled in for both companies.

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