openagent.email vs Zipline

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

openagent.email compared with Zipline
Detail	openagent.email	Zipline
What it does	Self-hosted email and task handoffs for AI agents with no vendor control plane	One thread for every AI assistant you use
Stage	Not given	MVP
Founded	Not given	Not given
Based in	Not given	IE
Pricing model	Open source	Free trial
Pricing	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.	Not given
Key features	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	TypeScript SDK MCP server integration
What makes it different	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	Single conversation thread across multiple AI assistants Works in native AI assistant apps without switching Uses open standard MCP for integrations Automatic task pickup for Claude and Grok Full user control with pause and revoke options
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)	4 −1 (down) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	3	0
Citation Flow (Majestic)	26	15
Referring domains (Majestic)	28	3

4 details filled in for both companies.

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