openagent.email vs Cogni

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 Cogni
Detail	openagent.email	Cogni
What it does	Self-hosted email and task handoffs for AI agents with no vendor control plane	Memory that reasons
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Open source	Freemium
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.	Free plan at $0 USD; Pro plan at $5 USD per month.
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	Entity-graph spreading activation for cross-vocabulary retrieval Works with any LLM model No LLM or GPU in retrieval path Point-in-time and windowed recall Timestamped memories Fixed recall cost as memory grows
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	Reaches answers across unrelated documents that share no keywords, where vector search scores zero Deterministic retrieval with no model in the path, so results never vary between queries Constant per-query cost regardless of memory size, even at 32,000 words No infrastructure to run—no vector database, cluster, or GPU needed Works with any model, so small local models gain the most from better retrieval
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	4 no change since last check
Trust Flow (Majestic)	3	2
Citation Flow (Majestic)	26	21
Referring domains (Majestic)	28	34

5 details filled in for both companies.

More alternatives to openagent.email More alternatives to Cogni