A2A Open Protocol

Talk to any AI agent
with a URL.

The universal A2A client for iOS, Mac, and Vision Pro. Paste an endpoint, stream responses in real time. No account. No tracking. Free.

Download on the App Store v1.1 · Free · No account required

Native on iPhone, iPad, Mac, Vision Pro iOS 15.1+ macOS 12+ visionOS 1.0+

AgentChat Hub

iPhone · iPad · Mac · Vision Pro One native binary per platform A2A Open Protocol compatible

Features

A native client that speaks
the open protocol.

Live Streaming

Every response arrives token-by-token over SSE. You watch the agent reason in real time — not a loading spinner followed by a wall of text. Latency becomes visible instead of hidden.

streaming

Connect by URL

No marketplace. Paste the endpoint, the app reads the Agent Card. The open web is the platform.

Multi-Agent Roster

Add unlimited agents. Organize into groups and tabs. Switch between them like contacts in a messenger.

Rich Attachments

Send photos, images, and files inline. Multi-modal from day one.

Native Everywhere

iPhone, iPad, Mac, Vision Pro. One native binary per platform, not a web view. Platform idioms, system fonts, keyboard shortcuts — it all works because it was built to.

The App

Every screen, natively built.

Light and dark modes. iPhone, iPad, Mac, Vision Pro. One app that feels at home everywhere Apple is.

Protocol

Three steps.
Zero ceremony.

If it publishes A2A metadata, AgentChat can talk to it. That is the entire integration surface.

Step one

Publish agent metadata

Host an Agent Card so any client can discover your capabilities without manual configuration.

/.well-known/agent.json

Step two

Paste the URL

AgentChat reads the Agent Card, discovers the endpoint, and establishes a session. No SDK. No API key. No setup ritual.

Step three

Start chatting

Stream responses, send files, manage conversations. Everything stays on your device — no cloud in the middle.

Privacy

Zero data collection.
By design.

bytes collected

accounts needed

∞

devices you own

price forever

privacy audit

data_collected	none
data_shared	none
account_required	false
cloud_sync	false
advertising	false
price	0.00

Use cases

Built for anyone
with an agent.

Developers

Building A2A agents

Test and demo your agent instantly. No frontend to build — point AgentChat at your endpoint and go. Ship faster, iterate in real time.

Teams

Internal AI assistants

Give your team a native mobile client for internal agents — no bespoke frontend required.

Self-hosters

Local models

Wrap your local LLM in an A2A endpoint and chat from your phone. No port forwarding theatrics.

Everyone

Private chat client

No logins, no data collection, no subscription walls. A clean messenger for the agents you actually choose.

FAQ

Good questions.

01 What is the A2A protocol?

A2A (Agent-to-Agent) is an open interoperability protocol that lets AI agents communicate across platforms using a standard HTTP interface. Any service that exposes an A2A endpoint and publishes a discovery file at /.well-known/agent.json is automatically compatible with AgentChat Hub.

02 Which agents can I connect to?

Any agent that implements the A2A specification — ones you build yourself, internal company agents, or any third-party service exposing a standard A2A endpoint. There is no curated marketplace. The open web is the directory.

03 Is AgentChat Hub really free?

Yes. No subscription, no in-app purchases, no freemium gate. The app is free on the App Store. You pay the agent providers you connect to directly — that's between you and them.

04 Does AgentChat see my conversation data?

No. AgentChat Hub has no backend, no telemetry, and no analytics. Messages travel directly from your device to your chosen agent — we are not in that path. Conversations are stored on-device and nowhere else.

The open AI web needs
an open client.

Free. No account. No tracking. Available now.

Download on the App Store

v1.1 / iOS 15.1+ / macOS 12+ / visionOS 1.0+

Talk to any AI agent with a URL.

A native client that speaksthe open protocol.