A2A Open Protocol — the open standard for AI agent communication

Deployed your agent. Now what?

Chat with every AI agent
you deploy, wherever it lives.

Q: Do I need to build anything to use AgentChat Hub?

No. If you already have an A2A-compatible agent endpoint, you just paste the URL and start chatting. If you want to connect your own agent, you only need to expose an A2A endpoint and a discovery file. No SDK, no API key, no custom frontend required.

Q: What AI agents work with AgentChat Hub?

Any agent implementing the A2A specification — including agents built with LangChain, CrewAI, custom Python or Node.js servers, locally-run models wrapped in an A2A layer, and internal company agents. If it publishes an Agent Card at /.well-known/agent.json, AgentChat Hub can connect to it.

Paste any A2A endpoint and you're chatting in seconds. No middleman, no account, no tracking — your conversations never leave your device. Native on iPhone, iPad, Mac, and Vision Pro. Free forever.

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

No wrappers. No middleware.
Just the agent.

Any endpoint, instantly

Paste your agent's URL. The app fetches the Agent Card and you're chatting. No approval process, no marketplace, no waiting — just your URL. Railway, Vercel, Fly, Render, Cloudflare — it doesn't matter where your agent lives.

my-agent.up.railway.app/.well-known/agent.json agent connected

Watch your agent think

Responses stream token by token. Catch a wrong turn early, redirect mid-thought, or just watch it reason. No spinner. No wall of text.

› analysing request...

› generating response

› streaming tokens▋

Send files, not descriptions

Send files to your AI agent directly in the conversation — drop photos, images, and documents inline. Your agent sees exactly what you're looking at. No upload flows, no copy-pasting context.

Organized around how you work

Create custom groups for any workflow — name them anything, then drop your agents in. The right agent is always one tap away, never buried in a list.

Work Marketing Content Creation Data Extraction Research + anything you name

All your agents, one place

Every agent you build, discover, or run — all in one app. No juggling tabs, no hunting through bookmarks. AgentChat Hub is the single place you go to talk to any agent, for any purpose, on any hosting platform.

The App

The app your agents have been missing.

Light or dark — it follows your lead. Built natively for iPhone, iPad, Mac, and Vision Pro. Every screen designed for the device it runs on.

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

Any agent.
Any purpose.

Research. Code review. Finance. Content creation. Data extraction. Customer support. Document analysis. Whatever the agent does — if it speaks A2A, this is where you talk to it. The use cases are only as limited as what the world builds.

Developers

Test any agent you build

Point AgentChat at your endpoint the moment your agent is live. No frontend to build, no demo environment — paste the URL and go. Works on day one of every project.

Research & knowledge

Query any knowledge agent

Ask questions, run analysis, pull from your data pipelines — from your phone, wherever you are.

Teams & orgs

Internal tools, no frontend

Ship internal agents to your team without building a client. AgentChat is already the client.

And everything else

Finance. Content. Support. Data. Whatever comes next.

The A2A protocol is open. Agents can be built for anything. AgentChat Hub is the one client that works with all of them — today and every agent you haven't built yet.

∞

Research Agent Code Reviewer Financial Analyst Content Writer Data Extractor Customer Support Email Drafter Document Summariser SQL Agent Calendar Manager Marketing Analyst Local LLM PR Reviewer + anything you build

FAQ

Questions worth answering.

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.

05 Do I need to build anything to use it?

No. If you already have an A2A-compatible agent endpoint — or you find one on the open web — you just paste the URL and start chatting. If you want to connect your own agent, you only need to expose an A2A endpoint and a discovery file. No SDK, no API key, no custom frontend to build.

06 What AI agents work with AgentChat Hub?

Any agent that implements the A2A specification and exposes an endpoint — including agents built with LangChain, CrewAI, custom Python or Node.js servers, locally-run models wrapped in an A2A layer, and any internal company agent. If it publishes an Agent Card, AgentChat Hub can connect to it.

07 Is AgentChat Hub available on Android?

Not yet — but Android is coming soon. AgentChat Hub is currently available as a native app on iPhone, iPad, Mac, and Vision Pro. Stay tuned for the Android release.

08 Is AgentChat Hub a privacy-focused AI chat app?

Yes. AgentChat Hub has no backend, no analytics, and no telemetry. Messages travel directly from your device to your AI agent — nothing passes through our servers. Conversations are stored on-device only. No data is collected, shared, or sold. Privacy is not a setting you toggle; it is the default architecture.

09 Can I send files to my AI agent?

Yes. You can send files to your AI agent directly from any conversation in AgentChat Hub — photos, images, and documents drop in inline. Your agent receives the actual file, not a description of it. No separate upload flow, no copy-pasting. Multimodal support is built in from the start.

10 How does AgentChat Hub compare to other AI chat clients?

Most AI chat apps lock you into one provider's model. AgentChat Hub connects to any A2A-compatible agent via URL — you bring the agent, it brings the interface. No curated marketplace, no vendor lock-in. Key differentiators: works with any self-hosted or third-party A2A agent, real-time SSE token streaming, file attachments, no account required, zero data collection, native binary on iPhone, iPad, Mac, and Vision Pro.

research.up.railway.app/.well-known/agent.json code-bot.onrender.com/.well-known/agent.json finance.fly.dev/.well-known/agent.json email-agent.onrender.com/.well-known/agent.json weather.up.railway.app/.well-known/agent.json data-pipeline.fly.dev/.well-known/agent.json vision-model.onrender.com/.well-known/agent.json

One app for every AI agent
you'll ever use.

Start for free. No account. Works with any A2A agent. Available now on the App Store.

Download on the App Store

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

Using AgentChat Hub? Share your experience

Chat with every AI agent you deploy, wherever it lives.

No wrappers. No middleware.Just the agent.