Mr. Butler is secure chat for your team, your customers and your AI agents, built for GDPR. Every word is end-to-end encrypted and your data stays in the EU by default. The app is free, so you can start talking to your agents the moment it lands on your phone. And we're working hard to put a chat server of your own within easy reach, from as little as €10 a month.
From a single curious mind to a whole enterprise, Mr. Butler meets you exactly where you are. Pick your place at the table and see what's in store.
Download the free app and start talking to your agents straight away.
Open your first room on the shared service in moments and start building right away.
Your team is chatting within a few clicks, with a dedicated installation waiting for the day you outgrow it.
Tell us you're bound by professional secrecy, and we'll talk it through with you before you start.
Tell us about your professionThere's nothing for us to sign. You bring your own box, so we never hold your data or have a way into it. Your agreement is with your hosting provider, and with your AI provider if your agents use one.
Anyone bound by professional secrecy, such as under § 203 of the German Criminal Code. That includes lawyers, notaries, patent attorneys, tax advisors, auditors, doctors and psychologists. Your professional chamber's rules decide the details.
Not for confidential client work. The shared service is for everyone else, and you'll be asked to confirm you're not bound by professional secrecy when you sign up.
An agent reads the rooms it's in and sends what it reads to your AI provider. Germany's bar and tax advisor chambers advise preferring providers in the EU and having a confidentiality agreement with them. You decide which rooms an agent may join.
Ask us on our website, never in the app. Specialized help is booked and paid by the hour, and we agree the confidentiality terms for the visit with you before anyone starts.
Bring a bare-metal server with NVMe storage, run the installer, and you're live in minutes.
Every message is encrypted before it leaves your hand, and it stays that way across the network and on the server. Encryption isn't a switch you have to remember. The whole product is shaped around it.
Sealed the moment you hit send.
Anyone listening in hears only noise.
Its database and backups hold nothing but ciphertext.
Opened only where the people and agents in the room are.
Your data stays where you choose. Your conversations are end-to-end encrypted. You pick where your agents' requests go. And you can take everything with you at any moment.
Built for GDPR, to help you meet your own obligations. Every agent is clearly marked as an agent, your agents speak to the model provider you choose, and you can export everything in the open Matrix format and move elsewhere without switching fees.
Every secure messenger promises privacy. Others let you bolt a bot on from the outside. Mr. Butler builds your own always-on agents right into encrypted rooms, on an open standard, with your data kept in the EU.
| Feature | Mr. Butler | Threema | Signal | Telegram | |
|---|---|---|---|---|---|
| Your own AI agents, built into encrypted roomsBuilt in | YesAlways on, isolated, with the model you choose | PartlyBots you build and host on a paid gateway5 | PartlyBusiness bots, and rival AI assistants only where regulators insist6 | NoUnofficial tools only | PartlyAI bots in any chat, outside end-to-end encryption2 |
| Manage your bots and agents by API, encryption intactBuilt in | YesCreate, configure and steer agents from your own code, inside encrypted rooms | PartlyA paid message API with an end-to-end mode5 | PartlyAn official API, but Meta holds the keys and decrypts for the business7 | NoNo official bot API | PartlyA full Bot API, outside end-to-end encryption2 |
| End-to-end encrypted by default, groups included | Yes | Yes | Yes | Yes | NoOptional, one-to-one only1 |
| Built on an open standard | YesMatrix | NoOpen code, its own network | No | NoOpen code, its own network | NoIts own protocol |
| One app for many servers | Yes | No | No | No | No |
| Runs on your own hardware | Yes | YesOnPrem edition | No | No | No |
| Made for organizations | Yes | YesThreema Work | PartlyBusiness is for customer contact3 | No | PartlyBusiness is for customer contact3 |
| Home jurisdiction | EU | Switzerland | USA4Meta, through WhatsApp Ireland in the EU | USA4 | UAECompany registered in the British Virgin Islands |
| How it's paid for | SubscriptionsThe app is free | App sales and licences | Business messaging fees and adsMeta | Donations and grants | Subscriptions, ads and crypto deals |
Based on public information as of November 2026. The Mr. Butler column describes the platform as it opens to early access. Product names belong to their owners.
The app is made for conversation and nothing else. Encryption, isolation and upkeep are looked after quietly behind the scenes, and agents, keys and members are arranged in a separate web portal. All that's left in the room is the conversation.
A free mobile app that connects to every Matrix server you belong to, with your team and your agents in the very same rooms.
Each one lives in its own isolated space and never clocks off, ready for reminders, scheduled jobs and every question in between.
Bring the key to whichever provider you trust, and choose the mind behind your agents.
Create agents, add credentials and welcome new members, or do every bit of it from your own code through our APIs. Chat never happens here.
Chat infrastructure with agents built in and room for the coding harnesses you already love. Here are a few of the places companies can take it.
Give every customer a private, encrypted line to your business. Configure when your agents greet, answer and assist, from the portal or straight from your own systems through our APIs, and know your team can step into the room at any moment.
Hand every developer an isolated workspace in moments, with Claude Code and other coding agents ready to go. Sign in with an existing subscription or an API key, then direct the work from a chat on your phone.
Weave encrypted conversation into anything you make, from a booking app to an internal tool. No outside messaging service sits in the middle, and your users' words never leave infrastructure that answers to you.
We're still shaping our plans, and we're shaping them around you. The goal is a private, end-to-end encrypted chat server kept in the EU, from as little as €10 a month.
A whole fleet, never a fortune. Bring every colleague and every agent along without the bill climbing into hundreds of euros a month. We aim to please.
The app itself is free, and you'll see every number long before anyone asks you to pay.
Roll in a bare-metal server with NVMe storage, run the installer, and minutes later Mr. Butler is humming away under your own roof. The chat server, the agents, the encryption keys and the backups all live there, and every piece of the infrastructure behind your conversations belongs to you.
Any machine with NVMe storage, in your rack or your data centre.
The chat server, your agents, the keys and the backups settle in.
Your people open the free app, connect and send the first message.
For individuals, builders and startups. A walled-off organization of your own, kept in the EU or in a single country on request, a few clicks away.
We run it for youAn installation reserved for your company alone, in our cloud or in yours.
Only your company insideBring a bare-metal server with NVMe storage and install it yourself in minutes. The chat infrastructure is entirely yours.
You own the infrastructureMr. Butler is an app you'll love using and a platform you'll love building on. Chat runs on Matrix, the open standard for secure messaging, so your own creations can step into the very same encrypted rooms. And on top of Matrix, our APIs open up everything agentic, so your code can bring agents to life, steer them and follow every move they make.
Ready and waiting for your team.
A client, an internal tool or a workflow only you could have dreamed up. Matrix carries the chat and our APIs carry everything agentic.
Everything the web portal can do, plus the agentic features Matrix alone was never built for, within reach of your own software.
Create, configure and steer agents, their credentials and your members from your own code, through the same APIs the portal uses.
A published, versioned description of what agents say in a room, from activity to approvals to transcripts, readable by any Matrix SDK.
Isolated sandboxes for Claude Code and its peers, ready in moments and signed in with your own subscription or an API key.
We're finishing the platform before anyone moves in, so the very first people through the door start on solid ground.
Independent infrastructure in the EU, with security and isolation built into every layer.
The app settles into its new home, focused entirely on conversation.
The first guests arrive. A small group, so we can listen closely.
Everyone is welcome, and your own corner is a few clicks away.
Drop us a line and tell us what you'd do with Mr. Butler, whether that's a private agent of your own, a product built on top or a home on your own hardware. We'll write back before the doors open. There's no sign-up form, so your address goes nowhere else.