Minds together
Your firm knows more than it can find.
A shared workspace for your team's notes and files. Today it sits in heads, inboxes and one person's laptop, where your team and your AI can't reach it. synoia gives it one home you own, shared with exactly the people and partner firms you choose, hosted in the UK. Start from a ready-made structure.
Try it on your own computer with no account. Every plan you can buy online starts with a 14-day free trial.
- Files you own
- Hosted in the UK
- Bring your own AI
- macOS and Windows
Why it matters
Where your firm's knowledge goes
Knowledge lives in heads and inboxes
When someone is busy, on leave or moves on, what they knew goes with them. The next bid starts from a blank page.
Your AI can't see your firm's notes
It can draft and search, but it can't reach the notes on a colleague's laptop. So you paste the context in by hand, every time.
Sharing with a partner means sharing everything
Most tools give a guest the whole space or nothing. Either the partner can't see what they need, or they see too much.
Get it in one place and the next bid starts from what the firm already knows, with your AI working from it too. Leave it and you keep paying to learn the same things twice.
It started on a drive. Our founder wanted to ask an AI about the firm's notes by voice and have it file what was said. It could already reach email and calendar. It couldn't reach the notes, which sat in a folder on one laptop. synoia is what we built to fix that.
Bring your own AI
Say it to your AI. It lands as a note.
Connect Claude, ChatGPT or any MCP client. It files, links and finds notes for you, saved in your name and only where you could have written yourself.
The idea
AI is only as good as the context you give it. synoia is where your team's context lives, inside a boundary you can explain.
A second brain is what your firm knows, written down: methods, bids, client context, lessons learned. Linked, and findable by your people and your AI. synoia holds it once for the whole firm, and you set who sees each part, so each person, team and partner firm gets the knowledge meant for them.
synoia is said “sin-OY-a”, from the Greek syn, together, and nous, mind.
Files you own
Every channel is an ordinary folder of files on your computer. Open it in Obsidian or any editor and everything is there.
One live copy for the team
Edits sync through our service in London as you type, and you can see who else is in a note.
Your AI, your permissions
Connect Claude, ChatGPT or any MCP client. It reads and writes what you can, and nothing else. synoia runs no AI of its own.
The app
Everything the firm knows, in one place.
Channels for client work, the handbook and what you share with partners. Edit together live, and see who else is in the note.
One home for what the firm knows.
Channels for client work, the handbook, and what you share with partners.
Write it down once.
Links, tags and checklists, saved as files on your own computer.
Tom is here too.
Edits sync through London as you type. You can see who else is in the note.
Your AI, inside your permissions.
It reads what you can, writes in your name, and every write is logged.
In 30 seconds
Write, work together, ask, share, leave.
The whole product in five short chapters. Pick any one to jump to it.
Your AI, your permissions
Your AI sees only what you can.
Pick a person and the channel redraws with only what they can open. Priya's AI sees exactly what Priya sees, and nothing more.
Who it's for
For teams where privacy, ownership and security matter.
Firms that hold their clients' knowledge and have to say where it lives. Defence and regulated firms are among them, and so is any team that would rather own its notes than rent them.
You answer to clients
Someone will ask where your knowledge is kept and who can see it. You want a one-sentence answer.
You use AI every day
You want it working over the team's shared notes, and seeing no further than the person who asked.
You work with partners
You need to share some things with people outside the firm and keep the rest to yourselves.
You like Obsidian
You want the same plain files and links, with your whole team in them at once.
Coming from Obsidian?
Keep what you like about it.
Your Obsidian vault becomes a synoia channel. It stays a folder of the same notes and links, and Obsidian still opens it. What synoia adds: your team in the same notes at once, a folder or a single note shared with only the people who need it, partner firms as guests, and your AI reaching the shared notes within your permissions.
Planned Bringing an existing Obsidian vault into your workspace from the app is being built now.
Across firms
Work with other firms without exposing the rest.
Why share any of it? You share only what you choose, down to a single note, and you can take it back in one step. What you share is there for colleagues and partners to build on, and for their AI to use without you pasting it in. Everything else stays yours.
Share a channel, a folder or a single note with a partner firm, and take it back in one step. Your admin decides which firms you connect with. You choose what to share within that.
One sign-in for every firm you work with
One sign-in for your own firm and every client or partner space you're invited into.
The right knowledge to the right people
Restrict a folder to the people who need it. A guest sees the channels they're invited to, never the rest of your workspace.
- Calder workshop, 16 SeptemberDelivery team
- Calder risksDelivery team
- ProposalsRestricted
- Market signalsEveryone
- Fee model 2026Partners
- Calder site surveyHarbour only
- Shift patterns, draftHarbour only
Planned Today, people from a partner firm join as guests. Connections between firms, approved by each firm's admin, are planned.
Where synoia is heading
Second brains, connected note by note.
Every firm keeps its own second brain. Share a single note with a partner or a client and the two connect at exactly that note, and nowhere else. Hover a firm to see who it works with.
Getting started
Useful from day one.
Create a channel from a template: a founder's small-business structure to start, with more to follow. Use it straight away, or paste one prompt into your AI to tailor it.
Step 1
Pick a template
Name the channel, choose where it lives, and start from a proven folder structure with guides built in.
Step 2
Use it straight away
It works for people from the first minute. Connecting AI is optional.
Step 3, if you like
Let your AI tailor it
Paste one prompt into the AI you use, and it renames and shapes the channel to fit your firm.
Planned Templates are being built now.
How it works
Everyone keeps a copy. One service keeps them in step.
Notes are files
Each person's computer holds the channel as a folder of ordinary files. The app works on those files directly. Edit them in Obsidian too: while the synoia app is open, your changes sync like any other.
The service keeps everyone in step
Edits travel through our service in London. If you work offline, what you wrote is sent when you reconnect, and every device ends up with the same document.
You choose who sees what
Share a channel, a folder or a single note with people, teams or guests. Restrict a folder to the people who need it. A picture has the access of the folder it sits in.
Your AI works inside your permissions
Connect your own AI. It can write wherever you can. Every write is saved in your name, checked against the latest version of the note, and logged.
Straight answers
What we claim, and what we don't.
Written for the person who has to answer a client's security questions. If something isn't true yet, we say so.
We claim
- Your notes are plain files on your computers, and you can leave with them.
- The service runs on AWS in London, behind Cloudflare. Backups are encrypted and kept for 35 days.
- Sign-in is Google or Microsoft only. There are no passwords.
- Your AI reaches only what you can. Its writes are saved in your name and logged.
- synoia runs no AI model. You connect your own.
We don't claim
- Sovereign AI. What your AI reads goes to your AI provider, under your terms with them.
- That we can't read your notes. Our staff don't, but the service can technically read what it stores, and we won't pretend otherwise.
- A certification or an independent penetration test for synoia. Neither has happened yet.
- That it suits material a contract or a client requires you to keep off commercial cloud services.
What you get
The core of a second brain, built for a team.
Write and link
An editor that formats as you type, with links between notes, tags, checklists, tables and diagrams.
Find and connect
Backlinks, full-text search and a graph of how your notes connect. The graph also works from the keyboard.
Version history
Notes keep their earlier versions, so you can get back what changed.
Workspaces, channels and guests
It works like Slack: a workspace for your firm, channels inside it, and guests from partner firms. One sign-in reaches every channel you belong to.
Google or Microsoft sign-in
No passwords to leak. An account can do nothing until it holds a plan or is invited into a workspace.
Leave whenever you like
A channel removed from synoia stays a folder of ordinary files on your computer. Obsidian, or any text editor, opens it.
Who runs it
A UK company you can name and call.
Run by MilUX, a defence and security company with seven years in the sector and security-cleared people. We built synoia because we needed it ourselves.
Where it runs
UK-hosted on AWS London as standard. A dedicated server for your organisation, or one on your own premises, is available on request.
If synoia ever stopped
Every channel is still a working folder of files on your computers. Nothing is locked in.
Pricing
Simple pricing based on the size of your organisation.
Choose by the number of people and the storage you need. Every plan has the full product.
Free trial
14 days free
On Founder, Team and Company, and the personal plan.
- Stripe takes your card when the trial starts
- Nothing is charged until it ends
- Cancel before then and you pay nothing
Founder
£10 a month
For companies just getting started.
- 1 to 3 people
- 1 GB knowledge storage
- 2 workspaces
Team
£79 a month
For small professional teams.
- Up to 10 people
- 5 GB knowledge storage
- 5 workspaces
Company
£199 a month
For growing firms.
- Up to 30 people
- 20 GB knowledge storage
- 10 workspaces
Scale
From £499 a month
For larger organisations.
- 30 or more people
- From 50 GB knowledge storage
- 20 workspaces
Founder, Team and Company each start with a 14-day free trial. Prices exclude VAT.
On the waitlist before 24 October 2026? Your 20% off the first 12 months still stands. See the waitlist offer.
Compared with what you use now
Personal tools don't share well. Shared tools keep your knowledge on their terms.
Personal note apps
Yours, but mostly solo
Obsidian gives one person a superb second brain. Its shared vaults give everyone the same rights to all of it, for up to 20 people, and two people can't edit a note at the same time.
Cloud workspaces
Shared, but in their format
Notion and Confluence are built for teams. Your pages live in the vendor's own format, usually in the vendor's cloud.
Document libraries
Approved, but made for documents
SharePoint and Kahootz hold documents well. In our experience, the notes, decisions and links between them end up somewhere else.
synoia keeps the files on your computers and shares them live with the people you choose. Each person's AI works inside the same boundary.
Side by side, including where the other tool wins
Each comparison says where the other tool is the better choice. For some teams it is.
Give your team one shared mind.
Try synoia on your own computer, then start a free trial when you're ready to share it with your team.