Pre-alpha. Our pilot program is open, free for one month.Join

It does the ordinary work, and asks first about the rest.

Arca is an AI agent and email assistant that works your inbox, calendar and files from your own machine. Routine work it just does. Anything outward or destructive waits for your yes.

Join our pilot program See where the line sits

Activity log

Today

08:14actedTriaged 23 new messagesGmail
08:11waitingAsked before inviting a guest to ThursdayCalendar
08:09refusedRefused a recipient outside the allowlistGmail
08:06actedFiled invoice 4417 into AccountsNotion
08:02actedDrafted a reply to Beth, left in DraftsGmail
07:58actedRenamed 6 files into the right foldersDrive

Approval needed

Send reply to beth@northgate-legal.example

Subject: Re: completion date

Hi Beth, the completion date on the Hartley file is Friday the 9th. I'll send the signed pack over on Thursday.

Nothing leaves this machine until you answer. No answer is a no.

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Datadog
Laravel Cloud
Deepgram
NVIDIA
PostHog
AssemblyAI
Aiven
Qdrant
Customer.io
Composio

See all partners

1,553 apps through Composio

Works inside the tools your team already uses

Gmail

Google Calendar

Google Drive

Google Sheets

Slack

Notion

Outlook

HubSpot

Linear

GitHub

Where the line sits.

Reversible, private work goes straight through. Anything outward or destructive stops at an approval card. The gate is enforced in the code that calls the tools, not requested in a prompt.

Triages the inbox

Reads, classifies and sorts what arrives. Done on its own.

Finds the file

Tracks down the document behind “which one was it?” Done on its own.

Writes the draft

Leaves the reply in Drafts for you to read. Done on its own.

Files and renames

Notes into Notion, files into the right folders. Done on its own.

Sending waits

Anything addressed to another human being waits for your yes.

Shared events wait

Creating or moving an event other people can see waits for you.

Binning waits

Deleting or moving a file never happens without approval.

Injected orders stop

Instructions it didn’t get from you become a card, not an action.

passing

898

automated tests, including attacks on our own gate

as little as

1,147

from your yes to a sent email

reaches

1.5

apps through Composio, behind the same gate

pilot for

employees in total, free for one month

Simple pricing, per seat.

We’re looking for companies totaling 25 employees to test Arca free for one month. You won’t pay anything.

Team

For small teams that want the routine work done and every outward step checked.

$150

per seat per monthfor 1 to 10 people

Join our pilot program

Each person using Arca is one seat.

Up to 10 seats
Inbox, calendar and files
The full autonomy dial
Every outward step waits for your yes

Business

For growing teams with more mail, more meetings and more files to keep in order.

$250

per seat per monthfor 11 to 50 people

Join our pilot program

Each person using Arca is one seat.

Up to 50 seats
Everything in Team
An onboarding call with the founders
Help connecting your tools

Enterprise

For organisations of more than 50 people that need a rollout planned around them.

Custom

Join our pilot program

A per-seat price agreed with you, above 50 seats.

More than 50 seats
Everything in Business
A rollout planned with your team
Contract and invoicing to suit you

Questions and Answers

Is Slack connected yet?

Reading, yes. It reads the channels it is invited to and classifies what arrives. Posting is built and turned off: it needs a Slack app of your own, and it is gated exactly like email. Gmail, Calendar, Drive, Docs, Sheets, Tasks, Contacts, Notion and OneDrive work alongside it.

Can I use Arca from Claude Desktop or Cursor?

Yes. Arca runs as an MCP server, so its tools appear inside whichever client you already use. It is read-only there unless you start it with a different agent, because that connection has no approval prompt.

How is this different from an assistant that just does things?

Confidence gating, enforced in the code that calls the tools rather than requested in a prompt the model can talk itself out of.

What happens if the AI gets something wrong?

Nothing, until you approve it. Decline and the work is kept as a draft. Walk away and the action declines itself.

Can a malicious message make Arca do something bad?

Prompt injection is our central design constraint, not a footnote. Incoming content reaches the model as data, and even a fooled model cannot send, move or bin anything without a human pressing yes.

Why can’t Google or Microsoft just do this?

They can build the features. They cannot make the promise, because their business needs your data on their servers.

When can I use it, and what does it cost?

Now, through our pilot program. We’re looking for companies totaling 25 employees to test Arca free for one month. You won’t pay anything. After that, it’s $150 per seat a month for teams of 1 to 10 people, $250 per seat a month for 11 to 50, and an enterprise plan for more than 50.

Join our pilot program. The first month is free.

We’re looking for companies totaling 25 employees to test Arca free for one month. You won’t pay anything. We want honest feedback, and we read every reply.

Join our pilot program Log in