Connectors

Kastel plugs into what you already use. Not the other way around.

55 connectors already ship with the engine: email, CRM, project management, HR, finance, e-signature. The MCP protocol plugs in directly to everything else. You choose what to turn on, and you decide what each AI has the right to see.

Read the connection guide Request a connector

The catalogue

52 tools, organised by use.

Every connector respects the access rights already in place on the connected account: Kastel only reads what that account can already see.

The most sensitive categories, HR, finance and e-signature, never expose more than metadata: never payroll, bank details, or the content of a signed document.

Email and office files

Gmail

Your Gmail, per employee.

Microsoft 365

Outlook mail (inbox and sent) and SharePoint/OneDrive documents.

Google Drive

Your Google Drive documents, personal folder and shared drives.

Dropbox

Your Dropbox files.

Box

Your Box files.

Mail inbox (.mbox)

A one-time import of a mail export in the .mbox format.

Team chat

Slack

Public channels and the private channels you authorise, never direct messages.

Microsoft Teams

Team channels, never private conversations.

Calendar and scheduling

Google Calendar

Your events, personal appointments excluded automatically.

Outlook Calendar

Your events, personal appointments excluded automatically.

Calendly

Bookings made through Calendly, never the invitees' contact details.

Cal.com

Bookings made through Cal.com, never the invitees' contact details.

Recorded meetings

Fireflies

The summary and action items from your meetings, never the verbatim transcript or the recording.

Grain

Summary and key points from your meetings, never the recording.

Gong

Summary and key points from your sales calls, never the recording, contact details, or deal amounts.

CRM and sales

HubSpot

Contacts, companies, deals, tickets and logged interactions.

Salesforce

Accounts, opportunities, contacts, cases and leads.

Pipedrive

Deals, contacts, organisations and activities.

Zoho CRM

Your Zoho CRM.

Folk

Your contacts and relationships, never emails or phone numbers.

Customer support

Zendesk

Your tickets: subject, description and comments.

Intercom

Support conversations: subject and exchanges.

Front

Conversations from your shared inboxes, never attachments.

Crisp

Your live-chat conversations.

Documentation and knowledge

Notion

The shared pages of your workspace.

Confluence

The pages and blog posts of your wiki.

Guru

Your knowledge cards.

ClickUp Docs

Your ClickUp documents.

Project management

Jira

Your tickets: summary, description and comments.

Asana

The tasks in your projects.

ClickUp

The tasks in your lists.

Monday

The items on your boards.

Trello

The cards on your boards.

Development

GitHub

Issues and pull requests from your repos, never the code or the wiki.

GitLab

Issues and merge requests from your projects, never the code or the wiki.

HR

Lucca

The directory: name, title, department and manager, never payroll or personal contact details.

Payfit

The directory: name, title, department and manager, never payroll or personal contact details.

Factorial

The directory: name, title, department and manager, never payroll or personal contact details.

Deel

The directory: name, title, department and manager, never payroll or personal contact details.

Finance and accounting

Pennylane

Your invoices: number, date, counterparty, amount and status, never bank details.

Sage

Your invoices: number, date, counterparty, amount and status, never bank details.

QuickBooks

Your invoices: number, date, counterparty, amount and status, never bank details.

Xero

Your invoices: number, date, counterparty, amount and status, never bank details.

Spendesk

Your suppliers and expense reports: amounts and statuses, never bank details or card numbers.

E-signature

Yousign

The status of your signature requests, never the signed document or the signers' contact details.

PandaDoc

The status of your documents, never the content or the recipients' contact details.

Dropbox Sign

The status of your signature requests, never the signed document.

DocuSign

The status of your envelopes, never the signed document.

Marketing and email

Mailchimp

Your campaigns and their statistics, never your contacts one by one.

Brevo

Your campaigns, their statistics and your sales deals, never your contacts one by one.

Mailjet

Your campaigns and their statistics, never your contacts one by one.

Databases and spreadsheets

Airtable

The records in your bases, never the attachments.

Once connected

You decide who sees what.

MCP is a standardised power socket for AI: a universal port an AI tool plugs into to reach a company's context and tools. Kastel is an MCP server: it publishes your context on that socket. Any compatible AI connects to it, reads what it has the right to see, and acts. Switching AI is like unplugging one appliance and plugging in another on the same standard wall socket: nothing to move.

Yours isn't listed?

A shared folder or an Obsidian vault plug in directly, with no setup. And any source already compatible with the MCP protocol connects the same way, with no dedicated connector to write.

Request a connector

Every connector runs inside your instance, isolated. Never an engine shared across companies.

Let's build your fortress.

The complete core, with all its connectors, is free when self-hosted. If you'd rather we hosted it, or helped you connect it, tell us.

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