01
Message CRUD, threads, drafts, sending, tracking, search, labels, attachments, and repairable incremental sync.
5 MVP surfaces
Neutral communications layer
Brand system / v0.1
Neutral communications & scheduling control plane
Unified event stream
horato connection.created provider=google status=active
horato email.message.created sync=delta cursor=verified
horato calendar.event.updated etag=preserved
horato mcp.email.send approval=required
Provider index
Google WorkspaceMicrosoft 365GmailOutlookIMAPSMTPCalDAVCardDAVCal.comCronofyNylasAurinko
Every resource your customers already live inside.
Horato turns provider variance into explicit capabilities, sync state, and durable events across the communication surfaces your product needs.
02
Calendar
Events, availability, free/busy, recurrence, RSVP, conferences, watch renewal, and sync token recovery.
Push plus delta
03
Contacts
Contact CRUD, multi-value fields, dedupe assistance, address books, groups, and directory-aware capability flags.
Raw payloads preserved
04
Tasks
Task lists, completion, reconciliation, subtasks, linked resources, and provider-specific status mapping.
Google plus Graph
05
Scheduling
White-label booking links, event types, slot generation, lifecycle tokens, buffers, questions, and reminders.
Booking as system of record
06
MCP
Agent tools for search, availability, booking, and email send with explicit approvals for external actions.
Approval-safe writes
Architecture
Normalize the common path. Preserve every provider truth.
Horato is a layered control plane over provider adapters, not a lowest-common-denominator wrapper. Clients get canonical models, capability flags, raw payload escape hatches, signed webhooks, and one action model across REST, SDKs, and MCP.
01
Provider adapters
Google Workspace and Microsoft 365 lead the MVP, with IMAP, SMTP, CalDAV, and CardDAV adapter families next.
02
Canonical domain layer
Email, calendar, contacts, tasks, scheduling, and webhooks share tenant-aware models without discarding etags, sync tokens, or provider IDs.
03
Event log and delivery
Inbound push and delta changes land in an internal log before replay-safe customer webhooks are signed and delivered.
04
Agent-safe action plane
The same actions power REST, JS, Python, and MCP tools, with approval gates for email send, bookings, event mutation, and destructive operations.
Designed for products where communication is workflow state.
Each surface can ship alone, but the control plane gets stronger when conversations, schedules, tasks, and approvals share one event stream.
One action model, three developer surfaces
Backend teams can start with API keys and OAuth helpers, then use the same resource model through JavaScript, Python, webhooks, and MCP.
Developer surface
JavaScriptconst horato = new Horato({ apiKey });const draft = await horato.email.drafts.create({ connectionId, to, subject, bodyHtml});await horato.email.drafts.send(draft.id);Built for teams that cannot lose provider state
Least-privilege OAuth, PKCE where required, tenant-aware token vaulting, and redacted logs.
Signed outbound webhooks with replay defense, delivery inspection, retries, and dead-letter handling.
Immutable audit history for connections, approvals, provider changes, and externally visible actions.
Designed for SOC 2, GDPR, retention controls, export flows, and regulated deployment modes.
One plan. Account-based volume pricing.
Every email, calendar, contact, task, scheduling, webhook, SDK, and MCP capability is included. Pay $1/month per integrated account, with a lower account rate above 1,000 accounts.
Single plan
$1per integrated account per month
above 1,000 accounts
$0.75per integrated account per month
Same plan, lower rate at scale.
Unified email, calendar, contacts, tasks, and scheduling APIs
Google Workspace and Microsoft 365 in the MVP provider set
Signed webhooks, retries, dead-letter handling, and delivery inspection
JavaScript SDK, Python SDK, and MCP helper surfaces
Approval gates for email send, bookings, event mutation, and destructive actions
Capability flags, raw payload passthrough, etags, sync cursors, and audit history
No separate module fees.
$0.75/account above 1,000 accounts.
No webhook surcharge.
No MCP surcharge.
Horato gives product teams a single communication layer without hiding the details that make provider integrations difficult.
Platform engineering lead
B2B workflow company
Book demo
Build on the neutral layer before providers shape your product.
Tell us what you are integrating first. We will map your provider mix, sync risks, booking needs, and agent approval model.