Every capability for omnichannel outbound, in one platform.
Run omnichannel sequences across Gmail, LinkedIn and WhatsApp, or Calendar campaigns measured by RSVP. Send from your own accounts, personalize with AI where it improves the message, and report on the signals that reflect real engagement.
Explore each capability
01 · Omnichannel sequences
Coordinated outreach across three channels
Build one sequence of ordered steps across Gmail, LinkedIn and WhatsApp, with a delay before each step and a stored template behind every message. A sequence can run on social channels alone. When a reply is detected, the sequence stops for that contact. AI can personalize email content from the prospect's website, with the stored template as the fallback; social steps use templates, variables and spintax.
Sample data
Email · Send emailSends immediatelyHi {{firstName}}, saw {{company}} is scaling field operations this year. Teams like yours cut onboarding time 40% by moving hands-on training into VR. Worth a 20-min look? Thanks, {{senderFirstName}}
LinkedIn · Visit profileWaits 1 dayProfile visit: no message content.
LinkedIn · Connection requestWaits 1 dayHi {{firstName}}, sent you a note about VR training at {{company}}. Would love to connect.
Email · Send emailWaits 3 daysQuick bump, {{firstName}}: happy to share the 3-min demo loop our aerospace customers use for onboarding. Useful?
Email · Send emailWaits 4 daysClosing the loop, {{firstName}}. If training capacity comes up for {{company}} next quarter, this is the fastest path to a pilot. Door stays open.
Three channels, one sequence
Each channel sends from its own connected account. If a contact has no identity for a channel, that step is skipped rather than failing the sequence, and a LinkedIn message can wait until the connection request is accepted.
Gmail
- Send an email step from a verified Workspace mailbox
- Keep follow-ups on the same thread
- Optional AI personalization on subject and body
- Visit a profile
- Send a connection request with an optional note
- Send a message
- Send a plain-text message to a contact phone number
Pro includes up to 2 LinkedIn or WhatsApp accounts and Scale up to 12 LinkedIn or WhatsApp accounts, and you can add more at $10 per additional account per month. Google Workspace is needed only for Calendar campaigns and Gmail steps.
Template fallback
If website research or AI personalization cannot complete, Tantra sends the approved stored template instead.
Validation before enrollment
Syntax, MX and role-address checks run before a contact enters a sequence. Questionable addresses are quarantined rather than sent.
Suppression on every send
One-click unsubscribe headers on every message, and a suppression list checked before each send.
02 · Prospect Intake · New
Prospects in, campaigns running
Add prospects to an omnichannel campaign by webhook, REST API or your AI assistant, without a CSV upload or a manual start. Each prospect enters step one automatically and runs through the same email, LinkedIn and WhatsApp steps as an uploaded contact.
Illustrative
Form fills, CRM, Clay, Zapier, n8n, Make
From your own code, with an API key
“
Step 1 · EmailEmailStep 2 · LinkedInLinkedIn
Step 3 · WhatsAppWhatsAppWebhooks
Send prospects from your forms, CRM, Clay, Zapier, n8n or Make straight into a campaign.
REST API
Add prospects to a campaign from your own code with an API key.
AI assistants
Claude, Claude Code, ChatGPT and other MCP-compatible assistants find, qualify and add prospects for you.
Safeguards apply to every prospect
Every prospect passes the same suppression, validation, sending-limit and sending-window checks, however it arrives.
03 · Replies
Every reply, with its campaign attached
Gmail threads and mirrored LinkedIn and WhatsApp conversations return to one inbox. A reply updates the contact's enrollment, and bounces and unsubscribes feed the safeguards that prevent further follow-up.
Sample data
Hi Olivia, saw Helios is scaling production this year. Teams like yours cut onboarding time 40% by moving hands-on training into VR. Worth a 20-min look? Thanks, Katarina
Katarina, yes, let us talk. Our plant director has been pushing for exactly this since the Hanover fair. Send a calendar invite for next week? Copying our L&D lead. Olivia
No open tracking
Tantra does not add open-tracking pixels. Replies, signed-link clicks, bounces and unsubscribes are the email signals it reports. With click tracking on, each new send uses your current verified tracking domain.
04 · Calendar outreach
Calendar invitations as a campaign type
Tantra creates a Google Calendar event and adds recipients as attendees, so Google delivers the invitation and it appears on their calendar. Yes, No and Maybe responses are the engagement signal. Link Zoom or WebinarGeek to attribute registrations and attendance, and refresh that data on request.
Sample data
Distributed across senders
Large lists are spread across your verified Calendar senders in scheduled batches, and recoverable failures are retried automatically.
RSVP webhooks
Send Yes, No and Maybe responses to any HTTPS endpoint. Delivery is at least once, and every event carries an ID for deduplication.
Webinar registration
An opted-in Calendar campaign can register Yes and Maybe responses for a linked Zoom or WebinarGeek webinar. Registrant and attendance data refresh on request.
05 · AI layer
AI personalization on your own account
Sign in with a ChatGPT or Claude account, with no API key, or connect OpenRouter, Cerebras or Novita with your own key. Choose the model, test the output and set a default provider. AI personalizes email subject and body and Calendar descriptions; social steps use templates, variables and spintax.
Sample data · illustrative AI draft
Operate Tantra from Claude or Cursor
Tantra's MCP server gives Claude, Cursor and other MCP clients dozens of tools for campaigns, contacts, inbox and analytics, over local stdio or hosted Streamable HTTP. It covers core workflows rather than every action in the app.
06 · Deliverability
Deliverability controls on every send
Before an email leaves, Tantra checks sender readiness, recipient validity, suppression and the sending schedule, and it stays within each account's daily and hourly limits.
Sender performance
Per mailbox, with warmup state
Sample data
07 · Compliance
Unsubscribe and suppression
One-click unsubscribe headers on every message, and a suppression list checked before every send. Block addresses, whole domains, top-level domains or role mailboxes, and import existing suppression lists by CSV.
Sample data
08 · Integrations
Campaign events in the rest of your stack
Send campaign events to any HTTPS endpoint, automate Tantra through the REST API, or operate it from an AI client over MCP. n8n, Zapier and Make connect through webhooks.
Webhook events for every channel
Calendar RSVPs, email replies, clicks, bounces and unsubscribes, LinkedIn acceptances and replies, and WhatsApp replies. Delivery is at least once, with an event ID for deduplication.
REST API with account-level keys
Revocable keys with optional expiry. The full key is shown once, and each key carries account-level access.
n8n, Zapier, and Make
Route any webhook event through your automation tool to update a CRM record, alert Slack, enrich a contact, append a row or call your own service. These connect through webhooks rather than native apps.
Google Workspace, Zoom, and WebinarGeek
Verify Workspace senders for Gmail and Calendar. Zoom and WebinarGeek data refresh on request; an opted-in Calendar campaign can register positive RSVPs, and sequences provide attribution.
Sample data
{
"event": "calendar.rsvp.yes",
"eventId": "evt_3e8f4a",
"contact": "[email protected]"
}Start with the channels you already use.
Start a Pro trial and connect your first account today. Unlimited email and calendar accounts, with LinkedIn and WhatsApp accounts included.