The AI first outbound platform
Cold email sequences and calendar invite campaigns, both sending from your own Google Workspace mailboxes, both written by an AI provider you choose and pay directly, and both piping every event onward through webhooks and n8n.
01 · Cold email
Sequences that stop when they should
Build a multi step sequence with per step delays from same day out to a year. Choose template copy or let AI write each message from the recipient website. Anyone who replies drops out automatically.
A/B variants per step
Run two versions of any step. A daily job picks the winner on reply rate so the better copy takes over without you watching it.
Validation before enrollment
Syntax, MX, and role address checks run before a contact enters a sequence. Anything questionable is quarantined instead of sent.
Suppression that sticks
One click unsubscribe headers on every message, plus a suppression list checked before every single send.
02 · Replies
An inbox that triages itself
Replies land in a shared threaded inbox with intent already labelled across nine categories and seven languages. Bounces are parsed and suppressed. You read the ones that matter.
This is timely, we are reviewing vendors this quarter. Can you send pricing?
Interesting, but this is out of budget for us right now.
Not me, but you should talk to our ops lead. Copying her here.
Revisit this in Q3 please, we are mid migration until then.
I am out of the office until the 14th with limited email access.
No open tracking. On purpose.
Open pixels drag down deliverability and inflate a number almost nobody acts on. Tantra measures clicks through a signed link on your own tracking domain, plus replies, reply intent, bounces, and unsubscribes. Those are the signals worth routing to a person.
03 · Calendar outreach
Invitations, not another email
Tantra creates a Google Calendar event and adds recipients as attendees, so Google delivers the invitation and it lands on their agenda. RSVP is the engagement signal, reconciled every 10 minutes and pushed to your CRM.
| Campaign | Tag | Status | Invited | Yes | Maybe | No | Pending | Event date |
|---|---|---|---|---|---|---|---|---|
| Product webinar, March cohort | webinar | Active | 18,420 | 4,318 | 1,102 | 1,204 | 11,796 | Mar 14, 2026 |
| Enterprise demo series, set A | demo | Active | 9,640 | 2,284 | 610 | 742 | 6,004 | Mar 18, 2026 |
| Partner enablement workshop | partner | Draft | 0 | 0 | 0 | 0 | 0 | Apr 2, 2026 |
Distributed across senders
Campaigns up to 50,000 contacts are split across your sender pool automatically, in batches, with retry on failure.
RSVP straight to your CRM
Accepts, declines, and tentatives are reconciled every 10 minutes and delivered by webhook to any endpoint you configure.
WebinarGeek sync
Sync broadcasts and subscribers, invite registrants automatically, and report on attendance in the same place.
04 · AI layer
Your key, your model, your prompt
Connect OpenRouter, Cerebras, or Novita and Tantra uses your key for every generation. There are no AI credits to buy from us and no markup on inference. Every call is logged so you can audit both cost and prompt.
Write like a founder emailing a peer. Two sentences of context from their site, one specific question. No superlatives.
Hi Dana, I saw Northwind opened the Rotterdam depot in January and is hiring dispatch coordinators for it. Usually that means route planning is about to get painful. How are you handling driver comms across the two sites right now?
Run Tantra from Claude or Cursor
Tantra ships an MCP server, so any MCP capable AI client can drive it as a native tool. Ask Claude to list your campaigns, import a contact list, pull dashboard metrics, or launch a campaign, in plain language.
05 · Deliverability
Domain health, checked daily
Every sending domain is scanned each day for SPF, DKIM, DMARC, and DNSBL listings and scored, so a problem surfaces here before it surfaces in your reply rate.
Sender performance
Per mailbox, with warmup state
| Mailbox | Sent | Replies | Reply rate | Bounce | Warmup |
|---|---|---|---|---|---|
| sender-01@yourdomain.example.com | 1,450 | 94 | 6.5% | 0.7% | Warmed |
| sender-02@yourdomain.example.com | 1,380 | 82 | 5.9% | 0.9% | Warmed |
| sender-03@outreach.example.com | 1,290 | 71 | 5.5% | 1.1% | Warmed |
| sender-04@outreach.example.com | 620 | 38 | 6.1% | 0.6% | Warming |
06 · Compliance
Unsubscribe and suppression
One click unsubscribe headers on every message, and a suppression list checked before every send. Block individual addresses, whole domains, top level domains, or role mailboxes, and bulk import existing lists by CSV.
| Value | Reason | Added |
|---|---|---|
| optout@example.com | One click unsubscribe | Mar 4, 2026 |
| info@example.org | Role mailbox | Mar 3, 2026 |
| example.net | Domain block | Mar 1, 2026 |
| bounced@example.com | Hard bounce | Feb 27, 2026 |
07 · Integrations
Webhooks, n8n, and anything downstream
Tantra emits a typed event the moment something happens and POSTs it to any endpoint you configure. Wire that into n8n, Zapier, or Make and drive whatever comes next: the CRM record, a LinkedIn touch in your own tooling, a Slack alert, an enrichment step. Those actions run in your automation tool, not inside Tantra, so you are never limited to the integrations we happened to build.
Typed events, delivered reliably
email.sent, email.replied, email.clicked, email.bounced, email.unsubscribed, email.intent.classified, email.sequence.completed, and lead.stage.changed, plus RSVP updates from calendar campaigns. Retried and deduplicated so a flaky endpoint costs you nothing.
REST API with scoped keys
Issue API keys scoped to exactly what an integration needs, across campaigns, contacts, and webhooks. Revoke any key without touching the others.
n8n, Zapier, and Make
Point a webhook at your automation tool and take any action from there: create the CRM record, queue a LinkedIn touch, alert Slack, enrich the contact, append a row, or call your own service.
Google Workspace and WebinarGeek
Service account connection for sending, plus broadcast and subscriber sync for webinar programs. Microsoft Calendar is coming soon.
{
"event": "reply.received",
"campaign": "Q1 outbound",
"contact": "dana@example.com",
"intent": "interested",
"leadStage": "engaged",
"score": 42
}Both engines. Every mailbox you own. One price.
Start on the free plan and connect your first mailbox today.