Cold email that lands - and replies you'll actually see.
Bird, your AI assistant, researches a site and writes the whole sequence — then sends safely and catches every reply in one inbox. Bring mailboxes you own or buy them from any provider inside coldBirds — we handle SPF, DKIM and DMARC so you never touch DNS.
15-day free trial · No credit card · Connect or buy Google, Microsoft 365, Zoho, Proton & SMTP
Connect what you own — or buy fresh
Google, Microsoft 365, Zoho, Proton, iCloud, Yahoo, Azure or any SMTP. One sequencer, every provider — no lock-in to a single rented pool.
Google
Microsoft 365
Zoho
Proton
iCloud
Yahoo
AzureZero DNS setup — we configure SPF, DKIM & DMARC for you.
Build & launch campaigns in minutes
Multi-step sequences with per-step copy, A/B variants and smart delays — set it up once and let it run.
A/B test every step
Run subject and body variants and let the winners speak for themselves.
Business-day-aware delays
A '3-day wait' means 3 working days — your steps never land on a Saturday.
Timezone-correct sending
Each prospect gets your email at the right local hour, automatically.
AI that does the work
Bird researches a website, drafts the whole sequence, rewrites your copy and helps triage replies — then hands you the keyboard.
Bird, your in-app assistant
Chat to build campaigns, edit copy and run the product hands-free.
AI sequence generation
Point Bird at a website and get a full, on-brand sequence to refine.
Agent-ready by design
A 40-tool MCP server and REST API let your own AI agents drive coldBirds.
Send at scale without the fear
Sleep at night knowing your mailboxes won't burn. coldBirds paces every send, respects your limits and never double-sends.
Per-mailbox caps & windows
Daily and hourly limits, sending windows and weekend skipping, enforced for you.
Smart contact distribution
Volume is balanced across mailboxes so no single inbox gets pushed too hard.
Never double-sends
Resilient send jobs resume exactly where they left off — a hiccup never emails a prospect twice.
Land in the inbox, not in spam
Adaptive warmup, smart throttling and real placement analytics protect the reputation of whatever mailboxes you bring or buy.
Real placement analytics
See genuine inbox-vs-spam placement per mailbox — not just 'delivered'.
Protects the mailboxes you bring
Per-mailbox reputation tracking and velocity throttling keep the boxes you own — or buy — out of spam.
Always-on health checks
Mailbox SMTP, IMAP and DNS health is monitored and auto-flagged before it bites.
One inbox for every reply
Real-time reply detection brings every response into one Gmail-style inbox and pauses the sequence the moment a prospect writes back.
15-minute reply detection
We scan your mailboxes every 15 minutes so hot replies surface fast.
Thread-based matching
Replies are matched by thread, catching responses from forwarded or alternate addresses.
Auto-pause on reply
The sequence stops the instant someone replies — no awkward follow-ups.
Clean lists, protected reputation
Validate contacts on import, dedupe globally and suppress permanently — so you only ever email real, reachable people.
Pre-import validation
Invalid, duplicate, role-based and catch-all addresses are filtered before they ever send.
Global dedupe
Contacts are de-duplicated across every sequence and teammate.
Permanent suppression
Unsubscribes and bounces are suppressed forever, across all campaigns.
Know what's actually working
MPP-aware analytics separate real human engagement from Apple-proxied opens, with reports per sequence and per mailbox.
MPP-aware opens
Apple-proxied opens are flagged, so your open rate reflects real humans.
Per-sequence & per-mailbox reports
Drill into deliverability and engagement wherever it matters.
Custom tracking domains
Clean, branded tracking links keep your sends looking legitimate.
Plug it into anything — or let your agent run it
A REST API, typed webhooks, public OpenAPI docs and a 40-tool MCP server. coldBirds is API-first, so it fits your stack and your AI agents.
REST API v1
Public OpenAPI docs at /api/docs — create sequences, contacts and mailboxes programmatically.
Typed webhooks
Subscribe to events like reply.received and mailbox.health.degraded.
MCP server
@coldbirds/mcp-server ships 40 tools so your AI agent can run outreach end-to-end.
No lock-in
Export your data anytime — your mailboxes, domains and contacts stay yours.
curl -X POST https://sequencer.coldbirds.com/v1/sequences \
-H "Authorization: Bearer $COLDBIRDS_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"name": "Q3 outbound",
"steps": [
{ "subject": "quick question, {{first_name}}", "waitDays": 0 },
{ "subject": "re: quick question", "waitDays": 3 }
]
}'How it works
From zero to your first campaign today — connect, import, build (or let Bird), then send and catch replies.
Connect or buy mailboxes
Connect mailboxes you own or buy them from any provider — Google, M365, Zoho, Proton, SMTP. We configure SPF, DKIM & DMARC for you, no DNS work.
Import your contacts
Upload a CSV or push via API. We validate, dedupe and suppress bad addresses on the way in.
Build it — or let Bird
Compose a multi-step sequence yourself, or let Bird research a website and draft the whole thing.
Send safely & catch replies
coldBirds paces every send and surfaces every reply in one inbox. You focus on closing.
Why coldBirds sequence
Same job as a typical sequencer — built on deliverability-grade infrastructure, not shared pools.
Built by people who live and breathe deliverability
We've spent years keeping cold email out of spam. The sequencer is that expertise in your hands — with the mailboxes you bring or buy, monitored 24/7.
Deliverability is our day job
We monitor inbox placement and pace every send. Bring your boxes or buy them from any provider — we keep them healthy.
Inspect everything
A public REST API, live OpenAPI docs and an MCP manifest mean no black boxes and no lock-in — see exactly what runs.
Your data, isolated
Per-user isolation, idempotent sending and audited admin actions — the boring guarantees that keep your data safe.
Risk-free to try
15-day free trial, no credit card, cancel anytime. Your mailboxes, domains and data always stay yours.
Founding price-lock: start now and keep $20/month for life.
One plan. Everything included.
One plan. Every feature. No per-inbox tax.
- Unlimited multi-step sequences with A/B variants
- Business-day-aware delays & timezone-correct sending
- Bird AI assistant + AI sequence generation & rewriting
- Safe-sending engine — per-mailbox caps & smart throttling
- Warmup with real inbox-vs-spam placement analytics
- Unibox — real-time reply detection & auto-pause
- Contact import validation, global dedupe & suppression
- MPP-aware opens, per-mailbox reports & custom tracking domains
- REST API, webhooks, public OpenAPI & MCP server
- Connect or buy Google, Microsoft 365, Zoho, Proton, iCloud or SMTP
- Buy or connect mailboxes from any provider + deliverability monitoring
Why $20? One simple plan — no per-inbox fees, no feature gates. We'd rather you scale than nickel-and-dime your mailboxes.
Founding price-lock: start now and keep $20/month for life.
Fair use: generous per-mailbox sending caps tuned for deliverability — cancel anytime, your data stays yours.
Frequently asked questions
Bring mailboxes you already own — Google, Microsoft 365, Zoho, Proton, SMTP — or buy fresh ones from any provider right inside coldBirds. No lock-in to a single rented pool. Your call.
Start sending cold email that actually lands
Spin up your first sequence today. Connect mailboxes you own or buy them from any provider — we handle deliverability.
15-day free trial · No credit card · Your mailboxes and data stay yours