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.
Everything you need to send cold email that lands
Build the sequence, let Bird write it for you, and catch every reply — all in one place, with no DNS work and no per-inbox tax.
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.
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.
The unglamorous parts, handled for you
Safe sending, real deliverability, clean lists and honest analytics — plus an API-first core your agents can drive.
Plug it into anything — or let your agent run it
API-first by design: a REST API, typed webhooks, public OpenAPI docs and a 40-tool MCP server.
- REST API v1 + OpenAPI docs
- Typed webhooks
- MCP server — 40 tools
- No lock-in, export anytime
curl -X POST /v1/sequences \
-H "Authorization: Bearer $KEY" \
-d '{ "name": "Q3 outbound",
"steps": [
{ "subject": "quick question", "waitDays": 0 },
{ "subject": "re: quick question", "waitDays": 3 }
] }'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
- Smart contact distribution
- Never double-sends
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
- Protects the mailboxes you bring
- Always-on health checks
Clean lists, protected reputation
Validate contacts on import, dedupe globally and suppress permanently — so you only ever email real, reachable people.
- Pre-import validation
- Global dedupe
- Permanent suppression
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
- Per-sequence & per-mailbox reports
- Custom tracking domains
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