ColdStack is an AI agent that runs your entire outbound pipeline — finds leads, writes cold emails, sends, follows up, and reports results. Around the clock. No headcount.
Tell ColdStack who you're targeting — industry, company size, title, funding stage. It builds a target list and keeps it fresh.
Before each email, ColdStack reads your prospect's LinkedIn, recent news, job postings, and any public signal. Then it writes to that.
Personalized emails go out daily from your own domain. ColdStack follows your cadence — 3 days, 7 days, resend with new angle.
Daily digest: opens, replies, meetings booked, pipeline generated. You review the replies; ColdStack handles everything else.
Distribute sends across your mailboxes with automated warmup. Health scores, cooldown triggers, and rotation — all handled.
Reads every prospect's LinkedIn, news, and signals. Writes fresh copy for each lead — not mail-merge tokens, actual writing.
Hiring signals, funding news, tech-stack changes — ColdStack finds trigger events and adds high-intent prospects to your pipeline.
13-type classifier: positive, question, OOO, not interested, referral — auto-drafts responses and routes the hot leads to you first.
Detects meeting interest, generates time proposals with Cal.com links, auto-advances leads to "meeting booked" status.
Test subject lines, body angles, and send times. Statistical winner declarations with 95% confidence. Auto-retire losers.
We're building in public. No paid tiers until the product is rock-solid. You get the full platform, we get honest feedback.
No credit card. No catch. Cancel anytime.
"Set it up in 20 minutes. First reply came in 2 hours."
— Alex M., Founder @ Kaption"I was skeptical. Then I got 6 qualified replies in week one."
— Sarah K., Head of Growth @ Relay"No SDR. No agency. Just ColdStack running outbound while I slept."
— Tom W., Solo FounderOther tools give you templates. ColdStack gives you a writing system — it reads every prospect's public footprint and writes every email fresh. Not a mail merge. Not a template. A real message that happens to be written by AI.
ColdStack connects to your email account — it sends from your inbox, using your domain, with your warmup and reputation profile. Deliverability stays clean because it's real email, not a separate sending domain.
Most sequences are a 3-email chain that everyone ignores. ColdStack builds multi-step cadences with genuine variation — different angles, different subject lines, different times of day. If no reply after 5 touches, it flags the lead as cold and moves on.
Every sales team has someone who "could do outreach if they had time." Nobody has time. So outreach doesn't happen, or it happens badly — mass-sent templates that everyone ignores, research that never gets done, follow-ups that slip through the cracks.
ColdStack was built for the founder who's thought about outbound a hundred times, done it for two weeks, and given up. It runs the whole thing. You review the replies.