Cold outreach that
runs itself.

The cold email platform that researches every prospect, writes emails worth replying to, and protects your sending reputation. Point it at your website and it builds your ICP, finds verified leads, and ships campaigns the same day.

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The problem

Most cold email today is templated, blasted, and ignored. The replies you do get are usually "please remove me".

1-5%
The reply rate most cold email earns. Sending more to make up for it is exactly what gets you flagged.
5%
Bounce past this and Gmail, Yahoo, and Outlook start throttling everything you send (2024 sender rules).
~30%
How much B2B contact data goes stale every year. Spray-and-pray burns the list and the domain with it.
How it works

From a URL to inbox-ready outbound, in eight moves.

You hand Defrost your website. Defrost hands you back conversations. Everything in between (research, copy, deliverability, learning) happens on its own, with you in the loop whenever you want.

01
Website scan
Point at your URL. We read every page.
02
ICP built
A buyer profile drawn from what you actually sell.
03
Leads found
We source matching contacts at the right companies.
04
Leads verified
Bounces filtered out before they cost you anything.
05
Emails written
Personalized to the human, not the company logo.
06
Sending live
Warmed inboxes, sane volume, real deliverability.
07
Experiments running
Deterministic A/B testing and gating across every framework.
08
Insights surface
Plain-English signals from replies, opens, and unsubscribes.
FEATURE 01 / RESEARCH

Deep research on every prospect, before a single word is written.

We scrape company websites, detect buying signals, and build a dossier on each lead. Every email references something real: a recent launch, a hiring spree, a podcast quote, the actual stack they use.

  • Pulls from your prospects' blogs, careers pages, and press releases
  • Surfaces buying signals: fundraising, hiring, tech changes
  • Stores a transparent dossier you can edit before send
Source · acme.co/blog
"We're rebuilding the deploy pipeline around Bazel. Three engineers shipped what used to take eight."
signal · engineering velocity
↓
Signal · linkedin/in/liam
Liam Park · VP Eng: posted about hiring 4 platform engineers, last Tuesday.
signal · hiring · platform
↓
Dossier ready
3 hooks · 7 sources · 2 buying signals · ready to compose
FEATURE 02 / COMPOSE

Emails that read like a human wrote them. Because, in a way, one did.

Seven proven frameworks: PAS, Before/After/Bridge, problem-pull, and four more. Anti-AI humanization rewrites cadence and word choice so it doesn't trigger a single GPT-detector. Every send is spam-scored before it leaves your outbox.

  • Seven cold-email frameworks, applied per prospect
  • Humanization pass strips common AI tells while keeping your voice
  • Pre-send spam scoring on subject and body
TO · liam@acme.coDRAFT
PASBABQVCAIDAPULL+2

Subject: your bazel rebuild

Liam, saw your post about three engineers shipping what eight used to. Quick one: how are you handling the CI cache layer now that builds are split that way?

We just helped Linear cut similar build times by 40%. Worth a 15-minute swap of notes?

— Maya

Spam score · 0.4 / 10AI-detector · 2% (human)
FEATURE 03 / INSIGHTS

Gets smarter every campaign. The longer you use it, the better it gets.

Defrost observes what gets opened, what gets replies, what gets unsubscribes, and surfaces the patterns weekly in your Insights page — sample sizes, signal strength, and a recommendation. Every campaign sharpens the picture; you decide what to apply to the next one.

  • Per-recipient research dossier built from real, sourced facts
  • Insights surface what's working with sample sizes and signal strength
  • Plain-English summaries: you apply changes manually, on your terms
Reply rate · last 90 days8.4%+ 5.9 pts
Week 1Wk 4Wk 8Wk 12
+ shorter subjects win for VPs+ Tuesday 9:40am– "quick question" retired– long P.S. blocks
Defrost vs. the rest

Most outbound stacks make you pick two. We don't.

The usual stack

  • Five tools to stitch: scraper, enricher, AI, sender, inbox-warmup
  • Generic AI copy that every detector flags as a robot
  • Single shared mailbox at risk of getting blacklisted
  • You tune campaigns by hand, week after week
  • "Personalization" that swaps {firstName} and calls it a day

Defrost

  • One product, one URL in. Campaigns go out the same afternoon
  • Seven frameworks plus humanization that reads like a person wrote it
  • Dedicated, auto-warmed inboxes per sending domain
  • Insights observe what's working: you apply changes manually
  • Real research dossiers: every email references something true
FAQ

Reasonable doubts, reasonable answers.

Is this just another AI cold-email tool?
No. Most AI tools generate text and stop. Defrost runs the whole pipeline: research, ICP, lead sourcing, verification, copy, A/B testing, sending, deliverability, and learning. The output reads like a human wrote it because every email is grounded in real, sourced facts about the recipient.
Will my emails land in spam?
We auto-warm every sending mailbox you connect, score every send for spam triggers, and cap volume at deliverability-safe rates. Bounce rates above 5% pause the campaign automatically so a bad batch can't torch your reputation.
What about CAN-SPAM, GDPR, and CASL?
Defrost adds a compliant footer to every email, honours unsubscribe within minutes, and scrubs against suppression lists you upload. A GDPR DPA is available today, and we keep a full audit log of every contact and message.
How long until I see replies?
Most teams have campaigns out the door within a day of mailbox warmup. Insights start surfacing what's working from week one. You decide when to apply changes. Reply timing depends on ICP fit, copy, and your prospect's inbox habits; we don't promise specific multipliers.
Do I need to bring my own leads?
No. Point Defrost at your website and we'll build the ICP and source matching leads. You can also import lists if you have them. We'll verify, enrich, and dossier-build on top.
Can I see the email before it sends?
Yes. Every email can be reviewed, edited, or auto-approved on a per-segment basis. Most users start in review mode and graduate to auto-send once they trust the voice.

Outreach that
earns the reply.

Founding-100 customers get 30% off their first 3 months, a permanent badge, and a direct line to the founders inside the app.