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cldengine
Start free

Send from the inboxes you already own.

Unlimited mailboxes, unlimited emails, warmup running the whole time. Every reply comes back to one inbox, sorted by AI, with an answer already drafted.

Start free →See how it works
14 days money back · warmup included on every plan · hosted in the EU
Gmail
OAuth, two clicks
Outlook
OAuth, two clicks
Google Workspace
OAuth or app password
Microsoft 365
OAuth or app password
Any IMAP and SMTP
host, port, password

YOUR DOMAIN, YOUR MAILBOXES, YOUR SENDING REPUTATION · NOTHING IS RENTED FROM US

01

Connect the inboxes you own

Gmail and Outlook in two clicks, anything else over IMAP and SMTP. Unlimited mailboxes, on every plan.

02

Write the sequence, set the window

Steps with A/B/Z variants, spintax and conditions, and a spam risk score per step before you send a thing.

03

Work the replies, not the sending

Every reply lands in one inbox, sorted by AI into Interested, Meeting booked or Not now, with a draft answer ready.

A REPLY COMES IN
MK
Marta Kowalska
Nordwerk · replied at 09:14
InterestedACT NOW
Interesting timing. We are actually reviewing tools this quarter. What does onboarding look like?
reply agent is reading it
SUGGESTED REPLY · WAITING FOR YOUR OKHappy to walk you through it. Would Thursday 11:00 or Friday 15:00 suit you better?
Send itEdit
Example campaign
Agency owners · 3 steps · 4 mailboxes
Sent
1,240
Replied
11.4%
Meetings
37
Deliverability

Warmup is not an upsell here.

Every mailbox you connect starts warming the same day, on every plan, at no extra cost. Real conversations with real inboxes, and a placement score you can actually check before you launch a campaign.

included on Starter, Growth and Scale
runs while your campaigns run
pause a mailbox and warmup keeps going
INBOX PLACEMENT · NEW MAILBOXhealthy since day 18
Pricing

Pay for the engine, not per seat.

Unlimited mailboxes and unlimited emails on every plan. Credits are only for the extras that cost us money: finding leads and the AI agents. Top up when you need to.

Starter
$19a month, billed yearly
$22 monthly1,000 credits1 seat
Growth
$35a month, billed yearly
$42 monthly2,500 credits5 seats, API and webhooks
Scale
$69a month, billed yearly
$83 monthly7,500 creditsunlimited seats, client sub-accounts, white label
Enterprisetalk to us50,000+ creditseverything in Scale, plus a contract
EXTRA CREDITS500 for $152,500 for $4910,000 for $14950,000 for $499
Connect one mailbox. See it warm up.14 days money back, and you can take your domains with you.
Start free →
ColdEngine: send from the inboxes you already own