Warmerly
Email warmup, then cold email from the warmed mailboxes. LinkedIn is a paid add-on.
Warmerly
Dux-Soup
One-to-one · Main job
Main job
One row, in depth: what each tool does, the verified numbers, and who each suits.
Dux-Soup details read from its pricing page, home page, integrations and feature pages and help centre on 22 October 2026.
Warmerly
Email warmup, then cold email from the warmed mailboxes. LinkedIn is a paid add-on.
Dux-Soup
LinkedIn automation: drip campaigns of LinkedIn actions. No email outreach is listed.
The short answer
Main job, in one look.
Warmerly is email first, with LinkedIn as a $19 a month add-on. Dux-Soup, now sold as STACKED, automates LinkedIn: drip campaigns of LinkedIn actions, run from a desktop app or its cloud. Its home and pricing pages list no email outreach. The useful question is which channel carries your outreach. Last checked 22 October 2026.
Dux-Soup
LinkedIn automation: drip campaigns of LinkedIn actions. No email outreach is listed.
The picture
Drawn side by side.
What each is built around
The product's own description of itself
WarmerlyDux-Soup
Email first, LinkedIn as an add-on
- Main channel: Email, with LinkedIn as an add-on
- Mailbox warmup: 4 a day on day 0 to 50 a day on day 30
LinkedIn only, no email listed
- Main channel: LinkedIn
- Email in the same sequence as LinkedIn: Not listed
Dux-Soup's home and pricing pages describe LinkedIn drip campaigns and list no email outreach. Warmerly's LinkedIn is a paid add-on at $19 an account.
One sequence, two tools
A sample order of steps, as each product describes its own
WarmerlyDux-Soup
Warmerly
Warm the mailboxCheck DNSEmail stepsLinkedIn steps (add-on)Reply inbox
Dux-Soup
VisitConnectMessageFollow upA reply stops it
A sample order, not a recommended cadence. Dux-Soup's drip campaigns hold up to 12 actions; its pages list no mailbox warmup.
How Warmerly does it
Warmerly, in detail.
Warmerly's main job is email: warm a mailbox over 30 days, keep its DNS and blocklist status checked, then send cold email sequences from it. LinkedIn is a paid add-on that plugs into the same sequences.
01
It starts with the mailbox
Warmup mail between real mailboxes ramps from 4 a day on day 0 to 50 a day on day 30, with lower ceilings for Gmail (40), Outlook (30) and Zoho (25). A mailbox only does campaign work on top of that ramp.
Warmerly product, checked 22 October 2026
02
Then campaigns and sequences
A sequence is made of email steps, wait steps, LinkedIn connection and message steps, and condition steps that branch on opened, clicked, replied or timeout. A campaign sends at most 30 emails a day from a mailbox by default and runs pre-launch checks before it starts (13 kinds are listed in the code).
Warmerly product, checked 22 October 2026
03
DNS and blocklists are watched
SPF, DKIM, DMARC and MX are checked every six hours for each mailbox, with a written fix when one fails. Sixteen blocklists are checked on the same schedule.
Warmerly product, checked 22 October 2026
04
LinkedIn is an add-on, not the core
Each connected LinkedIn account is $19 a month, charged at once with no trial and no refund. Packs are 3 accounts for $49 and 5 for $75. It runs through a hosted provider (LinkupAPI), and a customer can connect an account because the production switch was on when we read it on 15 October 2026.
Warmerly product, checked 22 October 2026
05
Where Warmerly is narrower on LinkedIn
Warmerly's LinkedIn sequence steps are a connection request and a message. We found no step that visits a profile, follows, endorses or sends an InMail, and no signal that adds people from profile or company visits. Its LinkedIn depends on one hosted provider.
Warmerly product, checked 22 October 2026
06
Replies and unsubscribes are handled for you
A genuine reply stops that lead's sequence by default, and every unsubscribe goes on a workspace-wide suppression list that is checked immediately before each email.
Warmerly product, checked 22 October 2026
07
An API and an MCP server for the rest
Agency plans get an API with signed webhooks about mailbox health, and every plan has an MCP server for AI assistants. We found no CRM connector.
Warmerly product, checked 22 October 2026
How Dux-Soup does it
Dux-Soup, in detail.
Dux-Soup is LinkedIn automation and nothing else on the pages we read. It runs as a desktop app or in its cloud and is priced per seat.
01
What it describes itself as
Its home page presents STACKED as LinkedIn outreach: drip campaigns, AI personalisation, campaign insights, a unified response inbox and connections to your other tools.
dux-soup.com · read 22 October 2026
02
Drip campaigns of LinkedIn actions
Its pricing page says campaigns hold up to 12 actions drawn from Endorse, Follow, InMail, Connect, Message, Visit and Like a post.
dux-soup.com/pricing · read 22 October 2026
03
Two ways to run it
STACKED local runs on your own machine as a desktop app for Mac and Windows. STACKED cloud runs on Dux-Soup's infrastructure, which the page calls managed and monitored.
dux-soup.com/pricing · read 22 October 2026
04
Across LinkedIn, Sales Navigator and Recruiter
Its home page says the response inbox gathers replies from LinkedIn, Sales Navigator and Recruiter in one place.
dux-soup.com · read 22 October 2026
05
A new name on an old brand
The product is now sold as STACKED, while its help centre still uses the Dux-Soup name in places, for example in the article 'Is it safe to use Dux-Soup?'.
support.dux-soup.com · read 22 October 2026
06
A claim of 300,000 customers
Its home page says 'Trusted by 300,000+ customers worldwide' with a row of company logos. The page does not say how the figure is counted or whether each logo is a customer.
dux-soup.com · read 22 October 2026
07
Three audiences, one product
Its pages are written for individuals, teams and agencies, and name five industries: SaaS and technology, recruitment and HR, professional services, marketing agencies and finance.
dux-soup.com · read 22 October 2026
08
It can be driven from an AI assistant
The home page says you can control outreach from your favourite AI assistant, and its individual plan text mentions AI and MCP capability. How that works is not explained on the pages we read.
dux-soup.com · read 22 October 2026
09
Seven feature areas
The feature list is drip campaigns, messaging, profile engagement, inbox and replies, analytics, lead management and account safety.
dux-soup.com · read 22 October 2026
What Dux-Soup does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- Email outreach, email steps or sending mailboxes
- A mailbox warmup feature
- How the 300,000 customer figure is counted
- What its AI assistant control can and cannot do
Where the sources disagree
We report each version rather than pick one.
- Its home page plan summaries say unlimited campaigns and outreach activity, while its help centre sets recommended daily limits and its safety page says STACKED snoozes at the daily limit. The pages do not say how the two fit.
The numbers
Only what we could verify.
| Measure | Warmerly | Dux-Soup |
|---|---|---|
| Main job | Email warmup, then cold email from the warmed mailboxes. LinkedIn is a paid add-on. | LinkedIn automation: drip campaigns of LinkedIn actions. No email outreach is listed. |
| Main channel | Email, with LinkedIn as an add-on | |
| Email in the same sequence as LinkedIn | Yes, with the LinkedIn add-on | Not listed |
| Entry price | $19 a month on Starter, or $0 Free | $55 a seat a month on STACKED local |
| Mailbox warmup | 4 a day on day 0 to 50 a day on day 30 | Not listed |
| Audiences named | Agencies and sales teams that send email, plus LinkedIn users | Individuals, teams and agencies |
| Feature areas on its home page | Not applicable | 7: drip campaigns, messaging, profile engagement, inbox, analytics, lead management, account safety |
| Channels in the main product | Email, with LinkedIn and WhatsApp steps | LinkedIn, Sales Navigator and Recruiter |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
If LinkedIn is the whole job, start with Dux-Soup's pages
It is built around LinkedIn actions, account-type defaults and a local or cloud choice. Warmerly's LinkedIn is two steps in a campaign.
If the email step is where replies come from, look at the mailbox
Dux-Soup lists no email sending, so the mailbox, its warmup and its DNS are the part it does not cover.
Running both is possible
Keep LinkedIn in Dux-Soup and connect the sending mailbox to Warmerly to warm it and watch its DNS. Nothing needs migrating.
A recruiter reaching candidates on LinkedIn
If every conversation happens on LinkedIn, Dux-Soup is built for that job and lists InMail, Open Profile messages and a Recruiter inbox. Warmerly's two LinkedIn steps cover a connection request and a message only.
A sales team with an email list
If the list is email addresses, Dux-Soup has nowhere to send them, since no email step is listed. Warmerly warms the mailbox for 30 days, from 4 a day to 50, before its cold sending is at full strength.
A team that wants both
Run Dux-Soup for LinkedIn and connect the mailboxes you send from to Warmerly. The two do not share leads automatically, and neither reads the other's inbox, so a reply on one channel does not stop the sequence on the other.
Reading the claims
Both pages above are what each company says about itself. Treat the 300,000 customer claim and any response rate as marketing until you see the method.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- Cold email is a channel you run or want to run
- The mailboxes need warming and their DNS watched
- You want one flat price for mailboxes, not a price per seat
- Email is your main channel and LinkedIn is the extra
- You want the mailbox warmed and checked before it sends
- You want one tool for warmup, sending and a database
Dux-Soup
Dux-Soup is the better fit if
- LinkedIn is your only outreach channel
- You want the LinkedIn actions and defaults Dux-Soup lists
- You want a desktop app on your own machine as an option
- LinkedIn is the whole job
- You want InMail, endorsements, follows and Recruiter support
- You want to run campaigns from your own machine or its cloud
Questions
Is Warmerly a Dux-Soup alternative?
For the email half, there is nothing to replace: Dux-Soup lists no email outreach. For LinkedIn depth, Dux-Soup goes further, with seven actions and defaults by account type, while Warmerly adds LinkedIn as a $19 a month add-on.
Does Dux-Soup do email outreach?
We found none. Its home and pricing pages list LinkedIn actions only. It may offer something we did not find, so check with them.
Is Dux-Soup the same as STACKED?
Yes. Dux-Soup is the company and the product is now sold as STACKED, though its help centre still uses the Dux-Soup name in places.
Can I use both Dux-Soup and Warmerly?
Yes, and plenty of teams will. Dux-Soup runs LinkedIn, Warmerly warms the mailbox and sends email. They are separate accounts with no sync between them.
Does Warmerly replace Dux-Soup?
Not for LinkedIn-heavy work. Warmerly's LinkedIn add-on is lighter, with a connection request step and a message step.
Sources
Dux-Soup pages were read on 22 October 2026. Plans and wording change, so check the vendor's own page before you decide. Warmerly details come from the product as it runs today.
More features
See it on your own mailbox.
Connect a mailbox. Warmerly runs alongside whatever you send from now, so you can compare before you move anything.
Free plan, no card. Paid plans: 7-day trial, first charge on day 8.