Dux Soup vs La Growth Machine: Which Cold Outreach Tool Is Superior?

I've run outbound for B2B teams where LinkedIn opened the door and email carried the follow-up. When I line up Dux-Soup and La Growth Machine, I keep asking one question: can this tool run both channels as one motion, or am I stitching two campaigns together by hand?

Dux-Soup is a LinkedIn-only automation tool that has been around since 2015. La Growth Machine is a multichannel sequencer from Paris that adds email, calls, and X on top of LinkedIn.

Both do their core job well. But I kept hitting the same walls: no built-in warm-up, no shared inbox across every channel, and pricing that climbs with each seat or identity. That is the focus of this comparison, and where multichannel outreach on Salesforge fits differently.

LinkedIn Outreach Tools at a Glance: Dux-Soup vs La Growth Machine

Here is the short version before the detail. Dux-Soup is single-channel and browser-based on its lower tiers.

La Growth Machine is genuinely multichannel but bills per identity in euros. Salesforge runs email and LinkedIn together with flat pricing and free deliverability tooling.

Dux-Soup Overview: Strengths, Pricing, and Limits

Dux-Soup, built by Supertec BV, is one of the longest-running LinkedIn automation tools on the market. It focuses on one channel: LinkedIn. There is no cold email sending inside Dux-Soup at all.

Core features I tested:

• Automated LinkedIn actions: connection requests, messages to first-degree connections, InMails, endorsements, follows, profile visits, and post likes.
• Drip campaigns: up to 12 actions per campaign with customizable delays (Turbo and Cloud only).
• AI-powered personalization and response assistant: message personalization and a reply assistant on Turbo and above.
• Lead management dashboard: the Dux-Dash tracks campaign statistics and prospect progression.
• CRM integrations: HubSpot, Pipedrive, Salesforce, Freshsales, SharpSpring, HighLevel, Slack, MS Teams, plus Zapier and Make (Turbo and above).
• Data export: download LinkedIn data to CSV; first-degree emails are free, while second-degree emails need Dux-points.

Pricing is per seat across three self-serve tiers, verified on the live Dux-Soup pricing page. Pro Dux is $14.99/mo ($11.25/mo annual), Turbo Dux is $55/mo ($41.25/mo annual), and Cloud Dux is $99/mo ($74.17/mo annual).

A Cloud Agency plan starts at $371/mo for five seats. Every tier offers a 14-day trial.

Dux-Soup is a reasonable fit for a solo operator or a small team that wants affordable, LinkedIn-only outreach and does not need email in the same tool. Its long track record and active community are real assets for cautious buyers, and I'd say so plainly. If you want to scale LinkedIn safely, this guide to rent LinkedIn accounts pairs well with any of these tools.

Where it falls short:

• Pro and Turbo run as a Chrome extension, so your browser (and often your computer) must stay on to send. Only the $99/mo Cloud tier is truly always-on.
• Capterra reviewers report the extension taking heavy processor bandwidth and freezing, with "unresponsive window" prompts during use.
• No email channel, no email warm-up, and no sending infrastructure - LinkedIn is the whole product.
• Per-seat pricing means costs multiply as the team grows.

La Growth Machine Overview: Strengths, Pricing, and Limits

La Growth Machine (LGM) is a French multichannel outbound tool, live since 2017 and built around a visual sequence builder. Unlike Dux-Soup, it is genuinely multichannel: LinkedIn, email, phone calls, and X (Twitter) can run inside one sequence. It is fully cloud-based, with a dedicated mobile proxy per identity.

Core features:

• Multichannel sequences: conditional flows across LinkedIn, email, calls, and X with a drag-and-drop builder (custom sequences are Ultimate-only).
• LinkedIn voice messages: AI-assisted voice notes, a genuine differentiator few tools match.
• Waterfall enrichment: nine email providers plus two verification tools, with a 27M+ company database.
• Multichannel inbox: a unified LinkedIn and email inbox, available on Pro and Ultimate (not Basic).
• Rotating inbox: distribute sends across five email addresses per identity on Pro, ten on Ultimate.
• CRM sync: native HubSpot and Pipedrive on Ultimate; other CRMs via Zapier.

LGM uses per-identity pricing, verified on its live pricing page, where an identity is one sender profile running campaigns. Basic is €60/mo per identity (LinkedIn and email, 250 enriched leads). Pro is €120/mo per identity and adds calls, the rotating inbox, and the multichannel inbox.

Ultimate is also €120/mo per identity and adds X, unlimited campaigns, and CRM sync. Annual billing advertises two months free, so the effective annual rate is roughly €50, €100, and €100/mo respectively.

Agency plans start at a six-identity minimum. A 14-day trial covers every feature except custom sequences.

LGM is a strong fit for a small European team (one to three reps) that wants a slick visual builder, LinkedIn voice notes, and GDPR-by-default hosting. For that bounded case, its EU data residency and French support are real advantages worth paying for.

What reviewers say about La Growth Machine

The praise is consistent, and so are the complaints. On Trustpilot, where LGM's average sits well below its Capterra score, one verified reviewer who paid for 20 identities documented a long list of issues before leaving.

Documented limitations:

• No built-in email warm-up or deliverability protection - reviewers report their own emails landing in spam.
• Bugs and sync errors are the most common complaint across G2 and Trustpilot, including random logouts and dropped LinkedIn replies.
• Per-identity pricing scales aggressively: a three-identity Pro team runs roughly €360/mo before add-ons.
• Billing is euro-only, and the multichannel inbox, X channel, and CRM sync all sit behind higher tiers.

Salesforge Overview: Multichannel Outreach on One Stack

Salesforge is an all-in-one cold outreach platform where email and LinkedIn are two channels of one workflow, not two products bolted together. It is the outreach layer of the wider Forge Stack, which adds sending infrastructure, warm-up, a lead database, and an AI SDR under one login. That "under one roof" design is the core reason to use it.

Core features that matter for this comparison:

• Multichannel conditional sequences: LinkedIn and email steps branch on prospect behavior. If a connection request is accepted, trigger a LinkedIn message; if not, fall back to email.
• Six native LinkedIn actions: connection requests, messages, InMails, post likes, follows, and withdraw requests, each capped at safe daily limits.
• Account safety as standard: actions route through quality proxies with session-token-only auth, so your LinkedIn password is never stored, with no browser-extension injection.
• AI personalization across 21+ languages: AI variables pull company news, LinkedIn activity, and industry context into both channels.
• Free unlimited warm-up: every mailbox is warmed by Warmforge warm-up, using a premium pool of aged IMAP/SMTP, Google Workspace, and Microsoft 365 mailboxes with Heat Score™ monitoring.
• Primebox™ unified inbox: LinkedIn and email replies land in one place, free on every plan, with Autopilot and Co-pilot AI reply modes on Growth.
• LinkedIn email and phone finder: a Chrome extension powered by Leadsforge and its 500M+ contact database, with 100 free credits.
• Unlimited senders and mailboxes: Growth includes unlimited LinkedIn senders and unlimited users - no seat-based pricing.
• Testing and analytics: A/B testing on message variants (Growth), plus campaign analytics covering connect rate, reply rate, and meeting conversion.
• Agent Frank support, integrations, and API: an optional AI SDR, native HubSpot, Salesforce, Pipedrive, Clay, plus API, MCP, and CLI access on Growth.

The Forge Stack is what widens the gap. Salesforge is the outreach layer; Mailforge, Infraforge, and Primeforge supply three infrastructure options, Warmforge handles deliverability, Leadsforge feeds leads, and Agent Frank runs the whole motion autonomously.

Nothing needs Zapier between the products - they sync natively. The stack even runs three ways: your team, Agent Frank, or a vetted Forge Expert agency.

Pricing is flat and usage-based. Pro is $48/mo monthly or $40/mo annual (1 LinkedIn sender, 1 user). Growth is $96/mo monthly or $80/mo annual and unlocks unlimited LinkedIn senders and unlimited users.

An optional AI SDR, Agent Frank, is a separate subscription from $499/mo billed quarterly ($416/mo billed annually) - never bundled into Pro or Growth. Real results back this up: UniteSync hit an 85.26% positive reply rate and a $2.86 CAC on Salesforge, Mailforge, and Warmforge.

Honest limitations: email infrastructure is not included in the base price, so you connect your own mailboxes or add a Forge infrastructure product. Several power features (API, A/B testing, ESP matching, Primebox™ AI, unlimited LinkedIn senders) sit on the Growth plan.

Agent Frank needs a sales-led demo and a two-week warm-up before sending. And Salesforge itself says it is a poor fit for Fortune 500 procurement, long RFP cycles, and six- to seven-figure bespoke deals.

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Head-to-Head Feature Comparison: Dux-Soup vs La Growth Machine

This is where the three tools separate. I've broken it into the six dimensions I actually weigh when picking an outreach platform.

Multichannel outreach in one sequence

Dux-Soup is LinkedIn-only, so there is no multichannel motion inside the product at all. La Growth Machine is properly multichannel across LinkedIn, email, calls, and X, and its visual builder is genuinely good. Salesforge runs email and LinkedIn as one conditional sequence with six native LinkedIn actions, branching on whether a connection is accepted or a message is replied to.

For a fuller field, see this roundup of multichannel outreach tools. If your outbound is LinkedIn-only, Dux-Soup covers it; if you want two channels talking to each other, only LGM and Salesforge qualify here.

Email deliverability and warm-up

This is the clearest gap. Neither Dux-Soup nor La Growth Machine includes email warm-up - Dux-Soup has no email at all, and LGM reviewers report their own emails landing in spam. Salesforge bundles free, unlimited Warmforge warm-up with a premium pool of aged IMAP/SMTP, Google Workspace, and Microsoft 365 mailboxes, plus Heat Score™ monitoring and placement tests.

ChannelCrawler reached an 85.71% positive reply rate running Salesforge with Infraforge and Warmforge. Warm-up as a paid add-on elsewhere is a free default here.

AI and personalization

Dux-Soup offers AI-powered message personalization and a response assistant on Turbo and above. La Growth Machine has an AI writing assistant and its standout AI voice messages on LinkedIn. Salesforge personalizes across 21+ languages using multi-source AI variables, and adds Agent Frank, an autonomous AI SDR who prospects, writes, sequences, and books meetings across email and LinkedIn on his own.

Neither competitor ships an autonomous SDR. For the wider category, this list of LinkedIn AI tools goes deeper.

Inbox and reply management

Dux-Soup has a central inbox, but it only covers LinkedIn. La Growth Machine's multichannel inbox unifies LinkedIn and email, though only on Pro and Ultimate, not Basic.

Salesforge's Primebox™ is free on every plan, unifies email and LinkedIn, captures replies even from a different address than the one contacted, tags sentiment, and offers Autopilot and Co-pilot AI reply drafting on Growth. Reply handling is where deals get lost, so a free unified inbox on the entry plan matters.

Pricing and scalability

On raw entry price for a single LinkedIn user, Dux-Soup Pro at $14.99/mo is the cheapest option here, and for LinkedIn-only solo use it is the simpler, cheaper pick. That changes as the team grows.

Dux-Soup charges per seat and La Growth Machine per identity, so a five-person team pays roughly $495/mo on Cloud Dux or about €600/mo on LGM Pro. Salesforge Growth is a flat $96/mo monthly ($80/mo annual) with unlimited users and unlimited LinkedIn senders - one bill regardless of headcount.

Infrastructure, data, and integrations

Dux-Soup and La Growth Machine both make you bring your own mailboxes; neither sells sending infrastructure. Salesforge offers three infrastructure options under one login - Mailforge (shared), Infraforge (private, dedicated IPs), and Primeforge (Google and Microsoft 365) - plus Leadsforge's 500M+ contact database feeding sequences directly.

All three tools integrate with HubSpot and Pipedrive; Salesforge adds Salesforce, Clay, an open API, an MCP server, and a CLI on Growth. The breadth is the point: it replaces a stitched-together stack.

Pricing Comparison: Dux-Soup, La Growth Machine, and Salesforge

Headline prices only tell you the start. Here is how the three compare on plans, then what a real team actually pays.

Costs diverge fastest with team size. Dux-Soup and La Growth Machine both scale linearly - every new seat or identity is another line item - while Salesforge Growth holds flat as you add users and LinkedIn senders. Note the shared plan names too: Dux-Soup Pro ($14.99/mo) and Salesforge Pro ($48/mo) are very different products, and so are LGM Pro and Salesforge Growth.

A concrete scenario. Say five reps run LinkedIn plus email outreach. On Cloud Dux you'd need five always-on seats at $99/mo, about $495/mo, and you'd still have no email channel.

On La Growth Machine Pro that's five identities at €120/mo, roughly €600/mo. On Salesforge Growth it's a flat $96/mo monthly ($80/mo annual) for unlimited users, unlimited LinkedIn senders, unlimited mailboxes, free warm-up, and Primebox™. The gap widens with every seat you add.

Who Should Use Which Outreach Tool

None of these tools is wrong for everyone. Here is how I'd route the decision.

You might consider Dux-Soup if:

• Your outbound is LinkedIn-only and you want the cheapest simple entry point - Pro Dux at $14.99/mo is genuinely lower-cost than the alternatives here.
• You are a solo operator comfortable keeping a browser open, or you'll pay $99/mo for the always-on Cloud tier.
• You value a long track record and an active user community over breadth.

You might consider La Growth Machine if:

• You are a small EU or French team that wants multichannel sequences with LinkedIn voice notes and GDPR-by-default hosting.
• You have one to three reps and the per-identity math still works at your size.
• You want a polished visual sequence builder and can bring your own mailboxes and warm-up.

Choose Salesforge if:

• You sell B2B with ACVs of $5K–$100K to SMB or mid-market buyers and target 3,000+ businesses.
• You want email and LinkedIn in one conditional sequence, not two campaigns stitched together.
• You need free deliverability tooling and infrastructure options built in, not bolted on.
• You're scaling a team and refuse to pay per seat or per identity as you grow.
• You want the option of an AI SDR (Agent Frank) running the motion end to end.

Comparing more LinkedIn tools? The Expandi vs Skylead breakdown and the full comparison library cover the wider field, and the sales tools directory maps the rest.

Final Verdict: Choosing Your Multichannel Outreach Tool

Dux-Soup and La Growth Machine are good at their core jobs. Dux-Soup is a mature, affordable LinkedIn-only tool, best for a solo operator who lives in one channel.

La Growth Machine is a genuinely multichannel sequencer with excellent voice notes, best for a small EU team that brings its own mailboxes. Neither ships free warm-up, an AI SDR, or its own infrastructure, and both scale by charging per seat or per identity.

For multichannel B2B outbound that has to scale, Salesforge is the tool I'd pick. Email and LinkedIn run in one conditional sequence, warm-up is free and unlimited through Warmforge, replies land in a free unified Primebox™ inbox, and Growth stays flat at $96/mo monthly ($80/mo annual) with unlimited users and LinkedIn senders. Add an optional AI SDR with Agent Frank and the whole motion can run itself.

One falsifiable benchmark to hold Salesforge to: UniteSync ran Salesforge with Mailforge and Warmforge to an 85.26% positive reply rate and a $2.86 CAC. That case study is public. For the deeper playbook, this guide to LinkedIn outreach shows how the channels reinforce each other.

Frequently Asked Questions

Is Salesforge better than Dux-Soup or La Growth Machine?

For multichannel B2B outbound that scales, yes. Salesforge runs email and LinkedIn in one conditional sequence, includes free unlimited Warmforge warm-up and a free Primebox™ unified inbox, and prices flat rather than per seat or per identity. Dux-Soup is stronger only for LinkedIn-only solo use at its $14.99/mo entry price, and La Growth Machine is a fair pick for small EU teams that want voice notes. Neither offers warm-up, an AI SDR, or sending infrastructure.

What's the main difference between Salesforge, Dux-Soup, and La Growth Machine?

Channel coverage and what's included. Dux-Soup is LinkedIn-only. La Growth Machine is multichannel (LinkedIn, email, calls, X) but makes you bring your own mailboxes and has no warm-up. Salesforge runs email and LinkedIn together and adds free Warmforge warm-up, three infrastructure options, a 500M+ Leadsforge database, and an optional AI SDR (Agent Frank) - the full Forge Stack under one login.

Which is cheaper: Dux-Soup, La Growth Machine, or Salesforge?

For a single LinkedIn user, Dux-Soup Pro at $14.99/mo ($11.25/mo annual) is cheapest. But it charges per seat and La Growth Machine per identity (€60–€120/mo each), so costs climb with team size. Salesforge Growth is a flat $96/mo monthly ($80/mo annual) for unlimited users and LinkedIn senders, which usually wins for any team of three or more running both channels.

Does Dux-Soup support email outreach?

No. Dux-Soup is a LinkedIn automation tool only - there is no cold email sending inside the product. You can export first-degree emails to CSV (second-degree emails require Dux-points), but you'd need a separate email tool to send. Salesforge runs email and LinkedIn in the same sequence, so you don't have to stitch two platforms together.

Does La Growth Machine include email warm-up?

No. La Growth Machine has no built-in email warm-up or deliverability protection, and some reviewers report their own emails landing in spam. You'd need a separate warm-up tool. Salesforge includes Warmforge free and unlimited on every plan, with a premium pool of aged IMAP/SMTP, Google Workspace, and Microsoft 365 mailboxes plus Heat Score™ monitoring.

Can I switch from Dux-Soup or La Growth Machine to Salesforge easily?

Yes. You can import leads by CSV, connect your existing mailboxes and LinkedIn accounts, and rebuild sequences in Salesforge, usually in under a day per several reviewers. Salesforge also offers a 14-day free trial with no credit card, so you can run a test campaign alongside your current tool before committing. Warm-up starts immediately at no extra cost.

Which tool has better email deliverability?

Salesforge, clearly, because it's the only one of the three with built-in deliverability tooling. Warmforge warm-up, mailbox rotation, ESP matching, and placement tests are included, and you can add dedicated infrastructure via Infraforge or Primeforge. Dux-Soup has no email, and La Growth Machine has no warm-up. ChannelCrawler reached an 85.71% positive reply rate on Salesforge, Infraforge, and Warmforge.

Does Salesforge offer a free trial?

Yes. Salesforge offers a 14-day free trial with no credit card required. The trial includes up to 50 contacts, 100 emails, and warm-up plus unlimited mailbox connections, so you can test real deliverability before paying. Dux-Soup and La Growth Machine also offer 14-day trials, though Agent Frank, Salesforge's AI SDR, needs a demo and a two-week warm-up rather than a self-serve trial.