Top 10 Multi-Channel Campaign Builders for B2B Marketers in 2025

The $7 Billion Question: Why Multi-Channel Engagement Matters More Than Ever

Here is a stat that should reframe how you think about outreach: campaigns using three or more channels achieve 287% higher purchase rates compared to single-channel strategies, according to Landbase's analysis of multi-channel outreach data. Meanwhile, the global sales engagement platform market has grown to over $7 billion in 2025, with 75% of sales teams already using some form of engagement technology.

The reason is simple: B2B buyers don't live in one channel. They check email in the morning, scroll LinkedIn at lunch, take calls in the afternoon, and read Slack messages between meetings. If your outreach only meets them in one of those places, you are leaving pipeline on the table.

But "just use more channels" is not a strategy. The real challenge is orchestrating those channels so each touchpoint builds on the last -- without drowning your reps in tab-switching and manual follow-ups. That is exactly what multi-channel campaign builders are designed to solve.

Gartner underscored this shift in December 2025 when it published its first-ever Magic Quadrant for Revenue Action Orchestration, renaming the old "Sales Engagement" category to reflect the convergence of engagement, intelligence, and automation into unified platforms. The message is clear: isolated point solutions are out; orchestrated, multi-channel systems are in.

This guide compares 10 platforms that B2B sales and marketing teams actually use for multi-channel campaign execution. For each, I include real pricing (as of early 2026), supported channels, strengths, limitations, and who it fits best. No generic overviews -- just the information you need to make a decision.

How to Evaluate a Multi-Channel Campaign Builder

Before diving into specific tools, it helps to know what separates a good platform from a great one. Here are the five dimensions that matter most:

1. Channel Coverage

At minimum, you want email and LinkedIn. Increasingly, top platforms also support phone/dialer, SMS, WhatsApp, and video. The more channels natively supported, the less tool-switching your reps endure.

2. Sequence Logic and Branching

Can you build if/then sequences? (e.g., "If they open the email but don't reply, send a LinkedIn connection request on day 3.") Basic platforms offer linear sequences. Advanced ones offer conditional branching, A/B testing, and AI-driven step optimization.

3. Personalization Depth

Merge fields are table stakes. Look for AI-generated personalization, dynamic content blocks, and the ability to pull in buyer signal data data (job changes, funding, hiring activity) that makes each message genuinely relevant. According to Belkins' study of 16.5 million cold emails, personalized outreach achieves 18% reply rates versus 9% for generic templates.

4. Deliverability Infrastructure

Email volume means nothing if messages land in spam. Evaluate whether the platform includes warm-up, domain health monitoring, sending limits management, and inbox rotation. Martal's 2025 cold email benchmarks show that average reply rates have dipped to 5.8% (from 6.8% in 2023), partly due to tighter spam filters from Gmail and Microsoft.

5. CRM Integration and Reporting

The platform should sync bidirectionally with your CRM (Salesforce, HubSpot, etc.) so reps do not need to log activity manually. Reporting should track engagement across channels in a unified view -- not per-channel silos.

10 Multi-Channel Campaign Builders Compared

1. Outreach -- The Enterprise Standard

Channels: Email, phone (built-in dialer), LinkedIn (via tasks), SMS, video
Pricing: ~$100/user/month (annual contract required); custom quotes for enterprise. Vendr reports a 50-user deployment averages ~$72K/year.
Best for: Mid-market to enterprise sales teams (50+ reps) with Salesforce

Outreach is one of two platforms Gartner named a Leader in its 2025 Magic Quadrant for Revenue Action Orchestration. Its sequence builder supports multi-step, multi-channel flows with conditional branching, A/B testing, and AI-suggested send times. The built-in dialer is solid, and the platform's Salesforce integration is among the deepest in the market.

Limitations: No native LinkedIn automation (uses manual tasks instead). Pricing is opaque and requires sales conversations. The learning curve is steep for smaller teams. Minimum seat requirements can price out startups.

2. Salesloft -- The Visionary Challenger

Channels: Email, phone (built-in dialer), LinkedIn (tasks), video, direct mail integrations
Pricing: Estimated $75-$175/user/month depending on plan tier; Vendr data suggests annual costs of $20K-$120K depending on team size. Dialer is an additional ~$200/user/year.
Best for: Revenue teams wanting engagement + conversation intelligence in one platform

Salesloft was named a Visionary in Gartner's 2025 Magic Quadrant for RAO and then merged with Clari (the category Leader), creating a combined engagement + revenue intelligence powerhouse. A Forrester Total Economic Impact study found organizations using Salesloft achieved 329% ROI over three years and $7.2 million in value.

Limitations: Like Outreach, LinkedIn automation is task-based (no auto-connect or auto-message). Pricing is not transparent. The Clari merger is still integrating, so the product roadmap may shift.

3. Apollo.io -- Best Value for Growing Teams

Channels: Email, phone (built-in US dialer on Pro+), LinkedIn (tasks)
Pricing: Free plan available. Basic at $49/user/month, Professional at $79/user/month, Organization at $119/user/month (annual billing). See Apollo pricing.
Best for: Startups and growth-stage teams that want prospecting data + engagement in one platform

Apollo's killer advantage is combining a 210M+ contact database with a full-featured sequencing engine. You can find prospects, enrich them, and enroll them in multi-step sequences without leaving the platform. The Professional plan unlocks the built-in dialer and call recording. Apollo integrates with Salesforce, HubSpot, and Pipedrive, and its G2 reviews consistently praise the data quality-to-price ratio.

Limitations: LinkedIn outreach is manual task-based (no native automation). The credit system for data access can get expensive at scale. The dialer is US-only on Professional; international dialer requires the Organization plan. Enterprise-grade governance features are limited compared to Outreach/Salesloft.

4. Lemlist -- Best for LinkedIn + Email Automation

Channels: Email, LinkedIn (automated connection requests, profile visits, messages), phone (via integrations), WhatsApp
Pricing: Email Pro at $69/user/month, Multichannel Expert at $99/user/month, Enterprise custom. See Lemlist pricing. Unlimited email sending on all plans.
Best for: SDR/BDR teams running high-volume LinkedIn + email sequences

Lemlist is one of the few platforms that natively automates LinkedIn actions (not just tasks). You can build sequences that automatically visit profiles, send connection requests with personalized notes, and follow up via InMail or email -- all from one workflow. Their AI personalization generates custom opening lines, and the platform's deliverability features (warm-up, domain rotation) are well-regarded. A 15,000-email test by Hackceleration found Lemlist's warm-up system effective at maintaining inbox placement.

Limitations: The lead database (integrated lead finder) uses a credit system that can add up. No native dialer -- phone steps require third-party integrations. The UI, while functional, is not as polished as Outreach or Salesloft.

5. Instantly.ai -- Best for High-Volume Cold Email

Channels: Email (primary), with basic CRM and lead management
Pricing: Growth Outreach at $37/month (5,000 emails/month), Hypergrowth at $97/month, Light Speed at $358/month. Separate pricing for CRM ($47-$97/month) and Lead Finder ($47-$197/month). See Instantly pricing.
Best for: Agencies and solo founders running high-volume cold email campaigns

Instantly made its name by solving email deliverability at scale. Unlimited email accounts and warm-up on every plan, a one-click domain health tester, and aggressive pricing make it the go-to for teams sending thousands of cold emails monthly. Their reply rate benchmarks and deliverability tooling are genuinely useful resources.

Limitations: This is primarily an email tool, not a true multi-channel platform. No built-in dialer, no native LinkedIn automation, no SMS. The CRM and lead finder are separate products with separate pricing, so total costs can exceed expectations. SalesHandy's pricing breakdown warns to budget 3-5x the base plan when factoring in add-ons.

6. Reply.io -- Best for Channel Breadth

Channels: Email, LinkedIn, phone, SMS, WhatsApp
Pricing: Free plan (200 data credits). Starter at $49/user/month (email only, 1 mailbox). Professional at $89/user/month (multichannel, 5 mailboxes). Agency plans from $166/month. See Reply.io pricing.
Best for: Teams that want true multi-channel (including WhatsApp and SMS) in a single workflow

Reply.io covers more outbound channels natively than most competitors. The Professional plan unlocks email, LinkedIn, phone, SMS, and WhatsApp in unified sequences. Their AI personalization (called Jason AI) generates opening lines and handles basic reply classification. The platform also includes a B2B data layer for lead discovery.

Limitations: The pricing gets expensive for what you get compared to Apollo or Lemlist. The free plan is extremely limited. Some users on G2 report that the LinkedIn automation can be inconsistent. Deliverability infrastructure is less mature than Instantly or Lemlist.

7. Smartlead -- Best for Agencies and White-Label

Channels: Email (primary), LinkedIn, Twitter, WhatsApp (via integrations)
Pricing: Basic at $39/month (2,000 active leads, 6,000 emails), Pro at $94/month (30,000 leads, 150,000 emails), Custom from $174/month. See Smartlead pricing.
Best for: Lead gen agencies managing multiple client accounts

Smartlead's unified inbox ("Unibox") and multi-channel sequencing consolidate all outreach and responses into one view. The white-label capabilities and client-level account management make it popular with agencies. Unlimited email accounts and warm-up are included on all plans, similar to Instantly.

Limitations: Multi-channel support beyond email (LinkedIn, WhatsApp) relies on integrations rather than native features. The real cost is higher than advertised once you add necessary integrations and add-ons. Capterra reviews note a learning curve for the campaign setup process.

8. Mixmax -- Best for Gmail-Native Teams

Channels: Email (Gmail-native), phone (via integrations), in-email polls/surveys/scheduling
Pricing: Free plan available. SMB at $29/user/month, Growth at $49/user/month, Growth + CRM at $69/user/month. See Mixmax pricing.
Best for: AEs and CSMs who live in Gmail and want lightweight sequencing with interactive email features

Mixmax operates as a Gmail overlay, adding sequences, tracking, scheduling, and interactive elements (polls, surveys, embedded calendars) directly inside your inbox. It is more email productivity tool than full sales engagement platform, but that is the point: for teams that do not need a dialer or LinkedIn automation, Mixmax gets reps productive fast with minimal workflow disruption. G2 reviewers praise its ease of adoption.

Limitations: Gmail only -- no Outlook support. Limited multi-channel capabilities (no native LinkedIn, SMS, or dialer). Salesforce integration requires the $69/month tier. Not built for high-volume outbound or SDR workflows.

9. La Growth Machine -- Best for European and LinkedIn-First Teams

Channels: LinkedIn (automated), Email, Twitter/X
Pricing: Basic at ~$50/user/month, Pro at ~$80/user/month (annual billing). See LGM pricing. 14-day free trial, no credit card required.
Best for: European B2B teams with LinkedIn-heavy prospecting workflows

La Growth Machine (LGM) was purpose-built for multi-channel prospecting with native LinkedIn automation at its core. You can build sequences that combine automated LinkedIn actions (profile visits, connection requests, messages) with email and Twitter touchpoints. The platform includes unlimited enrichment and a centralized multi-channel inbox. LGM is especially popular with European SaaS companies.

Limitations: No native phone/dialer support. The platform is less well-known in the US market, with a smaller community and fewer integrations than US-based competitors. Twitter/X automation is niche and less useful for most B2B workflows.

10. HubSpot Sales Hub -- Best for Marketing-Sales Alignment

Channels: Email, phone (via HubSpot Calling), LinkedIn (tasks via Sales Navigator integration), live chat, meetings
Pricing: Free tools available. Starter at $20/user/month, Professional at $100/user/month (minimum 5 seats = $500/month), Enterprise at $150/user/month (minimum 10 seats). See HubSpot pricing.
Best for: Teams already on HubSpot CRM that want native engagement without adding another vendor

HubSpot Sales Hub's main strength is seamless integration with HubSpot's marketing, service, and CMS hubs. Sequences, email templates, a calling tool, meeting scheduler, and deal pipeline management are all built into the same CRM reps already use. For organizations investing in inbound-led outbound (marketing generates interest, sales follows up with multi-touch sequences), HubSpot eliminates the data gaps that plague CRM + separate engagement tool setups.

Limitations: Sequences are limited compared to Outreach or Salesloft (less sophisticated branching logic). LinkedIn automation is not native. The Professional tier's 5-seat minimum means solo reps or tiny teams pay for seats they may not use. Enterprise features (predictive lead scoring, custom objects) require the $150/seat tier.

Quick Comparison: Pricing and Channels at a Glance

Here is a summary to help you narrow down candidates before deeper evaluation:

• Under $50/user/month: Instantly ($37), Smartlead ($39), Mixmax ($29-$49), Apollo Basic ($49), Reply.io Starter ($49)
• $50-$100/user/month: Apollo Pro ($79), Lemlist ($69-$99), La Growth Machine ($50-$80), Reply.io Pro ($89), HubSpot Pro ($100)
• $100+/user/month: Outreach (~$100+), Salesloft (~$75-$175), Apollo Org ($119), HubSpot Enterprise ($150)

Native LinkedIn automation: Lemlist, La Growth Machine, Reply.io
Built-in dialer: Outreach, Salesloft, Apollo (Pro+), HubSpot
WhatsApp/SMS support: Lemlist, Reply.io, Smartlead (via integrations)
Unlimited email accounts: Instantly, Smartlead

How to Choose: A Framework for Your Team

With 10 solid options, the decision ultimately depends on four factors:

Team Size and Budget

Solo founders and agencies should look at Instantly, Smartlead, or Apollo's free tier. Growing SDR teams (5-20 reps) get the most value from Apollo Pro, Lemlist, or Reply.io. Enterprise orgs (50+ reps) with Salesforce should evaluate Outreach and Salesloft seriously.

Channel Priority

If LinkedIn is your primary channel, Lemlist or La Growth Machine are the strongest. If phone is critical, Outreach or Salesloft have the most mature dialers. If you are email-only at high volume, Instantly or Smartlead are purpose-built for that. If you need everything (email + LinkedIn + phone + SMS), Reply.io covers the most ground natively.

Existing Tech Stack

Already on HubSpot CRM? HubSpot Sales Hub avoids a new vendor. On Salesforce? Outreach and Salesloft have the deepest integrations. Using no CRM yet? Apollo bundles its own. This matters more than features, because the Gartner Peer Insights reviews consistently show that integration quality is the top driver of satisfaction (or frustration) with engagement platforms.

Signal Data and Personalization

The platforms above handle sequence execution well, but most depend on external data to make those sequences actually relevant. Tools like Autobound layer signal intelligence -- job changes, funding rounds, competitor mentions, hiring surges -- on top of your engagement platform so every first touch references something the prospect actually cares about. Autobound integrates natively with both Salesloft and Outreach, feeding AI-personalized messages directly into your sequences.

The Trend to Watch: From Engagement to Orchestration

The biggest shift in this space is not a new tool -- it is a category redefinition. Gartner's creation of the Revenue Action Orchestration category signals that the industry is moving beyond "send emails and log calls" toward platforms that use AI to decide which action to take, when, and on which channel -- automatically.

Practically, this means:

• AI-driven step selection -- Instead of reps choosing the next step, the platform analyzes engagement signals and routes to the highest-probability channel.
• Revenue intelligence integration -- Deal health scoring, pipeline forecasting, and engagement data converge in one view. The Clari + Salesloft merger is the clearest example.
• 60% of organizations are expected to use AI-enabled sales engagement by 2026, according to industry analysis of the market.

For buyers evaluating platforms today, the practical takeaway is: choose a platform that has a credible AI roadmap, not just current features. The tools that win in 2027 will be the ones investing in orchestration intelligence now.

Putting It All Together

Multi-channel campaign builders are no longer optional for B2B teams that want to hit quota. The data is unambiguous: multi-channel sequences outperform single-channel by 287%, personalized outreach doubles reply rates, and the platforms that orchestrate these channels are delivering 329% ROI.

But the platform is only half the equation. The other half is the intelligence that determines what you say in each touchpoint. The best multi-channel campaigns are not just automated -- they are informed by real-time signals about what each prospect cares about right now. That combination of orchestration and intelligence is where the real pipeline growth happens.

Start by narrowing this list to 2-3 platforms that match your budget, channel needs, and tech stack. Run a 14-day trial with real sequences. Measure reply rates, meetings booked, and rep adoption -- not just feature checklists. The right tool is the one your team actually uses every day.