Finding the right outbound marketing agency can be the difference between a predictable pipeline of qualified leads and endless cold outreach that goes nowhere. Whether you’re a B2B SaaS company looking to fill your sales calendar or a services business that wants consistent deal flow, partnering with a top outbound agency helps you scale faster without the internal overhead.

In this guide, we’ve evaluated dozens of firms that specialize in lead generation, cold outreach, and appointment setting to help you find the perfect fit.

Here are the 10 best outbound marketing agencies ranked and reviewed.

How We Chose the Best Outbound Marketing Agencies

To create this list, we reviewed each agency based on the following criteria:

• Proven results: measurable ROI, booked meetings, or revenue growth.
• Industry specialization: experience in SaaS, tech, or professional services.
• Personalization quality: level of targeting and message customization.
• Technology & integrations: CRM, automation, and data enrichment stack.
• Transparency & reporting: how clearly performance is communicated.
• Scalability: ability to support growing or enterprise teams.

Best Outbound Marketing Agencies Comparison Table

The 10 Best Outbound Marketing Agencies Reviewed

1. SalesCaptain

Best for: B2B companies that want a predictable outbound engine built on data and real personalization.

SalesCaptain builds high performing outbound programs for SaaS teams, agencies, and B2B service businesses. They use AI, Clay workflows, and human level research to create messages that feel personal at scale. Instead of blasting templates, they tailor every touch to the lead’s context, intent, and pain points. The result is a pipeline that grows consistently, not randomly.

Key Services:

• Personalized outbound email sequences
• AI powered research and enrichment
• LinkedIn outreach and multichannel workflows
• ICP targeting and data sourcing
• Full meeting booking and CRM handoff
• Lead generation
• Clay workflows
  
  

Why We Like It: SalesCaptain delivers outbound that actually converts. They own the full process from data to message to booked meeting, and they refine it weekly. This creates a system that stays sharp instead of burning out, making it one of the most reliable choices for B2B teams that want consistent sales conversations.

2. AnyBiz

Best for: SaaS and tech companies scaling outbound with automation.

AnyBiz delivers fully automated yet personalized outbound campaigns powered by AI. Its platform dynamically adapts to each prospect, optimizing timing and messaging for higher reply rates.

Key Services:

• Multi-channel automation (email, LinkedIn, phone)
  
  
• AI-driven personalization and deliverability management
  
  
• Built-in analytics dashboard
  
  

Why We Like It: AnyBiz combines the best of automation with a human-like approach, enabling startups to scale outreach efficiently without losing relevance.

3. Martal Group

Best for: Mid-market B2B companies seeking end-to-end outbound management.

Martal Group offers a team of experienced SDRs, account executives, and strategists who integrate directly with your sales process. They handle everything from strategy to booked meetings.

Key Services:

• Lead sourcing and qualification
  
  
• SDR and AE outsourcing
  
  
• CRM integration and reporting
  
  

Why We Like It: Martal’s hands-on approach and proven track record with B2B tech clients make it ideal for companies ready to delegate outbound entirely.

4. Growthonics

Best for: Data-driven startups needing scalable lead research and outreach.

Growthonics combines data accuracy with scalable outreach execution. Their process ensures every campaign starts with validated contact data and messaging tested for conversions.

Key Services:

• Data enrichment and segmentation
  
  
• Multi-step email sequences
  
  
• Campaign analytics and reporting
  
  

Why We Like It: Growthonics’ strength lies in precision — they focus on clean, relevant data and consistent follow-ups that generate predictable results.

5. SeeResponse

Best for: B2B SaaS and enterprise clients needing multi-channel outbound.

SeeResponse offers full-service B2B marketing, with a strong emphasis on outbound strategies that integrate email, LinkedIn, and paid campaigns.

Key Services:

• Account-based marketing (ABM)
  
  
• Cold email and LinkedIn campaigns
  
  
• Content creation and conversion tracking
  
  

Why We Like It: SeeResponse bridges the gap between marketing and sales, delivering integrated campaigns that support the full customer journey.

6. Leadium

Best for: Growth-stage startups ready to scale pipeline predictably.

Leadium provides outsourced SDR services powered by a trained US-based team. They focus on quality conversations, strong ICP alignment, and seamless CRM integration.

Key Services:

• Dedicated SDR teams
  
  
• Email, LinkedIn, and phone outreach
  
  
• Pipeline reporting and management
  
  

Why We Like It: Leadium brings a people-first, data-backed approach to outbound, making them a reliable partner for startups moving toward Series A/B growth.

7. RevGenius Agency

Best for: Community-driven B2B brands that want brand + outbound alignment.

Built from the RevGenius B2B community, this agency helps brands blend thought leadership, social selling, and cold outreach.

Key Services:

• Social content + outbound mix
  
  
• Thought leadership positioning
  
  
• Community-driven lead generation
  
  

Why We Like It: RevGenius understands modern B2B — they merge brand authority with outbound precision, helping brands sell without sounding “salesy.”

8. Demandhub

Best for: Local and service-based businesses wanting repeatable lead flow.

Demandhub offers a hybrid SaaS + service model that combines outbound automation with review and reputation management.

Key Services:

• Multi-channel lead generation
  
  
• Review requests and follow-ups
  
  
• CRM and pipeline tracking
  
  

Why We Like It: It’s a turnkey solution for local service providers who want done-for-you outreach combined with reputation growth.

9. Growth Rhino

Best for: SaaS and tech companies optimizing cold email campaigns.

Growth Rhino specializes in cold email strategy, testing, and iteration. They help B2B teams increase reply rates and booked meetings through message clarity and experimentation.

Key Services:

• Cold email strategy and A/B testing
  
  
• List building and segmentation
  
  
• Deliverability optimization
  
  

Why We Like It: Growth Rhino’s iterative process and focus on data-driven messaging make them a top choice for teams serious about refining outbound performance.

10. Cleverly

Best for: LinkedIn-focused outbound at scale.

Cleverly’s platform helps businesses automate and personalize LinkedIn outreach at scale while maintaining message authenticity.

Key Services:

• LinkedIn prospecting and messaging
  
  
• Copywriting and campaign management
  
  
• Detailed performance analytics
  
  

Why We Like It: For teams focused on LinkedIn as their primary outbound channel, Cleverly delivers consistent volume and measurable ROI.

What to Look For in an Outbound Marketing Agency

1. Accurate Data and Prospect Targeting

The foundation of every successful outbound campaign is clean, accurate data. Without verified contact information and clearly defined ideal customer profiles (ICPs), even the best messaging will fall flat. Look for agencies that invest in data enrichment, segmentation, and validation before launching any campaign. Reliable data ensures your outreach efforts reach the right people and that your time and budget aren’t wasted chasing irrelevant leads.

2. Personalized Messaging and Positioning

Cold emails and LinkedIn messages only convert when they feel human. A top agency will create unique messaging frameworks tailored to your buyer personas, industry pain points, and product benefits. The best outbound teams avoid templates and focus on relevance, crafting outreach that resonates personally with every prospect.

3. CRM Integration and Tech Stack Alignment

Outbound success depends on operational efficiency. Agencies that integrate directly with your CRM and tech stack help streamline lead tracking, reporting, and follow-ups. This ensures that every qualified lead flows smoothly into your sales pipeline while minimizing manual handoffs and data errors.

4. Multi-Channel Outreach Strategy

Email alone isn’t enough. Today’s best outbound campaigns use a mix of email, phone, LinkedIn, and social touchpoints to increase visibility and response rates. Choose an agency that understands how to orchestrate these channels effectively, knowing when to automate, when to personalize, and when to escalate to a live conversation.

5. Transparent Reporting and Analytics

An effective agency provides regular, detailed performance reporting, not just vanity metrics. Look for partners that share open dashboards, weekly summaries, and insights into what’s working and what’s not. Transparency allows you to make data-driven adjustments that maximize ROI.

6. Scalability and Long-Term Partnership

Your outbound strategy should grow as your business grows. The ideal agency isn’t just a short-term lead vendor; it’s a partner that evolves with your goals. Scalable systems, adaptable teams, and long-term strategic alignment are key traits of agencies that deliver consistent success over time.

Final Thoughts

Outbound marketing isn’t just about sending messages, it’s about starting meaningful conversations at scale. The right agency will understand your target audience, craft authentic outreach, and fill your sales calendar with qualified meetings.

Each of the agencies above brings unique strengths, but all have one thing in common: they help businesses grow through personalized, data-driven outbound campaigns.