Updated September 24, 2026 | 16 min read

12 AI outbound lead generation agencies to work with in 2026

Outbound got harder. Gmail and Yahoo tightened sender rules, inboxes are full of automated sequences, and buyers ignore anything that reads like a template. At the same time, AI changed what a small team can do: research, enrichment and personalization that took an SDR a full day now takes minutes.
That's why more B2B companies hand outbound to an agency. The problem is that most agencies look the same on paper. Everyone promises booked meetings, AI-powered targeting and a "predictable pipeline."
This guide describes 12 outbound lead generation agencies by what they do well, how they use AI, what they cost and which company each one fits. You'll also find a method to pick the right partner and the questions to ask before you sign.

Comparison table

Agency
HQ
Good fit for
Main channels
How they use AI
Starting price
Growth Room
Paris, France
B2B companies wanting outbound, ads and SEO/GEO from one partner
Email, LinkedIn, voice messages, ads
AI prospecting agents
On request
Belkins
Dover, US
Mid-market and enterprise appointment setting
Email, calls, LinkedIn
AI-backed targeting run by human specialists
Around $5,500/month reported by clients
Callbox
Encino, US
International and enterprise programs
Email, calls, LinkedIn, social, ABM
AI-supported prospecting
On request
CIENCE
Denver, US
High-volume multichannel SDR programs
Email, calls, LinkedIn, programmatic ads
graph8 AI platform
Per-meeting pricing, GTM setup from $5,000
Cleverly
Los Angeles, US
Small businesses testing LinkedIn outreach
LinkedIn, email, calls
Data from past campaigns, human-written copy
$397/month
ColdIQ
New York, US
SaaS teams wanting advanced data and automation
Email, LinkedIn, LinkedIn Ads
Clay workflows and AI enrichment
$10k to $25k/month retainer
Frontal
Not disclosed
Teams wanting Clay-native outbound plus ads
Email, LinkedIn, LinkedIn Ads
Open-source AI agent skills for GTM
On request
Leadium
Las Vegas, US
US companies wanting a fully managed outbound engine
Email, LinkedIn, calls
Personality data to personalize outreach
On request
Martal Group
Oakville, Canada
Tech and SaaS companies entering North America
Email, calls, LinkedIn
AI SDR workflows with onshore SDRs
On request
SalesCaptain
London, UK
Startups from seed to Series C
Email, LinkedIn
Clay and AI signal tracking
$4k to $6k/month
SalesHive
Denver, US
US B2B teams wanting calls plus email
Calls, email, LinkedIn
eMod AI email personalization, power dialer
Around $4,000/month
Sopro
UK
UK and EU teams needing GDPR-first outreach
Email, LinkedIn, display ads
Managed digital prospecting
Around $3,800/month

What an outbound lead generation agency does

An outbound lead generation agency finds, contacts and qualifies prospects on your behalf, then hands you booked meetings or sales-ready leads.
In practice, the work covers six jobs:
  1. Defining your ICP and building target account and contact lists
  2. Enriching and verifying data (emails, phone numbers, company signals)
  3. Writing the messaging and sequences
  4. Running outreach across email, LinkedIn and phone
  5. Handling replies and booking meetings
  6. Reporting on what works and adjusting
An agency differs from an in-house SDR team because you rent the people, process and tools instead of hiring and training them. It differs from an AI SDR tool because humans still own strategy, copy judgment and conversations. The software does part of the work, the agency runs the whole machine.

How we selected these agencies

We looked at dozens of agencies and kept 12 that cover different company sizes, markets and ways of working. Each one had to show:
  1. Proof of results. Public case studies with numbers, or a solid volume of client reviews on Clutch, G2 or Trustpilot.
  2. Channel coverage. Email, LinkedIn, phone, and in some cases ads.
  3. Real AI usage. AI built into the workflow (enrichment, research, personalization, reply handling), not only on the homepage.
  4. Transparency. Clear pricing, or at least a clear pricing model, and visible reporting.
  5. A distinct fit. Each agency serves a use case the others don't cover as well.
Growth Room appears first as our featured partner. The other agencies follow in alphabetical order.

12 outbound lead generation agencies to know in 2026

Growth Room

Good fit for: B2B companies that want AI-powered prospecting, paid media and SEO/GEO run by one team.
  • HQ: Paris, France
  • Founded: 2020
  • Team size: 40+ consultants / Only full time experts / No freelancers
  • Channels: cold email, Hubspot CRM, LinkedIn automation, SEO and GEO, SEA, Meta Ads, LinkedIn Ads, and ChatGPT Ads
  • How they use AI: AI prospecting agents inside their outbound offer
  • Pricing: approx. $3500 / mois
  • Notable clients and results: ManoMano, Devialet, Taboola, Le Fooding, lemlist, IonQ, Quantinuum. Public case studies on Sortlist include 37 leads per month for Elinoï, 16 for FideClub, plus a cost per lead 16x lower than the average basket for Consulto.
Growth Room is a growth marketing and AI marketing agency that has worked with 150+ B2B and B2C companies. Most outbound agencies stop at prospecting. Growth Room also runs paid acquisition, SEO and GEO, ABM, HubSpot integration and RevOps, so the same team can connect outbound to the rest of your pipeline.
Each client gets dedicated consultants and a tailor-made, semi-automated prospecting process. For outbound, that means ICP work, list building, multichannel sequences across email and LinkedIn, and automated voice messages to stand out from inbox noise. For companies where outbound and ads target the same accounts, running both through one partner avoids the classic gap between marketing and sales campaigns.
Their GEO work matters too. As buyers ask ChatGPT and Perplexity for vendor recommendations, Growth Room helps clients show up in those answers, a channel most outbound agencies don't touch yet.
Pros
  • One partner for outbound, paid media, SEO and GEO
  • Dedicated consultants and custom processes, not a one-size-fits-all playbook
  • Strong fit for European B2B and startups, with public case studies and high ratings on Sortlist, Semrush's agency directory and La Fabrique du Net
Cons
  • Broader scope than pure outbound shops, which may be more than you need
  • Sized for funded startups and mid-sized businesses, less suited to freelancers and sole traders.

Belkins

Good fit for: Belkins is a good fit for mid-market and enterprise companies that want research-led, high-touch appointment setting.
  • HQ: Dover, Delaware, US, with operations in Kyiv, Ukraine
  • Founded: 2017
  • Channels: cold email, cold and intent-based calling, LinkedIn
  • How they use AI: proprietary AI-backed targeting and outreach systems, operated by human specialists
  • Pricing: clients on Clutch report around $5,500 per month for 10+ meetings, with larger programs higher
  • Notable results: 1M+ appointments booked and 1,000+ clients, from mid-market teams to Fortune 500 companies
Belkins starts with strategy: ICP and segmentation, positioning, messaging and market research come before the first email goes out. They then run appointment setting across email, calls and LinkedIn in 50+ industries. Their positioning is "allbound," combining outbound with signals from inbound activity.
Pros
  • Deep strategy and research phase before campaigns start
  • Large track record across many industries
  • Strong client reviews on responsiveness and adaptability
Cons
  • Some Clutch reviewers mention missed meeting targets and ask for more transparency on goals
  • Budget sits above entry-level agencies

Callbox

Good fit for: Callbox is a good fit for mid-market and enterprise companies running outbound across several countries and languages.
  • HQ: Encino, California, US
  • Founded: 2004
  • Channels: email, calls, LinkedIn, social media, search, ABM, events
  • How they use AI: AI-supported processes combined with human sales development and data intelligence
  • Pricing: on request
  • Notable results: 15,000+ companies served and 20,000+ lead generation programs delivered
Callbox is one of the oldest players on this list. Their programs cover 60+ countries and 15+ languages, which makes them a practical option for companies expanding into several markets at once. Beyond appointment setting, they offer outsourced SDRs, ABM, lead qualification, event marketing and AEO services.
Pros
  • 20+ years of experience and global reach
  • Multilingual campaigns in 15+ languages
  • Wide service range, from ABM to event lead generation
Cons
  • Sized for larger programs, less suited to early-stage startups
  • Some Clutch reviewers ask for more detailed reporting

CIENCE

Good fit for: CIENCE is a good fit for companies that want to outsource top-of-funnel entirely with multichannel SDR teams.
  • HQ: Denver, Colorado, US
  • Founded: 2015
  • Channels: email, phone, LinkedIn, programmatic pre-targeting ads
  • How they use AI: AI-assisted prospecting on the graph8 platform, which includes a 700M+ contact database
  • Pricing: performance-based, per-meeting pricing with month-to-month contracts, and a 5-day GTM system setup for $5,000
  • Notable results: 3,000+ clients across 263+ industries
CIENCE now operates as a division of graph8, a GTM platform company. The model pairs human SDRs with graph8's data and orchestration tools, so data, outreach and reporting run on the same layer. They also offer inbound SDR services for MQL follow-up.
Pros
  • Software and services under one roof
  • Can spin up several SDRs faster than in-house hiring
  • Flexible contract model
Cons
  • Third-party reviews describe layered pricing (SDR salary, onboarding, per-meeting rate, commission) that is hard to forecast
  • Less boutique, less hands-on strategy than smaller agencies

Cleverly

Good fit for: Cleverly is a good fit for small businesses that want to test done-for-you LinkedIn outreach on a small budget.
  • HQ: Los Angeles, California, US
  • Founded: 2017
  • Channels: LinkedIn, cold email, cold calling
  • How they use AI: targeting and messaging informed by data from past campaigns, with human-written copy
  • Pricing: LinkedIn plans at $397, $697 and $997 per month. Cold email runs on a pay-per-meeting-ready-lead model
  • Notable results: 10,000+ clients served
Cleverly is one of the few agencies that publishes its prices. All LinkedIn plans cover the same prospect volume, and higher tiers add email, multiple campaigns and a dedicated appointment setter who manages your inbox. Every client gets a dedicated account manager.
Pros
  • Published, low entry price
  • Done-for-you setup with a dedicated account manager
  • Large volume of client reviews
Cons
  • 90-day minimum commitment on LinkedIn plans
  • Campaigns run from your LinkedIn account, so check how they handle account access and security

ColdIQ

Good fit for: ColdIQ is a good fit for B2B SaaS teams that want advanced data enrichment and automated, signal-based outbound.
  • HQ: New York, US
  • Channels: cold email, LinkedIn outreach, LinkedIn Ads
  • How they use AI: Clay workflows, AI enrichment and trigger-based campaigns
  • Pricing: monthly retainer around $10k to $25k, with a 3-month initial engagement
  • Notable results: $3M pipeline for AirOps, 58 demos in 14 days for Design Pickle
ColdIQ is a Clay Elite Studio partner founded by Michel Lieben and Alex Vacca. They build full outbound systems combining cold email, LinkedIn outreach, LinkedIn Ads and content, with enrichment at scale. The team also runs a popular directory comparing sales tools, which shows in how deep they go on the tech stack.
Pros
  • Deep technical expertise on Clay and data enrichment
  • Combines outbound with LinkedIn Ads for account-based plays
  • Strong public proof for SaaS companies
Cons
  • Higher budget than most agencies on this list
  • Focus on SaaS and tech, less relevant for other industries

Frontal

Good fit for: Frontal is a good fit for teams that want Clay-native outbound combined with LinkedIn Ads and a transparent, engineering-led approach.
  • Channels: cold email, LinkedIn, LinkedIn Ads
  • How they use AI: open-source AI agent skills for cold email, Clay, intent signals and list building
  • Pricing: on request
Frontal takes a GTM engineering approach and shares a lot of its work publicly. On GitHub, they publish free outbound and ads skills for AI agents, operating playbooks for cold outbound, and a bridge that connects Calendly bookings to lemlist and Clay to warm up the buying group before a call.
Pros
  • Transparent, engineering-led methodology
  • Combines outbound with paid LinkedIn
  • Open-source resources you can test before hiring them
Cons
  • Less public information on clients and pricing than larger agencies
  • Suits teams comfortable with a technical, systems-first approach

Leadium

Good fit for: Leadium is a good fit for US companies that want a fully managed outbound engine with research-heavy personalization.
  • HQ: Las Vegas, Nevada, US
  • Founded: 2016
  • Channels: email, LinkedIn, calls
  • How they use AI: personalization based on prospects' behavior and personality insights
  • Pricing: on request
Leadium runs analytical outbound campaigns designed to deliver pipeline at a lower cost than an in-house SDR team. Their approach combines appointment setting with content creation and research, and clients on Clutch highlight their attention to detail on messaging.
Pros
  • Fully managed, from research to booked meetings
  • Personalization grounded in prospect data
  • Positive long-term client reviews
Cons
  • Focused on the US market
  • No public pricing

Martal Group

Good fit for: Martal Group is a good fit for B2B tech and SaaS companies that want onshore SDRs to enter or grow in North America.
  • HQ: Oakville, Canada, with offices in San Francisco and New York
  • Founded: 2009
  • Channels: cold email, cold calling, LinkedIn
  • How they use AI: onshore SDRs paired with AI SDR workflows
  • Pricing: on request. Clients on Clutch report engagements between $5,000 and $60,000
  • Notable results: high ratings on Clutch and G2
Martal works as an extension of your sales team, from early pipeline development to enterprise account-based programs. Their services cover lead generation, appointment setting, sales outsourcing and ABM. Reviewers often mention how fast the team understands complex products.
Pros
  • Long track record in B2B tech
  • Strong at market entry in North America
  • Flexible engagement sizes
Cons
  • English-speaking, North American focus
  • Some clients ask for more detailed, self-serve reporting

SalesCaptain

Good fit for: SalesCaptain is a good fit for startups from seed to Series C that want Clay-powered outbound matched to each account's buying stage.
  • HQ: London, UK
  • Founded: 2021
  • Channels: cold email, LinkedIn social selling, inbound-led outbound
  • How they use AI: Clay workflows, AI enrichment and signal tracking
  • Pricing: around $4k to $6k per month
  • Notable results: calls booked with companies such as Uber, ESPN and Autodesk
Led by Bill Stathopoulos, Clay's chapter lead for London, SalesCaptain segments accounts by buying stage and builds separate campaigns for top, middle and bottom of funnel. They work with YC and Techstars startups as well as Series B and C companies, across the US, UK and Europe.
Pros
  • Funnel-stage approach instead of one generic campaign
  • Strong Clay expertise
  • Pricing accessible for startups
Cons
  • Email-heavy model, less focus on phone
  • Standard engagement structure may need adapting for complex enterprise sales

SalesHive

Good fit for: SalesHive is a good fit for US B2B teams that want dedicated SDRs running cold calls and cold email on month-to-month contracts.
  • HQ: Denver, Colorado, US
  • Founded: 2016
  • Channels: cold calling, cold email, LinkedIn
  • How they use AI: eMod AI engine for email personalization, power dialer, real-time client dashboard
  • Pricing: around $4,000 per month at entry, higher for multi-SDR packages
  • Notable results: 117,000+ meetings booked for 1,500+ clients
SalesHive rents you a dedicated SDR team that works from its own platform. A strategist owns targeting, messaging and weekly optimization. Clients approve all messaging and targets before launch, and the dashboard syncs with your CRM.
Pros
  • Phone outreach is a core strength
  • Month-to-month contracts
  • Proprietary tech stack included
Cons
  • Built for the US market
  • Mixed reviews on lead volume versus expectations, so align on targets upfront

Sopro

Good fit for: Sopro is a good fit for UK and European companies that want managed digital prospecting with GDPR compliance built in.
  • HQ: UK, with a US office in Miami
  • Channels: email, LinkedIn, display ads, gifting
  • How they use AI: data-driven targeting inside a managed digital outreach program
  • Pricing: around $3,800 per month, with no minimum contract
Sopro runs a managed prospect engagement program with a dedicated account manager and a 24/7 client portal. Their GDPR-first approach makes them a natural option for companies prospecting in the UK and EU, where data rules are stricter than in the US.
Pros
  • GDPR-first, strong across UK and EU
  • No minimum contract
  • Multichannel digital outreach including ads and gifting
Cons
  • Phone outreach isn't the focus
  • Less suited to US-only campaigns

How to choose the right outbound agency

The agency matters less than the fit between their model and your situation. Run these checks before signing.
Define your ICP and volume goals first. An agency can't fix a fuzzy target. Know which industries, company sizes and job titles you want, and how many meetings per month you need to hit your pipeline goals.
Ask who owns the domains and the data. Some agencies send from their own infrastructure, others from domains they set up for you. If you stop working together, you want to keep your lists, your sending domains and their reputation.
Ask how they protect deliverability. Warmup, domain rotation, volume caps per inbox and bounce management should be part of the answer. Gmail and Yahoo sender requirements punish careless senders fast.
Ask what AI does in their process, and see it live. "AI-powered" means nothing on its own. Ask them to show a real workflow: how they research an account, what the AI writes, what a human checks.
Clarify the pricing model. Retainer, pay per meeting, pay per lead and SDR rental each carry different risks. Ask about setup fees, minimum commitment and what happens if targets aren't met.
Agree on KPIs and reporting cadence. Reply rate, positive reply rate, meetings booked, show rate and pipeline generated. Weekly reporting is a good baseline.

Agency vs in-house team vs AI SDR tool

Agency
In-house SDR team
Outbound tool run in-house
Monthly cost
$400 to $25k+
Salary, tools and management per SDR
Tool subscription plus your team's time
Time to launch
2 to 4 weeks
2 to 4 months to hire and ramp
Days
Control over messaging
Shared
Full
Full
Scalability
Fast, limited by budget
Slow, limited by hiring
Fast, limited by team bandwidth
Knowledge stays with you
Partly
Yes
Yes
An agency makes sense when you need pipeline fast, want to test a new market, or don't have outbound expertise in-house. Building your own motion makes sense once you've found a repeatable playbook and want to own it.
Many teams do both: an agency runs campaigns while the in-house team learns the playbook. A lot of agencies run their campaigns on multichannel tools like lemlist, which combines email, LinkedIn and calls in one sequence with built-in deliverability features. When you're ready to bring outbound in-house, you can pick up where the agency left off.

FAQ

What does an outbound lead generation agency do?

An outbound lead generation agency builds target lists, writes messaging, runs outreach across email, LinkedIn and phone, handles replies and books meetings for your sales team. Most also report on campaign performance and adjust targeting and copy based on results.

How much does an outbound agency cost?

Prices range from about $400 per month for LinkedIn-only services to $25,000+ per month for fully managed multichannel programs. Most mid-market engagements sit between $4,000 and $10,000 per month. Pricing models include retainers, pay per meeting, pay per lead and SDR rental.

Is an outbound agency better than hiring SDRs?

An agency launches faster and brings a tested process and tech stack, which helps when you need pipeline quickly or want to test a market. An in-house team costs more to build but gives you full control and keeps the knowledge inside your company. Many companies start with an agency, then build in-house.

Which outbound agency fits a startup?

Startups usually need speed, flexibility and a budget that doesn't lock them in. Agencies with month-to-month contracts or startup-focused models, such as SalesCaptain, Cleverly or SalesHive, are worth a look. Growth Room fits startups that also want help on ads and SEO/GEO.

Which outbound agencies work in Europe and France?

Growth Room is based in Paris and works with European B2B companies. Sopro is UK-based with a GDPR-first approach, and SalesCaptain is based in London. For Europe, check that the agency knows local data rules and can write in your prospects' language.

How long before an outbound agency books meetings?

Most agencies need 2 to 4 weeks for onboarding, list building, domain setup and copy. First meetings usually come in the first 4 to 8 weeks, and campaigns reach full speed after 2 to 3 months of testing and optimization.

What is an AI lead generation agency?

An AI lead generation agency uses AI to research accounts, enrich data, personalize messages and sort replies at scale. Today, most outbound agencies use AI in some form. The difference lies in how deep it goes in the workflow and how much humans still check.

What tools do outbound agencies use?

Most agencies combine a data and enrichment layer (Clay, Apollo, Lusha), a sending and sequencing tool (lemlist, Smartlead, Instantly), a CRM (HubSpot, Salesforce) and deliverability tools for warmup and inbox monitoring. Some, like CIENCE and SalesHive, run on proprietary platforms.

Conclusion

The right outbound agency depends on what you need most. Growth Room fits companies that want outbound, paid media and SEO/GEO connected under one team. Belkins, CIENCE, Martal Group and Callbox suit larger programs and enterprise buyers. ColdIQ, Frontal and SalesCaptain bring deep Clay and automation expertise. Cleverly, SalesHive and Sopro offer lighter or more regional entry points.
Whatever you pick, stay close to the process. Ask for the stack, own your domains and data, and track pipeline, not only meetings booked.
And if you'd rather run outbound yourself, try lemlist for free to launch multichannel campaigns with email, LinkedIn and calls in one sequence.
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