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Top B2B Lead Generation Experts Worldwide

Since 2004, Callbox has been the trusted leader and top lead generation company, driving high-velocity growth for businesses worldwide. As the largest and most experienced player in B2B sales development, we offer comprehensive solutions from AI-powered prospecting to appointment setting designed to fuel your revenue pipeline.

  • Min project size
    Undisclosed
  • Hourly rate
    Undisclosed
  • Employees
    1,000 - 9,999
  • Locations
    Los Angeles, CA
  • Year founded
    Founded 2004
  • Languages

6 Languages that we service

  • Mandarin
  • English
  • Spanish
  • Portuguese
  • Vietnamese
  • Cantonese

2 Locations

  • Los Angeles , CA
  • Singapore , Singapore

Select Focus Area
Back Office Outsourcing
Customer Service Outsourcing
Outbound Services
Industries
Information technology
20%
Telecommunications
15%
Advertising & marketing
10%
Business services
10%
Financial services
10%
Medical
10%
Education
5%
Hospitality & leisure
5%
Manufacturing
5%
Other industries
5%
Retail
5%
Clients
Enterprise (>$1B)
45%
Midmarket ($10M - $1B)
40%
Small Business (<$10M)
15%
Certified in:
Sales Outsourcing Call Center Services B2B Lead Generation B2B Appointment Setting

Pricing Snapshot

Min. project size Undisclosed
Avg. hourly rate Undisclosed
Rating for cost 4.3 /5

What Clients Have Said

Callbox offers competitive pricing and good value for cost, with clients noting a budget-friendly approach. Specific costs mentioned include $12,000 quarterly and $50,000 annually. Clients appreciate the quality of leads generated and appointment setting, with many experiencing increased sales opportunities.

This summary is based on verified Clutch reviews.

Most Common Project Size

$10,000 - $49,999 based on 101 reviews
< $10,000 $10,000 - $49,999 $50,000 - $199,999 > $200,000

Select a service to see pricing information

Callbox Review Insights

Overall Review Rating

4.6
  • Quality 4.5
  • Schedule 4.7
  • Cost 4.3
  • Willing to Refer 4.6

Top Mentions

Review Highlights

  • Cost-Effective Solutions

    Clients find Callbox's pricing competitive, offering good value for the cost. Their ability to provide comprehensive services at a reasonable price point is a significant advantage for many businesses.

  • Adaptability and Flexibility

    Callbox is noted for their flexibility in adapting to client requirements and market changes. They are proactive in making necessary adjustments to strategies and processes, which has been appreciated by clients seeking tailored solutions.

  • Strong Project Management and Communication

    Clients praise Callbox for their efficient project management and clear communication. Regular meetings, timely updates, and responsiveness to client needs have been highlighted as key strengths, ensuring smooth collaboration and project success.

  • Experienced and Professional Team

    The Callbox team is commended for their professionalism, industry knowledge, and ability to understand client needs. Their experience in lead generation and commitment to quality have been crucial in building successful partnerships.

  • Effective Lead Generation Services

    Callbox consistently delivers high-quality leads, with several clients reporting increased qualified opportunities and closed sales. Their multi-channel approach, including phone, email, and social media, has been effective in reaching target audiences and generating interest.

  • Room for Improvement in Reporting

    While Callbox is generally praised, some clients have suggested improvements in reporting and data analysis. More detailed insights and proactive suggestions could enhance client understanding and decision-making.

Callbox Reviews

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SMM, Content Writing & SEO for Revenue Platform

  • Content Writing Services Search Engine Optimization Social Media Marketing
  • Case Study Writing Content development
  • Confidential
  • Nov. 2025 - Ongoing
5.0
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Callbox's accommodation and openness to feedback are impressive."

Aug 25, 2026
CEO, Revenue Platform
Anonymous
Verified
  • Information technology
  • New York, United States
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provides marketing services for a revenue platform. The team manages social media accounts and creates content, including post copy, blogs, and newsletters, and produces sales and marketing collateral.

Lead Generation for Telecommunications Company

  • Demand Generation Marketing
  • Confidential
  • Jan. 2021 - Ongoing
4.5
Quality
4.5
Schedule
4.5
Cost
4.0
Willing to Refer
3.0

"I'm impressed with Callbox's dedication to quality lead generation and follow-through."

Aug 22, 2026
Manager, The Maynard Group
David Atkinson-Smith
Verified
  • Telecommunications
  • Soquel, California
  • 51-200 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a telecommunications company. The team delivers a list of qualified leads and sets appointments.

Content Marketing & Marketing Strategy for ISO Consultancy

  • Content Marketing Marketing Strategy
  • Confidential
  • Aug. 2026 - Ongoing
4.0
Quality
4.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.0

"We've had a great experience with Callbox so far."

Aug 21, 2026
Head of Sales & Marketing, ISO Consultancy
Anonymous
Verified
  • Business services
  • Stockport, England
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provides marketing strategy and content marketing services for an ISO consultancy. The team is responsible for improving the client's website authority score and generating leads.

Telesales Services for HVAC & Refrigeration Solutions Co

  • Call Center Services Sales Outsourcing
  • B2B Appointment Setting B2B Lead Generation
  • Confidential
  • May 2026 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Callbox utilizes a team approach to spread work among a number of their personnel."

Aug 20, 2026
Owner, Alliance Mechanical Services
Cody Edge
Verified
  • HVAC
  • Euless, Texas
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provides telesales services for an HVAC and refrigeration solutions company. The team contacts potential customers, introduces the client's services, and books discovery meetings with the sales team.

Lead Generation for PropTech Company

  • Sales Outsourcing
  • $10,000 to $49,999
  • Dec. 2024 - Mar. 2025
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

"They are communicative, reliable, and transparent."

Jan 13, 2025
Sales Operations, PropTech Company
Anonymous
Verified
  • Information technology
  • Singapore
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a proptech company. The team is responsible for collecting additional information through the client's existing database.

Sales Outsourcing for Software Company

  • Sales Outsourcing
  • B2B Appointment Setting B2B Lead Generation B2B Lead Qualification
  • $10,000 to $49,999
  • Oct. 2024 - Apr. 2025
3.5
Quality
3.5
Schedule
4.5
Cost
3.0
Willing to Refer
3.5

"They worked collaboratively with us to understand our business."

Jan 9, 2025
Operations Manager, Parker Software Inc
Samantha Rutter
Verified
  • Other industries
  • England
  • 11-50 Employees
  • Online Review
  • Verified

A software company hired Callbox to reach out to their target audience within the US and discuss their products and USPs. This involved arranging meetings for the client's sales consultants.

Lead Generation for Cybersecurity Solutions Provider

  • Call Center Services Sales Outsourcing
  • Confidential
  • Aug. 2021 - Ongoing
4.5
Quality
4.5
Schedule
4.5
Cost
5.0
Willing to Refer
4.0

"Callbox's dedication to providing all-around marketing services and their positive, can-do attitude are impressive."

Dec 31, 2024
Marketing, Cybersecurity Solutions Provider
Anonymous
Verified
  • Information technology
  • San Jose, California
  • 1,001-5,000 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a cybersecurity solutions provider. The team contacts the client's white space ICP, sets up sales appointments, and drives webinar registrations.

Lead Generation Services for IT Solutions Provider

  • Call Center Services
  • $10,000 to $49,999
  • Sep. - Nov. 2024
3.0
Quality
3.0
Schedule
3.0
Cost
3.0
Willing to Refer
3.0

"Callbox's customer engagement services were impressive."

Dec 20, 2024
Marketing, IT Solutions Provider
Anonymous
Verified
  • Other industries
  • Singapore
  • 11-50 Employees
  • Online Review
  • Verified

Callbox was hired by an IT solutions provider for demand generation and lead appointment services. The team is also responsible for customer engagement.

Demand Generation Marketing for IT Consulting & Services Co

  • Branding Demand Generation Marketing Market Research
  • $10,000 to $49,999
  • Oct. 2023 - Aug. 2024
5.0
Quality
5.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.5

"The account manager was competent, and the team in general was good."

Dec 20, 2024
Pre Sales Head, IT Consulting & Services Company
Anonymous
  • Other industries
  • Singapore
  • 11-50 Employees
  • Online Review

Callbox provided demand generation services for an IT consulting firm. The tasks included managing social media campaigns, event and webinar management, and SAP products and services.

Sales Outsourcing for IT Company

  • Sales Outsourcing
  • Confidential
  • Dec. 2024 - Feb. 2025
4.5
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They were friendly and professional."

Dec 19, 2024
Head of Business Development, IT Company
Anonymous
Verified
  • Information technology
  • Singapore
  • 51-200 Employees
  • Online Review
  • Verified

Callbox worked with an IT company to build their sales funnel. They led the client's database curation and enrichment efforts, created lead generation collateral, and handled appointment-setting.

Premier Verified means Clutch independently confirmed Callbox is a legally registered business,
financially sound (Creditsafe: Low Risk), and backed by 120 verified client reviews averaging 4.6 stars.

Learn More
Verified Client Reviews
120
Overall Review Rating
4.6
Source
Clutch
Last Updated
August 29, 2026

Business Entity

Business Entity Name Callbox, Inc.
Source Delaware Secretary of State
Jurisdiction of Formation Delaware
Date of Formation January 13, 2012
Status Active
Last Updated November 16, 2020
ID 5095306

Credit Report Results

International Credit Risk Assessment Low Risk
Source Creditsafe
Last Updated February 2, 2021
Learn More About The Clutch Verification Process

Locations (2)

4924 Balboa Blvd # 353 Los AngelesCA, United States 91316

2 - 5

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