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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 with good value for cost, as highlighted by clients across various industries. Many noted a positive ROI and effective lead generation, with costs structured to accommodate project needs. Specific project costs weren't detailed, but clients appreciated the flexibility and results delivered.

This summary is based on verified Clutch reviews.

Most Common Project Size

$10,000 - $49,999 based on 100 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 4.6
  • Cost 4.3
  • Willing to Refer 4.6

Top Mentions

Review Highlights

  • Successful Lead Generation and Lead Quality

    Callbox consistently delivers high-quality leads, contributing to increased sales pipelines and conversion rates for various clients. Their efforts have resulted in impressive lead generation and appointment setting, with many reviews highlighting the positive impact on business growth and client satisfaction.

  • Positive Client Relationships

    Clients value the strong relationships they build with Callbox, noting the team's professionalism, dedication, and commitment to client success. The collaborative nature of their partnerships fosters trust and long-term engagement.

  • Challenges with Non-English Markets

    Some clients have noted challenges in non-English speaking markets, suggesting improvements in language capabilities could enhance Callbox's effectiveness in these regions. Tailoring strategies for diverse geographic areas could lead to better outcomes.

  • Effective Communication and Responsiveness

    Clients appreciate Callbox's effective communication and responsiveness. The team is noted for their quick responses, proactive communication, and ability to address client needs promptly. Regular updates and clear communication channels contribute to a positive client experience.

  • Strong Project Management Skills

    Callbox demonstrates strong project management skills, ensuring timely delivery and efficient workflow. Clients commend their structured approach, attention to detail, and ability to manage complex campaigns effectively. Weekly updates and collaborative efforts enhance project success.

  • Comprehensive Service Offerings

    Callbox offers a wide range of services, including lead generation, appointment setting, and multi-channel marketing. Their comprehensive approach, which includes telemarketing, email, social media, and more, provides clients with a robust solution to meet their marketing and sales goals.

Callbox Reviews

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Lead Generation for 3D Printing Co

  • Demand Generation Marketing Sales Outsourcing
  • B2B Appointment Setting B2B Lead Generation B2B Lead Qualification
  • $50,000 to $199,999
  • Jan. 2024 - Apr. 2025
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They were able to find the right persona, which was very difficult for us."

Feb 6, 2025
Head of Marketing, BASF 3D Pinritng Solutions
Alexander Levit
Verified
  • Other industries
  • Heidelberg, Germany
  • 201-500 Employees
  • Online Review
  • Verified

Callbox has generated leads for a 3D printing company. The team has been tasked with expanding the client's business in the American market.

Lead Generation for IT Services Company

  • Email Marketing Market Research
  • Confidential
  • Apr. 2024 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
4.0

"They're very prompt in responding to emails."

Jan 9, 2025
Sales Operations Specialist, IT Services Company
Anonymous
Verified
  • Other industries
  • Singapore
  • 51-200 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for an IT services company. Their work focuses on reaching out to contacts and providing qualified leads based on targeted industries and countries.

Sales Outsourcing for Software Company

  • Sales Outsourcing
  • B2B Appointment Setting B2B Lead Generation B2B Lead Qualification
  • Confidential
  • Jan. 2023 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They over-deliver and meet every area of our goals."

Jan 7, 2025
Marketing Manager APAC+Japan, Quadient
Andrew Inkpen
Verified
  • Information technology
  • France
  • 1,001-5,000 Employees
  • Online Review
  • Verified

Callbox provides comprehensive SDR services for a software company. The team is responsible for lead generation and nurturing efforts, including identifying, engaging, and qualifying prospects.

Account-Based Marketing & Lead Gen for Diagnostics Co

  • Account-Based Marketing Call Center Services Demand Generation Marketing
  • Less than $10,000
  • Sep. 2024 - Ongoing
4.5
Quality
4.5
Schedule
4.0
Cost
3.5
Willing to Refer
4.5

"Callbox is an organization that is professionally managed and process-oriented."

Dec 23, 2024
Senior Regional Marketing Manager (APAC), Cepheid
Varun Suneja
Verified
  • Other industries
  • Singapore
  • 1,001-5,000 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a diagnostics company. The team has identified, qualified, and engaged leads for the client, refined the client's ICPs and targeting strategies, and created lead briefs.

Lead Gen & Appointment-Setting for Security Solutions Co

  • Back Office Outsourcing Business Valuation Services Call Center Services
  • Claims Processing Data Entry & Processing Writing & Content Creation Outsourcing
  • Confidential
  • Jan. 2023 - Dec. 2024
4.5
Quality
5.0
Schedule
4.5
Cost
5.0
Willing to Refer
5.0

"Callbox is trusted by top global companies to improve sales cycles, generate high-value leads, and support market growth."

Dec 19, 2024
Head of Business Dev Asia Pacific, Cochrane Global
Jaco Marais
Verified
  • Manufacturing
  • Tokyo, Japan
  • 5,001-10,000 Employees
  • Online Review
  • Verified

Callbox provided lead generation, sales support, and appointment-setting services for a security solutions company. The goal was to increase the client's sales pipeline and B2B and B2C connections.

Call Center Services for Healthcare Company

  • Call Center Services
  • $10,000 to $49,999
  • Oct. 2024 - Feb. 2025
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Callbox was very responsive and flexible in their approach."

Dec 19, 2024
Executive, Hello Health Group
Anonymous
Verified
  • Other industries
  • Vietnam
  • 201-500 Employees
  • Online Review
  • Verified

Callbox provided call center services for a healthcare company. The goal was to generate outreach via multi-channels using the client's existing database for core and non-core audiences.

Lead Generation Services for Logistics Company

  • Email Marketing Sales Outsourcing Social Media Marketing
  • B2B Appointment Setting B2B Lead Generation B2B Lead Qualification LinkedIn Advertising
  • $10,000 to $49,999
  • Nov. 2024 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.0
Willing to Refer
5.0

"They're a great partner to work with."

Dec 17, 2024
Business Development Manager, Logistics Company
Anonymous
Verified
  • Supply Chain, Logistics, and Transport
  • Singapore
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a logistics company. Their tasks include email and call outreach, appointment setting, lead qualification, and LinkedIn management.

Lead Generation & Webinar Mgmt for IT Services Co

  • Sales Outsourcing
  • Confidential
  • Jan. 2020 - June 2023
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Callbox exhibited proactive problem-solving skills."

May 30, 2023
Sales Manager, Yularatech
Shahana Rasheed
Verified
  • Other industries
  • Australia
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provides lead generation services to an IT services company. The team generates leads, schedules appointments with key stakeholders and decision-makers, and organizes and manages webinars.

Demand Generation Services for SaaS Company

  • Other Digital Marketing
  • $10,000 to $49,999
  • Aug. 2022 - Ongoing
5.0
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Callbox is an experienced demand generation company."

Oct 19, 2022
CMO, AutoPylot Technologies
Steve Shaw
Verified
  • Other industries
  • Sonoma, California
  • 1-10 Employees
  • Online Review
  • Verified

A SaaS provider has engaged with Callbox for demand generation. They create a list of target accounts, a landing page, email and message copy, a calling script, and a multi-channel demand generation program.

Clutch verification provides an additional layer of data to help you make the right purchasing decision of business services.

Learn More
Verified Client Reviews
112
Overall Review Rating
4.6
Source
Clutch
Last Updated
March 4, 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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