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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%

Pricing Snapshot

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

What Clients Have Said

Callbox offers competitive pricing for lead generation services, with clients reporting positive ROI and significant lead generation outcomes. Specific costs were not disclosed, but clients appreciate the value for cost and flexibility offered. Their services include multi-channel outreach, which enhances effectiveness.

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

  • Effective Use of Multi-Channel Strategies

    Callbox effectively utilizes multi-channel strategies, including email, phone, and social media, to engage prospects and generate leads. This approach has been successful in reaching diverse markets and enhancing client outreach efforts.

  • Adaptability to Client Needs and Market Changes

    Callbox demonstrates strong adaptability to client needs and market changes, quickly adjusting strategies to align with evolving objectives. This flexibility is a significant factor in their ability to maintain long-term client relationships.

  • Challenges with Non-English Markets

    Some clients noted that Callbox could improve its services in non-English speaking markets by hiring multilingual agents. This would enhance their ability to engage effectively with prospects in regions like China and Vietnam, where language barriers exist.

  • Efficient Workflow and Seamless Coordination

    Callbox maintains an efficient workflow and seamless coordination with clients, ensuring projects are executed smoothly and effectively. Their ability to integrate with client systems and processes is a significant advantage.

  • High-Quality Customer Service

    Clients commend Callbox for their exceptional customer service, highlighting their ability to understand client needs, provide valuable insights, and maintain a positive, can-do attitude. Their dedication to client satisfaction is evident in their proactive communication and support.

  • Impressive Lead Qualification and Targeting

    Callbox's lead qualification and targeting capabilities are highly effective, resulting in high conversion rates and valuable sales opportunities for clients. Their precision in identifying and engaging the right prospects is a key strength.

Callbox Reviews

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Lead Generation for 3D Printing Co

  • Demand Generation Marketing Sales Outsourcing
  • B2B Appointment Setting
    +2
  • $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
    +2
  • 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
    +2
  • 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
    +3
  • $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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