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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 is perceived as offering good value for cost, with clients noting effectiveness in lead generation and appointment setting. Specific investments vary, with some clients spending between $12,000 and $80,000 annually, depending on project scope and engagement length.

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

  • Challenges with Non-English Markets

    Some clients noted challenges in non-English speaking markets, suggesting improvements in language capabilities could enhance effectiveness in regions like China and Vietnam, where local language proficiency is crucial.

  • Project Management and Communication

    Callbox's project management skills are frequently commended. Clients value their structured processes, regular updates, and the ability to maintain clear communication channels, ensuring project alignment and timely delivery.

  • Industry-Specific Expertise

    Callbox is noted for its ability to understand and adapt to various industries, providing tailored solutions that align with specific business objectives. This expertise helps them deliver relevant and impactful results.

  • Effective Lead Generation Services

    Callbox consistently delivers high-quality leads that meet client expectations. Many clients have reported increased lead volume and improved conversion rates, indicating effective lead generation strategies tailored to diverse industries.

  • Adaptability and Flexibility

    Clients appreciate Callbox's flexibility in adapting strategies and processes to align with client-specific needs and market conditions. This adaptability enhances the effectiveness and relevance of their services.

  • Cost-Effective Solutions

    Clients appreciate Callbox's cost-effective solutions, which provide significant value and ROI. Their pricing is often seen as competitive, making their services accessible to a broad range of businesses.

Callbox Reviews

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Sales Outsourcing Services for IT Company

  • Sales Outsourcing
  • B2B Appointment Setting B2B Lead Generation
  • Confidential
  • Apr. 2026 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

"They listen to us and are very good with potential clients."

Aug 21, 2026
CEO, DataHub Innovations
Mit Patel
Verified
  • Information technology
  • Los Angeles, California
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provides ongoing sales support for an IT company. The team creates lists for cold outreach, creates appropriate messages, and follows through with targets until they book a conversation or meeting.

Content Marketing Services for FinTech Company

  • Content Marketing Sales Outsourcing
  • B2B Lead Generation B2B Lead Qualification
  • $10,000 to $49,999
  • June 2026 - Ongoing
5.0
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"The Callbox team has been excellent."

Aug 20, 2026
Manager, Virtual Events, FinTech Company
Anonymous
Verified
  • Financial services
  • New York City, New York
  • 1,001-5,000 Employees
  • Online Review
  • Verified

Callbox provides webinar promotion services for a fintech company. The team is responsible for signing up prospects for the client's webinars.

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.

Premier Verified means Clutch independently confirmed Callbox is a legally registered business,
financially sound (Creditsafe: Low Risk), and backed by 116 verified client reviews averaging 4.6 stars.

Learn More
Verified Client Reviews
116
Overall Review Rating
4.6
Source
Clutch
Last Updated
August 22, 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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