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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

  • Positive ROI and Business Impact

    Clients report positive ROI and significant business impact from Callbox's lead generation efforts. The team's ability to deliver measurable results, such as increased sales opportunities and improved brand awareness, is consistently recognized.

  • Professionalism and Commitment to Excellence

    Callbox is lauded for their professionalism and commitment to excellence. Their teams are described as dedicated, knowledgeable, and efficient, consistently delivering high-quality service and achieving client goals.

  • Strong Project Management and Communication

    Clients appreciate Callbox's structured project management and clear communication. Regular updates via emails, virtual meetings, and detailed reports ensure alignment with client objectives. The team is responsive and adapts quickly to changes, fostering productive collaborations.

  • Successful Engagement in Complex Industries

    Callbox has successfully engaged in complex industries such as cybersecurity and healthcare, delivering valuable leads and insights. Their ability to navigate industry-specific challenges and deliver results is highly regarded by clients.

  • 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.

  • 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.

Callbox Reviews

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Marketing & Telemarketing for Healthcare Software Company

  • Advertising Call Center Services
  • $50,000 to $199,999
  • Jan. 2020 - Ongoing
4.5
Quality
4.0
Schedule
5.0
Cost
4.0
Willing to Refer
5.0

"The workflow between our two companies was fantastic."

Feb 5, 2021
Director of Sales, VOW
Dan Wehrle
Verified
  • Other industries
  • Pittsburgh, Pennsylvania
  • 51-200 Employees
  • Online Review
  • Verified

Callbox provides marketing and telemarketing services for a healthcare software company. The team works to promote the client's services via a website as well as through telemarketing campaigns.

Lead Generation for Custom & Strategic Software Dev Firm

  • Market Research
  • $10,000 to $49,999
  • Sep. 2020 - Ongoing
4.5
Quality
4.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

“They’re dedicated to learning about our business and have worked hard to educate themselves.”

Feb 4, 2021
Client & Strategy Development, LUX interactive, LLC
Brianne Ray
Verified
  • Other industries
  • Troy, Michigan
  • 11-50 Employees
  • Phone Interview
  • Verified

Callbox calls potential buyers, messages them on LinkedIn, and sends email marketing campaigns to a target audience. Then they qualify leads, schedule appointments, and provide a summary report.

Outreach for Telehealth & Telemedicine Payment Platform

  • Advertising Pay Per Click Social Media Marketing
  • Confidential
  • Oct. 2020 - Ongoing
4.5
Quality
5.0
Schedule
4.0
Cost
5.0
Willing to Refer
5.0

“Once their team understood our business, they increased the number of appointments booked by 400%.”

Feb 4, 2021
Owner, Capital Bankcard Option
Dan Clark
Verified
  • Financial services
  • Newport Beach, California
  • 1-10 Employees
  • Phone Interview
  • Verified

Callbox generates leads for their clients by conducting outreach, qualifying potential buyers, and setting up appointments. They also support PPC and social media marketing efforts.

Sales BPO for Medical Supply Seller

  • $10,000 to $49,999
  • June 2017 - June 2018
4.5
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
4.5

"Callbox has a desire to satisfy their customers’ needs."

Feb 2, 2021
Former VP of Sales, Pulsecheck
Carl Schneider
Verified
  • Other industries
  • Brentwood, Tennessee
  • 11-50 Employees
  • Phone Interview
  • Verified

Callbox provided call services to an emergency department software company. The team reached out to specified names using a prepared script in order to secure new accounts.

Marketing & Lead Gen Strategies for Business Consulting Firm

  • Business Consulting Call Center Services
  • $10,000 to $49,999
  • Oct. 2020 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
3.0
Willing to Refer
5.0

"Their quality assurance team is dedicated to meeting our qualified lead generation goals."

Feb 1, 2021
Owner, Strategy Leaders
Andi Gray
Verified
  • Other industries
  • Norwalk, Connecticut
  • 1-10 Employees
  • Phone Interview
  • Verified

Callbox developed a lead generation strategy that the team executes. They collect lead information and then call prospects to spur leads. They manage Google Ads and LinkedIn accounts as well as a chatbot.

Outbound Voice Services for Bank Security Company

  • Call Center Services
  • Confidential
  • Sep. 2018 - Ongoing
4.0
Quality
4.0
Schedule
4.5
Cost
4.0
Willing to Refer
4.5

"Overall, we’re pleased with the results gleaned from their efforts."

Apr 18, 2019
Director of Marketing, Bank Security Company
Anonymous
Verified
  • Financial services
  • Connecticut, United States
  • 201-500 Employees
  • Phone Interview
  • Verified

Callbox provides outbound voice services for a bank security company. They are responsible for developing scripts, contacting existing and potential clients, and responding to customer challenges.

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
    +2
  • $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.

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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