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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 Lead Generation Performance

    Callbox consistently delivers high-quality leads across various industries, exceeding client expectations. Clients report significant increases in qualified leads, contributing to stronger sales pipelines and improved conversion rates. Their multi-channel approach and expertise in targeting specific markets are praised.

  • 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.

  • 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.

  • 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.

  • Successful Appointment Setting

    Callbox excels in setting qualified appointments, facilitating meaningful engagements between clients and prospects. This service has been instrumental in helping clients build strong sales pipelines and achieve higher conversion rates.

  • 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.

Callbox Reviews

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Lead Generation for Marketing Technology Consulting Firm

  • Other IT Consulting and SI
  • $10,000 to $49,999
  • Aug. 2022 - Mar. 2023
4.5
Quality
4.0
Schedule
5.0
Cost
5.0
Willing to Refer
4.5

"They've been very effective."

Oct 4, 2022
COO, Marketing Technology Consulting Firm
Anonymous
Verified
  • Other industries
  • Denver, Colorado
  • 51-200 Employees
  • Online Review
  • Verified

A marketing technology solutions company has collaborated with Callbox for lead generation. The team handles the company's inbound and outbound calls, email campaigns, and social media to increase leads. 

Lead Generation for Operational Management Platform

  • Content Marketing
  • Confidential
  • Jan. 2021 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They have constantly worked hard to refine and optimize our engagement."

Sep 13, 2022
Senior Business Development Executive, OpsVeda, Inc
Perry Rowdy
Verified
  • Other industries
  • Greensboro, North Carolina
  • 11-50 Employees
  • Online Review
  • Verified

Callbox is the lead generation partner for an operational management platform. They provide outreach services to potential clients and utilize multiple communication channels to generate leads.

Lead Generation for Software Development Company

  • Call Center Services
  • $10,000 to $49,999
  • Aug. 2022 - Ongoing
5.0
Quality
5.0
Schedule
4.5
Cost
5.0
Willing to Refer
5.0

"Callbox provides support from scratch, and they ensure they support your project each step of the way."

Sep 12, 2022
Head of International Business, Software Development Company
Edmundo Castro Molestina
Verified
  • Other industries
  • Hollywood, Florida
  • 11-50 Employees
  • Online Review
  • Verified

Callbox supports a software development company's lead generation initiatives by implementing outbound approaches. They manage marketing through different channels such as phone calls, emails, and social media.

Lead Generation Services for Decision Intelligence Firm

  • Call Center Services
  • $10,000 to $49,999
  • June 2022 - Ongoing
5.0
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
4.5

"Their professionalism and ability to speak English perfectly is impressive."

Aug 29, 2022
Managing Partner, Decision Intelligence Firm
Anonymous
Verified
  • Other industries
  • Raleigh, North Carolina
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a decision intelligence firm. They've provided a curated list of prospects based on the client's ICP and then conducted outreach efforts across multiple channels.

Appointment Setting for B2B Services Company

  • Call Center Services
  • $10,000 to $49,999
  • Mar. - Dec. 2021
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

"They were wonderful to work with, and we communicated regularly."

Jun 8, 2022
Sales & Marketing Manager, B2B Services Company
Bill Pace
Verified
  • Financial services
  • Towson, Maryland
  • 11-50 Employees
  • Online Review
  • Verified

Callbox was a B2B services company’s appointment setter. Their team conducted cold calls to small- and medium-sized businesses and used HubSpot to log information. 

Lead Generation for Dental Care Company

  • Other Digital Marketing
  • Confidential
  • Feb. 2021 - Ongoing
5.0
Quality
5.0
Schedule
4.5
Cost
4.5
Willing to Refer
5.0

"Their workflow is very effecitve, and they deliver on time."

May 3, 2022
VP of Sales & Marketing, Keating Dental Lab
Nick Azar
Verified
  • Other industries
  • Irvine, California
  • 51-200 Employees
  • Online Review
  • Verified

Callbox has been hired by a dental lab for their lead generation services. Their main task involves cold calling and setting appointments with prospective customers. The goal is to acquire 3–4 customers weekly.

Lead Generation & Digital Marketing for Business Consultancy

  • Advertising Content Marketing Direct Marketing Marketing Strategy Other Digital Marketing
  • $50,000 to $199,999
  • Jan. 2007 - Ongoing
4.0
Quality
4.0
Schedule
4.0
Cost
3.0
Willing to Refer
5.0

"They’re very responsive from a project management perspective."

Apr 20, 2022
Principal, Alliance Cost Containment
Eileen Flarity
Verified
  • Other industries
  • Louisville, Kentucky
  • 11-50 Employees
  • Phone Interview
  • Verified

A business consultancy was looking to extend their reach and garner appointments with prospective clients, so they engaged with Callbox for their lead generation and digital marketing services.

Lead Generation for Telecommunications Company

  • Call Center Services
  • $10,000 to $49,999
  • Jan. 2021 - Jan. 2022
0.5
Quality
0.5
Schedule
0.5
Cost
0.5
Willing to Refer
0.5

"We spent a ton of money and got next to nothing."

Apr 20, 2022
Director of Sales, Metropark Communications
Megan Bruns
Verified
  • Telecommunications
  • Earth City, Missouri
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provided lead generation and appointment setting services for a telecommunications company. They implemented outreach campaigns over the phone and through LinkedIn and social media. 

Lead Generation for Technology Company

  • Advertising Direct Marketing
  • $10,000 to $49,999
  • Apr. 2022 - Ongoing
4.5
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
4.0

"If you’re a small company and need to build your sales team or marketing department, then they’re a great team." 

Apr 7, 2022
BPO Sales & Marketing
Merv Charles
Verified
  • Other industries
  • Phone Interview
  • Verified

Callbox provides lead generation services in the form of cold-calling and email marketing. They also schedule appointments and collaborate on scripts. 

Lead Generation for Structural Repair Solutions Company

  • Call Center Services
  • $10,000 to $49,999
  • Feb. 2022 - Ongoing
5.0
Quality
5.0
Schedule
4.5
Cost
5.0
Willing to Refer
5.0

"They are very professional, quick to respond, and on-point."

Apr 1, 2022
Assistant Marketing Manager, Rhino Carbon Fiber
Paul Trzcinko
Verified
  • Other industries
  • Mississauga, Ontario
  • 51-200 Employees
  • Online Review
  • Verified

Callbox provides call center services for a structural repair solutions company. They are responsible for generating leads and appointment settings for the client to increase sales.

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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