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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, frequently delivering high-quality leads and appointments. Clients appreciate the flexibility and responsiveness of their team, although some mention a desire for more personalized services and improved reporting. Overall, they are seen as a reliable partner for lead generation.

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

  • Challenges with Non-English Speaking Markets

    Some clients have noted challenges in markets where English is not the primary language, suggesting the need for multilingual support to improve engagement in regions like Vietnam and China.

  • Efficient Workflow and Coordination

    The workflow between Callbox and its clients is often described as efficient and well-coordinated, with teams working seamlessly together to achieve project goals.

  • Effective in Building Long-Term Relationships

    Callbox's efforts have not only increased immediate sales opportunities but also fostered long-term relationships with prospects, contributing to sustained business growth for clients.

  • Effective Lead Generation Capabilities

    Callbox has been praised across multiple reviews for its ability to generate qualified leads, often exceeding client expectations in terms of lead volume and quality. Clients in various industries, such as healthcare, IT, and finance, have reported increased sales pipelines and improved conversion rates due to Callbox's lead generation efforts.

  • High-Quality Customer Service

    Callbox is recognized for its excellent customer service, with clients highlighting the team's responsiveness and willingness to address concerns promptly. This has contributed to high levels of client satisfaction and long-term partnerships.

  • Cost-Effective Solutions

    Clients have noted that Callbox offers competitive pricing for its services, providing good value for the cost, especially when compared to hiring in-house teams for similar tasks.

Callbox Reviews

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Call Center Services for Software Development & Ads Agency

  • Call Center Services
  • Inbound appointment scheduling
  • $50,000 to $199,999
  • Dec. 2021 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They’re everything I hoped for, and my team is happy to work with them."

Mar 24, 2022
Founder, ADMEN
Cody Baird
Verified
  • Other industries
  • Austin, Texas
  • 11-50 Employees
  • Phone Interview
  • Verified

A software development and advertising agency hired Callbox to provide call center services. They get the client Google Meet appointments with potential customers to offer their services.

Lead Generation for Web Conferencing SaaS

  • Business Consulting Call Center Services
  • Inbound appointment scheduling
    +1
  • $10,000 to $49,999
  • Aug. 2021 - Ongoing
4.0
Quality
4.5
Schedule
5.0
Cost
4.0
Willing to Refer
4.0

"They conduct themselves professionally, and the quality of their services is constant."

Nov 18, 2021
Enterprise Account Director, KUDO
Aryeh Sternberg
Verified
  • Other industries
  • Sydney, Australia
  • 51-200 Employees
  • Phone Interview
  • Verified

Callbox is a web conferencing SaaS’ lead generation partner. They’ve built pre-lead profiles across multiple countries, and they conduct prospecting through phone calls, emails, and LinkedIn.

Lead Generation Services for SaaS Company

  • $200,000 to $999,999
  • Apr. 2021 - Ongoing
4.5
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Their responsiveness and their ability to get things done are impressive."

Sep 22, 2021
Regional Sales Director, SaaS Company
Anonymous
Verified
  • Other industries
  • Singapore
  • 51-200 Employees
  • Online Review
  • Verified

Callbox is providing lead generation services for a SaaS company. They are in charge of creating a target list of prospects, developing a lead management program, reaching out to prospects, and more.

Lead Generation for Telecommunications Company

  • Digital Strategy Other Digital Marketing
  • Confidential
  • July 2021 - Jan. 2022
4.0
Quality
4.0
Schedule
5.0
Cost
4.0
Willing to Refer
5.0

"They've shown great passion to learn about our business, customers, and processes."

Sep 15, 2021
CMO, ViewQwest Pte Ltd
Anonymous
Verified
  • Telecommunications
  • Singapore
  • 201-500 Employees
  • Online Review
  • Verified

Callbox is tasked with implementing account-based marketing (ABM) campaigns for a telecommunications company. The main objective is to acquire more sales leads.

Call Center Services for Cloud Service Provider

  • Call Center Services
  • $10,000 to $49,999
  • June - Aug. 2021
4.0
Quality
4.0
Schedule
4.0
Cost
2.5
Willing to Refer
4.0

"We're satisfied with their workflow."

Sep 10, 2021
Sales Director, Cloud Service Provider
Anonymous
Verified
  • Other industries
  • Singapore
  • 1-10 Employees
  • Online Review
  • Verified

Callbox's serves as an extended sales team of a cloud service provider. Their main goal is to bring the client's campaign to life, and they conduct calls following the company's script and strategy.

Call Center Services for IT Services Company

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

"They are quick to respond and delivers what we request."

Aug 26, 2021
Regional Marketing Manager, IT Services Company
Elaine Tan
Verified
  • Other industries
  • Singapore
  • 1,001-5,000 Employees
  • Online Review
  • Verified

Callbox handles ongoing call center services for an IT company. The team performs account-based marketing (ABM) and outbound sales outreach efforts with the goal of generating more leads.

Call Center Services for Marketing Tech Company

  • Call Center Services
  • $10,000 to $49,999
  • Mar. - May 2021
3.5
Quality
3.5
Schedule
4.5
Cost
2.5
Willing to Refer
5.0

"We were impressed by their responsiveness and ability to adapt to changes quickly."

Aug 26, 2021
Country Manager, Marketing Tech Company
Winnie Ng
Verified
  • Other industries
  • Hong Kong
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provided call center services for a marketing tech firm. The team conducted calls, scheduled meetings, and assisted in webinar registrations to help the client generate more leads.

Lead Generation for Digital Solutions Provider

  • Other Digital Marketing
  • $10,000 to $49,999
  • Apr. 2021 - Ongoing
4.0
Quality
4.0
Schedule
4.0
Cost
3.5
Willing to Refer
4.0

"I am impressed with their campaign delivery and campaign management experience."

Jul 20, 2021
VP Marketing, PCCW Global
Anonymous
Verified
  • Telecommunications
  • Hong Kong
  • 501-1,000 Employees
  • Online Review
  • Verified

Callbox was hired by a digital solutions provider to handle their lead generation efforts. The team is in charge of scheduling sales appointments with prospects.

Call Center Services for IT Services Firm

  • Call Center Services
  • $10,000 to $49,999
  • Sep. 2020 - May 2021
4.5
Quality
4.5
Schedule
5.0
Cost
4.5
Willing to Refer
4.0

"They were very professional and friendly."

Jul 20, 2021
Sales Manager, AdvantageNZ
Andrew Ramson
Verified
  • Other industries
  • New Zealand
  • 11-50 Employees
  • Online Review
  • Verified

An IT services company was looking to generate more leads for their sales team. They hired Callbox to handle calls and schedule appointments with prospective customers.

Lead Gen for Workplace Safety & Health Organization

  • Other Digital Marketing
  • $10,000 to $49,999
  • Feb. 2021 - Ongoing
4.5
Quality
5.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.5

"Callbox has a clear idea of the process and has guided us well."

Jul 7, 2021
Marketing Manager, WSH Council
Chia Yi Lun
Verified
  • Government
  • Singapore
  • 201-500 Employees
  • Online Review
  • Verified

As part of their efforts to promote their mission, a Workplace Safety and Health (WSH) organization has hired Callbox to gather an audience for one of their programs. The vendor focuses on gathering leads.

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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