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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.

  • Effective Appointment Setting

    Callbox excels in setting up appointments with potential clients, significantly aiding businesses in filling their sales pipelines. This service is often highlighted as a key strength by clients.

  • Positive ROI and Business Growth

    Several clients report positive ROI and business growth attributed to Callbox's efforts. The effective lead nurturing and appointment setting have directly contributed to increased sales and expanded client bases.

  • Effective Multi-Channel Approach

    Clients value Callbox's multi-channel marketing approach, which includes telemarketing, social media, and digital advertising. This strategy effectively broadens outreach and enhances engagement with target audiences.

  • Positive Client Relationships

    Callbox maintains strong client relationships through regular communication, responsiveness, and a commitment to client success. This fosters trust and long-term partnerships with their clients.

  • Responsive and Professional Team

    Callbox is praised for its responsive and professional team. Clients often highlight their prompt communication, adaptability to feedback, and commitment to achieving project goals, resulting in smooth collaborations.

Callbox Reviews

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Lead Generation for Cybersecurity Company

  • Demand Generation Marketing Media Planning & Buying Other Digital Marketing
  • Confidential
  • Jan. - Dec. 2024
4.5
Quality
4.5
Schedule
4.5
Cost
4.5
Willing to Refer
4.5

"Callbox's professionalism, efficiency, and commitment to results truly set them apart."

Dec 17, 2024
Digital Marketing Manager, Cybersecurity Company
Anonymous
Verified
  • Information technology
  • Singapore
  • 10,001+ Employees
  • Online Review
  • Verified

Callbox provided lead generation services for a cybersecurity company. The team delivered BANT leads and drove RSVPs for the client's webinars and events.

Lead Generation for Venture Capital Firm

  • Sales Outsourcing
  • B2B Appointment Setting B2B Lead Generation
  • Confidential
  • Nov. 2024 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

"They have a very friendly and approachable staff."

Dec 16, 2024
Portfolio Manager & Advisory, 5I Ventures
Kevin Chang
Verified
  • Business services
  • Singapore
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a venture capital firm. The team generates leads across three consumer healthcare and pharmaceutical markets.

Demand Generation Services for Healthcare Company

  • Conversion Optimization Demand Generation Marketing Email Marketing
  • $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 open to feedback and suggestions on how to improve the process further to get the best possible ROI."

Dec 16, 2024
Product Manager, Healthcare Company
Alan Osbucan
  • Other industries
  • Taguig, Philippines
  • 501-1,000 Employees
  • Online Review

Callbox provides demand generation services for a healthcare firm. They conduct 800 weekly outreach activities, set appointments, create email and social media content, build landing pages, and set up HubSpot.

Lead Generation for Global Trade & Service Provider

  • Call Center Services Other Digital Marketing
  • Confidential
  • Sep. - Nov. 2022
4.5
Quality
5.0
Schedule
4.5
Cost
4.5
Willing to Refer
4.5

"We were impressed by their long-time experience and willingness to bring value to both sides."

Nov 7, 2022
Commercial Manager, Arian Holding
Hosein Hashemian
Verified
  • Other industries
  • Iraq
  • 51-200 Employees
  • Online Review
  • Verified

Callbox spearheaded a global trade and service provider's lead generation efforts to get active leads from Europe and USA. They leveraged the integrated marketing plan to target potential clients.

Digital Marketing for Business Management Firm

  • Advertising
  • $10,000 to $49,999
  • Jan. 2021 - Nov. 2022
5.0
Quality
4.5
Schedule
5.0
Cost
3.0
Willing to Refer
5.0

"The outcome was satisfactory as they met most of our targets."

Oct 25, 2022
CEO, Business Management Firm
Anonymous
  • Other industries
  • Montreal, Quebec
  • 11-50 Employees
  • Online Review

Callbox provided digital marketing for a business management firm. They targeted end customers using emails, managed social media accounts, and launched an outbound filing campaign.

Lead Generation for Consulting Firm

  • Social Media Marketing
  • $50,000 to $199,999
  • Nov. 2021 - Jan. 2022
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They were very professional."

Oct 17, 2022
CBO, Practus Advisors
Graham Kitching
Verified
  • Other industries
  • Tampa, Florida
  • 201-500 Employees
  • Online Review
  • Verified

Callbox was hired by a consulting firm for their lead generation. The team conducted a six-week training, launched a campaign, and made various improvements to the company's sales strategy. 

Lead Generation for B2B Managed IT Services Provider

  • Call Center Services
  • $10,000 to $49,999
  • September 2022
4.0
Quality
5.0
Schedule
5.0
Cost
3.0
Willing to Refer
3.0

"The most impressive about Callbox was the response time was very quick."

Oct 3, 2022
Business Dev Manager, B2B Managed IT Services Provider
Matthew Franzyshen
Verified
  • Other industries
  • Somerset, New Jersey
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provided lead generation services for a B2B managed IT services provider. The team proposed a package that included appointment setting via LinkedIn, sales prospecting, email outreach, and cold calling.

Lead Generation for Cloud Software Organization

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

"Callbox generated a number of leads in a short amount of time and helped our pipeline grow steadily."

Jul 21, 2022
Head of Sales, Cloud Software Organization
Anonymous
Verified
  • Other industries
  • Sydney, Australia
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provides lead generation for a cloud software organization's using voice, email, and social media. Their team was involved in all aspects of the campaign, from email and feedback. 

Lead Generation for IT-Managed Services Provider

  • Content Marketing Other Digital Marketing
  • $10,000 to $49,999
  • Apr. - July 2021
3.0
Quality
3.0
Schedule
3.5
Cost
3.0
Willing to Refer
3.0

"Their marketing plan could be reassessed in order to obtain some results for their clients."

Jun 13, 2022
Director of Sales Operations, IT Managed Services Provider
Anonymous
Verified
  • Other industries
  • Manhattan, New York
  • 51-200 Employees
  • Online Review
  • Verified

Callbox was tasked to generate leads for an IT-managed services provider. The services included creating content, call scripts, email copies, landing pages, and social media messaging.

Digital Marketing for Software Dev Company

  • Digital Strategy Other Digital Marketing Social Media Marketing
  • Less than $10,000
  • Jan. 2022 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

"CallBox is experienced and knowledgeable in the IT service management industry."

May 20, 2022
Sales & Marketing VP, Software Development Company
Anonymous
Verified
  • Other industries
  • Sunnyvale, California
  • 51-200 Employees
  • Online Review
  • Verified

Callbox has created and implemented a digital marketing campaign — including email and social media marketing — to promote their new product, achieve better results, and save costs.

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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