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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

  • Proactive Problem Solving and Strategic Recommendations

    Callbox is recognized for their proactive problem-solving skills and strategic recommendations. Clients value their ability to suggest alternative approaches and continuously improve campaign performance.

  • Impressive Lead Qualification and Targeting

    Callbox's lead qualification and targeting capabilities are highly effective, resulting in high conversion rates and valuable sales opportunities for clients. Their precision in identifying and engaging the right prospects is a key strength.

  • 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.

  • Efficient Workflow and Seamless Coordination

    Callbox maintains an efficient workflow and seamless coordination with clients, ensuring projects are executed smoothly and effectively. Their ability to integrate with client systems and processes is a significant advantage.

  • 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.

  • Responsive and Proactive Support

    Clients appreciate Callbox's responsive and proactive support, noting their ability to address issues promptly and maintain open lines of communication. This level of support is crucial for maintaining successful client relationships.

Callbox Reviews

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Demand Generation Marketing for IT Consulting & Services Co

  • Branding Demand Generation Marketing Market Research
  • $10,000 to $49,999
  • Oct. 2023 - Aug. 2024
5.0
Quality
5.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.5

"The account manager was competent, and the team in general was good."

Dec 20, 2024
Pre Sales Head, IT Consulting & Services Company
Anonymous
  • Other industries
  • Singapore
  • 11-50 Employees
  • Online Review

Callbox provided demand generation services for an IT consulting firm. The tasks included managing social media campaigns, event and webinar management, and SAP products and services.

Sales Outsourcing for IT Company

  • Sales Outsourcing
  • Confidential
  • Dec. 2024 - Feb. 2025
4.5
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They were friendly and professional."

Dec 19, 2024
Head of Business Development, IT Company
Anonymous
Verified
  • Information technology
  • Singapore
  • 51-200 Employees
  • Online Review
  • Verified

Callbox worked with an IT company to build their sales funnel. They led the client's database curation and enrichment efforts, created lead generation collateral, and handled appointment-setting.

Lead Generation for IT Company

  • Account-Based Marketing Email Marketing Sales Outsourcing
  • B2B Appointment Setting
    +1
  • $10,000 to $49,999
  • Nov. 2024 - Ongoing
4.5
Quality
5.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.0

"We're impressed with their professionalism, detail-oriented approach, and timely delivery."

Dec 18, 2024
CEO, IT Company
Anonymous
Verified
  • Information technology
  • Australia
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for an IT company. They've reached out to potential prospects based on the client's ICP. The team has also created a pipeline of qualified leads and appointments.

Lead Generation for 3D Visualization Software Company

  • Market Research
  • Confidential
  • June - Dec. 2023
4.0
Quality
4.0
Schedule
4.0
Cost
4.0
Willing to Refer
4.0

"CallBox had a professional workflow and good execution process."

Dec 18, 2024
Business Development Manager, Trimble Solutions (SEA)
Anonymous
Verified
  • Other industries
  • Bangkok, Thailand
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provided lead generation services for a 3D modeling and visualization software company.

SEO, Event Marketing & Sales Outsourcing for MSP

  • Event Marketing Sales Outsourcing Search Engine Optimization
  • $10,000 to $49,999
  • Nov. 2024 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"The results are delivered on activity levels and client meetings."

Dec 17, 2024
VP of Sales, Managed Service Provider
Anonymous
Verified
  • Information technology
  • Newport Beach, California
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provides business development, SEO, and event marketing services for a managed service provider (MSP). The team is responsible for email outreach, cold calling, and website optimization.

Lead Gen & Appointment Setting for Financial Services Firm

  • Demand Generation Marketing Sales Outsourcing
  • $10,000 to $49,999
  • Sep. 2024 - Ongoing
4.5
Quality
5.0
Schedule
4.5
Cost
4.0
Willing to Refer
4.5

"We're impressed with their good reporting and responsive teams."

Dec 17, 2024
Senior Marketing Manager, Financial Services Company
Lucassen Salim
Verified
  • Financial services
  • Singapore
  • 51-200 Employees
  • Online Review
  • Verified

Callbox provides demand generation services for a financial services firm. The team is responsible for finding databases, conducting lead generation campaigns, and setting appointments.

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
    +1
  • 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.

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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