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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

  • Strong Project Management and Communication

    Clients commend Callbox for its structured approach to project management and clear communication. Weekly updates and open lines of communication have been highlighted as key strengths, ensuring clients are kept informed and involved in the process.

  • 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.

  • 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.

  • Impressive Flexibility and Customization

    Callbox is noted for its flexibility in customizing campaigns to meet specific client needs, allowing for tailored approaches that align with unique business objectives.

  • 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.

  • Successful in Increasing Brand Awareness

    Callbox has successfully helped clients increase brand awareness through targeted outreach and marketing campaigns, contributing to a stronger presence in their respective markets.

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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