Our industry experts ranked the leading BPO companies in California by their specialization, client reviews, average cost and more. Use the handy filter to find your service provider in a matter of clicks.
Organic rankings are determined by five factors: top services, reviews, portfolio, awards/press, and team expertise. Sponsored listings pay for a placement that appears above organic positions. Sponsorship does not affect star ratings or review content - read more on our methodology page.
Founded in 2004 and headquartered in Encino, California, Callbox Inc. is a global leader in outsourced B2B lead generation, appointment setting, and event marketing. With over 20 years of experience and a multilingual team servicing APAC, LATAM, and EMEA, the agency supports medium-sized businesses to...
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Lead Generation Review from Joachim Fong
For the past year, Callbox has provided us with satisfactory lead generating and lead nurturing services. They were instrumental in securing attendees for our events, scheduling client appointments and facilitating the sale of one of our benchtop systems. Their professionalism in conveying our product attributes and valued solutions to prospective customers has brought us results.
Lead Generation Review from Jonathan Anderson
I’ve used Callbox now for about four months for my internet marketing company. The first two months they did not pay off. However with some additional training on my part, they started to close a higher percentage of my target audience. They’re really smart, nice and are really working hard to keep my business. My dedicated team keeps me up-to-date through frequent communications. My R.O.I is getting stronger and my CPA is starting to drop.
Appointment Setting Review from Ted Calvin
Charted Energy has enjoyed a productive relationship with Callbox. They have done a great job of helping us target prospects within the markets we serve as well as qualify leads and set up appointments with decision-makers. Callbox has generally exceeded the number of leads per week we expected and provides a good value by enabling our inside sales team.
Data-Entry-India.com is a global Data & AI operations partner. Serving 3,850+ clients across 50+ countries, we specialize in enterprise data operations, AI training data services, digital commerce data support, data research and intelligence services, and document and content-related support...
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Data Entry Review from Alex M.
Our team was overwhelmed with the large volume of raw data we had to process daily. Data-Entry-India.com stepped in and alleviated this burden by efficiently and quickly processing this data into a structured format. By taking care of data cleaning and validation, their team allowed us to focus on core tasks involving data analysis and decision-making, significantly boosting our productivity.
Data Entry Review from Carlos R.
We needed a reliable service provider who could scrape travel deals data from various websites for our company. We are glad that someone recommended Data-Entry-India.com to us. Their team understood our requirements and provided us with structured and accurate data from specified web sources. Their expertise in handling complex scraping projects has made a significant impact on our operations.
Data Entry Review from James P.
We needed thousands of street photos labeled for our self-driving car project. The team of Data-Entry-India.com provided us with high-quality labeled datasets by annotating over 5000 images on CVAT in half the time we expected. Their work helped us improve the accuracy of our object detection algorithm significantly.
SunTec Data is a global leader in AI-enabled data, BPO, and KPO solutions, backed by over 25 years of experience and 1,500+ data professionals across 50+ countries. Combining advanced AI tools with human-in-the-loop oversight, we deliver ISO-certified, HIPAA-compliant data management...
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BPO Review from Victor Cook
SunTec Data has been our outsourcing partner for the last three years. The team has considerably fueled our growth by providing financial data management and support.
BPO Review from Marc Hill
We were delighted with the results offered by SunTec Data. The team aptly understood our requirements and delivered high-quality data management solutions. Highly recommend them!
BPO Review from Mike Robinson
Great job done by the team! They analyzed our requirements, maintained transparent communication, and delivered tailored contact lists. Would definitely work with them in the future!
ALLSTARSIT is an international outstaffing service provider that helps businesses recruit, pay, insure, and support top global talent with payroll, benefits, and more...
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Staffing Review from Maryna Kalinichenko
Following a requirement to hire three developers to extend one of our teams, ALLSTARSIT stepped in and committed itself from the very start of the process. All our requirements were listened to and met, and their reps guided us expertly throughout the entire process. Moreover, they were able to source multiple candidates with the right skills to fit our project.The verdict, we find ALLSTARSIT extremely effective at what they do, and would certainly recommend this company to others.
DataEntryIndia.in is a leading data management and BPO service provider with over 25 years of experience and 850+ full-time data experts...
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OSP is a healthcare technology company dedicated to transforming the industry through innovative digital solutions. With more than 16 years of experience and a team of skilled healthtech experts, OSP helps healthcare organizations improve performance, efficiency, and patient care through advanced technology...
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David Frank's Review Sourced from Google
I am writing this review to express my utmost satisfaction with the exceptional service provided by OSP Labs . I had the opportunity to work with them on the development of a healthcare digital platform, and their level of professionalism and dedication were simply unparalleled.From the inception of the project, the team demonstrated a comprehensive understanding of our goals and vision. They showed top-tier expertise in healthcare software development, employing innovative strategies to design a platform that was both user-friendly and robust in its functionalities.One of the most impressive aspects of our collaboration was their commitment to consistent communication and support. The team was always readily available to address any queries or issues that surfaced during the development process. This open line of communication went a long way in ensuring that the project progressed smoothly and efficiently.
Influx.com is the #1 on-demand service partner for growing brands. Since 2013, Influx has been trusted by 750+ brands & delivered fully managed, on-brand support, 24/7, on month-to-month plans. Our human + AI teams deliver better customer experience for e-commerce, SaaS, Tech brands worldwide...
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CodeFulcrum is an agile and progressive software company. Specializing in web, mobile and enterprise software development. Delivering products that are both visually stunning and technically ambitious with an unparalleled level of expertise...
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Startupr is an outbound lead generation agency built for B2B startups that need predictable pipeline without hiring an in-house SDR team...
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GoJarvis matches growing businesses with pre-trained virtual assistants who handle operations, sales support, and inbox management — while building custom automations that make your business run faster...
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Wing is a managed assistant service that places dedicated, AI-trained assistants inside growing companies and healthcare practices. Wing handles recruiting, training, and oversight, so clients get coverage they direct without managing performance, replacements, or continuity themselves. Assistants work inside...
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