Company lists · Data refreshed September 2026
Top 25 Quality assurance companies for contact centers worldwide
RevenueBase identified 761 quality assurance companies for contact centers worldwide as of September 2026 and tracks 23,958 professional contacts across them, including 2,434 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.
This list covers quality assurance companies for contact centers worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 2026. Country and city lists for quality assurance companies for contact centers follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest quality assurance companies for contact centers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,225 contacts → | ||||
Strong evidence “We deliver tailored Contact Center and Back Office solutions to our strategic partners, leveraging advanced technology and high quality standards to elevate customer experiences…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,076 contacts → | ||||
Indirect evidence “Even the markets know that we’re the good call’!” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 686 contacts → | ||||
Indirect evidence “Consultora especializada en servicios de Aseguramiento de la Calidad del Software dirigidos a controlar y mejorar los costes, plazos y calidad del ciclo de vida de los productos…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 478 contacts → | ||||
Strong evidence “Alvaria CX, the global leader in contact center solutions, emerged from the 2021 merger of Noble Systems and Aspect, bringing over 50 years of CX innovation.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 451 contacts → | ||||
Partial evidence “Capita is an award-winning contact centre service company with fully hosted global delivery centres trusted by global leading brands to transform their Customer Experience.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 430 contacts → | ||||
Indirect evidence “Millennium1 Solutions is now NTT Business Process Outsourcing.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 415 contacts → | ||||
Indirect evidence “For 15 years, Astegic has been helping Fortune 500 through startup companies with their Testing & QA needs.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 390 contacts → | ||||
Strong evidence “Soluciones integrales de Contact Center.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 367 contacts → | ||||
Strong evidence “Here’s our ten-second elevator pitch: we provide affordable, onshore and/or nearshore, high-touch customized contact center solutions for brands who care deeply about the quality…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 338 contacts → | ||||
Strong evidence “29 años de experiencia brindando soluciones integrales de contact center que superen las expectativas de nuestros clientes, a través de un equipo altamente capacitado, tecnología…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 337 contacts → | ||||
Strong evidence “Somos uma empresa de contact center que tem como foco a satisfação dos clientes.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 330 contacts → | ||||
Strong evidence “Diseñamos estrategias a medida y nos destacamos por ofrecer calidad, flexibilidad y eficiencia en nuestros servicios de Contact Center.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 329 contacts → | ||||
Strong evidence “Five Star Call Centers is a onshore and nearshore contact center outsourcer where we deliver outrageously amazing customer experiences for our clients and their customers.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 306 contacts → | ||||
Strong evidence “Optima Communications International (OCI) is a Canadian contact center and business process outsourcer (BPO) specializing in regulated and complex industries, including utilities…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 281 contacts → | ||||
Indirect evidence “With today’s informed and interconnected consumers, businesses must go the extra mile to ensure the utmost level of customer service from their employees.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 265 contacts → | ||||
Strong evidence “Somos una empresa con experiencia en el área Centros de Contacto (Contact Center), con experiencia en la gestión general de productos de consumo masivos, corporativos y…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 264 contacts → | ||||
Indirect evidence “ExpertCallers (a division of Flatworld Solutions) is a global consulting and outsourcing company, with a wealth of experience in providing operational and strategic excellence to…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 249 contacts → | ||||
Partial evidence “Quality in An AI Driven World.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 235 contacts → | ||||
Strong evidence “CONTACT CENTER SERVICES INNOVATIVE, HIGH-PERFORMANCE SOLUTIONS THAT WORK Mass Markets executes domestic omni-channel, inbound and outbound contact center services on behalf of…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 214 contacts → | ||||
Indirect evidence “Hansa Direct – a part of Hansa Customer Equity, is a one-of-a-kind Customer Experience Centre backed by specialists across data, analytics, MarTech and digital.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 211 contacts → | ||||
Partial evidence “Pro QC International provides tailored quality solutions with a human touch in 100 countries.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 206 contacts → | ||||
Indirect evidence “Convin is an Omnichannel AI Agent Platform for customer conversations that turns B2C interactions into revenue.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 182 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 174 contacts → | ||||
Strong evidence “One os si presenta sul mercato dei Contact Center focalizzandosi nei settori Insurance, Energy e Utilities.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 171 contacts → | ||||
Strong evidence “Zero Variance by Ubiquity is a leader in Contact Center Solutions, specializing in BPOaaS, AI Technology, CX Services, Business Intelligence, Data Analytics, and QA Professional…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: quality assurance companies for contact centers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names quality assurance companies for contact centers.
- Partial evidence
- Its own public description names part of quality assurance companies for contact centers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name quality assurance companies for contact centers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 761 quality assurance companies for contact centers worldwide
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Quality assurance companies for contact centers worldwide at a glance
As of Sep 29, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among quality assurance companies for contact centers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for quality assurance companies for contact centers are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “quality assurance companies for contact centers”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names quality assurance companies for contact centers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among quality assurance companies for contact centers, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 2,434 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 29, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Quality assurance companies for contact centers by location
4 lists · largest firstEvery Quality assurance companies for contact centers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names quality assurance companies for contact centers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many quality assurance companies for contact centers are there worldwide?
RevenueBase identified 761 quality assurance companies for contact centers worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
American Call Center, headquartered in Guayaquil, tops this list with the largest team on record.
Which country has the most quality assurance companies for contact centers?
The United States leads with 144 companies, followed by Brazil (39) and India (36). Every quality assurance companies for contact centers list by country and city is linked on this page.
Which city has the most quality assurance companies for contact centers?
Sao Paulo leads with 15 headquartered companies, followed by Madrid (7) and Santiago (7).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,434 verified decision-maker contacts tracked across these 761 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.