The Online Language Certification Market in 2026: Who Wins

The online language certification market reached a valuation of $4.8 billion in 2025, according to a March 2026 report by Research and Markets, but the real battle is not about revenue—it is about institutional recognition. Cambridge English, Duolingo English Test, and TOEFL iBT have emerged as the three dominant players, each claiming to offer the most valid, accessible, and affordable proof of language proficiency. Universities in Europe, North America, and Asia are now forced to decide which tests they will accept for admissions, creating a fragmented landscape that leaves students uncertain about where to invest their time and money.

This fragmentation matters because language certification is no longer a niche requirement for international students. Remote work, cross-border hiring, and global university partnerships have turned English proficiency credentials into a baseline expectation for millions of professionals and learners. The platform that wins institutional trust will define the standard for the next decade.

Context: How the Market Split

The dominance of in-person testing centers began eroding in 2020, when COVID-19 lockdowns forced education technology companies to scale remote proctoring infrastructure overnight. Cambridge English and ETS (the organization behind TOEFL) had offered computer-based exams for years, but the shift to at-home testing was sudden and irreversible.

Duolingo, previously known for its free language-learning app, launched the Duolingo English Test in 2016 but gained serious market share only after 2020. The test costs $59, takes one hour, and delivers results within 48 hours. By contrast, TOEFL iBT costs between $180 and $300 depending on location, lasts nearly four hours, and requires scheduling weeks in advance. Cambridge English exams range from $150 to $230 and involve separate speaking sessions with human examiners.

The price and convenience gap created an opening. According to Duolingo’s February 2026 transparency report, the platform processed 2.1 million test sessions in 2025, up from 1.3 million in 2023. That growth came largely from markets where traditional testing infrastructure is sparse—India, Nigeria, Brazil, and Southeast Asia.

Yet acceptance by universities has not kept pace with volume. A January 2026 survey by the American Council on Education found that only 38% of US universities accept Duolingo English Test scores for undergraduate admissions, compared to 94% for TOEFL iBT and 87% for Cambridge English exams. The gap is even wider for graduate programs, where Duolingo acceptance sits at 29%.

The Institutional Recognition Problem

Universities base acceptance decisions on perceived validity and security, not on market popularity. Cambridge English and TOEFL have decades of psychometric research backing their scoring systems, while Duolingo English Test relies on adaptive algorithms and AI-driven item generation, a methodology that some admissions offices still view with skepticism.

Dr. Elena Ríos, director of international admissions at the Universitat de Barcelona, explained the dilemma in an interview with El País in March 2026. «We trust exams that have undergone rigorous validation studies published in peer-reviewed journals,» she said. «Duolingo has shared some technical reports, but the level of external scrutiny is not comparable to what Cambridge or ETS have provided over decades.»

«We trust exams that have undergone rigorous validation studies published in peer-reviewed journals. Duolingo has shared some technical reports, but the level of external scrutiny is not comparable to what Cambridge or ETS have provided over decades.»

Duolingo has responded by commissioning third-party validity studies. A February 2026 report by the Language Testing Research Centre at the University of Melbourne found that Duolingo English Test scores correlated strongly (r = 0.81) with TOEFL iBT scores among a sample of 1,200 test-takers. The company also announced partnerships with proctoring vendors to enhance test security, including facial recognition and browser lockdown.

Still, Cambridge and ETS hold structural advantages. Cambridge English exams are backed by Cambridge University Press & Assessment, a department of the University of Cambridge with a 150-year history in educational assessment. TOEFL is administered by ETS, a nonprofit organization that also manages the GRE and SAT exams. Both organizations have extensive relationships with university admissions offices and accreditation bodies.

Duolingo, by contrast, is a for-profit company valued at $6.5 billion as of its November 2024 IPO. That commercial structure raises questions about incentive alignment. A March 2026 op-ed in Inside Higher Ed argued that for-profit testing companies face pressure to maximize test volume, which could create conflicts of interest around exam difficulty and scoring rigor.

Regional Divergence

Acceptance patterns vary sharply by region. In the United States and Canada, Duolingo has made significant inroads at mid-tier and regional universities, while top-ranked institutions remain conservative. In Europe, Cambridge English dominates due to alignment with the Common European Framework of Reference for Languages (CEFR), the standard framework used across EU countries.

Data from the British Council’s January 2026 report on global English testing shows that Cambridge English exams accounted for 68% of all language certifications accepted by European universities in 2025. TOEFL held 22%, and Duolingo captured just 7%. The picture is different in Latin America, where Duolingo’s low cost and accessibility have driven adoption. A December 2025 study by the Inter-American Development Bank found that 54% of Brazilian universities now accept Duolingo scores, up from 12% in 2022.

In Asia, TOEFL remains the default for students targeting US universities, but local alternatives are emerging. Japan’s EIKEN test and China’s National English Proficiency Test (NEPT) are gaining traction domestically, though neither has significant international recognition. The fragmentation is creating inefficiencies: students often take multiple exams to cover all application scenarios, spending $500 or more on certification alone.

What Employers Actually Want

The certification landscape is further complicated by employer preferences, which often diverge from university requirements. A February 2026 survey by LinkedIn Learning found that 62% of hiring managers in multinational companies do not require formal language certification, preferring to assess English proficiency through interviews and work samples.

For roles that do require certification, employers tend to favor exams aligned with professional contexts. The Business English Certificate (BEC), administered by Cambridge, is widely recognized in corporate Europe. TOEIC, another ETS product, dominates in Japan and South Korea for workplace English assessment. Duolingo has no direct competitor in the professional segment, though the company has hinted at future offerings.

The disconnect between academic and professional standards creates friction for international students. A graduate who earns a TOEFL score sufficient for university admission may still face additional language testing when applying for internships or jobs in Europe, where Cambridge or IELTS credentials are more common. Startups like Spain-based Lingoda and US-based Preply have begun offering bundled language training and certification prep, but the fragmentation remains unresolved.

The AI Proctoring Controversy

All three major platforms now rely heavily on AI-powered proctoring, a practice that has drawn criticism from privacy advocates and educators. Duolingo’s test uses webcam monitoring, screen recording, and keystroke analysis to detect cheating. Cambridge and ETS employ similar technologies for their online exams, supplemented by human review for flagged sessions.

A March 2026 investigation by The Guardian found that algorithmic proctoring systems produce false positives in 4–8% of test sessions, disproportionately affecting test-takers with disabilities, non-standard home environments, or darker skin tones due to facial recognition biases. Duolingo told The Guardian that it reviews all flagged cases manually and allows test-takers to appeal, but critics argue that the burden of proof falls on students rather than the platform.

The European Data Protection Board issued guidance in January 2026 recommending that online exam providers obtain explicit consent for biometric data collection and limit data retention to 30 days. Duolingo and Cambridge have committed to compliance, but enforcement remains uneven across jurisdictions. ETS, based in the United States, is not subject to GDPR but faces potential state-level regulation in California and New York.

The proctoring debate is not purely technical—it reflects deeper tensions about access and equity. Remote testing was supposed to democratize certification by eliminating the need for travel to test centers. In practice, it has created new barriers: reliable internet, a quiet private space, and a device with a working webcam. A December 2025 study by UNESCO found that 18% of test-takers in Sub-Saharan Africa and South Asia failed to complete online English exams due to connectivity issues, compared to less than 2% in North America and Western Europe.

What This Means for Students and the Sector

The fragmented certification landscape forces students to make strategic choices with incomplete information. The safest bet remains Cambridge or TOEFL for applicants targeting top-tier universities or graduate programs. Duolingo offers a low-cost, low-friction alternative for students applying to institutions that explicitly accept it, but the risk of non-acceptance at preferred schools remains real.

Industry observers expect consolidation. Michael Zhang, an education technology analyst at HolonIQ, told EdSurge in February 2026 that the current three-platform equilibrium is unstable. «Either Duolingo builds enough institutional credibility to displace legacy players, or Cambridge and ETS adapt their pricing and delivery models to neutralize the upstart,» Zhang said. «A fourth scenario—regulatory intervention to standardize certification—is possible in Europe but unlikely in the US.»

For the sector, the stakes extend beyond market share. Language proficiency testing is one of the few remaining bottlenecks in international education. If online certification can be made both valid and accessible, it could unlock mobility for millions of learners currently excluded by cost or geography. If it devolves into a credential arms race, with students taking multiple exams to hedge their bets, the result will be higher costs and greater inequity.

Cambridge has signaled that it will not compete primarily on price. A spokesperson told Times Higher Education in January 2026 that the organization views certification as a public good and prioritizes psychometric rigor over volume. ETS has introduced tiered pricing in select markets but remains committed to its traditional four-hour exam format. Duolingo, meanwhile, has hinted at new product launches, including a potential business English test and expanded resources for test preparation.

The regulatory environment will likely determine the outcome. If European universities move toward a unified digital credential framework—similar to the European Digital Identity initiative—Cambridge’s CEFR alignment gives it a structural advantage. If US accreditation bodies adopt stricter standards for online exam validity, Duolingo may face pressure to open its algorithms to external audit. And if emerging markets develop their own national certification systems, the global market could fragment further, reducing the value of any single credential.

What is already clear is that the winner will not be the platform with the most users, but the one that convinces institutions it can be trusted. In a sector where reputational risk is measured in decades, not quarters, that is a slower, harder game to win. The question is whether Duolingo’s technology-first approach can build the kind of institutional legitimacy that Cambridge and ETS inherited from a different era—or whether the future of language certification will look more like the past than the pitch decks suggest.