Cambly

A video call away from fluency

At this exact moment, somewhere in Istanbul, a software engineer is practicing a job interview in English with a tutor from Atlanta. In Tokyo, a student is drilling pronunciation with someone in Melbourne. In Riyadh, a hotel manager is rehearsing a presentation with a retired teacher from Ohio. All of them found each other through Cambly - a platform that doesn't care what time zone you live in or what your accent sounds like. It just connects people.

Cambly is an on-demand English tutoring platform that puts learners face-to-face with native English-speaking tutors via live video chat, around the clock, in 190+ countries. You can start a lesson within minutes of signing up. You can pick your tutor by accent, teaching style, or whether they look like someone your brain will actually trust. You can replay every lesson. And since October 2024, Cambly's AI layer will annotate your transcript, flag your mistakes, and build you personalized follow-up exercises - all from 12 years of real conversation data.

This is not a language app with cartoon owls. This is tutoring.

A year's worth of 1-on-1 English tutoring happens on Cambly every single day. Read that again.

The world's most valuable language - and the hardest to practice

Somewhere between "I studied English for eight years" and "I froze in my first job interview in English" lies one of the most frustrating gaps in education. Textbooks teach grammar. Apps teach vocabulary. Classrooms teach test-taking. None of them teach you to actually talk.

English fluency has a dirty secret: you can only get it by speaking English, a lot, with people who speak it well. The most reliable path to that has always been immersion - living in an English-speaking country long enough for the language to stop feeling foreign. That path costs tens of thousands of dollars and requires a visa.

The result is a world where English proficiency is distributed almost entirely by wealth and geography. Professionals in non-English-speaking countries who want international careers often hit a ceiling - not because of their expertise, but because of their accent, their hesitation, their vocabulary in a conference call. That's not a skills gap. That's a distribution problem.

Two engineers. Two trips abroad. One idea.

Sameer Shariff went to Argentina in 2010. Kevin Law went to France. Both came back with something neither had managed to build in years of language study back home: they could actually speak. The immersion effect is well-documented - drop a motivated adult into a country where they have to communicate, and progress accelerates. What neither of them could explain was why that phenomenon required a plane ticket.

The answer, they figured, was pretty simple: before smartphones and high-quality video calling, you couldn't replicate the experience from your couch. By 2012, you could. So they quit their jobs - both had worked at Google, both had seen what technology could do at scale - and started building Cambly.

They joined Y Combinator in 2014. The early years were lean - Cambly initially failed to raise a Series A, which is the kind of thing that kills most startups. Instead, they focused on unit economics, built toward profitability, and kept iterating on the product. The bootstrapped discipline turned out to be a long-term asset. By the time Benchmark and Bessemer showed up with $40M in 2022, Cambly wasn't desperate for the money. It was ready to accelerate.

What Cambly actually does

The core interaction is simple enough to explain in one sentence: you open the app, pick a tutor, and talk. What's less obvious is how much thinking went into every surrounding detail.

Every lesson is recorded. Every recording gets an annotated transcript that highlights new vocabulary, flags errors, and suggests alternatives - not as punishment, but as a study tool you can revisit at 2am on a train. Since October 2024, an AI layer generates personalized follow-on activities based on what actually happened in your lesson - if you struggled with conditional sentences, your next practice session will lean into that. If you had a great conversation about cooking, your vocabulary exercises will meet you there.

You can filter tutors by accent (American, British, Australian, Canadian), teaching specialty, availability, or personality. You can book in advance or start in minutes. Lessons run from 15 to 60 minutes. The company maintains a strict rule: every Cambly tutor must be a native English speaker from the US, UK, Australia, or Canada. No exceptions. That's the product guarantee.

The AI doesn't replace the tutor. It makes every hour with a tutor more useful before, during, and after. A sensible division of labor.

Numbers, investors, and what the market says

Cambly's credibility case doesn't rest on press releases. It rests on a decade of operation in 190+ countries, a track record of reaching profitability before taking big VC money, and an investor list that reads less like a cap table and more like a "people who know what good looks like" list.

When the co-founders of Airbnb and Pinterest write personal checks into an edtech company, it's worth asking why. The short answer is probably that Cambly's business looks more like a marketplace than a school. Tutors are independent contractors who earn per minute of lesson time. The platform matches supply and demand globally, 24/7, and takes a cut of every session. It's a model that scales well and burns less cash than alternatives built on employed teachers and fixed curricula.

English fluency as infrastructure

There's a reason Cambly's largest markets are Turkey, Japan, South Korea, Brazil, and the Middle East. In each of those countries, English proficiency has a direct and measurable effect on career trajectory. It's not a nice-to-have. For millions of people, it's the difference between the job they have and the job they want.

Cambly's founding thesis was that immersive language learning shouldn't require moving to another country. Twelve years of operation hasn't changed that thesis - it's reinforced it. The platform now serves learners from age 5 (Cambly Kids) to corporate executives (Cambly Business), from casual conversationalists to IELTS candidates with specific score targets. The common thread is access: the idea that where you were born shouldn't determine how far your English can take you.

The AI features launched in 2024 extend that logic. Data from millions of real lessons - what vocabulary trips learners up, which grammar patterns persist as errors, how speaking confidence correlates with lesson frequency - is now feeding back into the learning experience itself. The longer Cambly runs, the smarter it gets. That's a compounding advantage that's genuinely hard to replicate.

The bet on human connection

Here's the tension Cambly has navigated quietly: AI can now generate conversational English practice that's pretty good. Cambly AI Chat is free and available 24/7. They offer it themselves. So what does a human tutor offer that a language model doesn't?

The answer, for most learners, turns out to be a lot. The accountability of a scheduled session. The unpredictability of a real person's questions. The subtle social feedback of someone who actually lives in English - who laughs at certain things, who says "hmm" in ways that tell you something went sideways, who can switch gears when the prepared lesson isn't working. Language is social. Fluency is built in relationship, not in isolation.

Cambly's AI-plus-human hybrid model hedges the right way: AI handles the prep work, the post-session review, the infinite low-stakes practice reps. The human tutor handles what AI is bad at, which is being a person worth talking to. For a platform that's staked its whole thesis on the power of real conversation, that's a coherent position.

The software engineer in Istanbul is still on that call. The student in Tokyo is laughing at something her tutor from Melbourne just said. The hotel manager in Riyadh just finished his presentation rehearsal. Somewhere else, a five-year-old is playing a word game with someone from Ohio who has done this a thousand times before and genuinely enjoys it. That's a lot of doors being opened at once.

Cambly in action

See how Cambly works, hear from tutors and students, and get a sense of the platform's culture.