Fluently: Revenue, team and how it was built
Fluently (AI language tutor app for speaking practice, United States): US$6M annual recurring revenue, November 2025. Evidence grade C: the founder's own figures, not verified by anyone else. Team: 2 co-founders; the Y Combinator profile lists a team size of 2 and the careers page says "a team you can count on your fingers"; headcount at the headline figure not published. Launched August 2023; still running, revenue growing.Added 27 October 2026
- Outcome
- US$6M annual recurring revenue, November 2025Revenue growing
- Evidence
- C the founder's own figures, not verified by anyone else
- Launch
- August 2023
- Status
- Still running
- Team
- 2 co-founders; the Y Combinator profile lists a team size of 2 and the careers page says "a team you can count on your fingers"; headcount at the headline figure not published
- Outside funding
- Y Combinator (Winter 2024) and a US$2M seed round in June 2024, led by Pioneer Fund
- Group
- Learning and study
- Main channel
- Creators and short videos
Fluently is an AI tutor for speaking practice. The learner talks, the app answers by voice, and after each answer it shows corrections. Two technical parts do the work: speech recognition, a model that turns spoken audio into text, and pronunciation scoring, a model that compares the sounds a learner made with the expected sounds and marks the ones that differ. The company's privacy policy says it uses its own self-hosted speech-recognition and pronunciation models together with models from third-party AI services. The app is free to download and sells Premium subscriptions in the App Store, from US$9.99 a week to US$179.99 a year.
Yurii Rebryk and Stanislav Beliaev, former university roommates and machine-learning engineers, started the company in San Francisco in 2023. Their first product was a desktop coach that listened to work calls. They joined Y Combinator, a startup program that invests a small amount in each company of a batch, in Winter 2024, and raised a US$2 million seed round, a first outside investment, in June 2024. The mobile tutor launched on Product Hunt in March 2025. In posts on X, quoted by the founder directory Arrfounder, Rebryk reported US$5 million of annual recurring revenue (ARR, the subscription revenue of one year at the current rate) on 8 September 2025, more than US$5 million on 23 October 2025, up from US$48,000 at the start of the year, and US$6 million on 7 November 2025.
Every revenue figure on this page is the founder's own statement, grade C. The three posts agree with each other, but no payment processor, buyer or journalist has confirmed them, and no newer figure was found after November 2025. The page also shows four failed companies that sold language lessons with human tutors, when each lesson still needed a paid teacher.
How much revenue does Fluently make?
Each row shows the evidence grade and the source numbers from the list at the end of this page. The grades are explained in How Aiolum verifies.
| Fact | Value | Grade | How we know | Sources |
|---|---|---|---|---|
| Annual recurring revenue, 7 November 2025 | US$6,000,000 | C | Founder's post on X, quoted by Arrfounder: "Fluently hit $6,000,000 ARR!", "0 → $1M ARR: 634 days", "$1M → $6M ARR: 148 days". | [1] |
| Monthly value of the November 2025 figure | US$500,000 a month | calc | Calculated: 6,000,000 / 12. | [1] |
| Annual recurring revenue, 23 October 2025 | more than US$5 million, up from US$48,000 at the start of 2025 | C | Founder's post, quoted by Arrfounder: "I scaled Fluently app from $48K → $5M+ ARR during this year (that's 100x growth)". US$48,000 a year is about US$4,000 a month (calculated: 48,000 / 12). | [2] |
| Annual recurring revenue, 8 September 2025 | US$5,000,000 | C | Founder's post, quoted by Arrfounder: "Fluently just hit $5M ARR", "0 to $500k ARR: 627 days", "$500k to $5M ARR: 126 days". | [3] |
| Date of US$500,000 ARR | about 5 May 2025 | calc | Calculated: 8 September 2025 minus 126 days. | [3] |
| Date of US$1 million ARR | about 12 June 2025 | calc | Calculated: 7 November 2025 minus 148 days. The two posts together put only 38 days between US$500,000 and US$1 million. | [1, 3] |
| Start of the founder's day count | 17 August 2023 or 17 September 2023 | calc | Calculated: 8 September 2025 minus 753 days (627 + 126) gives 17 August 2023; 7 November 2025 minus 782 days (634 + 148) gives 17 September 2023. The posts do not say what day zero was. This page uses August 2023 as the start. | [1, 3] |
| Growth from September to November 2025 | plus 20% in 60 days | calc | Calculated: 6,000,000 / 5,000,000 equals 1.2, from 8 September to 7 November 2025. | [1, 3] |
| Short-form video views | more than 1 billion in 200 days, with no ad spend | C | Founder's post of 23 October 2025, quoted by Arrfounder: "A big part of this came from short-form videos" and "In just 200 days we got 1B+ views across TikTok/IG/YT with $0 ad spend!" | [2] |
| Team | 2 co-founders; team size 2 on the Y Combinator profile | C | Y Combinator company page, read 27 October 2026: "Team Size: 2". Careers page: "a small ML-heavy team" and "built by a team you can count on your fingers"; no open roles in August 2026. No source gives the headcount at the November 2025 figure. | [5, 6] |
| Outside funding | US$2 million seed round, June 2024, after Y Combinator Winter 2024 | C | About page: "The round is led by Pioneer Fund, with angels including Burkay Gur (fal), Alex Mashrabov (Higgsfield) and Arash Ferdowsi (Dropbox)." The Y Combinator page links a TechCrunch article of 28 June 2024 on the round, which this page did not open because TechCrunch blocks AI crawlers. | [4, 5] |
| App Store ratings, October 2026 | 4.8 from 6,100 ratings; age rating 4+ | B | Apple's App Store page: "6.1K Ratings", "4.8". Seller: Fluently, Inc. | [7] |
| Downloads | more than 1 million on Google Play | C | About page: "1M+ Google Play downloads" and "more than 160 countries". Not checked on Google Play. | [4] |
| Languages taught | 15 | C | About page: English, Spanish, French, German, Italian, Portuguese, Polish, Russian, Korean, Hebrew, Arabic, Chinese, Japanese, Dutch and Greek. | [4] |
| Speech models | own self-hosted speech-recognition and pronunciation models, plus third-party AI services | C | Privacy policy, last updated 22 July 2026. Users can turn off the use of their recordings for training in the settings. | [10] |
| Company | Fluently, Inc., San Francisco | C | About page and the App Store seller line. | [4, 7] |
| Time from the start of the day count to the US$6 million figure | 27 months | calc | Calculated: August 2023 to November 2025. | [1, 3] |
How to read this table: a grade C value is a founder statement in a post on X, read through Arrfounder's quotation, or a statement on the company's own pages or its Y Combinator profile. Grade B is a figure that Apple's App Store page shows. A "calc" value was computed on this page from the rows above it.
| Plan | Per month, billed yearly (US$) | Per month, billed monthly (US$) | Limit |
|---|---|---|---|
| Premium, weekly | 9.99 or 19.99 a week | up to 100 minutes of speaking a week, according to the company's review reply | |
| Premium, monthly | 24.99 | same | |
| Premium, 3 months | 15.00 or 30.00 (44.99 or 89.99 per 3 months) | same | |
| Premium, annual | 7.50 or 15.00 (89.99 or 179.99 a year) | same | |
| Course: Workplace English | 19.99, in-app purchase | billing type not stated | |
| Fluently for Teams | 20 | per employee, as shown against a human tutor; analytics, reporting, seat and billing management |
The App Store lists two prices for the weekly, three-month and annual Premium plans; the listing does not say which offer shows which price. Per-month values for the three-month and annual plans are calculated (price / 3 and price / 12). In a reply to a review the company wrote that Premium includes up to 100 minutes of speaking practice a week and that a Pro plan has unlimited speaking time; Pro prices are not listed separately on the App Store page. The Teams page shows Fluently at US$20 a month against a human tutor at US$240 a month for 2 hours a week, with analytics and seat management.
When did Fluently launch, and how did it grow?
From a desktop coach for work calls in 2023 to US$6 million of annual recurring revenue in November 2025, by the founder's account. Each entry carries its grade.
- 2023CFormer university roommates Yurii Rebryk and Stanislav Beliaev start Fluently in San Francisco. The first product is a desktop AI coach that listens to the user's side of work calls and gives feedback on pronunciation, grammar and pace. [4]
- August to September 2023calcDay zero of the revenue day counts in the founder's later posts (calculated). [1, 3]
- Winter 2024CFluently joins the Y Combinator Winter 2024 batch. Its launch post there sells an English tutor "20x cheaper" than a human one. [4, 5]
- June 2024CA US$2 million seed round led by Pioneer Fund closes before Demo Day. [4]
- Start of 2025CUS$48,000 of annual recurring revenue, about US$4,000 a month, by the founder's later account. [2]
- March 2025CThe mobile AI tutor launches on Product Hunt and finishes first Product of the Day and third of the week. [4]
- About 5 May 2025calcUS$500,000 of annual recurring revenue (calculated from the founder's day count). [3]
- About 12 June 2025calcUS$1 million of annual recurring revenue (calculated from the founder's day count). [1]
- 8 September 2025CThe founder posts US$5 million of annual recurring revenue, 126 days after US$500,000. [3]
- 23 October 2025CHe posts more than US$5 million, a 100-fold rise during 2025, and more than 1 billion short-video views in 200 days with no ad spend. [2]
- 7 November 2025CHe posts US$6 million of annual recurring revenue, 148 days after US$1 million. [1]
- November 2025CA free accent-assessment tool, Accent Guru, is first Product of the Day and of the Week on Product Hunt. [4]
- 22 July 2026CThe privacy policy names the company's own self-hosted speech-recognition and pronunciation models and third-party AI services. [10]
- October 2026BThe App Store shows 6,100 ratings at 4.8; the Teams page shows the company version at US$20 a month against a human tutor at US$240. [7, 9]
Why did Fluently work?
Four causes, in the order they mattered. Each one is a reusable lesson.
Short videos in volume
In October 2025 the founder wrote that a large part of the growth during 2025 came from short-form videos on TikTok, Instagram and YouTube, with more than 1 billion views in 200 days and no ad spend. He called the method a blueprint for UGC growth, user-generated-content style videos.
Speaking, not vocabulary
The company targets people who "have studied a language for years and understand it well but still cannot speak confidently". These learners already know that flashcard apps did not help them speak, so the offer is easy to understand: a conversation partner that corrects you after each answer.
Priced against a human tutor
The Teams page compares Fluently at US$20 a month with a human tutor at US$240 a month for two hours a week. In the App Store the company sells practice by the week, the month, three months or the year.
Machine-learning founders who own the speech models
Both founders did machine-learning research internships; the CTO worked on speech recognition. The privacy policy says the pronunciation and speech-recognition models are self-hosted, so the scoring of sounds runs on models that the company controls, while other parts use third-party AI services.
How it was built
These details come from the company's About, privacy and Teams pages and its App Store listing. They are grade C, except the App Store data. [4, 10, 7, 2, 8]
- Two founders with machine-learning research internships at Google and Nvidia; the CTO's focus was speech recognition.
- Self-hosted speech-recognition and pronunciation models, plus models from third-party AI services (privacy policy, July 2026). Recordings can be used for training unless the user turns this off in the settings.
- An iPhone app (iOS 16.4 or later) and an Android app. Subscriptions are sold in the App Store; in a reply to a review the company says a user cancels "through the official app store (iOS App Store) or Stripe", so some subscriptions are paid through Stripe.
- Google Analytics measures use of the site; Google sign-in and an optional Google Calendar connection show the user's upcoming meetings in the app.
- Marketing through short-form videos on TikTok, Instagram and YouTube, by the founder's account, and two first places on Product Hunt. The site also offers free tools, such as an English level test, a mic test and an English-to-IPA converter.
Tools named in the sources
Each one opens its page in the Tools tab, with every story that uses it.
Who tried this before Fluently, and why did they fail?
Four companies in the Loot Drop database sold language lessons through human tutors, or language courses to millions of users, before an AI tutor could hold a spoken conversation for a few dollars a week. The values below are from that database and are not independently verified.
VIPKid
The promiseOne-to-one online English lessons for Chinese children with North American teachers by video.
Why it diedChina's 2021 education rules banned foreign tutors and curriculum for school subjects, which removed its business model, according to the database. Every lesson needed a paid teacher.
TutorGroup (iTutor)
The promiseLive English lessons with Western teachers for learners in Asia.
Why it diedThe 2021 ban on foreign tutors removed most of its revenue, according to the database, while the cost of each new student and the turnover of tutors were already high.
Teacher Finder
The promiseMatch language learners directly with tutors, without expensive language schools.
Why it diedBetter-funded competitors won, and its MVP built on Zapier automation could not change fast enough, according to the database. Each lesson still needed a paid human tutor.
Hujiang
The promiseOnline language learning and school courses for millions of users with a free tier.
Why it diedA failed stock market listing exposed a high cost per customer and negative margins; most registered users never paid, according to the database.
The failed startups come from Loot Drop, a free database of dead startups, retold here in our own words. Loot Drop describes its entries as AI-assisted summaries of public sources, so these cards carry no evidence grade.
What changed
Three of the four predecessors sold time with a human teacher. Their cost grew with every lesson, and their supply of teachers and students depended on one country's rules. Hujiang sold content to a huge free audience that rarely paid. Fluently sells a tutor that is software: the cost of one more conversation is the cost of running the models, so it can sell unlimited or weekly practice at a price that a human tutor cannot match.
The other change is distribution. The founder said that short videos on TikTok, Instagram and YouTube brought a big part of the 2025 growth, with no ad spend on the videos, where the tutoring platforms paid high costs for each new student. The weakness is that the same models are available to every competitor, and the App Store page itself suggests other AI speaking apps, such as Talkpal and JustSpeak, under "You Might Also Like".
Can one person copy Fluently now?
The product, yes. The scale, hard.
A speaking tutor that corrects pronunciation can now be built from available speech and language models, and many competitors already sell one. What is harder to copy is what the founders say drove the growth: machine-learning skill to run their own pronunciation models, a seed round, and a short-video machine that the founder said reached more than a billion views in 200 days.
Where it is still open: Speaking practice for one situation (job interviews, medical staff, call centres), for one language pair, or for companies that pay for their employees' language training.
- 1Pick learners who already tried the beginner apps and still have a painful gap, such as speaking at work.
- 2Show the correction after each answer, so the value is visible in the first minutes.
- 3Price against the human alternative, and sell weekly and yearly plans in the app stores.
- 4Make many short videos of the problem and the product, and post them on several platforms every day.
- 5Own the part of the stack that defines quality, here pronunciation scoring.
What could go wrong for Fluently?
The risks are the mirror image of the causes above.
Self-reported revenue
Every revenue figure is the founder's own post on X, read through Arrfounder's quotation (Arrfounder says it is "not responsible for the accuracy of the data"). The posts of 8 September, 23 October and 7 November 2025 agree with each other, but no payment processor, buyer or journalist has confirmed them, no TrustMRR profile was found, and no figure after November 2025 was found.
Day counts that do not fit one start date
The September post counts 627 + 126 days to US$5 million; the November post counts 634 + 148 days to US$6 million. Taken from the post dates, they start one month apart (17 August and 17 September 2023), and together they put only 38 days between US$500,000 and US$1 million. Either the posts count from different days, or a milestone was reached before the post that announced it.
Team size not exact, and venture money
The Y Combinator profile says "Team Size: 2" and the careers page says the app is "built by a team you can count on your fingers", which means ten or fewer. No source gives the headcount at US$6 million ARR. The company took Y Combinator money and a US$2 million seed round led by Pioneer Fund, so it is not bootstrapped.
UGC videos and ads
The founder's October 2025 post announces "my blueprint for hacking UGC growth on social media". UGC means user-generated content: videos made to look like ordinary users' posts. This page could not read the thread on X, so it does not know whether the videos used paid creators, the company's own accounts or AI presenters. The post says "$0 ad spend" for the videos, but App Store reviews mention Instagram ads ("I purchased this app through an ad on Instagram"), and the privacy policy says Google may serve Fluently ads.
Usage limits and billing complaints
The FAQ says a Pro subscription has "no daily or monthly limits". In App Store reviews, one user called a weekly cut-off "Classic bait and switch", and the company replied: "Premium includes up to 100 minutes of speaking practice per week, while Pro provides unlimited speaking time." Other reviews complain of weekly charges and refunds; the company answered that it "always" provides refunds.
Ratings this page could not check
The About page shows "4.8 Trustpilot, 2,000+ reviews". Trustpilot blocks AI agents, so this page did not open it, and it could not check how reviews were collected. The App Store rating of 4.8 from 6,100 ratings is shown on Apple's page.
Voice recordings
The privacy policy says the company may use voice recordings and transcripts to train its own and third-party models, and may "license, or sell" de-identified data. Users can switch off the training use in the settings.
The founders' earlier company
Both founders co-founded a startup that built "real-time face and voice swap for mobile" and grew it from 2 to 50 people. The sources do not name it. Fluently itself does not sell face or voice swapping.
Sources
The grade next to each source is the best grade that the source can support. "Read in full" means that the text of the page was downloaded and the numbers were checked in it.
- C Arrfounder: GetFluently Hits $6M ARR, 7 November 2025, quoting Yurii Rebryk's post on XRead in full in the copy downloaded on 27 October 2026. Could not open the post on X (it needs a login); cited from Arrfounder's quotation of https://x.com/yrebryk/status/1986868927465726091. Source for the headline figure and the day counts.
- C Arrfounder: GetFluently Surpasses $5M ARR, 23 October 2025Read in full on 27 October 2026. Cited from Arrfounder's quotation of https://x.com/yrebryk/status/1981407422163071383. Source for the US$48,000 start of 2025, the short-form videos and the UGC post.
- C Arrfounder: GetFluently Hits $5M ARR, 8 September 2025Read in full on 27 October 2026. Cited from Arrfounder's quotation of https://x.com/yrebryk/status/1965102111970197781. Source for the US$5 million figure and its day counts.
- C Fluently: About Fluently, the team behind the AI language tutorRead in full in the copy downloaded on 27 October 2026. Source for the founders, the dates, the seed round and its investors, the languages and the download count.
- C Y Combinator company page: FluentlyRead in full on 27 October 2026. Company-supplied profile. Source for the team size, the batch, the founding year and the launch post.
- C Fluently careers pageRead in full on 27 October 2026. Source for the small-team statements and the open roles.
- B App Store: Fluently: AI Language Learning, by Fluently, Inc.Read in full on 27 October 2026. Apple's listing gives the ratings, the age rating and the in-app purchase prices; the reviews and the company's replies are grade C.
- C Fluently home pageRead in full in the copy downloaded on 27 October 2026. Source for the product description, the FAQ and the free tools.
- C Fluently for TeamsRead the pricing comparison and the plan features on 27 October 2026.
- C Fluently Privacy Policy, last updated 22 July 2026Read the sections on data use, models, analytics and advertising on 27 October 2026.
- C Loot Drop database export, 1,749 failed startupsLocal export. AI-written summaries, not independently verified. Source for the failed predecessors.