EasyMobile AppFrontierClear niche and buyerAI model/API accessPayments via Stripe

Operator-Reported

AI Language Tutor App for Speaking Practice, From a YC Startup

AI speaking tutor app (Y Combinator W24) for practising English and other languages, with feedback on vocabulary, grammar and pronunciation, including

In plain English

Fluently is a phone app for practising speaking English and other languages with AI. You talk with an AI tutor and it gives feedback on your words and grammar. It can also check your real work calls and point out mistakes. Learners pay a subscription.

Automation85%

Startup costNot disclosed

Time to first $Not disclosed

Monthly range*$500,000 Annual ÷ 12

$6M ARR (founders, Nov 2025)

DifficultyEasy

SourceARR Founder - Fluently hits $6M ARR ↗

Operator: Yurii Rebryk and Stanislav Beliaev (co-founders)

Operator-Reported

A named, real operator ran this and shared results publicly. The figures are their own.

Not disclosed.

The tool stack

App Store ↗

iOS distribution

Android distribution

LLM / vision

Whisper ↗

Pay per minute (API) or free self-hosted

Speech-to-text

Prices are the vendors' published list prices as researched in Oct 2026 and change often — always check the vendor's pricing page.

Step-by-step setup

Pick working adults who need to speak better English for their jobs.
Build voice practice with an AI tutor, plus feedback on real calls the user records.
Show clear progress on words, grammar and pronunciation.
Subscription; grow with paid ads and social video at scale.

What's automated vs. the human 15%

The machine does

Core AI generation/analysis
Billing and onboarding

You still do

Product quality and support
Distribution and marketing
Compliance and edge cases

Overview

AI speaking tutor app (Y Combinator W24) for practising English and other languages, with feedback on vocabulary, grammar and pronunciation, including analysis of the user’s real calls.

Operator: Yurii Rebryk and Stanislav Beliaev (co-founders). Website: https://getfluently.app/

Estimated split: about 85% of the work automated, 15% human.

Realistic income

ARR Founder reported in November 2025, from the founders’ own post, that Fluently reached $6 million in annual recurring revenue. Fluently is a funded Y Combinator startup with a team. This figure is operator-reported, not independently verified, and may be out of date. This is one operator’s result, often after months or years of work, and doesn’t predict yours. Check the live source — numbers change.

Risks

Very crowded market (Praktika, Speak, Pingo, Duolingo).
Recording real calls raises privacy and consent questions.
Paid ads at this scale need money most solo builders don’t have.
Startup cost and time to first dollar are not disclosed.

*Income figures are illustrative ranges based on public pricing and typical outcomes reported by practitioners, not guarantees. Most new online businesses earn little or nothing at first. Not financial, legal or tax advice.