REPLICATION GUIDE · AI Businesses

Language learning eReader

Readlang is a language-learning reader for independent learners: users import permitted texts, click for translation/context and review saved vocabulary with spaced repetition.

● Already earning  $10K/mo  ·  Copy it for about $24K

Replication snapshot

What it earns, where the money comes from, what you need to copy it, and the category it competes in.

Monthly revenue$10K/mo
Copy budget$24K
Growth channelsEmail marketing, Direct sales
Tools to copyNot disclosed
CategoryAI Businesses

How to copy this business and make money

Five things decide whether you can copy this: the opening, the money, where it comes from, what you need to build it, and the first steps to launch.

QUICK LOOKFree summary — what it sells, and the total budget
Test a 180-day adult Spanish reader subscription, not the complete multilingual service. Interview fifteen volunteer adult readers for one paid founder hour each including preparation and research follow-up. Five free one-month accounts run on days 61–90; seek three paid users at US$6 monthly for three months from day 91. Total copy budget: $24K.

Want to see how that $24K splits line by line, what each line buys, and when to stop? The full breakdown is below.

PROVEN · ALREADY MAKING MONEY

Thousands of people are already making money with this playbook

If you want to make money, read this part. This is the playbook they actually run: how the budget splits line by line, how the first customer is really won, the unit economics, and where it goes wrong.

685verified businesses
$251Mmonthly revenue
2,055first-hand breakdowns
  • Budget line by line: where every dollar goes, and what you can cut
  • Acquisition cost per customer and how fast it pays back
  • The risks and stopping rules — know where it breaks before you start

Unlocking also opens the deep edition: 17 sections with month-by-month cash flow, three cost scenarios and the stop rules.

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Open-source stack you can start from

Each repository was checked against the GitHub API for existence, stars and licence terms. Fork one instead of starting from zero. Where it says AGPL, read the terms before shipping a paid product.

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Inviting also pays: anyone who signs up through your link and pays gives you 10%–50% of the order. How inviting pays →

What this business does

Readlang is a language-learning reader for independent learners: users import permitted texts, click for translation/context and review saved vocabulary with spaced repetition. Browser tools also work on supported external pages. Steve Ridout created it to study Spanish through novels and later created Duolingo Stories. After a sale to Duolingo, he bought Readlang back in February 2023; current terms name Spain's Readlang SL. The October 2026 homepage displays 550,086 people, not verified active subscribers. Ridout reported approximately €6,000 monthly revenue in December 2023, unaudited and historical. Current finances are unknown. The operating product includes audio and broader languages; our adult Spanish pilot is narrower.

Replication breakdown

01

Why it works — and where your opening is

Learners may lose reading momentum when repeatedly switching between a chosen text and a dictionary. Ridout's stated motivation supports this product rationale, not proof that all alternatives fail. Inline assistance and saved review cards connect understanding now with practice later, potentially reducing copying and preserving useful context. Interesting new passages and scheduled vocabulary review provide repeat-use reasons; current cohort retention is unknown. Editorial choices, familiar interaction and accumulated vocabulary may help, but dictionaries and flashcards are reproducible. Test whether adult Spanish learners prefer focused reading sessions, clear lookup limits and exportable cards. Those are proposed purchase reasons, not proven superiority or guaranteed fluency.
02

The money: revenue, cost, and margin

Monthly revenue$10K/mo

Estimated from technical complexity, people, tools, and delivery scope.

Ridout's December 2023 post reports about €6,000 monthly revenue. Starter Story quotes a December 2024 podcast reporting US$11,000 over thirty days; annual payments mean this is not MRR. Both are historical and unaudited; current profit/revenue and telephone verification are unknown. US$24,000 startup and US$48,000 monthly remain startup×2 planning, not forecasts. API, hosting, paid labor, payments, refunds and acquisition are costs. Our assumed US$6 user-month costs US$6.98, losing US$0.98 before acquisition/fixed costs. Nine user-months after US$3,571 full acquisition lose US$3,579.82 before other fixed costs/tax. Funding gap is US$23,946 including reserve. Revenue is not profit.
03

Where the revenue comes from

Current official pricing shows individual Premium at $6 monthly/$48 yearly and Premium Plus at $15/$120; the dollar currency is unspecified. Free word translation and limited phrase/context use lead to upgrades for broader capacity, audio and stronger Plus AI. Stripe subscriptions renew until cancellation, with access through the paid period. Terms generally exclude partial-period refunds but preserve mandatory consumer rights and unused-fee refunds if the provider terminates without user breach. Current subscriber counts, revenue mix and margins are unknown. Our three-month US$6 monthly test is a separate hypothesis with explicit expiry and refunds, not an original-company quotation. No current classroom, advertising or book-sales income is established.
04

Tools you need to replicate it

The June 2026 privacy policy discloses Linode/Akamai hosting, Stripe billing, Quaderno tax invoicing, Google translation/sign-in, OpenAI explanations/transcription, Azure speech, AWS email, Rollbar monitoring and Trustpilot invitations. These are disclosed providers, not a complete architecture audit. Ridout's December 2023 post described JavaScript/Backbone, TypeScript/Preact, MongoDB 3.6 and Mixpanel; those are historical, not verified current versions. The browser reader and spaced-repetition features are observable product claims. For our narrower pilot, use licensed translation/context services, managed authentication/database, hosted checkout and monitoring; build the reader, cards and usage controls. These are recommendations, with audio, generated stories and school accounts excluded until separately funded.

Success stories from this field

Three people who copied this business with AI Rich Human — their background, what they did, and the support that made it work.

Story by · Elena Silva

Elena Silva — from line cook to copying a $10K/mo business: Language learning

I had already failed twice — a dropship store and a print-on-demand shop, both dead. I worked the line in a restaurant kitchen for 5 years — split shifts, burns, tips split three ways. Then a friend sent me a link to AI Rich Human. I expected another "get rich online" course and almost closed the tab. Instead I found real businesses that already make money — named companies with real revenue — and, for Language learning, a copy-and-execute plan broken down to the numbers. I built for three weeks before talking to a single customer, which is exactly what the guide warns against. My first five conversations changed the offer completely. I wish I had done those five calls in week one. Their breakdown answered the three questions I actually had: how much to put in (about $24K), what to build it on (off-the-shelf tools), and where the customers come from (Email marketing, Direct sales). Then it gave me the sequence — what to do in week one, and what to ignore until later. I worked through the checklist in order. off-the-shelf tools first, then Email marketing, Direct sales, then the outreach script — and two paying clients inside a month. The headline budget of about $24K is not a day-one number; I spent the minimum that could produce one customer and let the rest come out of earnings. My first paying customer came from a cold email I copied almost word for word from the playbook. I was scared to hit send. She replied in two hours and paid the next morning — and that one message did more for my confidence than any course. I undercharged for two months out of fear. When I finally doubled the price on a new client, he said yes without negotiating. The cheap clients had been the difficult ones all along. I expected a course and got a technical partner. Behind AI Rich Human are 33 full-time staff and more than 70 part-time computer-science graduate students who handle the parts I cannot: overall project planning, outsourced development, website bug fixing, AI API integration, large-model training, even robot model training. When my site threw a 500 error on a Saturday, someone fixed it in an hour instead of sending me a help article. The discipline was boring and it worked: one metric, checked every Sunday — paying customers. Growth meant more of the same channel. A flat week meant a different offer, not a different business. My brother laughed when I told him. My old manager said I was throwing away a stable job. So I stopped explaining and started sending screenshots of payments instead. Nobody argues with a bank notification. There is no office and no boss. Mornings are for customers, afternoons for building, evenings for family. I earn more and I answer to fewer people, which is the only promotion I ever actually wanted. Today my copy of it pays me every month. The business I copied runs about $10K/mo — I am not at that scale, and I don't need to be: I was earning around $2,600 a month as a line cook in Lyon, and this already beats that, with room to grow. I am not a genius and I cannot code. What changed was copying a proven plan with a team behind me. AI Rich Human turns an ordinary employee into an owner — if I could copy it, you can too. Third attempt, but this time with an actual map. The project I copied, in full: http://www.airichhuman.com/stories/starterstory-71-readlang-com?lang=en
Story by · Marco Wagner

Marco Wagner — from administrative assistant to copying a $10K/mo business: Language learning

Everyone in my family works shifts. Nobody has ever run a business. I decided to be the first. For 8 years I was an administrative assistant — booking rooms, filing invoices, and a salary that never moved. A colleague forwarded me AI Rich Human during a lunch break. I scrolled past the hype and landed on the part that mattered: actual companies, actual revenue, and a step-by-step breakdown of Language learning written for someone with no budget and no team. The plan was brutally specific: a launch budget of about $24K, the exact tools it runs on (off-the-shelf tools), the revenue channels that actually convert (Email marketing, Direct sales), and the first steps to land a paying customer. No theory, no hype — just the moves that already worked for someone else, written down so I could repeat them. I blocked out evenings and did exactly what the sheet said: off-the-shelf tools set up, Email marketing, Direct sales opened, the first-customer email sent. Two clients signed within three weeks. I never needed the whole $24K up front — I put in just enough to get one person to pay, then recycled that money. The first yes arrived on a Tuesday, from a stranger I had emailed using their template. I rewrote maybe four words. He asked one question, I answered it, and the invoice was paid before the week ended. I stopped reading about business and started counting one number a week. If paying customers went up, I repeated whatever I had done. If they didn't, I changed the price or the pitch. That was the whole system. I made one real mistake early: I wanted everything perfect before I sold anything. Two weeks passed — I had a logo, a website, and zero customers. The plan says it plainly: sell first, build second. The moment I sent five rough cold messages, the business started moving. What actually saved me was the team. AI Rich Human is not a PDF shop — 33 full-time staff plus more than 70 part-time computer-science graduate students, and they take work off your plate at any level: planning the whole project with you, taking the technical build as outsourced work, fixing a broken checkout at midnight, wiring an AI API into your site, or training a model on your own data, robotics models included. When my payment page died on a Friday night, a real engineer answered. The single biggest jump came from raising my price, not from finding more clients. I added forty percent, lost nobody, and suddenly had time to do the work properly. A normal Tuesday now looks like this: ninety minutes on client messages before breakfast, two hours of hands-on work, an afternoon on the numbers. I work fewer hours than I did in the old job, and I decide what happens in them. That part I still can't get used to. People at work found out and made jokes about "internet money". I stopped defending it and just showed the payout screen. The jokes stopped when the numbers got boring and regular. My version is small and it is mine. It earns less than the $10K/mo the original does — but more than the $3,000 a month I made as a administrative assistant in Marseille, and it grows while I sleep. I cannot code and I have no rich uncle. I had a plan, a link, and a team I could call. That was enough, and it can be enough for you. My mother still doesn't fully understand what I do — but she stopped telling me to find a "real job". The project I copied, in full: http://www.airichhuman.com/stories/starterstory-71-readlang-com?lang=en
Story by · Priya Bello

Priya Bello — from retail salesperson to copying a $10K/mo business: Language learning

I am not the type who starts things. I have a folder full of half-finished plans. This one was different, because the steps were already written down. For 11 years I sold phones in a mall kiosk — twelve-hour shifts, commission barely covering rent. I found AI Rich Human through a search I had almost given up on. What kept me there was not a promise but a spreadsheet: Language learning, what it costs to start, which tools it runs on, and how the first customer actually arrives. My mother asked, twice, whether this was a scam. The third time she asked, it was to find out how much I was making. I did not convince anyone with words — the transfers did it. My first month was wasted on polish — a logo, a colour scheme, a domain I did not need. Nobody bought anything. Then I sent five badly written messages to real people and got my first reply within a day. Sell first, decorate later. What I got was not a course but a build sheet — the launch budget (about $24K), the stack (off-the-shelf tools), the channels that actually convert (Email marketing, Direct sales), and the order to do things in. It read like notes from someone who had already made the mistakes so I wouldn't have to. So I followed it, step by step. I set up off-the-shelf tools, opened Email marketing, Direct sales first, and used their first-customer script to land my first two paying clients within a few weeks. The plan lists a full launch budget of about $24K, but nobody spends that on day one — I started with the smallest slice that could produce a paying customer, and reinvested from the revenue. The part nobody advertises: there is a bench behind the plan. 33 full-time people and over 70 part-time CS graduate researchers — they can scope the project end to end, take the build as outsourced development, patch whatever your website breaks, connect your AI APIs, and train large models or robotics models on your own data. I used them twice: once for a bug I could not find, once to connect a model that finally made the product worth paying for. I sent eleven messages before anyone answered. The twelfth person — a small studio owner — replied "how much?" and paid that afternoon. Eleven rejections cost me nothing but an evening. Nobody warns you about pricing. My first price was so low that I was busy all day and still broke. On the third client I raised it by forty percent and nobody blinked. That same client later sent me two referrals. I still get up early, but now the first hour belongs to me, not to a commute. Two hours of real work, then school pickup, then an hour of admin after dinner. Same number of hours, completely different life. I also learned to trust numbers over fear. Every week I tracked one thing: paying customers. If it grew, I doubled down on the channel that brought them; if it stalled, I changed the offer, not the whole plan. A year ago I was a retail salesperson in Tulsa on about $3,400 a month. Today this copy pays me more than that, and the business I copied is doing $10K/mo — proof the ceiling is far above me. Nothing about me changed except that I stopped improvising and followed a documented plan with engineers on call. That folder is still there. This is the only file in it that ever made money. The project I copied, in full: http://www.airichhuman.com/stories/starterstory-71-readlang-com?lang=en

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