Featured by Apple on the App Store

A reading app that helps you learn a language by yourself.

Book by book, you go from looking up every other word to reading whole pages without stopping.

30-day Premium trialBooks in 45 languagesTranslation in 134 languages
A page of The Great Gatsby in Spanish in Simply Fluent, with saved English translations shown above the text
Try it here

Read this page. In Spanish.

This is the same reader as in the app. Select a word you don't know and save its translation. Then turn to the next page and look for that word.

Pick a language

Books in 45 languages

The library has books in each of the languages listed below. Translation works in 134 languages, so you can also import your own books in languages that have no library books. See the full list of languages.

  • Arabic
  • Bengali
  • Bulgarian
  • Chinese (Simplified)
  • Chinese (Traditional)
  • Croatian
  • Czech
  • Danish
  • Dutch
  • English
  • Estonian
  • Finnish
  • French
  • German
  • Greek
  • Hebrew
  • Hindi
  • Hungarian
  • Indonesian
  • Italian
  • Japanese
  • Korean
  • Kurdish (Sorani)
  • Lithuanian
  • Luxembourgish
  • Malay
  • Norwegian
  • Persian
  • Polish
  • Portuguese
  • Portuguese (Brazil)
  • Romanian
  • Russian
  • Serbian
  • Slovak
  • Slovenian
  • Spanish
  • Swahili
  • Swedish
  • Tagalog (Filipino)
  • Thai
  • Turkish
  • Ukrainian
  • Urdu
  • Vietnamese
Page 1 of 2
Capítulo 1

El último tranvía

El tren llegó a la ciudad poco después del amanecer. Clara bajó al andén con una maleta pequeña y un libro viejo bajo el brazo. No conocía a nadie, pero no tenía miedo.

Compró un café en la estación y se sentó junto a la ventana. Afuera, la ciudad empezaba a despertar: una persiana que subía, un tranvía, dos vecinos que discutían sobre el tiempo. De repente se dio cuenta de que entendía casi todo lo que decían.

Before you start

Things you might be telling yourself.

"It's too hard to read in the language I'm learning."

The meaning is on the same page.

Select a word or phrase you don't know and you get all its meanings, with the one that fits the sentence highlighted. You don't leave the book, and you don't have to guess which meaning is right.

"I have to start with children's books."

Start with a story you would choose anyway.

Bring your own book, or pick a short story or a full-length classic at your level.

"I don't have time to sit down and read."

Listen, and follow along on the page.

Any book can be read aloud with your phone's own voice, including the ones you add yourself, at the speed you choose and without a connection. Turn on Pages follow the audio and reading continues on the next page, so you can listen on the bus and keep your place.

"I can't learn a language on my own."

Reading on your own counts.

Translations you save come back as flashcards. Your stats show the words you have read, the translations you have saved and memorized, and the hours behind them. Streaks are there if you want them.

The research

Why reading works.

Researchers have measured how many words it takes to read a book, and how people learn them. Here is what they found, and where Simply Fluent fits in.

Nation, 2006 · Milton, 2006 and 2013
9,000word families, roughly, to read a novel without help

A word family is a word with its related forms, like read, reader and reading. UK school learners of French finish their GCSE knowing fewer than 1,000 French words, and finish A-level with about 2,000.

Vocabulary, drawn to scale
UK school French, GCSE
under 1,000
UK exam syllabus at B1
about 1,000
UK school French, A-level
about 2,000
A novel, read without help
8,000 to 9,000

School figures count single words. A word family holds one or more of them, so the real gap is wider than the chart shows.

Hu & Nation, 2000

The 98% rule.

Adult learners read a short story in which some words had been replaced with words they couldn't know. The more of the story's words a group knew, the more readers in that group understood the story.

100%0
15 of 17 readers
95%15
6 of 17 readers
90%30
4 of 16 readers
80%60
0 of 16 readers

Each group had 16 or 17 readers, and understanding meant getting at least 12 of 14 questions about the story right. A page is counted as 300 words. The researchers estimate that reading without help starts at about 98%: around 6 unknown words on a page.

A reader who knows the 2,000 most common word families knows about 88% of the words in a novel, which leaves more than 30 unknown words on every page.

Hulstijn, Hollander & Greidanus, 1996

You don't have to wait for 98%.

In one study, learners reading a story remembered more new words when the meaning was printed beside the word than when they had a dictionary or no help.

In Simply Fluent, you translate a word or phrase you don't know and see the meaning it has in that sentence. Save the translation, and it is shown above that word or phrase every time it comes back, in every book you read in that language, so a page with 30 unknown words is one you can still read.

Nation, 2014

Every book makes the next one easier.

The common words come back on every page, so you meet them again and again in your first books. Rarer words take more reading. Paul Nation estimated how many novels it takes to meet each word at least 12 times, one band of 1,000 word families at a time.

Novels to meet each word 12 times
22nd
33rd
64th
95th
136th
167th
208th
259th

Each bar is one band of 1,000 word families, from the 2nd thousand most common to the 9th.

A word you learn in one book is a word you know in every book after it, so the next book has fewer unknown words on each page. By Nation's figures, reading an hour and 40 minutes a day, five days a week, at 150 words a minute, adds up to about 3 million words in 40 weeks: enough to meet the 9th thousand words 12 times each.

Elley et al., 1996 · Elley, 1997

Classes that read storybooks improved twice as fast.

In rural Fiji, primary schools learning English were given 250 storybooks each. Children aged about 9 to 11 read them in class, in place of part of the usual English course, with no extra time spent on English.

Reading comprehension gained in 8 months
15 monthsWith storybooks
6.5 monthsWith the usual course

Year 4 pupils. After two years, vocabulary scores in the storybook schools were about 10% higher.

Nation, I.S.P. (2006). How large a vocabulary is needed for reading and listening? Canadian Modern Language Review, 63(1). Milton, J. (2006). Language Lite? Learning French vocabulary in school. Journal of French Language Studies, 16(2). Milton, J. (2013). Measuring the contribution of vocabulary knowledge to proficiency in the four skills. EUROSLA Monographs, 2. Hu, M. & Nation, P. (2000). Unknown vocabulary density and reading comprehension. Reading in a Foreign Language, 13(1). Hulstijn, J., Hollander, M. & Greidanus, T. (1996). Incidental vocabulary learning by advanced foreign language students. The Modern Language Journal, 80(3). Nation, P. (2014). How much input do you need to learn the most frequent 9,000 words? Reading in a Foreign Language, 26(2). Elley, W., Cutting, B., Mangubhai, F. & Hugo, C. (1996). Lifting Literacy Levels with Story Books. Elley, W. (1997). In Praise of Incidental Learning.

Why Simply Fluent exists
“I started building Simply Fluent in 2018, because I wanted to read a book in Dutch. I stopped having time to learn Dutch, but I would read a few pages every night to test the app. Then one day everyone around me was speaking Dutch, and I understood almost all of it, just from reading.”
229hreading in Spanish
150hreading in Portuguese
26hfor Marco's first Portuguese book, 300,000 words
Marco, who built Simply Fluent
Marco Ivarsson, founder of Simply FluentMarco's story
Store reviews

What readers say.

Five-star reviews from the App Store and Google Play, as they were written.

I come from the streak land of Duolingo, but felt like I hit a plateau in learning and then your goal is just the streak as opposed to learning. With SimplyFluent you become more invested in learning since you’re trying to understand a story. The dictionary is a great to build your exposure to the words you don’t know. Definitely recommend this app.
Sleepy S1App Store, United States, October 2026
I love reading. That’s how I became fluent in english and french. I’m currently learning german and needed a tool to help me translate my german books in french without having to use a dictionary or a translating app. I love how the words you save are getting memorized so that when you come upon one the translation is already there and you understand easily. This is the first time that I pay for an app ever because it simply deserves it. You can also import your own books and read them.
Yazzminn’App Store, France, December 2025
This is a great application for improving both reading level in a language, and with text to speech can also be used to improve one's ear for the language. of course vocabulary as well. They reached out to me for feedback and personally helped me with some issues I was having, which was a very positive experience.
RyanGoogle Play, September 2025
Simply Fluent makes learning through reading incredibly easy and enjoyable. I especially love that the books are organised by language level, as finding the right books when starting a new language is usually frustrating, but this app removes that problem completely. The whole experience feels very smooth and intuitive. The daily challenges helped me to build a consistent learning habit. Highly recommended for anyone learning/wanting to learn a new language!
Geels 88App Store, United Kingdom, March 2026
I’ve started using simply fluent and what can I say, it’s simply effective. Reading helps me keep my Spanish while simultaneously learning new vocabulary and I absolutely love it. 10/10 recommend!
anki-crApp Store, Germany, November 2025
I have been learning languages ever since I can remember and speak 3 fluently. Simply Fluent is clearly the best I tried so far - reading is the best way to fully embrace any new language and the UX is designed in a way that makes it really pleasant to go back regularly.
omsg813App Store, France, December 2025
I’ve been using this app for a few weeks now and it is great.I love reading and I’m also learning Spanish so it’s the perfect combo. You can translate words you don’t know and then memorise them later with a flash card game. Highly recommend
Mary longworthApp Store, Ireland, December 2025
I love the way this app works, so easy to read and translate new words into any language!
Serhii HrynApp Store, Philippines, May 2026
Pricing

Try Premium for 30 days.

Start the 30-day Premium trial on this website or in the app. To use the free version, download the app and choose it during setup. Cancel the trial before it ends and you aren't charged.

Premium
€59.99 a year€5.00 a month, billed once a year, after 30 free days.
  • Unlimited translations and insights
  • Import your own books, as many as you likeEPUB, PDF, TXT, Markdown or pasted text
  • Translate up to 15 words at once
Start your 30 days
Questions

Before you download.

Can I use Simply Fluent if I am just starting out?

Yes. Free flashcard decks help you learn the first 100 words of a language, so you can start before you can read a page. For English speakers they cover French, Spanish, Portuguese, Dutch, German, Italian, Hebrew and Russian, and more languages are being added. If the language uses an alphabet you don't know yet, a free course helps you learn the letters for Hebrew, Russian, Greek, Ukrainian and Korean. After that, start with the short stories in the library.

Which languages can I read in?

The library has books and short stories in 45 languages, from Arabic to Vietnamese. Translation works in 134 languages, so you can read your own books in 89 more. See every language.

Can I read my own books?

Yes. Add EPUB, TXT or Markdown files, or paste in text. PDF needs Premium. Books with copy protection (DRM) can't be added. The free plan includes one book of your own in total, and Premium has no limit.

Can I read a story written for me?

Yes. The app gives you instructions to send to ChatGPT, Claude or another assistant. The assistant asks what the story should be about, which language, how hard and how long, then writes it as a file. Import the file, or paste the text, and read it like any other book.

What happens after the 30 days?

If you keep the subscription, your chosen monthly or yearly plan begins at the price shown. If you cancel the trial before it ends, you aren't charged. You can keep reading in the app on the free version, with every saved translation, flashcard and statistic intact. New translations and insights use your one-time allowance of 150 lookups. Trial lookups don't use it.

Can I read offline?

Yes. A book you have opened stays on your phone, and your saved translations are shown without a connection. Translating something new needs a connection, so choose Look up later in the translation card. When you're back online and open Home, the app translates everything you marked Look up later, and you choose which translations to keep.

All questions

Start a book tonight.

Books in 45 languages, and 30 days of Premium for everyone.

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