You Read, Digest and Get Insight.

Readest is a free, open-source EPUB and PDF reader designed for deep, immersive reading. Enjoy highlights, notes, split-screen reading, text-to-speech, and cloud sync across macOS, Windows, Linux, Android, iOS, the Web, KOReader and CrossPoint devices.

or choose your platform

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Parallel Read,
Side by Side.

Compare texts, translations, or ideas with Parallel Read, our split-screen book reader. Read two ebooks or documents side by side — perfect for researchers, students, language learners, and anyone who reads more than one book at a time.

Read books
in style.

Personalize your reading experience with customizable themes, fonts, and colors. Whether you prefer light mode, dark mode, or a sepia tone, Readest adapts to your eyes and environment for comfortable, distraction-free reading.

Break barriers with
effortless understanding.

Instantly translate paragraphs with DeepL integration or look up terms on Wikipedia — right inside your book. Readest's built-in translation and lookup tools make it the ideal ebook reader for multilingual readers and curious minds.

Refine Your Reading Experience

Explore a powerful EPUB and PDF reader packed with features for curious, passionate readers — from annotations to text-to-speech and cross-device sync.

Parallel Read

Read two books side by side in split-screen view with synchronized scrolling and navigation.

Reading Essentials

Highlight passages, bookmark pages, take notes, and search across your entire ebook library.

Customization

Adjust fonts, margins, line spacing, and theme colors for a comfortable, personalized reading experience.

Smart Tools

Look up words, translate text with DeepL, and browse Wikipedia — all without leaving your book.

Cross-Platform Sync

Pick up where you left off on any device. Your highlights, notes, and reading progress sync automatically.

Read Aloud

Listen to any ebook with AI-powered text-to-speech (TTS). Turn your reading into an audiobook experience.

In readers' own words

Real reviews from people who read with Readest, quoted as written.

Learning new languages

Trying to use this app to read books in new languages. I am taking advantage of the highlight to read aloud function. Having each paragraph auto translated is very helpful. However, I wish that there was a way to have the TTS play at the same time as the translation. I want to hit a word and hear the pronunciation and see the translation at the same time. This would save me so much time. Edit: I decided since the app is open source, I can just add the feature myself. And I did! 5/5 stars!

Google PlayNov 3, 2026

Four devices, four operating systems

Syncing across 4 devices with 4 different OS's. Initially meant as a way to keep reading on my X3 after purchasing a Viwoods Aipaper Reader C but it has now evolved into an ecosystem 😄 … Via this plugin the X3 with Crosspoint is synced with Readest. Meaning I can read my book on the X3 on then on the Viwoods (Android), iPhone (IOS) and Macbook (OSX) with the dedicated app or the webinterface.

RedditNov 6, 2026

Reading with ADHD

… As someone who struggles to read due to ADHD the app’s text to speech feature is an absolute lifesaver! I can listen to a book while getting stuff done or playing games. While the TTS voices aren’t expressive like audiobooks they don’t sound robotic either and you can even choose from a variety of different speeds for it to read it to you. … I have been using this app daily and I believe it deserves a lot more praise! …

App StoreJun 26, 2025

Swapping social media for books

Best free reading app ever. Finally replaced my dopamine spikes from social media with reading. Synchronization is very easy to setup and costs nothing to have up to 500 MB synchronized. If you ever need more there are subscription and even lifetime options that are both priced incredibly generously. Thank you devs! You are the best!!!

Google PlayFeb 20, 2026

Customizing everything

I want to control everything about my reading experience, down to whether or not the text is hyphenated when it is wrapped to the next line, the line spacing, and information at the bottom of my screen. And this somehow does all of this, and more, like importing font files and dictionary files! Finally, it does not randomly offload books to the cloud, which Apple Books does every single time.

App StoreJun 12, 2026

Reading across devices

Hands down one of the best readers I've used over the years. It's a no brainer if you like to read across multiple devices; I use it to sync my progress between my phone, tablet, and e-ink reader. Started using it for novels and then it became my reader of choice for academic and reference books too, it's just too comfortable. I'm not interested in any of the optional AI features so I purchased some lifetime storage to support the project instead.

Google PlaySep 7, 2026

KOReader sync

I love using alternate software on my Kindle. The only stock feature I missed was the ability to pick up where I left off on my phone later on. With the new update, this app finally gives back the same functionality. It took me some trial and error to get matching files to the app, but now it works without a second thought. I can’t overstate my gratitude to the dev team for making such great software—the fact that its open source is even better. …

App StoreAug 16, 2025

Open source for the long run

… Having tried dozens since the introduction of the iPad (including Marvin, Kybook, Book Fusion, Pocketbook, & Apple), READEST tops them all. … And because it's open-source, it doesn't have the same risk of it being abandoned by developers, which typically leaves users stranded. …

App StoreSep 6, 2026

Fits the tools you already use

I've used a LOT of reading applications over the years and am pretty annoyingly picky about them. I want them to be both frictionless to open and start reading, while also being feature rich and cross platform. This is my all time favorite reading app by a wide margin. KOreader sync support, mobile apps across platforms (and the web!) to sync your library and reading location, OPDS support, audiobookshelf support, the ability to sync notes and highlights to notion... Incredible stuff.

Google PlaySep 8, 2026

Staying focused

perfect reader! though i already use elevenreader as a "audiobook" while reading, i appreciate the built in TTS. the main thing i love here though is the ability to auto scroll while the ruler is on and dimming the words outside the ruler. it's helped me focus on reading a lot. :)

Google PlayJul 14, 2026

Falling back in love with reading

The BEST e-reader app that I've found 📚🤍 It has cloud syncing, tons of customization options, beautiful design and the sync with Notion and Hardcover are honestly life-changing (no exaggeration) 😭🙏🏻 It has all the essential features I need and it makes my reading experience so smooth, distraction-free, and enjoyable that I've fallen in love with reading again ✨️ Thank you so much to the developers and everyone behind this app 🥹💘

Google PlayOct 18, 2026

For visually impaired readers

The usefulness of this app cannot be understated. It is the absolute best app in its category that does not require a subscription. It’s a godsend for the visually impaired.

App StoreOct 20, 2025