Read when you can. Listen when you can't. Pick a book with a friend and watch each other's chapters tick up. Tandem keeps it all in sync — on the web, iPhone, iPad, Mac, and Vision Pro.
Free in any modern browser. Free on iPhone, iPad, Mac, and Vision Pro. Sign in with Apple — across all of them.
How it works
Step 1
Drop in any EPUB and a matching audiobook — M4B, MP3, or multi-file. Tandem matches them by filename and pairs them automatically. Works with textbooks, novels, language materials, anything.
Step 2
Swipe or tap to switch — the audio picks up the exact sentence you were reading. Swipe back, and the page scrolls right there. Every word highlights in real time so you can follow along.
Step 3
Don't have the audiobook? Tandem reads any ebook aloud with a natural AI voice — and the sync still works. Highlight passages, search text, control playback from your lock screen.
Read it, listen to it, switch in the middle of a sentence. Tandem holds your place wherever you are.
No install. No account. A page that actually looks like a page — paper-warm, set in Newsreader, with a drop cap on the first chapter. Three classics waiting. Click the right side to turn, the left to go back. We'll keep your place.
Start reading →Hit the headphones in the corner. The audiobook picks up the exact sentence you were reading. Drive across town. Walk the dog. Sit back down, the page is waiting. Bring your own EPUBs and M4Bs — no bookstore lock-in. On iPhone, iPad, Mac, and Vision Pro.
Get the app →Book Clubs
Start a club for your group chat. Share an invite code that's six bytes of hex. See where everyone is in the book in real time. Underline a passage and your friends see the highlight in their feed. Reply with a note. Keep reading.
Same account on web, iPhone, iPad, Mac, and Vision Pro — make a club from the web, your friend joins from the iPhone app, the conversation lives in one place.
Recent activity
Some of us learn best by reading. Some by listening. Most of us need both — depending on the moment.
Students following along with a textbook. Commuters switching between eyes and ears. Language learners hearing the words they're reading. Parents sharing a story with their kids.
Tandem meets you where you are.
Import DRM-free EPUB and M4B or MP3 audiobooks. No bookstore lock-in.
No audiobook? Tandem reads any ebook with a natural AI voice.
Highlight in any color. Add notes. Browse them from the menu.
Find any word across every chapter. Tap a result to jump there.
Play, pause, skip from Control Center, lock screen, or AirPods.
Every time someone corrects the sync, it improves for everyone.
See time spent reading and listening each day. Build a streak and watch your habits grow.
Highlight a passage and share a beautiful quote card. Perfect for social posts and book clubs.
Sign in with Apple or email to sync progress, highlights, and notes across iPhone, iPad, Mac, Vision Pro, and the web — every save, not just on launch.
Pick a book together. See each member's chapter on the club page. Comment in-context. Same accounts across web, iPhone, and iPad.
Three classics ready to read at tandembooks.co/app/ — no install, no signup, paginated like an actual book.
Read in your browser today. Sign in to sync. Get the app for offline + audiobook handoff.