Read · Learn ·
Remember
Cultivate your vocabulary and read alongside friends. Tilia turns reading from a passive pastime into an active, social growth engine — every word you meet, quietly remembered.
How Tilia works
A seamless bridge between discovery and mastery.
1. Read anything
Bring your own EPUBs, PDFs, and text files, or start with a classic from the built-in library. The reader is clean, distraction-free, and made for long sittings.
2. The hard words surface
Tilia knows which words sit above your level and turns exactly those into flashcards — each one carrying the sentence you met it in.
3. Master & track
Spaced repetition turns a temporary highlight into permanent knowledge, and your word count climbs with every book you finish.
Know your number.
Stop guessing. Tilia’s adaptive test narrows in on how many English words you actually know — about three minutes, simple yes / no answers, and a real confidence range at the end.
It adapts as you answer
Each question is chosen to learn the most from your answer, so the test stops as soon as it is confident — usually around 25 words in.
A range, not a vanity number
You get an estimate with its confidence range — and that estimate personalizes every book, so Tilia only surfaces words you genuinely don’t know yet.
Better together.
Reading is better with company. Start a co-read, send an invite link, and move through the same book with a friend or a whole book club — each of you building your own vocabulary from the same pages.
Reading sessions
Set a finish date, invite your people, and watch each other’s progress as the pages go by.
Highlights that talk back
Share a passage into the co-read and reply to each other right where it happens, in the pages.
Your next book is also
your next 200 words.
No credit card required. Two books, the vocabulary test, and every flashcard are free.