Word of the moment
ubiquitous
present everywhere at once
Learning that stays
Gazillions of ways to learn,zero ways to forget.
Work through whole books — read, listen, and answer questions on every chapter — or drill vocabulary with spelling tests and word games. One spaced-repetition engine decides when you see it all again.
7 days free · no card needed
Word of the moment
ubiquitous
Definition
present everywhere at once
From the bookshelf
History Of Orchids: The Familiar Stranger
Chapter 1 · free to read
Learn from books
A whole book,one chapter at a time.
A LexFlexer Book is a short, complete introduction to a single subject — thirty to fifty thousand words, around ten chapters. Pick one and you get the whole thing three ways at once: read it like a book, listen to it like an audiobook, or answer questions as you go and actually keep what you've read.
That last part is the point. Most of us finish a book feeling improved and, a month later, remember a general impression and about four facts. LexFlexer Books fix that — each one quietly works out when to bring the tricky bits back.
A reader that adapts
Four themes including dark, three typefaces including Atkinson Hyperlegible for dyslexic readers, and four page widths from Kindle to full screen.
Tap any paragraph to hear it
Narration follows the highlighted excerpt, from 0.7× to 1.3× speed. Read along, or just listen.
Questions after every chapter
Every question is tied to the exact paragraph it came from — miss one and it hands you straight back to the sentence that answers it, rescheduled by the same spaced-repetition engine as the word tests.
Chapters unlock as you master them
Read a chapter, prove you've got it, and the next one opens up — 90% mastery is the key. A glossary prepares you before each chapter.
Made to be trusted
Facts are audited line by line before you ever see them, numbered citations link every claim to its source, and where the experts genuinely disagree, the book says so rather than picking a side.
On the shelf
Start with a real book.
Think of an Oxford Very Short Introduction crossed with an hour of In Our Time — every book narrated, tested, and cited. The plan is simple and slightly mad: keep writing them until there's one on everything. Ask us in a year how far the shelf has grown. Chapter 1 of every book is free to read, no account required.
Learn vocabulary
One word, testedfrom every angle.
Recognising a word on a flashcard is not the same as knowing it. LexFlexer puts each word through spelling tests, forward and reverse definition matching, and timed word games — so that what sticks is real understanding, not just a vague sense of familiarity.
ubiquitous
Type the word from audio
kaleidoscope
Pick the correct meaning
verdant
Name the word from its meaning
labyrinth
Solve clues from your lists
crescendo
Resurface at the right moment
iridescent
Speed rounds from your word lists
Five games, one source. Crossword, Word Match, Word Search, Word Flip, and Quote Fill are all generated from the list you're studying — never a generic database.
Depth on every word. 40,000+ words with multiple definitions, 10,000+ quotes from real sources, and etymologies that make a word memorable.
Your lists or ours. Start from curated lists organised by age and difficulty, or type in Friday's spelling homework.
On the word shelf
Or start with a ready-made list.
Published word lists for every age and goal — each one a complete course with audio, definitions, and every test mode.
Who it's for
Different goals. Same tool.
Parents & young learners
Build a running list of every word your child is given at school — instead of learning ten words for Friday's test and forgetting them by Monday. New words layer on top of old ones, and supervised mode keeps younger children on track.
Spelling bee competitors
40,000+ words, each with audio pronunciation, multiple definitions, etymologies, synonyms, and antonyms. Build lists pitched at exactly the right difficulty and work through them systematically — the way serious competitors prepare.
Word lovers
Not training for anything — just curious. We surface a new word every day, share stories behind unusual terms on social media, and send a weekly digest by email. Come for one word, stay because you can't stop looking up the next.
Adults sharpening their edge
Our database runs from everyday vocabulary to words that would make a Countdown champion pause. And the book courses go further than words — work through a whole subject, chapter by chapter, and keep what you read.
English as a second language
Clear definitions, native-speaker audio, and real examples for every word. Narrated book chapters double as listening practice — follow the highlighted text while a native speaker reads, at whatever speed suits you.
Spaced repetition
One scheduler remembers everything.
Chapter questions and word tests feed the same scheduler. Miss something and it comes back tomorrow; get it right repeatedly and it waits weeks. Chapters work the same way — 90% mastery opens the next one, and your dashboard shows exactly what's due.