STUDY WITH FRIENDS

Study with friends. Duel on your own notes.

Send a link and a friend fights you on the questions of your own book or notes: same question, 30 seconds each, first to zero loses. No host needed.

Challenge a friendTry a duel

Free to start · friends join free · any PDF or EPUB · no credit card

A duel, in thirty seconds

Here a character stands in for your friend. Pick an answer, lock it in, and watch the round.

Loading the demo world…

Tap an answer, then Lock in. Your progress moves to your account when you sign up.

How a study session becomes a match

One world, one link, and the questions do the rest.

01

Pick a world

Your own upload, or a public book world you both know. Every question in the duel comes from it, so winning means knowing the material.

02

Send the link

An invite link opens the duel to a friend, who signs up free if they have no account; a classmate can be challenged straight from the lobby.

03

Answer, strike, repeat

Both see the same question with 30 seconds to answer. One right answer strikes for 20; two wrong ones cost 10 each. From 100 HP, first to zero loses.

Duels, races and classrooms

A duel for two, a race for six, a classroom for the whole group, and practice in between.

Duels

One on one, turn by turn: the attacker strikes with a right answer, the defender counters with one, and both stumble when both are wrong. Rematch when it is over.

Races

Up to 6 cars on a 1 km track: every right answer adds 10 km/h, every wrong one takes it away, and a leader who stops answering gets caught.

Classrooms

A teacher, a tutor or the organised friend shares the worlds with a group; everyone plays with their own progress, and the members list shows who is ahead.

Practice between matches

A quick match against one of the world’s characters, on easy, normal or hard, for the evenings when nobody is online.

When another tool fits better

Three cases where you want something else.

Thirty people on a projector

A duel is two players and a race is six, each on their own screen. A live quiz for a whole room, with a host and a projector, is another tool.

Different books

Both players fight on one world, so you need the same upload or a public book you both have. Two people on two textbooks cannot duel.

Voice or video

There is no chat or call built in. Open your usual call next to it; the duel only needs the browser or the app.

Built on real books

Live numbers, straight from the database.

27
public worlds you can play now
2
languages
3,462
characters to battle
21,806
questions written so far

Questions

Can I quiz my friends online without a teacher?
Yes. Open the Duel in any world, create an invite link and send it; nobody hosts, and the questions come from the world itself. A friend without an account signs up free and lands in the duel.
How do I invite a friend?
From the Multiplayer section of a world: Duel, then Create a link, then send it however you like. On one of your private worlds the link also lets the friend in, so they can keep playing it on their own afterwards. Classmates in a shared classroom can be challenged directly, with no link.
Do my friends need to pay?
No. Joining a duel or a race is free. On a premium world a free player fights on its free maps, and the duel uses those questions for both of you.
Is there a one-on-one study app?
This one: duels are one on one, in the browser and in the Android app, on the questions of any book or notes you upload. Races take up to six, and a quick match against a character works alone.
Can a whole class play together?
In a classroom, yes: up to 200 members share the same worlds, duel in pairs and race in groups of up to 6, and the teacher follows everyone from the members list. Students join free.
Is it free?
Playing is free: the public worlds cost nothing and never expire, and every premium world has a preview (5 battles, 10 Tower Climb questions and 10 mini-game questions, plus the flashcards of its first maps). Your own book takes a book-to-game credit; Lifetime Pro is one payment that includes 3 book-to-game credits and opens every world in full. No subscription.

See also

PDF to gamePDF to quizPDF to flashcardsBook to quizActive recall gamesTurn studying into a gameHomeschoolFor teachers

Free to start

Play the free worlds for as long as you like. Pay once when you want your own books in.

Free
$0
No card, no time limit
  • Unlimited play on free public worlds
  • A taste of premium worlds: 5 battles, 10 tower questions and 10 mini-game questions each
  • Live duels with friends, classmates or the computer
  • All five modes, on any device
  • Progress saved to your account
Start free
LIMITED LAUNCH DEAL
Lifetime Pro
Regular price $49.99, launch price $19.90

Launch price for the first 100 buyers or until 31 Dec 2026, then $49.99. 97 of 100 left.

One-time payment, keep it forever
  • Turn your own notes into games (3 book-to-game credits)
  • Unlimited battles on every world
  • Unlimited mini-game questions on every world
  • Duels on every map of every premium world
  • Every premium world, every map, all five modes
  • Your own flashcards in any world (up to 200)
  • Study timer extras: room themes, window views, pets and focus insights
  • Classrooms: share the worlds you generate with your students, who join free
  • All future updates included
Get Lifetime Pro · $19.90

Need more later? Extra book-to-game credits are $4.00 each, 5% off from 3, 10% off from 5 and 20% off from 10.

Studying is better with someone to beat.

Upload the material, send one link, fight.

Challenge a friend