Esperanto

Learn the language built to be learned.

Listen · Read · Repeat · Rate · Fight

You begin with Saluton. Within weeks you're reading it, because nothing is irregular and nothing is hidden.

Word Lists → Lessons →
Esperanto core design

The language that rewards you fastest

La interna ideo — the inner idea.

Esperanto was intentionally and intelligently designed — built to be learnable. There are no irregular verbs, no noun genders, no silent letters, no exceptions waiting to trip you. Every word is spelled as it sounds and every ending means exactly one thing. So the FlashBoss method works almost immediately here: progress is visible week over week, in a way no natural language can match.

And the destination is different. You don't learn Esperanto to survive a trip or consume the media — you learn it to join its people. Core runs from first words and the regular grammar engine, through writing and messaging online, to the thing Esperanto is really for: correspondence, meetups, and a community spread across every continent and no homeland. It's the most welcoming room on earth, and 1,000 words gets you through the door.

Tier 1

Survival words and the regular verb system — the engine, learned once.

Tier 2

Family, feelings, opinions, polite discourse — talking with people.

Tier 3

Devices, the internet, social media, writing online — the modern channels.

Tier 4

Letters, email, sharing news, making plans — real correspondence.

Tier 5

The community, meetups, cultures, the world — belonging, across borders.

Watch it grow up

Progressively more challenging

The example sentences increase in complexity tier by tier.

  1. Saluton, mi nomiĝas Maria.Hello, my name is Maria.
  2. Mi loĝas en granda urbo kun mia familio.I live in a big city with my family.
  3. Hieraŭ mi skribis mesaĝon al amiko en alia lando.Yesterday I wrote a message to a friend in another country.
  4. Kvankam ni neniam renkontiĝis, ni interparolas ĉiusemajne en la reto.Although we've never met, we talk every week online.
  5. Mi esperas partopreni la kongreson, kie homoj el la tuta mondo kunvenas.I hope to take part in the congress, where people from all over the world come together.
Build it from parts

One root, a dozen words

Esperanto has no genders to memorise — so FlashBoss shows you the thing that actually matters: how words are built. Roots stay the same; regular affixes do the rest.

root — the meaning affix & ending — the regular machinery
san-a
healthy — root san- + adjective ending -a
saneco
health — -ec- makes an abstract quality, -o a noun
malsana
ill — mal- reverses any root: the exact opposite
malsanulejo
hospital — ill + -ul- (person) + -ej- (place): a place for ill people
resaniĝi
to recover — re- (again) + -iĝ- (become): to become healthy again

The words of a movement

Esperanto carries its own culture in a handful of words. Tap to flip.

community
samideano
Mi renkontis multajn samideanojn.
a fellow Esperantist — literally “same-idea-person.” What speakers call one another: not a stranger, but someone who shares the idea.
tap to flip
tradition
Pasporta Servo
Mi vojaĝis per Pasporta Servo.
“Passport Service” — a global network where Esperantists host each other for free. A language that gives you a place to stay on every continent.
tap to flip
event
kongreso
La Universala Kongreso okazas ĉiujare.
congress — the yearly world gathering where thousands meet and the only shared language in the room is the one everybody chose.
tap to flip
spirit
interna ideo
La interna ideo unuigas nin.
“the inner idea” — Zamenhof's name for the hope behind the language: people meeting as equals, on neutral ground.
tap to flip

The Pareto Principle

3 packs. 10% of the Esperanto vocabulary for 90% of Esperanto use cases.

Core
A1–A2 · 1,000 words

First words to the community, in five tiers. The road in.

Included free
Pareto 1
B1–B2 · 1,000 words

The next thousand — deeper conversation, writing, and community life.
Pareto 2
B2–C1 · 1,000 words

Abstract, literary, and fluent range. The full three thousand.
How it sticks

Flashcards as an integrated system

Fibonacci SRS
Rate each card 0–5. The better you know a word, the longer before it returns — spaced repetition on Fibonacci intervals.
Boss fights
Each cluster is gated by a duel you can't win without confronting and overcoming your most difficult words.
Graduation
Beat a cluster and its cards leave your daily deck for good. The deck gets smaller as you learn.
Regularity
Because Esperanto is perfectly regular, every word you learn multiplies — affixes turn one root into a dozen words you can already read.
Lessons
Reference lessons fire at the point in the sequence where they unlock what you're about to read.
Get FlashBoss on Steam →