Learn any language.
One word at a time.

A refreshingly simple approach to language learning. No complicated lessons, no overwhelming grammar dumps, no subscription fees.

Download the app Get the book

The app

Available on iOS

One word. Every day.

toki suli delivers carefully crafted daily lessons that build your vocabulary and grammar knowledge gradually over six months.

Available languages

  • toki pona — Free starter course (137 lessons)
  • French — 180 essential lessons
  • German — 180 lessons with clear grammar
  • Italian — 180 lessons for la dolce vita
  • Irish — 180 lessons in An Caighdeán Oifigiúil
Download on the App Store

Why one word a day works

●

Sustainable

A few minutes daily beats hours of cramming

●

Memorable

Deep focus on one concept means it sticks

●

Achievable

Visible progress keeps you motivated

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Flexible

Learn at your own pace, review anytime

  • Daily lessons with rich explanations
  • Pronunciation guides
  • Searchable word list
  • Quiz mode to test yourself
  • Progress tracking
  • Daily reminders
  • Offline access
  • Privacy focused — no accounts, no tracking, no ads
  • One-time purchase — buy a language, keep it forever

The book

Available on Amazon

toki suli: Learn toki pona, one word at a time

A 137-day journey into the world's simplest language

toki pona is a minimalist constructed language with only 137 words. Created by linguist Sonja Lang, it's designed around simplicity and positive thinking.

In this book, you'll learn every single word — one per day, with clear explanations, example sentences, and progressive grammar lessons.

What's inside

  • 137 daily lessons with meanings and examples
  • Progressive grammar introduction
  • Complete vocabulary (pu and ku words)
  • Pronunciation guide
  • Quick reference word list
  • Grammar summary
  • Useful phrases

toki pona li pona. — The simple language is good.

Buy on Amazon

Available as Kindle ebook and paperback