Uben is a free online spaced repetition learning platform that helps you master any subject. Create custom flashcard decks, import decks from Anki, and study languages, sciences, coding, history, and more with smart review scheduling.

What subjects can I learn with Uben?

Uben supports learning any subject through spaced repetition. You can create custom decks for languages, sciences, coding, history, mathematics, and more. Anki import is available for Arabic, Chinese, English, French, German, Hebrew, Japanese, Korean, Russian, Spanish, Hindi, Turkish, and other languages.

How does spaced repetition work in Uben?

Uben uses intelligent spaced repetition algorithms to optimize your learning. Cards are shown at increasing intervals based on your performance, helping you remember information more efficiently. The system tracks your progress across all devices.

Can I import my existing Anki decks?

Yes! Uben supports importing Anki decks (.apkg files) for 10+ languages. You can also export your decks to KAnki format for studying on jailbroken Kindle devices.

Yes, Uben is completely free. There are no paid tiers or subscription fees. All features including custom deck creation, Anki import, progress tracking, and community marketplace are available at no cost.

KAnki: Study Flashcards on Your Kindle (Jailbroken) — Complete Guide

Published on 2026-06-24 • 7 min read • Tools & Workflows

Turn your e-reader into a distraction-free flashcard machine. Here is how KAnki works, what it needs, and how to export decks from Uben for offline Kindle study.

What Is KAnki?

KAnki is a flashcard application that runs on jailbroken Kindle devices. It brings spaced repetition to the e-ink screen — no notifications, no other apps, just your cards and a battery that lasts weeks. For many learners, the e-ink display is the perfect distraction-free study environment, especially for vocabulary review before bed or on commutes.

The Old Way: Manual Configuration

KAnki reads a JavaScript config file (kanki_config.js) that literally lists every card. In the past, users typed these configs by hand — a painful, error-prone process that limited KAnki to a tiny audience of dedicated tinkerers.

The Modern Workflow: Uben + KAnki

Uben turns KAnki setup into a three-step flow: import an Anki deck (or build your own), edit the cards in Uben's interface, then export a ready-to-use kanki_config.js. No manual typing, no syntax errors, and support for any language or subject. You can even share your config with the community on the KAnki community page.

What You Need to Get Started

You need a compatible jailbroken Kindle with KAnki installed, plus a Uben account (free). Import your deck, review and clean up the cards, hit export, and copy the generated config to your Kindle. If you are part of a study community, browse shared configs to find decks other learners have already prepared.