LearnFast — stay 85% challenged, in any language

Language

How much do you know?

Lesson

💬 Free conversation — graded to keep you ~85% challenged.

🎙️

Hit Start voice call and just talk.

It's a real back-and-forth — no push-to-talk. A complete beginner is spoken to in English and taught from word one; the tutor mixes in your language and weans you off English as you improve. Don't know a word? Say it in English and it'll teach you.

🚀

The tutor

The 85% gauge

Two dials — difficulty + how much English the tutor uses — hold you near the 85% sweet spot where learning is fastest (Wilson et al., 2019).

target 85%

85%

comprehension

3/10

difficulty

85%

English support—

Start a call — I read your level from my own traces and hold you near 85%.

Behind the scenes

The Arize Phoenix loop: every turn is traced, the agent reads its own traces to adapt, and a supervisor AI watches the tutor.

Difficulty decision—

Comprehension—

Producing the language—

Backup teacher—

The backup teacher's notes & trace reads appear here.

Welcome to LearnFast