Here's what happens between ‘Start free’ and ‘I finally get it’, in plain words. A coach that checks your level, plans your day, points to the exact sentence to fix, and brings in a person when it isn't sure.
An IELTS essay, a work presentation, a school paragraph: every lesson in Lumen runs the same four moves, so you always know what's coming and why.
1
Check your level
A quick diagnostic estimates each skill and says how sure it is. Your plan starts from where you really are.
2
Practice
Your daily plan mixes today's work, a little catch-up and one stretch task. Write or speak at any hour, on any device, with nobody watching.
3
Get feedback
A practice estimate, the exact sentence that cost you the point, and one drill to fix the biggest problem first.
4
Review and prove it
Weak skills come back right before you'd forget them. Then a fresh task checks that the fix held, because a skill only counts when it works again, later, somewhere new.
Feedback
Feedback, up close.
Not a number and a ‘good job’. Here's what comes back after you write or speak.
Writing
The sentence that cost you the point
On the IELTS track, a practice band estimate for each of the four criteria: task response, coherence, vocabulary and grammar.
The exact sentences each judgment rests on, quoted back to you, so you never have to guess what went wrong.
One repair drill for the biggest problem. Fix that first, then the next.
Every band you see is a practice estimate, not a test score.
Speaking
What a listener actually heard
Tap record on your phone or laptop. No setup, and nobody watching.
Your transcript: what a listener heard, word for word.
Your pacing: where you paused and how fast you went.
A pronunciation drill with model audio. Shadow the reference, record again and compare.
Your accent is yours. We coach clarity, never accent.
Your plan
A plan that knows what to do next.
You never have to decide what to study. Lumen keeps a running picture of every skill and updates it every time you write or speak.
01 / Diagnostic
Start where you really are
A quick diagnostic estimates each skill and shows a confidence range. It tells you how sure it is, so your first week goes on the right things.
02 / Daily plan
Today, catch-up, stretch
Each day mixes the work you're on now, a catch-up on something that slipped, and one stretch task a little beyond you. Open it at any hour, on any device.
03 / Review
Review before you forget
Weak skills come back for review right before you'd forget them, not weeks later when you're starting over.
04 / Proof
Prove it stuck
A transfer check hands you a fresh task in a new context. When the skill works there, it counts. Your progress dashboard keeps the whole picture in one place.
Human review
Humans check the hard calls.
An AI coach is fast and patient. It isn't always sure. When it isn't, a person steps in.
Honest AIWhen it isn't sure, it says soIf the AI can't judge your work with confidence, it says so instead of guessing, and your work goes to a trained reviewer.Trained reviewersReal people, reviewing blindReviewers are trained and calibrated against each other, and they review blind: they see your work without the AI's estimate, so nothing nudges their judgment.AppealsDisagree? Ask for another lookIf a result feels wrong, you can appeal it and a person will take another look. That's the deal: honest estimates, and a way to question them.
Families and schools
Safe for every age.
Kids, teens, adults and professionals share one coach, so safety is built in from the start, not added later.
Child-safe modeNo open-ended chat for kidsKids and teens get a child-safe mode with no open-ended chat: the coach sticks to the lesson. A parent can send a family code to start right away, and for children under 13 a guardian gives consent before anything starts. Either way, the guardian view is read-only: progress, streaks and due reviews, never their writing.SchoolsTeacher and school seats, by invitationSchools join through invite-only pilots, with teacher and school seats, an organization dashboard and seat-based billing. Every pilot starts with a conversation, a safety review and a written agreement, so your school stays in control.Your dataUsed to coach you, nothing elseNo advertising trackers. Your writing and recordings are used to coach you and nothing else. Export or delete your data whenever you ask.
Early accessHonest about what's readyLumen is in early access. Lessons and feedback are still being refined, some packs are invite-only or still filling up, and we'll always say what's ready. No band or score promises: what you get out depends on the practice you put in.
Free to start
Ready when you are.
Start free with one writing task a day, plus a daily speaking attempt and pronunciation drill. Upgrade when it helps. One-time purchases can be refunded within 14 days.
IELTS is a registered trademark of the British Council, IDP: IELTS Australia and Cambridge University Press & Assessment. Lumen is an independent preparation product and is not affiliated with, endorsed by, or approved by the IELTS partners. Band estimates are estimates, not official scores.