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From real classrooms

What teachers say.

NNoaJapanese teacher · @genoa_nopi_japanese

I'd been looking for these features for a couple of years. I'd built parts of this myself, but never to the level KOKU offers. I feel closer to my students now, and honestly, I feel like a better teacher.

AAkioFrench teacher

Honestly, I was so excited for KOKU's launch, and I can't recommend it enough. As an online teacher, it's a real time saver. I can track all my students and see where they're heading. It improves my teaching overall.

DDuarteEnglish teacher

KOKU takes my lessons to a whole new level. All my students love the platform. They can't wait for their recaps and to see their progress in English with me. If you haven't tried KOKU yet, you have no idea how much time you could be saving.

Across every lesson

Know where each student is heading.

Lesson Studio reads all of a student's lessons together: their level, the mistakes that keep coming up, what's improving, and what to do next.

koku-library.app · your student

Where Lucas is heading

From 4 lessons · updates after each lesson

A1A2B1B2C1C2

B1, moving toward B2

Lucas is progressing toward confidently handling job interviews and workplace conversations, especially around experience and achievements. He is consolidating core grammar for talking about work and practicing interview-specific structures, with growing fluency and some lingering grammar pitfalls.

Keeps coming up

  • Verb tenseimproving
    in 2 of 4 lessons

    I am working in this company since 2019.→I have been working in this company since 2019.

  • Word choice● still there
    in 2 of 4 lessons

    I make a meeting with my team.→I have a meeting with my team.

  • Verb form✦ new
    in 2 of 4 lessons

    If I would have more time, I would check everything two times.→If I had more time, I would check everything twice.

Working on now

  1. 1Job interview skills and STAR method answers
  2. 2Expressing work experience using present perfect (continuous) and past simple
  3. 3Complex sentence structures conditionals, polite questions
  4. 4Role-specific vocabulary and collocations (campaign, responsible for, increase by)

Getting better

  • Lucas now uses present perfect continuous ('I have been working') and 'since/for' more naturally (Lesson 4, unprompted).
  • His comparative and quantifier usage (e.g. 'increased by', 'twice') has become more accurate and varied.
  • He is structuring STAR interview answers more fluently, with clearer narrative flow and better linking.

Suggested next

  • Conduct a full mock interview focus on flow and self-correction for verb tense and word choice in spontaneous speech.
  • Drill correct second conditional forms orally, contrasting them with common errors ('If I had' vs. 'If I would have').
  • Reinforce high-frequency interview collocations (have a meeting, responsible for, increase by) with context-based practice.

Updates by itself after every lesson.

Inside the portal

This is what your students see.

The lesson the evening it happened — your voice note included — and everything it adds up to, in their own portal.

One lesson, written up

koku-library.app · the lesson
Lesson 12 · Recap

Although — two ideas in one sentence

2 August
8.3OUT OF 10
A message from your teacher2 August · 1:04
1×
15151:04
ProgressLessonHomeworkAudio

Who did the talking

98.4% capturedSteady
You 54%Teacher 46%

Your speaking, measured

78
words / min
speaking pace
1.9s
thinking time
before you reply
52s
longest answer
best stretch
13
words / answer
avg turn length
17
hesitation words
um, like, you know
5
long pauses
silences ≥ 1.5s

Grammar densityMedium · 6 vocabulary items

We spent the hour on contrast — although, even though, though — and then took it into the restaurant scene you asked for. You reached for although three times unprompted, and put it in the right half of the sentence twice.

The corrections below are nearly all about where the clause sits: although opens one of the two halves, it never stands between them the way but does. Worth a slow read before the homework.

Main corrections

The food was expensive, although. → Although the food was expensive, we stayed.
although joins two halves — only though can be left at the end of a sentence

I am agree with you. → I agree with you.
agree is a verb on its own in English, so it takes no am

We are living here since 2019. → We have been living here since 2019.
since + a starting point takes the present perfect, not the present

Can you explain me the bill? → Could you explain the bill to me?
explain never takes the person straight after it — the thing first, then to me

1. Although: two ideas, one sentence

We started from the sentences you wrote last week and joined them up, one pair at a time.

  • although — in spite of the fact that
  • even though — a stronger although — when the contrast is a surprise
  • though — the same, and the only one that can sit at the end

Although the restaurant was full, they found us a table.

Contrast first, result second — the order that sounds most natural.

Pattern: Although + [clause], [clause].

Note: although and but do the same job, so one sentence never needs both.

Vocabulary · 6 items

A2: 2B1: 3B2: 1
  • although — in spite of the fact that — although it rained, we walkedB1
  • even though — a stronger although, for a contrast that surprisesB1
  • to run out of — to have none left — we ran out of breadB1
  • the bill — what you pay at the end of a mealA2
  • to book a table — to reserve a table in advanceA2
  • to be worth it — good enough to justify the cost or the effortB2

🎙️ Practice audio

Your answers, recorded here and saved with the lesson.

Speaking answer · question 1Recorded 2 August · 0:47
Practice recordingRecorded 3 August · 1:15

Homework

  • Write five sentences about your week using although, and one with even though.
  • Record a voice memo ordering a meal for two — include one question about the bill.
  • Read the six words out loud twice. The stress on although lands on the second half: al-THOUGH.

Teacher’s note

You caught two of your own mistakes today before I said anything — that is new. Next lesson we take the same contrast into writing: a short review of somewhere you liked but would not go back to.

Ten lessons, added up

koku-library.app · dashboard
LESSON STUDIO

Welcome back,

Duarte

Sign out
OverviewLessonsProgressFilesTests

Speaking habits

Pace
62wpm

words per minute when you speak

Thinking time
2.1s

average pause before you answer

Your share
47%

of the last lesson was you talking

Your progress

Score

8.1/10

▲ 2.1/10 since lesson 1
12345678910

What each lesson was marked out of ten.

Your course

Holding a chat
5Getting started10Finding words20Holding a chat40Comfortable

10 of 20 lessons towards Holding a chat

Your lessons

10
#10たび — Talking about travel2 September · 6 words8.1
#9けど — Joining two ideas26 August · 7 words7.9
#8Describing where you live19 August · 5 words7.4
#7Past tense, out loud12 August · 6 words7.5

Practise your words

62 words · 10 ready

Every word from your lessons, split by what kind of word it is. Cards you get right come back later; ones you miss come back today.

24Nouns5 to review
18Verbs3 to review
11Adjectivesall caught up
9Phrases2 to review
Practise everything62 cards →

Recap, corrections, vocabulary, audio, flashcards and every chart — built from the recording, none of it typed by the teacher.

The recorder

One extension,
then you just teach.

Lesson Studio records from inside your browser. No bot joins the call, nothing is installed on your student's side, and nothing leaves your laptop until you press send.

You'll need Google Chrome. It's a Chrome extension — free, one click from the Web Store, and it works on Mac, Windows and Linux. Not Safari, not Firefox.

Add to Chrome — freeSee the whole process →
preply.com › classroomK
KLesson Studio Recorder

Student

Minami▾
● Start recording

Records this tab and your mic on separate tracks.

What you get

The admin half of teaching, handled.

Recaps from the recording

Teach as usual. The extension records, the draft writes itself.

You review everything

Every recap waits in your queue until you approve it.

Words that come back

Every word from the lesson becomes a flashcard, due the day it would slip.

A portal per student

Lessons, vocabulary, homework and audio — in one place, under your name.

Progress that shows

Scores, talk time and vocabulary chart themselves.

Tests from your lessons

Reading, writing and speaking — built from what you actually taught.

Languages

Is yours in there?

Type the language you teach. Twenty-seven of them come back as a full write-up, with vocabulary, corrections and a practice test.

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See all twenty-seven
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All twenty-seven, and the same twenty-seven a learner keeping their own journal can pick from.

The arithmetic

80 lessons a month.
Two of them pay for it.

A teacher with twenty students. Four lessons each this month, at $30 a lesson. Here is the whole month — one dot per lesson.

Week 1W1
Week 2W2
Week 3W3
Week 4W4
78 lessons are theirs2 lessons cover Lesson Studio — all 80 written up
Lesson Studio
$48
Unlimited plan, every lesson written up
Share of the month
2.0%
2 lessons out of 80

Every one of those 80 lessons comes back written up — recap, vocabulary, homework, progress — for less than 2 of them earn you.

Pricing

Start free. Pay monthly when it works.

Three recaps free, no card. Then one plan a month, pause or cancel any time. A recap costs less than what you charge for two minutes of a lesson.

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Recaps in the student's language
Progress, notes, tests & homework
Booking, payments & your branding
Top-ups for a busy month
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Not needed
Pause or cancel any time
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Unlimited

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$48

/ month

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recaps a month

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recaps a month

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recaps a month

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Every plan includes

  • Unlimited students, each with a portal
  • Recaps in the student's language
  • Progress, notes, tests & homework
  • Booking, payments & your branding
Busy month?Plan members can top up 5 recaps for $4, 10 for $8 or 20 for $16. Extra recaps never expire.

Reviewing, editing and re-sending a recap never uses one up.

Questions

Before you start

Does it work for group lessons?

No. Lesson Studio is built for one-to-one lessons: one teacher, one student. The recorder hears your microphone and the call as two tracks, so with several students on a call their voices share one track and the recap cannot tell who said what.

Which lesson platforms does it work with?

Any lesson that happens in a Chrome tab: Zoom in the browser, Google Meet, Preply, italki. No bot joins the call.

Do I need a computer?

To record, yes: Google Chrome on a Mac, Windows or Linux computer. Your students open their recaps on any phone.

Does my student need to install anything?

No. They get a link to their own portal, and nothing is installed on their side.

Do I have to tell my student I am recording?

Yes. Ask for their agreement before you press record. Some countries require everyone on a call to consent, and Preply and italki have their own rules about recording.

What happens to recaps I don't use?

Plan recaps are for the month you pay for, so they don’t carry over. Away for a while? Pause your plan for up to three months and nothing is charged. Top-ups never expire.

Your next recap writes itself.

3 recaps free. No card. Your first lesson comes back already written.

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