Features
You decide what each student practises. Charlie (the student’s personal AI practice assistant) turns your instruction into practice in Telegram between lessons, adapts it to how the student answers, and tells you what needs attention before the next lesson. Around it, the administration of students, lessons and packages is free.
Try Charlie free:
Each lesson can carry what the student should practise next. You write it in your own words; Charlie works from it until the next lesson.
In the lesson dialogue, under “AI practice (Charlie)”, you give the practice a first goal and, if you want, a second one. Each goal has its own instructions, and Charlie uses them verbatim: the topics to use, the words to bring in, how to correct, what not to introduce. The problem areas – what this student keeps getting wrong – apply to both goals.
Charlie works on the active goal. It moves to goal 2 after the number of correct answers in a row you set for the student, and you can switch the active goal yourself at any time. The move is counted, never left to the AI.
You do not have to type it all. “Fill from shared document” drafts the fields from that lesson's section of the student's shared document, “Fill from notes…” drafts them from your own notes, and you can dictate instead of typing. Nothing is saved until you save the lesson.
After the lesson, write or say to your assistant what you did and what the student should practise. It drafts the lesson, the goal, the instructions, the problem areas and the words, and asks “Record it?”. Yes saves it; No leaves everything as it was.
Many teachers keep a shared Google Doc per student. Link it on the student's profile and tell Lessonling how each lesson's heading looks; the lesson dialogue can then draft the lesson record and the practice instruction from that lesson's section, for you to check and save. Drafting uses the AI, so it is part of the Charlie plans.
Every student has an AI practice tab. Nothing here needs touching to start – the defaults are sensible – but each one is yours to change.
The switch that gives a student Charlie. One switched-on student is one seat in your plan; switch it off and the seat is free again.
Ticks for Conversation, Role-play, Speaking / voice messages, Vocabulary & phrases, Grammar, Writing and Picture description.
Let Charlie choose, Prefer the ticked types, or Only the ticked types.
When the daily exercise arrives and on which days. The student can change the time on their own page.
How many exercises beyond the daily one a student can ask for.
How many correct answers in a row move practice from the first goal to the second.
Never, When the student sends a voice message, or Always.
One checkbox, on by default: in short exercises the student gets one try at fixing a slip before seeing the correction.
Once the student has a support language, one tick lets Charlie use it for task wording, feedback and explanations. Otherwise Charlie keeps to the language being learned.
Field of work, interests and hobbies, about their life, coming up, and topics to avoid – so exercises fit the student's life and stay away from what they would rather not discuss.
Paste words with a translation and an example. Charlie draws on the list, favouring the words that have come up least, and the student can add to it from their page.
Charlie's observations about the student, each with a category, a confidence, a status and the evidence behind it. A wrong one can be dismissed.
Students practise in an ordinary Telegram chat, by text or by voice. Charlie writes in the language the student is learning, at their level, from your instruction.
| Practice type | What the student does |
|---|---|
| Conversation | A back-and-forth over several messages: a free conversation, a guided conversation Charlie steers toward the goal, an information-gap game, or an opinion to agree or disagree with. |
| Role-play | A realistic scene – a hotel, a shop, a meeting – with a role for Charlie and one for the student, closed with a short debrief. |
| Speaking / voice messages | Answering by voice, continuing a story or playing a scene. Charlie transcribes the voice message and replies to what was said. |
| Vocabulary & phrases | Recalling words and phrases and using them in sentences of one's own. |
| Grammar | Grammar in context: fill-in, multiple choice, sentence building and correction, reformulation, translation, short answers. |
| Writing | Micro-writing: a message, a few sentences about one's day, a story continued. |
| Picture description | Charlie sends a generated picture full of small, nameable details; the student describes what they see. |
Students can answer by voice message; Charlie transcribes it and replies to what was said. Charlie reads its replies aloud when the student asks, or as the “Reading replies aloud” setting says.
The student is never stuck: depending on the exercise, the buttons offer Hint, Explain, Skip, Another, Try again, Too easy, Too hard, Say it aloud and Show me. Saying “too hard” or “skip” in their own words works too.
Besides the daily exercise, a student can ask Charlie for another one at any time, within the daily limit you set. They can ask how they are doing and get an overview of the last 14 days. They can say “not today” or pause practice, and Charlie respects it.
Listening practice. If a student asks for it, Charlie says it can't do listening practice yet.
In short exercises – fill-in, multiple choice, sentence building or correction, reformulation, translation, short answers, recall – Charlie first points to the slip and lets the student fix it themselves. One try, always skippable. This is the one correction setting per student, on by default.
After that, the student gets the fully correct sentence with the practised part in bold and one short explanation of that mistake. Other slips are fixed quietly in the corrected sentence; the student can ask for the next explanation, one at a time.
In a conversation, a slip never stops the scene: Charlie answers in character, may nudge once, and keeps the corrections for the debrief at the end. Your instructions shape the exercises and conversations Charlie writes; how short exercises are corrected follows the fixed rules above.
Fill the gaps with the past simple: 1. Yesterday I ___ (go) to the market. 2. Last summer we ___ (take) the train to Vienna.
1. went 2. taked
There's a slip in item 2 – want to fix it yourself?
took
Yes 👍 Last summer we took the train to Vienna.
Practice on each goal starts easy and steps up as the student gets answers right. The step is decided from the student's own results, never left to the AI.
Beginners get one focus and one requirement per exercise. Stronger students may get two points at once only when the exercise is otherwise easy. Decisions and negotiations are kept for conversations, never crammed into a one-message task.
“Too hard” – the button or just the words – swaps the open exercise for an easier one on the same point straight away. Skipping is not counted as a failure. “Too easy” is taken into account for the next one.
The problem areas you entered and what Charlie has learned about the student – recurring mistakes, words that cause trouble – steer the exercises that follow. When Charlie picks the next exercise, the most relevant of them are worked into it, so a slip from earlier in the week comes up again in a new context. If the student has a vocabulary list, Charlie draws words from it too.
You see every observation Charlie keeps, and can dismiss one that is wrong.
Before you meet, your Telegram assistant sends a short summary of the practice since the last lesson: how many exercises were sent, answered and still open, what went well, what the student struggled with, what keeps recurring, and a suggested focus. The suggestion is advice; the decision is yours.
In the dashboard, each lesson's “Practice info” shows the goals, how many exercises were sent, answered, skipped, expired, correct and incorrect, the recurring mistakes, and every exercise with the student's answer and the verdict. An AI summary under “What went well”, “Struggles”, “Recurring mistakes” and “Suggested focus” is marked as advisory: the pedagogical call is yours.
Charlie's observations about the student, one sentence each – for example “Switches to present tense in longer past narratives.” They are kept separate from what you entered, and a wrong one can be dismissed.
Today's lessons and who needs your attention, in Telegram each morning if you want it.
Practice since the last lesson: 7 sent, 6 answered, 1 still open.
With a Charlie plan you also get an assistant that works for you, in your own Telegram chat.
When something is unclear – two students with the same name, two lesson types – it asks instead of guessing.
Lesson: Anna, today, 60 min
Goal: past simple of irregular verbs in short answers
Instructions: weekends and travel
Problem areas: present tense in longer stories
Words (5): went, saw, took, came, had
Record it?
Yes
Recorded and deducted from her package – 6 lessons left.
The administration side costs nothing and works with or without Charlie. It stays free when the AI trial ends.
A profile per student: contact details, the language they learn and their support language, level, time zone, notes and invoicing details. An activity trail shows every change made to the student's records. Students can be archived when they stop.
Record a lesson in one dialogue: date, length, type, what you covered and the difficulties you noticed. A wrongly recorded lesson can be deleted and its credit given back.
Sell packages of lessons with a price, a lesson length and an expiry date. Each recorded lesson is deducted from the matching package, the one expiring first; if a student has several lesson types you are asked which one it was. A lesson with no matching package is kept as a standalone lesson and you are told, so you can match it later. A package's balance, price and expiry stay editable, with a confirmation for balance changes.
For students who pay monthly, a service with a rate covers their lessons. You create the monthly invoice from the lessons taken – pick lessons or set the amount – and record when it was sent and paid. A monthly reminder tells you when it is time.
A month view of every student's lessons. Connect Google Calendar and each student's next lesson comes from your own events; regular weekly slots work as well.
Every student gets a permanent personal link – no account, no password. It shows the next lesson, their package or service, sent-and-unpaid invoices, and lets them ask to cancel or move a lesson if you allow it, with your answers shown alongside. Students with AI practice also connect Telegram, set their exercise time, pause practice, update what Charlie knows about them and keep their vocabulary list there.
The dashboard shows today's lessons and flags students whose packages are running low or expiring, by thresholds you set.
Drafting lessons from your shared document uses the AI, so it is part of the Charlie plans – see lesson notes from your shared document.
The free AI trial starts automatically when you register – no request is needed. It gives you Charlie for 1 student for up to 10 exercises or 14 days, whichever comes first, together with your own Telegram assistant for the same period.
When either limit is reached, Charlie switches off until you choose a paid plan. Lessonling's free administration features remain available.
Everything around the lesson
0 EUR / month
Free for as long as you use it
Free foreverIncludes the Charlie trial: 1 student, up to 10 exercises or 14 days – whichever comes first.
Trial ends when either limit is reached first.
AI practice for up to 5 students at a time
19 EUR / month, excl. VAT
or 190 EUR a year – ten months' price
AI practice for up to 15 students at a time
49 EUR / month, excl. VAT
or 490 EUR a year – ten months' price
Prices are excl. VAT; VAT is added at checkout. Plans are bought inside the dashboard after you sign up.
Register, add a student and leave Charlie an instruction after your next lesson. Try Charlie free with 1 student – up to 10 exercises or 14 days, whichever comes first.