PRICES
Reading and much of the practice are free. AI marking is paid for with in-app credits (¥). 100 ¥ costs CHF 0.60 or £0.53. 1,000 ¥ covers 200 sentences marked by AI.
A few typical prices for students.
Essay answers come at four levels, from the most help to the least:
| What | EachIn francs and poundsIn francsIn pounds |
|---|---|
| A sentence you write, marked by AI | 5 ¥≈ CHF 0.03≈ £0.03 |
| An essay answer of three paragraphs at the Guided level7 ¥ to start, 11 ¥ a paragraph | 40 ¥≈ CHF 0.24≈ £0.21 |
| The same at the Supported level6 ¥ to start, 4 ¥ a paragraph | 18 ¥≈ CHF 0.11≈ £0.10 |
| An essay answer at the Independent or Exam Condition level | 7 ¥ or 6 ¥≈ CHF 0.04≈ £0.03–0.04 |
| Other answers marked by AI, such as a grammar check or a word-building answer | 2–4 ¥≈ CHF 0.01–0.02≈ £0.01–0.02 |
| A practice sentence written by AI for one of your wordsUsually free once one has been written for that word | 1 ¥≈ CHF 0.01≈ £0.01 |
| Deeper notes on a word, written by AINot yet for under-16s in the EU, the UK or Switzerland | 10 ¥≈ CHF 0.06≈ £0.05 |
| A briefing on your words before a practice sessionYou can skip it | 2 ¥≈ CHF 0.01≈ £0.01 |
At the Supported and Independent levels: if your earlier essays show that one part of your paragraphs needs the most work, the app switches on an extra check of that part, for 3 ¥ a paragraph (≈ CHF 0.02 · £0.02). You can switch it off before you start.
1,000 ¥ is CHF 6.00 or £5.30 at the Bank's rate. It covers, for example, 200 sentences marked by AI, or 25 three-paragraph essay answers at the Guided level. Amounts in francs and pounds are rounded to the nearest cent or penny. Prices as of October 2026.
These figures assume each sentence passes on its first try. These extras can add to them:
Credits are bought in the app's Bank, in Swiss francs or in pounds. 100 ¥ costs CHF 0.60 or £0.53, and the smallest purchase is 250 ¥.
Users taking part in the pilot receive an allowance of credits for the pilot phase only: 600 ¥ for a student, and 150 ¥ for a parent. It does not continue after the pilot.
A bug report we confirm earns 5 ¥, and some milestones, such as a 7-day streak, earn a few more.
Teacher accounts are not open yet. Your students pay the prices above, and much of their practice is free.
Teacher tasks cost more than a student's, because the AI reads and writes far more: adding a word means writing its meanings once, for everyone on WordRunner, not marking one answer.
Adding a word that's new to WordRunner costs up to 22 ¥ (≈ CHF 0.13 · £0.12) for its meanings. 22 ¥ is set aside, and what isn't used comes back, so it usually costs less. For 100 new words, that's up to 2,200 ¥ (CHF 13.20 or £11.66).
Teachers buy credits in the app's Bank at the same rate. They choose between AI credits, which pay for the teacher tools, and ordinary credits, like a student's.
Building our two reading packs took over 3,000 AI calls, from their word lists to their practice questions. We paid for them, so your students use the packs free.
Giving consent costs nothing. Reading and much of the practice are free; your child's account pays the prices above for AI, and for extras such as more room in My Lexi.
Credits are bought from inside the account that will use them, so you can't buy credits for your child from a parent account yet.
Planned: premium reading packs, and a marketplace for study material made by teachers.
A class can have a shared pot of credits. When a student's own credits fall below 3 ¥, the pot pays for some AI marking and practice sentences, up to five a day.
Members aged 16 or over who have bought credits themselves can give some to their class's pot. We approve each gift.
Sponsors can fill a class's pot too: see For Sponsors.
We've already built two reading packs of classic books, and they're free to add: Frankenstein with The Picture of Dorian Gray, and The Hound of the Baskervilles with A Scandal in Bohemia. A third is planned: The Sign of Four with Dr Jekyll and Mr Hyde.