Terms of sale and use

Last updated: 14 September 2026

These terms explain what CalcuBoss offers, what is free, what the Premium family subscription includes, how it renews, how to cancel it and how to get a refund. We have kept them clear: the key points are in the box below. This English version is provided for convenience; the French version (conditions générales de vente et d’utilisation) prevails.

1. Purpose and acceptance

These terms of sale and use (the “terms”) apply to the use of the calcuboss.com website and the CalcuBoss app, in both their free and paid offers, and to subscribing to Premium family.

By using CalcuBoss or creating an account, you accept these terms. Before subscribing to Premium family, you read them and accept them when you confirm the payment. They remain available at any time on this page, and you can save or print them.

2. Publisher and contact

CalcuBoss is published and sold by:

For any question, complaint or refund request, write to us using the contact form. We reply to the email address you give, usually within a few days. See also the legal notice.

3. The services

CalcuBoss is a mental maths app for children aged 6 to 11, from Grade 1 to Grade 5 (CP to CM2 in France). It works in any recent browser, on a tablet, phone or computer, and can be installed from the browser.

Free trial (free, no account)

With nothing to fill in, children can play the first world of every grade, take the placement test, use the magic whiteboard (free drawing), practise times tables and earn trophies. Progress stays stored on the device.

Parent account (free)

It includes everything in the free trial, automatic backup and syncing of progress across all your devices, and the Parents’ area.

Premium family (€10 a year, VAT included)

It includes everything in the parent account, plus:

• the whole path: all 90 levels, from Grade 1 to Grade 5;
• the daily challenge and the 2-player duel;
• sums dictation on the whiteboard, marked automatically;
• the 1-minute times tables challenge.

Premium family covers all the children’s profiles on the account, on every device where you are signed in, with no ads.

Teacher space (free)

Reserved for teachers, the teacher space lets you create a class, sign pupils in with a class code and a picture code (no email address), follow the class on a dashboard, see mistakes explained and set homework. It is free. Pupils of a teacher whose account has been validated get the whole path while they play in their class profile.

The offers may be enriched, for example with new levels or new features. Changes that affect subscribers are governed by section 13.

4. Account and access

• The account is created by a parent, a legal guardian or another adult, with their own email address. Only an adult can subscribe to Premium family.
• There is no password: to sign in, you receive a 6-digit code by email. You are responsible for access to your mailbox and to the devices on which you stay signed in.
• Children never need an email address: they play in a profile, using a nickname rather than their real first name.
• Teacher accounts are subject to validation. For pupils’ data, the school is the controller and ICRAFT acts as its processor: see the privacy policy.
• You agree to use CalcuBoss for its intended purpose: do not disrupt the service, do not try to access other users’ data, and do not get around the limits of the offers. In the event of a serious breach, ICRAFT may suspend access to the account.
• You can delete the account at any time from the Parents’ area (see section 7).

5. Price and payment

• Premium family costs €10 a year, all taxes included (VAT included), which is less than €1 a month. The price that applies is the one displayed when you subscribe.
• Payment is made by card, when you subscribe and then at each renewal, on the secure payment page of Stripe, our payment provider. CalcuBoss never sees or stores your card number.
• Promotional codes may be offered; they apply under the conditions announced with them.
• Premium is activated as soon as the payment is confirmed.
• Invoices are available at any time in the Parents’ area, under “Manage my subscription”, where you can also change your card.
• If a renewal payment fails, Premium may be suspended until the payment is settled. The account and progress are kept.

6. Term, renewal and reminder

Premium family is taken out for one year from the payment. Unless cancelled, it renews automatically for a further year (tacit renewal), at the price in force under the conditions of section 13.

In accordance with Article L215-1 of the French Consumer Code, we send you a reminder email at least one month before each renewal. It states the renewal date, the price and how to cancel.

If this reminder had not been sent to you, you could, as that same article provides, end the subscription free of charge at any time from its renewal, and be refunded for the remaining period.

7. Cancellation

You can cancel Premium family at any time, in a few clicks and without giving a reason: in the app, open the Parents’ area, then “Manage my subscription”.

• Cancellation takes effect at the end of the period already paid for: you keep Premium until then, and no further payment is taken.
• When the subscription ends, the account goes back to the free parent account: profiles and progress are kept, and Premium content is locked again.
• The current period is not refunded, except on request within 14 days of the payment (section 8) or in the case described in section 6.
• You can also delete the account from the Parents’ area: the subscription is then stopped immediately, with no further payment, and the account’s data is erased. If you would like a refund, ask for it before deleting the account.

8. Refunds and right of withdrawal

Changed your mind? Within 14 days of a payment, whether it is the first subscription or a renewal, we refund you in full, on request and without asking for a reason.

• To ask for it, write to us using the contact form, giving the account’s email address.
• The refund is made no later than 14 days after your request, using the payment method you paid with.
• Premium then ends and the account goes back to the free parent account, with no loss of progress.

This refund implements the right of withdrawal provided for by Articles L221-18 et seq. of the French Consumer Code. You do not have to waive it to enjoy Premium straight away: even if you have already used Premium during those 14 days, the refund is still in full.

The contact form is enough to withdraw. You can also use the model withdrawal form annexed to Article R221-1 of the French Consumer Code, or any other unambiguous statement:

9. Legal guarantee of conformity

ICRAFT is bound by the legal guarantee of conformity for digital content and services provided for by Articles L224-25-12 et seq. of the French Consumer Code, for as long as the service is supplied. If CalcuBoss does not work as described, let us know using the contact form: we will first try to restore it; failing that, you may obtain a price reduction or terminate the contract, under the conditions provided by law.

10. Availability and content

• We do our best to keep CalcuBoss available at all times, but interruptions remain possible, for example for maintenance, an update or an outage at a service provider.
• Once opened, the app also works offline. An Internet connection, at your own cost, is needed to sign in, sync progress and subscribe to or manage the subscription.
• The publisher takes care to keep the educational content accurate, but cannot guarantee that it is entirely error-free. If you spot a mistake, please report it using the contact form.
• CalcuBoss is a practice tool: it supports teaching without replacing it, and progress depends on each child. No school results are guaranteed.

11. Intellectual property

The CalcuBoss name and logo, and the app’s text, exercises, tips, illustrations, sounds and code are protected by copyright.

You may use the app at home and in class, for personal, family or educational use, within the limits of the offer you have chosen. Any other reproduction or distribution of its content, in whole or in part, requires prior permission, which you can request using the contact form.

12. Personal data

ICRAFT only processes the data needed for the service: the account’s email address, profiles and progress, and subscription information. Card details are collected and processed by Stripe only. No ads, no data sold. All the details, and how to exercise your rights, are in the privacy policy.

13. Changes to these terms

These terms may change, for example when a new feature or a new offer is added. The version in force is always published on this page, with its update date. If the change is significant, we will let you know by email or in the app.

For subscribers, a change to the price or to the essential features of Premium family only applies from the next renewal, and only if it was announced to you by email at least one month before that renewal. If you do not accept it, simply cancel before the renewal date: the subscription stops at the end of the paid year, at no cost.

14. Mediation and disputes

If you run into a problem, please write to us first using the contact form: we will look for an amicable solution together.

In accordance with Article L612-1 of the French Consumer Code, you may use a consumer mediator free of charge to seek an amicable resolution of any dispute with ICRAFT. The mediator can only be contacted after a written complaint has been sent to ICRAFT, and within one year of that complaint.

These terms are governed by French law. If you live in another European Union country, you keep the protection of the mandatory rules of the law of your country of residence. Failing an amicable agreement, you may bring the matter, at your choice, before one of the courts with territorial jurisdiction under the French Code of Civil Procedure or the court of the place where you lived when the contract was concluded or when the harmful event occurred (Article R631-3 of the French Consumer Code).

This English version is provided for convenience; the French version prevails.