A path of 90 levels where children learn a calculation strategy, practise at their own pace and take on the boss of each world. For home and for the classroom.
To unlock everything: Premium family, €1.99 a month or €14.90 a year, for up to 3 children, cancel in a few clicks.
The path from age 6 to 11, the strategies explained, the magic whiteboard and the parents’ area.
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Children choose their grade and move from world to world. Each level trains one precise skill, and stars make progress visible.
Strategies taught explicitly, strong mental images and short, regular practice.
Each level starts with a mental calculation strategy, read aloud and illustrated (ten frame, number line, bar model).
During an exercise, children can see the instructions and the trick again; if needed, the help shows the way with their own numbers. Two tries per question; after two mistakes the solution is explained, with no penalty.
A missed fact comes back later in the game, then over the following days (5 Leitner boxes). The Daily challenge mixes review with the current level.
3 quick right answers in a row make the numbers bigger, 2 mistakes make them easier, so children stay where they succeed most of the time.
No visible timer by default. Speed earns a “lightning” bonus; the 1-minute challenge is always the child’s choice.
10 to 15 minutes a day beats one long session a week.
Skills follow the French national primary maths programmes, grade by grade.
No guessing: children learn a strategy (make 10, doubles, partitioning…), see it work, then practise it.
A picture before the bare calculation: the concrete → pictorial → abstract approach made famous by Singapore maths.
8 + 5: fill the frame, 3 are left over. So 8 + 5 = 10 + 3 = 13.
27 + 8: jump to 30, then 5 more. So 27 + 8 = 35.
24 marbles shared into 3 equal groups: each group is 8, because 3 × 8 = 24.
Tools designed for 6 to 11 year olds, and clear insights for grown-ups.
Instructions and sums are read aloud, ideal for early readers: with the device’s own voice, even offline, or with the more natural online “CalcuBoss voice”.
Like a dry-erase slate: work the sum out with a finger or stylus, then wipe it clean. With Premium, a sums dictation that is marked automatically.
Pick the tables and watch the mastery map fill up. With Premium, beat your record in the 1-minute challenge.
At the end of each grade, one test that mixes everything learnt during the year. An optional worldwide and per-country leaderboard: it only shows a nickname, switched on by a parent.
Protected access: play time, skills, facts to review, export of progress, and rewards to set together. Complete with the free parent account.
Unicorns, space, dinosaurs, ocean… Each child picks a setting and a mascot.
The whole app, voice included, works in French and in English.
On a tablet, phone or computer, straight from the browser, with no app store needed.
Once installed, the app works without a connection: in the car, on holiday or in class.
On a large screen, the magic whiteboard sits right next to the question.
No ads, no hidden purchases. Try it right now without an account; to unlock everything, Premium family costs €1.99 a month or €14.90 a year, for up to 3 children.
€0 no account, just play
With the free parent account, you also get:
€1.99 a month, or €14.90 a year (€1.24 a month), VAT included
Everything that’s free, plus:
Teachers: the teacher space is free, with the first world of every grade and the homework you set. Discover the teacher space
All the details are in the terms of sale.
Set up your class in two minutes. Pupils sign in without an email address, and you can see straight away who needs help, and with which calculations.
A class code and, for each pupil, a picture code made of three pictures. Printable sign-in cards, with a QR code for tablets.
Who played and for how long, where each pupil is on the path, and how the whole class is doing, skill by skill.
Marking is automatic. You see the missed calculations, the answer given and the type of mistake: forgotten carry, neighbouring times-table fact, place value…
Pick levels to do in class or at home, with a due date. Each pupil finds them in the app, and you see who has done them.
Nicknames chosen by the teacher, no pupil contact details, no ads. All the details are in the privacy policy.
The trial is free, with no account: the first world of every grade, the placement test, the magic whiteboard, times tables practice and trophies. The parent account is free too: it backs up progress and gives access to the Parents’ area.
Premium family costs €1.99 a month or €14.90 a year, VAT included, for up to 3 children, on 2 devices signed in at a time. It unlocks the whole path (90 levels), the daily challenge, the 2-player duel, sums dictation and the 1-minute challenge. No ads, no in-app purchases. In class, CalcuBoss is free for teachers.
The free parent account backs up progress automatically: it is no longer lost if the browser is cleared, and you find it on the tablet, phone or computer. It gives access to the full parents’ dashboard, and it is what you use to upgrade to Premium family.
The parent creates the account with their email address: they receive a 6-digit code, with no password to remember. Children do not need an email address.
In a few clicks, from the Parents’ area: “Manage my subscription”. Premium stays active until the end of the paid year, then stops, with no further charge; progress is kept. A reminder email is sent at least one month before each renewal.
Changed your mind? Within 14 days of a payment, we refund you in full on request using the contact form. All the details are in the terms of sale.
CalcuBoss is for children aged 6 to 11, from Grade 1 to Grade 5 (CP to CM2 in France). Children pick their grade when they start; it can be changed at any time, and a parent can unlock levels from the Parents’ area.
10 to 15 minutes a day is enough. A short, regular session works better than one long session a week. The Parents’ area shows play time day by day.
Yes. We only ask for the parent’s email address; for the child, we recommend a nickname rather than their real first name.
With an account, profiles and progress (nickname, avatar, grade, theme, stars, points, trophies, answer statistics) are stored with Cloudflare, our host, in a database preferably located in Western Europe and encrypted on disk. They are never sold or used for advertising. From the Parents’ area, you can export the data or delete the account, which erases the copy of the progress and the sign-in sessions.
All the details are in the privacy policy.
Just one: cb_session, which keeps you signed in to the account for 6 months. It is strictly necessary, which is why there is no consent banner. There are no advertising cookies, no third-party cookies and no third-party scripts.
To learn what works and improve the app, CalcuBoss measures its own audience, with no third-party tool: app opened, games finished (type, grade, level, correct answers, duration, stars), placement test result, locked content reached, features used.
These statistics rely on a random device identifier: never a name, an email address or free text, and CalcuBoss does not store IP addresses. They are never linked to the account, even when you are signed in. They are deleted after 13 months, and you can turn them off in the app settings (“Anonymous statistics”).
Yes. After the first visit, the browser keeps the app and it works offline. To keep it handy, install it: “Add to Home Screen” in Safari’s Share menu (iPad, iPhone), or the install button in the address bar of Chrome and Edge.
Offline, reading aloud uses the voices installed on the device. A connection is needed to sign in and to sync progress.
Any recent browser works, on a tablet, phone or computer. When online, you can choose the “CalcuBoss voice”, a high-quality voice. For the device’s own voice, the most pleasant options are:
The CalcuBoss voice and some device voices are online services: what that means.
Yes, and it is free for teachers: create your class in the teacher space. Pupils sign in with a class code and a picture code, with no email address. They play the first world of every grade and the homework you set; the rest of the path is part of Premium family. You follow the class on a dashboard and set homework in one click.
Without an account, only in the browser on the device: clearing the browser’s data therefore erases progress, so remember to export it from the Parents’ area. With an account, it is also backed up automatically to the account and synced between your devices. All the details are in the privacy policy.
Pick a grade and a theme: the first game starts in under a minute, with no account.
