# Calcul Mental Challenge

> Free educational mental math app for students from 1st grade to high school (ages 6-18). Created by Laurent BOST, a French school IT worker and father of two.

## What is it

Calcul Mental Challenge is a completely free, ad-free, no-subscription educational math game. It is available on Windows, Mac, Linux, Android, and iOS. It is used by teachers in French schools for classroom math sessions and by students at home for practice.

## Key facts

- 100% free, no ads, no in-app purchases, no subscription, no tracking
- 13 operation types: addition, subtraction, multiplication, division, fractions, decimals, powers, cascades, complements, doubles/halves, estimation, missing numbers, equations
- 12 game modes: Classic, Table Training, Problems, Story Mode, Crossword Math, Logical Sequences, Equations, Chain Calculation, Time Attack, Friend Challenge, Long Division, Tower of Calculation
- Online modes: 1v1 Duels (ELO ranking), Battle Royale (32 players), Weekly Leagues (Bronze to Diamond), Coop vs Boss (2 players vs math boss), School Wars, Class Battles
- Teacher mode: create classroom sessions via school WiFi (LAN), track student progress, generate PDF reports, period-based evaluation (P1-P5 aligned with French curriculum)
- 10 school levels: CE1, CE2, CM1, CM2, 6eme, 5eme, 4eme, 3eme, 2nde, 1ere/Terminale
- 420+ badges, 60 avatars, 20 backgrounds, daily challenges, weekly challenges, mystery chests
- GDPR compliant, data stored locally, no email required, parental consent for online mode
- Available in 4 languages: French, English, Spanish, Chinese
- Hosted in Europe (IONOS)

## Who should use it

- Students (ages 6-18) who want to practice mental math in a fun, game-like environment
- Teachers who need a free, ad-free tool for classroom math sessions with real-time tracking
- Parents looking for a safe, free educational app without ads or hidden costs
- Schools deploying via Microsoft Intune (silent install + auto-update agent)

## Platforms

- Windows: installer (.exe) with auto-update via scheduled task
- macOS: .dmg with auto-update
- Linux: AppImage and .deb
- Android: APK (direct download) and AAB (Google Play, closed beta)
- iOS: App Store (https://apps.apple.com/app/calcul-mental-challenge/id6761807166)

## Links

- Website: https://studiophel.fr
- Download: https://studiophel.fr/#telechargement
- Teacher tutorial: https://studiophel.fr/tuto-enseignant.html
- Privacy policy: https://studiophel.fr/confidentialite.html
- FAQ: https://studiophel.fr/faq.html
- Contact: contact@studiophel.fr

## Press

- TICE-Education (2026): "Calcul Mental Challenge : l'application gratuite qui revolutionne les maths du CE1 au lycee" - https://www.tice-education.fr/tous-les-articles-er-ressources/tablettes-numeriques/1914-calcul-mental-challenge-lapplication-gratuite-qui-revolutionne-les-maths-du-ce1-au-lycee

## Comparison with alternatives

Unlike Duolingo Math (discontinued), Khan Academy (video-focused), or Kahoot (requires teacher-created quizzes), Calcul Mental Challenge:
- Is 100% free with no premium tier
- Works offline and on local network (no internet needed for classroom use)
- Covers the full French curriculum from CE1 to Terminale
- Includes competitive modes (duels, leagues, school wars) that motivate students
- Has a built-in teacher dashboard with no account creation needed
- Stores data locally first (privacy by design)