CHALLENGE
Préparation brevet maths
5 m/j, pour automatiser les 30 formules du brevet. Identités remarquables, Pythagore, Thalès, trigonométrie, calcul ...
Mental Math - Kalc
Tables fractions % all ages
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
10 minutes a day, no cramming. Times tables, fractions, percentages, algebra. From middle school to adult. Every session tailored to your exact level.
10 minutes a day to keep your mental math sharp. Whether you're in middle school, in high school, or an adult who wants to reconnect with math, Kalc helps you forge solid mental reflexes, without cramming.
Spaced repetition system (SRS): concepts you master space out over time, the ones you miss come back the next day. The method known to deliver the most learning per minute practiced.
WHO IT'S FOR
· UK students (Year 7-10), US students (Grade 6-9)
· Other English-speaking systems (Canada, Australia, Ireland, NZ)
· Spanish-speaking students (Spain ESO, Mexico secundaria/preparatoria)
· French-speaking students (France, Belgium, Switzerland, Quebec)
· Adults who want to get back fluency with mental math
Each user picks their school system during onboarding. Content and examples adapt.
WHAT KALC COVERS
· Multiplication and division (times tables, decimals, signed)
· Fractions (simplification, operations, fraction of a whole)
· Percentages (calculation, increase, discount, compound change)
· Powers and square roots
· Algebra and order of operations
· Addition and subtraction of signed integers
TWO PRACTICE MODES
· Zen mode: at your own pace, no pressure, to consolidate the basics
· Chrono mode: against the clock, to build speed under exam conditions
VISIBLE PROGRESS
Every skill has its own level and progress bar. You see exactly where you stand and what's left to master.
IN REAL LIFE
Every session ends with a concrete example of how this skill serves you day to day: splitting a restaurant tab, reading a paycheck, working out a discount, planning a budget. Mental math is something you actually use.
HOME SCREEN WIDGETS
Track your progress straight from your iOS home screen, without opening the app. Streak, XP and skills in progress at a glance.
MEASURED REMINDERS
Up to 5 reminders over the first 3 weeks, off at any time. No spam, no guilt-tripping.
ONE-TIME PURCHASE, NO SUBSCRIPTION
Kalc is free to download (1 skill available without purchase). Full access unlocks with a single purchase (lifetime or 1 year non-renewing). No traps, no hidden paywall.
PRIVACY
All your data stays on your device and syncs through your personal iCloud account. No ads, no advertising tracking, no cookies.
Kalc is for people who want real progress in mental math.
Privacy policy: https://lmtdigitalcreations.com/kalc/privacy.html
Terms of use: https://lmtdigitalcreations.com/kalc/terms.html
Events
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Kalc now speaks Spanish and English
The developer, LMT Digital Creations, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Contact Info
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- LMT Digital Creations
- Size
- 15.9 MB
- Category
- Education
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 2 more
- English, French, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Plan Annuel $6.99
- Accès à vie $12.99
- Copyright
- Kalc 2026 ©
