Calvora: Master every number

Name: Calvora: Master every number
Author: Stackova Labs

By: Stackova Labs App

Train your brain with math quizzes, tables, duels, and daily challenges.

Overview

Google Play Store

Downloads

Data as of 2026-10-25

Version:

1.0.3

Last updated: 2026-09-21

Ranking

#3,409,126 ▼ 52,063

Overall

Features & Capabilities

Calvora is a fast, focused mental math trainer from Stackova. Practice arithmetic until it feels automatic — then push into fractions, percentages, roots, and mixed operations.

WHAT YOU CAN PLAY
• Learn tables for addition, subtraction, multiplication, and division
• Multiple-choice quizzes with Easy, Medium, and Hard levels
• Input mode — type the answer yourself
• True / False lightning rounds
• Find the missing number
• Two-player Duel on one device
• Daily tests, review answers, and worksheet-style practice

DESIGNED TO STICK
• Clean, modern interface with night mode
• Choose your accent color
• Sound and vibration feedback
• Practice reminders so you do not lose the streak
• 11 languages, including English and Arabic

Calvora works offline for core practice. Optional ads help keep the app free. Replace the sample AdMob IDs in Play Console / strings before you publish with live ads.

Publisher: Stackova
Support: stackova7@gmail.com
Website: https://stackova.net
Privacy: https://stackova.net/p/calvora/privacy
Package: net.stackova.calvora

CATEGORY
Education

TAGS
math, mental math, quiz, brain training, arithmetic, tables, education, kids, students, practice

CONTENT RATING
Everyone — educational, no user-generated content, no chat

CONTACT
Email: stackova7@gmail.com
Website: https://stackova.net