Calcula vs Numvolt

Calcula is a focused mental math trainer built for daily practice. No ads, no clutter — just clean drills that get sharper the more you use them. Pick a mode, pick a length, and go. Five minutes a day is enough to feel the difference. FOUR GAME MODES • Standard — addition, subtraction, multiplication, division. Toggle on whichever you want to drill. • Percent — find X% of a number. Built for tips, discounts, and quick estimates. • Squared — squares, cubes, and square roots. • Sequence — spot the pattern and predict what comes next. THREE ANSWER STYLES • Type — punch the answer on a clean keypad. • Reveal — solve in your head, then self-grade. • Multiple Choice — pick from four options. Switch between them anytime to match how you want to practice. FLEXIBLE SESSIONS Choose time-based (30s, 1m, 3m, 5m, or unlimited) or solve-based (10, 20, 40, 100, or unlimited) sessions. Quick warm-up or long focus block — your call. FOUR DIFFICULTIES Easy, Medium, Hard, Insane. The numbers scale with you. Insane is exactly what it sounds like. STREAKS, LEVELS, AND AWARDS • Set a daily goal and build a streak. • Earn XP for every correct answer and level up. • Unlock 12 achievements — from First Steps (100 solved) to Iron Will (a 30-day streak) to Insane Master. DETAILED STATS See your accuracy, average solve time, lifetime totals, per-operation breakdowns, and best runs. Watch yourself get faster. DESIGNED FOR FOCUS • Beautiful light and dark themes built around a single accent color. • No accounts, no ads, no tracking, no notifications you didn't ask for. • Everything stays on your device. Calcula is for anyone who wants to keep their head sharp — students prepping for tests, professionals who do math on the fly, parents brushing up alongside their kids, and anyone who just enjoys a clean mental workout.

Practice mental math with short exercises and step-by-step corrections. For new installations, full sessions require Numvolt Pro: a weekly or yearly subscription, or a one-time lifetime purchase. Prices and terms are shown before purchase. Train on arithmetic, times tables, fractions and percentages. Try timed sprints or take your time in Zen mode. No account and no ads. FIFTEEN TOPICS, A HUNDRED AND FIFTY RUNGS EACH Addition, subtraction, multiplication, division, fractions, percentages, order of operations, powers, algebra, square roots, signed numbers, proportions, time and durations, unit conversion and number patterns. Each topic has its own 150-rung journey, up to five elite chapters; the difficulty adjusts during the session, block by block. You pick your starting point at setup, and you can always replay a lower level. UNDERSTAND THE METHOD, STEP BY STEP After a mistake, and at the end of a session for your slowest answers, Numvolt shows you a way to do it in your head, step by step: 71 × 87 is 70 × 87 + 87; 79² is 80² − 160 + 1. With the reflex to keep and other ways to do it. In the courses, enter a supported calculation to explore a mental math method. In Zen mode there is no timer: time to understand. SPRINTS AND A DAILY CHALLENGE 15, 30 or 60 seconds on the + − × ÷ mix. +1 per correct answer, −1 per mistake. The daily challenge is the same 60-second series for everyone, all day long. A LADDER FROM YOUR CITY TO THE WORLD Join the ladder with a nickname and your city. Your best sprint is ranked on six rungs: city, county, region, country, continent, world. After every sprint you see exactly what you climbed — "5th → 2nd · Rhône" — and how many points you need to overtake the next player. Only your nickname, city and scores are published. Never your exact location. DUEL ON ONE PHONE Two players, the same questions in the same order, 30 seconds each. Scores are revealed at the end. YOUR PROGRESS, VISIBLE XP, overall level, accuracy, day streak, seven-day chart, level per topic and session history. A Home Screen widget shows your daily goal and starts a sprint in one tap. WHAT STAYS WITH YOU Your progress lives on your iPhone, in the app's storage. No account. Anonymous usage counters, which you can switch off in Settings, only tell us where the app gets stuck. Fractions and decimals accepted on the keypad. Light, dark or automatic appearance. Available in 49 languages. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Who is it for? Anyone who wants to get faster at everyday mental math, from students to adults. It is not a preparation for a specific exam. Do I need to pay? You can answer a few questions during setup. Full sessions require Numvolt Pro, with the price in your currency shown before you pay.