Calculus Formulas vs Qedra

CalcRef is the complete calculus reference and study tool built for students. Whether you are preparing for AP Calculus, college exams, or reviewing core concepts, CalcRef puts every formula, table, and practice tool you need in one offline app. FORMULAS Browse over 100 calculus formulas across 8 topics: Limits and Continuity, Derivatives, Applications of Derivatives, Integrals, Techniques of Integration, Applications of Integrals, Sequences and Series, and Parametric, Polar, and Vectors. Every formula includes LaTeX-rendered notation, a plain-language description, conditions for use, and variable definitions. Computational formulas include a built-in calculator with step-by-step solutions. REFERENCE TABLES Six tables provide instant access to the essentials: - Derivative Rules (power, trig, exponential, logarithmic, inverse trig) - Integral Formulas (standard antiderivatives with conditions) - Trigonometric Identities (Pythagorean, double angle, half angle, sum/difference) - Convergence Tests (ratio, root, integral, comparison, alternating series) - Maclaurin Series (common expansions with convergence intervals) - Unit Circle (sin, cos, tan at standard angles in degrees and radians) PRACTICE Test your knowledge with flashcard-style quizzes. Each round presents 10 cards from a chosen topic or a mix of all topics. Flip to reveal each formula, mark it correct or missed, and review your score. Track your progress over time with per-topic stats and quiz history. TOOLS A unit converter covering 16 categories (length, area, volume, mass, force, pressure, temperature, energy, power, velocity, acceleration, density, viscosity, torque, flow rate, and angle) is accessible from any screen. A database of mathematical constants provides precise values for pi, e, the golden ratio, and more. BUILT FOR STUDYING Bookmark formulas to Favorites for quick access. Search finds any formula or constant as you type. Calculation history logs every result. Create and save your own custom formulas. Choose dark or light theme, set decimal precision, and toggle scientific notation. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Qedra is a step-by-step mathematics solver for university coursework, built on a computer algebra system that runs entirely on your device. WORKING YOU CAN HAND IN Every line of a derivation names the rule it applied — u-substitution, integration by parts, the power rule, Gauss-Jordan elimination — so the page reads like the working a course actually grades, not a black box that prints an answer. EXACT, NOT ROUNDED The engine is built on arbitrary-precision integers and exact fractions. A determinant comes back as -2, never as -2.0000000000000004. A radical stays a radical until you ask for a decimal. IT CHECKS ITS OWN DERIVATIONS Where supported, derivatives are checked numerically. Roots are substituted in. Antiderivatives are differentiated and compared. A derivation carries its verdict: verified, verified up to a constant, or — when the check genuinely cannot run, at a branch cut or a singularity — the named reason it could not. IT WOULD RATHER SAY LESS THAN SAY SOMETHING FALSE Ask most solvers to simplify the square root of x squared and they answer x. That is only true when x is not negative, and Qedra will not write it. Squaring both sides of a radical equation can add roots, so every candidate is substituted back into the original and the ones that fail are discarded, in front of you. An antiderivative that crosses a pole says so rather than pretending one constant covers both sides. IT REFUSES HONESTLY When something is out of range, Qedra says what it tried and why it stopped. It never invents a plausible answer, and it never silently gives up. WHAT IT SOLVES - Precalculus, algebra, equations and inequalities - Calculus I-III: limits, derivatives, integrals, partial derivatives, multiple integrals, vector calculus, and sums with closed forms - Linear algebra: determinants, inverses, row reduction, rank, eigenvalues — exact throughout - Discrete mathematics: primes, factorisation, gcd, modular arithmetic, combinatorics - Probability and statistics, complex arithmetic IN YOUR OWN LANGUAGE The explanations are translated, not only the interface. A derivation reads as mathematical prose in your language, with the terminology a lecturer would use — and the notation stays notation, left to right, in every script. INPUT THAT READS BACK A seven-page mathematics keyboard types real notation, and a live "read as" strip shows how your input was understood before you commit to it — so you can see that 1/2x was read the way you meant it. Decimal point or decimal comma, whichever your region uses. LaTeX in and LaTeX out. ALSO IN THE APP - History of what you have solved, with the notation settings frozen onto each entry - A reference library of the rules the solver cites, each stating its own hypotheses - Settings for what log means, angle units, and whether to work over the complex numbers COMPLETELY OFFLINE There is no account, no sign-up and no Qedra server. Your problems are never uploaded, because there is nowhere for them to go. The free tier shows one banner advert at the bottom of the Solve screen, and nothing you type is ever part of an advert request; Qedra Pro removes it. Put the device in airplane mode and every calculation still works. QEDRA PRO Free gives you unlimited answers, three full step-by-step derivations a day, and your last 100 problems in history. Qedra Pro removes both limits. - Monthly: $9.99 per month - Yearly: $59.99; 3-day free trial if eligible - Lifetime: $149.99 once, never renews Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Payment is charged to your Apple Account at confirmation of purchase. Manage or cancel in Settings > your Apple Account > Subscriptions. Prices are in US dollars and may vary by region. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://mwsupplylimited.github.io/qedra/privacy.html