PreCalc
Precalculus, taught from zero, straight through to the door of calculus. A twelve-chapter course, built the right way, no video lectures, no ads, no subscription. Chapter P is live now, with the rest rolling out in order. Every concept is explained before the rule, worked step by step in plain English, and read aloud the first time the notation appears.
A real course, not another quiz app.
PreCalc is a mastery course in precalculus, taught from the ground up and aligned to a complete precalculus sequence, the kind that actually prepares you to open a calculus book with confidence. Twelve chapters, from algebra prerequisites through an on-ramp to limits and derivatives. You own the whole thing with one purchase: no lectures to sit through, no subscription, no expiration.
You see why before you're told what.
- Explained before the rule.Every concept is explained before the formula is stated, you understand why it works, then learn what to do with it.
- Worked step by step, read aloud.Examples walk through the reasoning one line at a time, in plain English, with the notation read aloud the first time it appears.
- Wrong answers that teach.Miss a step and you see the specific reason it's wrong, not just a red X.
- Practice you actually do.Interactive walkthroughs instead of multiple-choice, with a running solution panel that builds your work as you go.
Twelve chapters, zero to calculus.
Chapter P, the algebra foundation the whole course rests on, is available today. The remaining chapters are being written and released in order; the map below is the full course as it rolls out.
Algebra Prerequisites
Real numbers, exponents, polynomials, factoring, radicals, equations and inequalities.
Available nowFunctions & Graphs
Domain and range, graphing, transformations, composition, inverses.
Coming soonPolynomial & Rational
Quadratic models, zeros real and complex, rational functions and asymptotes.
Coming soonExponential & Log
The number e, logarithms, solving exp/log equations, growth and decay.
Coming soonTrigonometric Functions
The unit circle, six trig functions, right-triangle trig, graphs, inverses.
Coming soonAnalytic Trigonometry
Identities, sum/difference, double/half-angle, solving trig equations.
Coming soonAdvanced Trigonometry
Law of sines and cosines, vectors, dot product, complex trig form, DeMoivre.
Coming soonSystems of Equations
Linear and nonlinear systems, partial fractions, linear programming.
Coming soonMatrices & Determinants
Operations, row reduction, inverses, determinants, Cramer's rule.
Coming soonConic Sections
Parabolas, ellipses, hyperbolas, parametric and polar coordinates.
Coming soonSequences, Series & Probability
Arithmetic and geometric series, binomial theorem, counting, probability.
Coming soonIntroduction to Calculus
Limits, the derivative concept, rate of change, area as accumulation. The on-ramp.
Coming soonAnyone who has to actually learn this.
Adults returning to math after years away. Parents buying a serious tool for a teen who needs to learn it, not just pass it. High-schoolers prepping for calculus, and college students who tested into precalc and want to test back out. If you've tried other math apps and walked away because the explanations were thin and the practice was just drilling, this is the one built the other way.
Own it once.
On Google Play, Chapters P and 1 are free, work through them, see the teaching style, decide if it fits your brain, then unlock the remaining eleven with a single purchase. No subscription, no expiration, and a 30-day refund. Nothing tracks you: no accounts, no login, no ads, and no internet required after install. The App Store version is a one-time paid app.
Learn precalculus for real.
Start with Chapters P and 1 free on Google Play. An iOS version is on the way.