Formulary+

Formulary+ is not another formula list. It is a complete computational reference — 4,727 formulas across 16 disciplines, each with an interactive solver, evaluator, or worked example that lets you compute, verify, and learn, not just look things up.

Every equation is rendered in real-time LaTeX (KaTeX), not screenshots. Every variable is defined with its SI unit. And every formula you open is one you can actually use.

WHAT MAKES IT DIFFERENT

Interactive Solver — Pick any variable, enter the rest, get the answer with full step-by-step solution. Covers 1,500+ formulas across all 16 disciplines.

Evaluator — For identities, bounds, and series: plug in numbers and see both sides computed side by side. You see not just that a claim holds, but by how much.

Worked Examples — For complex equations (tensors, PDEs, procedures): a real computation with real numbers, showing every substitution step.

Personal Notes — Write directly on any formula. Export all notes as Markdown — your work is never locked in.

4,727 FORMULAS · 16 DISCIPLINES · 150 SUBCATEGORIES

Mathematics — 356 formulas
Algebra · Calculus · Linear Algebra · Differential Equations ·
Statistics & Probability · Number Theory · Discrete Math

Physics — 448 formulas
Classical Mechanics · Thermodynamics · Electromagnetism ·
Optics · Waves · Quantum Mechanics · Relativity · Fluid Mechanics

Chemistry — 241 formulas
Stoichiometry · Thermochemistry · Kinetics · Equilibrium ·
Electrochemistry · Quantum Chemistry

Geometry — 229 formulas
Euclidean · Analytic · Differential · Topology

Mechanical Engineering — 342 formulas
Computer Science — 355 formulas
Electrical Engineering — 319 formulas
Civil Engineering — 343 formulas
Biology & Biomedical — 203 formulas
Environmental Engineering — 311 formulas
Geological Engineering — 271 formulas
Geochemistry — 204 formulas
Geophysics — 215 formulas
Chemical Engineering — 325 formulas
Meteorology & Atmospheric Science — 296 formulas
Astronomy & Astrophysics — 269 formulas

BUILT FOR REAL WORK

Real LaTeX rendering — KaTeX, not static images
Full variable definitions with SI units
Smart search across 4,727 entries
Favorites — build your personal formula collection
Related formulas — discover connected equations
Share as LaTeX, plain text, or rendered image
Export notes as Markdown
Backup & restore your favorites and notes
Dark mode · All iPhone & iPad sizes

FREE TO TRY, FAIR TO BUY

Browse the entire catalog for free — every category, every search result, every title. Open 5 formulas per day at no cost. Formulary Pro unlocks everything:

Monthly — $1.99/mo
Yearly — $19.99/yr (save 17%)
Lifetime — $29.99 once, forever

BUILT FOR

Engineering students · Science undergrads · Graduate researchers ·
STEM professionals · Exam prep (PE, FE, GATE, GRE) ·
Teachers & professors · Anyone who works with equations

Formulary Pro is an auto-renewable subscription.
- Formulary Pro Monthly / Formulary Pro Yearly
- Payment is charged to your Apple ID account at confirmation of purchase.
- Subscription automatically renews unless canceled at least 24 hours before the end of the current period.
- Manage or cancel in your Apple ID Account Settings.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://kingerders.github.io/formulary/privacy