Numeris 3D Graphing Calculator

Numeris is a calculator, scientific calculator, and graphing calculator in one app — featuring 3D surface plots and symbolic derivatives up to the 5th order.

Three modes, one thoughtful design. Built for anyone who wants a calculator that's as precise and elegant as the math itself.

◆ BASIC
Full expression editor showing the complete formula as you type. Copy/paste, bracket highlighting, clear error messages. Every calculation is saved to a filterable history with dates.

◆ SCIENTIFIC
Trigonometry (sin, cos, tan and inverses), hyperbolic functions, logarithms (ln, log, log2, arbitrary bases), roots, powers, exponents, constants (π, e). RAD/DEG toggle for angle mode. All functions on one clean keyboard, including a second-function toggle for extended operations.

◆ RPN MODE
Reverse Polish notation for everyone who thinks in stacks: tap "RPN" in the header of the scientific calculator and enter values in the style of classic RPN calculators. Live stack display, Enter, SWAP, DROP, DUP and R↓, every scientific function including the second-function layer, RAD/DEG respected. The setting is remembered, and RPN calculations are saved to the history as well.

◆ 2D GRAPHING
Enter y = f(x) and watch it plot live. Multiple curves at once in 20 consistent colors. LaTeX preview as you type (proper mathematics rendering). Auto-fit zoom intelligently detects zeros, extrema, and periodicity to choose the ideal viewport. Tap a curve to highlight it.

◆ 3D GRAPHING
Surface plots z = f(x, y) with full 3D interaction: one-finger drag rotates, two-finger drag pans, pinch zooms. Height-gradient coloring reveals function structure at a glance. Wireframe rendering for clean contours.

◆ DERIVATIVES
True symbolic differentiation — not a numerical trick, but genuine expression transformation. See f'(x), f''(x) up to the 5th order as algebraic expressions, not numerical approximations. Perfect for students and teachers who want to understand the math, not just the answer.

◆ DESIGN
"Precision & Luminescence" — OLED-black, no unnecessary lines, cyan and orange accents. Glassmorphism for depth, carefully selected typography, responsive on phones and tablets, with an optimized landscape layout on tablets.

◆ PRIVACY
Numeris collects NOTHING. No accounts, no tracking, no analytics, no ads. All calculations and your history stay exclusively on your device. Fully offline-capable. Available in 20 languages.

◆ PRICE
Free. Basic and Scientific (including RPN mode) are fully unrestricted. Graphing mode offers 5 free plots to try. After that, a one-time in-app purchase (lifetime) unlocks unlimited plotting. No subscriptions, no hidden costs.

Questions? support@qorvano.com

Recent changes:
New: RPN mode in the scientific calculator (reverse Polish notation). The "RPN" button in the header switches to stack-based entry in the style of classic RPN calculators, with Enter, R↓, SWAP, DROP and DUP. All scientific functions are available in RPN mode, DEG/RAD is respected, and calculations appear in the history. Also includes an internal update of the store integration.