Radix 83
A scientific calculator with the feel of a classic graphing calculator's home screen: a dot-matrix LCD, sculpted keys and the keystrokes you already know.
Radix 83 works the way the home screen of a classic graphing calculator does. You type the whole expression, press ENTER, and the result stays on screen above the next line. It supports Ans, implied multiplication (2X, 3(4), 2π), a separate (−) key and parentheses that close themselves, and it rounds results to 14 significant digits so that 0.1+0.2 shows .3. Graphing and programming are deliberately left out. It is a calculator for everyday math, homework and quick sums.
The function set covers trigonometry in degrees or radians, logs and roots, powers and factorials, a MATH menu (►Frac, ►Dec, abs, round, iPart, fPart, int, min, max, lcm, gcd), probability with rand, nPr and nCr, and comparison tests. Output can be shown in Normal, Sci or Eng notation, floating or fixed to 0–9 decimals. Values can be stored in A–Z and θ, past calculations can be scrolled back through and pasted, and everything survives between sessions. Errors such as ERR:SYNTAX come with Quit and Goto, and Goto puts the cursor right on the problem.
The display is customizable: three color themes, three LCD styles, three screen resolutions from 16×8 to 32×16 characters, and a full or compact keypad, all previewed live.
Native Android in Kotlin and Jetpack Compose, with no third-party runtime dependencies beyond AndroidX. It needs no permissions, works fully offline, and has no ads, accounts or tracking. Available on Google Play.