Calculator 1005

Calculator 1005 brings back the scientific pocket calculator of the 1970s: a beige case, a seven-segment LCD with its mode indicators and the keys you remember — including the orange 2ndF layer that gives every key a second job.

It does not just look like the original, it behaves like it. Operators never show partial results; the whole formula is evaluated when you press =, with proper operator precedence and parentheses. The classic hardware tricks work too: 5 + = gives 10, pressing = again repeats the last operation, and an error locks the calculator until you press C.

Features
• Trigonometry in degrees, radians and grads
• Logarithms, powers and roots, π, x², 1/x, √x, ∛x, n!
• Numbers up to 10^±99 with EXP entry and the F⇌E switch between fixed and exponent display
• Memory registers M, A and B
• Statistics mode: enter data points and get n, Σx, Σx², mean and both standard deviations
• Everything stays where you left it — registers, statistics data and the display survive a restart

No ads, no accounts, no tracking, no internet access. The app requests no permissions at all.