MathNotes - Notes that Count

Write your math the way you think it. End any line with "=" and
the answer appears instantly, right in your note.

■ As natural as thinking
No switching to a calculator, no copy-paste. Shopping lists,
bill splitting, budgets, quick engineering checks — write and
calculate in one place. Change a number, every result updates live.

■ Variables bring notes to life
Define once: coffee = 4.5
Use anywhere: coffee × 5 = 22.5
Edit the definition and everything recalculates.

■ Built-in calculator
A clean, standard four-function calculator with smart percent
(100+5%=105), sign toggle, and smart repeat.
Live result preview (light gray) shown above the input; tap ⌫ to delete a digit.
After pressing =, the result appears right after the equals sign and the preview
disappears — type a new digit to start a fresh calculation.
press = repeatedly to keep going (5 + 3 = = = → 8, 11, 14),
or press = right after an operator to repeat the last operand (5 + = → 10).

■ Full math, right in your notes
Type rent + coffee × 30 = and the answer appears in orange
instantly. Arithmetic, parentheses, percentages (20 + 20 × 15% = 23)
all work inline as you write.
Engineering math is just as easy: trig in degrees (sin(30°) or sin(deg(30)) = 0.5),
scientific functions (sqrt/sin/cos/tan/asin/exp/ln/log2/hypot/mod/cbrt…),
and unit conversion (100 km → mi, 25 °C → °F). Very large or small
results switch to scientific notation automatically.

■ Built-in how-to guide
Not sure where to start? The Settings → About screen now includes a
"How to use notes" guide covering inline = calculation, scientific functions,
angles and cross-line variables — open it and try along.

■ Ready to use on first launch
Ten pre-filled life-example notes (monthly budget, dinner splitting,
trip cost sharing, coffee spending…) ship with the app. Tweak a number
to see how "notes + calculator" works — or just delete them.

■ Why $7 ?
Because you are the customer, not the product:
• No ads — ever
• No tracking — the app requests ZERO permissions, not even internet
• No accounts — your data never leaves your device
• No in-app purchases — pay once, keep forever

■ Modern Android
Clean light and dark themes with orange result highlights, fully offline,
system backup & device-transfer support. Notes body font size is adjustable
(14–30) and applies instantly.

A pen, a page, an answer. That simple.