Black Box

A simple spreadsheet app for numbers, times, checks and timers.

Enter numbers with a number pad, times with a dial, checks with a tap, and timers with buttons. You only type text when naming columns and rows.

■ Use it for

・Shopping lists and packing checklists

・Household budgets, recipe ingredients and costs

・Workout logs, reading logs, play time records

・Run counters, material farming, gear comparison, character planning

・Gacha spending and how many copies you can expect

■ Features

・Column types: number, time, check, timer (stopwatch)

・Calc columns: build formulas like "Qty × Price" by picking columns

・Total rows: sum, average, largest, smallest, count

・Gacha odds: expected copies and likely range for each row, from rate, special pulls and pity

・Sorting and filtering by value range

・Multiple sheets

・English and Japanese screens

■ Private by design

・Your data stays on your device. No account needed

・No ads

・Works offline

■ Free and Premium

The free version lets you add up to 4 columns, 8 rows and 2 sheets. Premium (monthly subscription) raises the limits to 18 columns, 200+ rows and 12 sheets. Features are the same. Cancel anytime from Google Play.