Percento: Percent Calculator

Percento is a clean, sentence-based calculator designed for everyday percentage and discount calculations.
Calculate instantly offline anytime without an internet connection.

◆ 4 Practical Calculation Modes
- X% of Y: Find a percentage of a base number. Also see the values after subtracting or adding that amount.
- What %: Calculate what percentage a part is of a whole, along with the remaining percentage.
- Change: Find the percentage increase or decrease between two numbers, along with the difference and ratio.
- Discount: Calculate final prices with an original price, a discount rate, and an optional extra discount. Check the total money saved and combined discount percentage at a glance.

◆ Fast Input and Convenience
- Instant Calculation: Results update automatically with every keystroke without pressing a calculate button.
- Next Field Navigation: Move smoothly between fields using the Next button, or tap any field directly to edit.
- Calculation Details: Open the Details sheet to review step-by-step calculations and formulas. Clearly understand how compounded discounts work (e.g. 30% + 10% is not 40%, but 37% off).
- Copy Options: Tap Copy answer on the keypad to copy just the result, or open Details and tap Copy with sentence to copy the question sentence together with the answer.
- Calculation History: Automatically saves your last 100 calculations on your device. Tap any entry to restore inputs back into the calculator, or delete individual items or all history.
- Keypad Controls: Includes double zero (00) and decimal point keys. Touch and hold the Del key to clear an entire field.

◆ Display and Preferences
- Appearance: Supports Device, Light, and Dark mode.
- Decimal Places: Choose between Auto (trims trailing zeros) or fixed 0, 1, 2, or 4 decimal places.
- Sound and Haptics: Toggle key sounds and haptic vibration feedback according to your preference.
- Language: Choose between Device, English, and Korean.
- Accessibility: Fully compatible with TalkBack screen reader navigation and large system font scaling.

◆ Explicit Limitations
- Does not support currency exchange rates, VAT, sales tax, legal formulas, or restaurant tips.
- Provided for informal everyday calculations and does not constitute financial, investment, or legal advice.
- No user accounts or login required, and no external servers or cloud backups are used.
- Entered numbers and calculation history are never transmitted to external servers.

◆ Advertising and In-App Purchase
- This app is free to use and contains a single banner ad fixed at the top of the screen.
- No interstitial ads appear during calculation or number input; interstitial ads appear only when returning to the calculator from History.
- A one-time in-app purchase (Remove ads) is available in Settings to remove all ads permanently.
- Past purchases can be re-applied at any time via Restore purchase in Settings without extra charges.

◆ Data Safety and Privacy
- Calculation history and settings are stored solely on your local device and are removed when the app is uninstalled.
- For ad delivery and fraud prevention, Google Mobile Ads (AdMob) SDK may transmit encrypted advertising IDs, approximate location (IP-based), device info, and ad interaction logs.
- You can reset or delete your advertising ID anytime in your device settings.
- Users in the European Economic Area (EEA) and the UK can adjust their consent anytime via Ad privacy choices in Settings.

Recent changes:
Minor improvements and stability fixes.