필터 교체 알림 D-Day

Tired of remembering the filter replacement dates for every part of your home?
From water purifiers, air purifiers, bidets, humidifiers, and even shower filters,
now manage them all neatly with just one "Filter Replacement Reminder D-Day."

■ This app is perfect for:
- Those who constantly forget water purifier filter replacement dates.
- Those who are confused by the number of filters they have, such as air purifiers, humidifiers, bidets, and shower filters.
- Those who want to see all of their home/office filters at a glance by D-Day.
- Those who want to manage filter replacement history and costs.

■ Key Features

1) Filter Registration and Management
Register and manage all the filters in your home at once. - Filter Type Classification: Water Purifier, Air Purifier, Bidet, Humidifier, Shower Filter, Other
- Filter Information Entry: Filter Name, Type, Replacement Cycle (Day/Week/Month/Year), Device Name, Manufacturer, Location (Living Room/Kitchen, etc.), Memo, Attach Photo (Up to 3)
- Automatic Replacement Cycle Calculation: Automatically calculates the next replacement date based on the last replacement date
- CRUD Functions: Add, Edit, Delete, View Filter Details
All data is securely stored in a local database (Room/SQLite).

2) Filter Replacement Check System
When a filter is replaced, it records it with a single button and automatically updates the next replacement date. - Replacement Completion Process: Confirmation Dialog → Save Replacement History → Set Next Replacement Date → Increase Replacement Count
- Batch Replacement Feature: Select multiple filters and record replacements at once
- Replacement Cancellation: Cancel within the last 24 hours
- Replacement History: View in a timeline format with dates, notes, and photos

3) Smart Notifications (D-3, D-1, D-Day, D+3)
This feature provides clear notifications only when necessary, so you don't miss the filter replacement deadline.
- Basic Notifications: D-3, D-1, D-Day, Overdue Notifications (D+1~3)
- Notification Options: Set notification time, exclude weekends, quiet times, turn individual notifications on/off
- Notification Actions: Complete replacements directly from the notification, snooze function (1 hour/3 hours/tomorrow, etc.)

4) Statistics/Analysis and Dashboard
View filter management status at a glance. - Home Dashboard: Displays total filter count, number of replacements this month, imminent filters (within 7 days), and the top three most urgent filters.
- Periodic Statistics: This week, this month, last 3/6 months, this year, all.
- Charts: Monthly replacement count, filter type-specific ratio, replacement completion rate.
- Cost Analysis: Analyze monthly costs, cumulative costs, and annual projected costs when filter prices are entered.

5) Monthly Report and PDF Generation
This report organizes this month's filter management history in an easy-to-read format.
- Report Structure: Summary, detailed status by filter, monthly graph, type distribution, earned badges, and next month's schedule.
- PDF Download: Free download after watching a rewarded ad.
- Sharing Function: Share directly via KakaoTalk, email, cloud, etc.

6) Badge and Achievement System
This feature makes filter management more enjoyable and consistent. - Replacement Achievement Badges: First Replacement, 10 Replacements, 50 Replacements, 100 Replacements, etc.
- Consecutive Achievement Badges: 3, 10, 30 Consecutive Replacements
- Duration Badges: 30 Days, 100 Days, 1 Year of App Use
- Special Badges: Perfect Management for One Month, etc.

7) Backup and Restore
Useful for keeping your data safe and transferring it to other devices.
- Local Backup (JSON)
- Backup File Restoration: Overwrite or Merge
- CSV Export: Open in Excel
- Sharing Functions: Email/Cloud, etc.

8) Search, Filtering, Calendar, Widgets
Easily find and manage data even with multiple filters. - Search: Search by filter name, device name, memo, manufacturer, location, etc.
- Initial search supported
- Filtering: By type, status (imminent/overdue/this month), location
- Calendar view: Check monthly/weekly schedule
- Widget: Urgent filter D-Day, imminent list, quick button for replacement completion

■ Advertising and Monetization Information
This app uses advertising (Google AdMob) to provide a free app.
- Banner ad at the bottom of the home screen
- Full-screen ad when a filter replacement is completed (limited to 3 times per week)
- Rewarded ad for PDF downloads (user optional)

■ Privacy and Security
- All filter data is stored only on the user's device.
- The developer does not collect filter information, photos, or history on the server.
- Only the advertising identifier (Advertising ID) is used for advertising purposes.

If you frequently miss filter replacements,
start managing your filters now with 'Filter Replacement Reminder D-Day.' Water purifiers, air purifiers, humidifiers, bidets, and shower filters.
Once you register them, you can conveniently manage them without worrying about replacement dates.