렌즈 D-Day

Never forget your lens replacement date again!
This contact lens reminder app manages your lens replacement date, parallax warnings, and even spare lens counts all in one place. Get started right away, no signup required.

Key Features

D-Day Countdown: Supports 1-day/2-week/1-month/custom cycles

Left/Right Individual Management: Displays opening date, scheduled replacement date, and progress for each eye

Time Difference Alert: Notifies with a badge when the gap between left and right replacement dates grows.

Spare Lens Remaining Management: Notifies when supplies are running low (thresholds can be set)

Snooze (Extension): Easily extend supplies by 1-3 days depending on your needs.

History: View opening and replacement records at a glance with a calendar/list.

Insight: View average replacement cycle, number of overdue (excessive) days, and regularity indicators.

This is how it's so convenient:

Select lens type → 2) Start opening → 3) D-Day notification → 4) Start a new cycle with a single "Replacement Complete" button. If necessary, adjust the snooze for a day or two. If supplies are running low, prepare in advance.

Notifications (Push)

Imminent: Set D-3/2/1

Same-day: D-Day morning notification (+ optional evening reminder if not processed)

Overdue: D+N cycle notification (adjustable frequency)

Low balance: Notification when a set threshold is reached

Advertising and monetization information

Banner: Bottom of the home page (D-Day)

Front: Once upon completion of "Start a new cycle" (cooldown applied to prevent overexposure)

Reward: Unlocks PDF/calendar export feature
Advertising is used sparingly to maintain and improve the app.

Permissions

Notification permission (required): Provides replacement date/approaching/overdue notifications.

Storage permission (optional): Requested only when exporting files. Most basic features are available without granting these permissions.

Privacy Protection

Storage only on the device, no sign-up or login required

No sensitive information such as location, address book, or photos collected

Minimum use of non-identifiable information for advertising and error analysis
For more information, please refer to the in-app privacy policy.

Recommended for:

Those who frequently miss replacement dates for disposable/long-life lenses

Those who find maintenance cumbersome due to different replacement cycles for the left and right lenses

Those who want to keep a calendar of replacement records