SwapWhen: Replacement Reminder

When did you last change your water filter—or your toothbrush head? SwapWhen remembers your last replacement, shows what's due next, and reminds you when it's time. Mark an item replaced to start its next cycle. EVERYDAY REPLACEMENTS, ALL TOGETHER Track air and water filters, toothbrush heads, batteries, vacuum brushes, car filters, and more. Group items by location and see what's overdue, due soon, or still good at a glance. START WITH A TEMPLATE Choose from 35 ready-made templates with preset replacement cycles. Add when you last installed or replaced an item, and SwapWhen works out its next due date. REMEMBER IT. REPLACE IT. REPEAT. Get replacement reminders, mark an item replaced, and let its next cycle begin. Need more time? Snooze a reminder without changing the original due date. Use Shortcuts and Siri to fit tracking into your routine. KNOW WHAT YOU USED LAST TIME Keep a replacement history, save a product reference or link, and record how many spares you have. Your dates, parts, and notes stay together. NO ACCOUNT TO CREATE Sync across your devices with iCloud. No ads or third-party analytics. Your item data stays on your devices and in your private iCloud database when syncing. START FREE. UNLOCK ONCE. Track up to 3 active items using ready-made templates for free, with standard replacement reminders and history. SwapWhen Unlimited is a one-time purchase that unlocks: • Unlimited active items • Custom items and replacement cycles • Custom reminder schedules • Home Screen and Lock Screen widgets • CSV export and JSON backup export No subscription. Restore your purchase with the same Apple Account.