Whens
Remember when. Know when again.
Whens is an Android and iOS app that remembers when you last did recurring tasks around your home, car, garden or health — and works out when they are due again. Set an interval, mark a task done and Whens calculates the next date and reminds you in time.
A water filter, an oil change, a toothbrush, a bike service, descaling a coffee machine. Things that need doing a certain time after you last did them — and that is the part that is so easy to forget. Whens remembers for you.
The app works without an internet connection. An optional account enables personal sync across devices and family sharing. Sign in with email, Apple, Google or Seznam.cz.
Your tasks at a glance
What Whens can do
Works out your due dates
Set an interval — every three months, every year — and the last completion date. Whens does the rest. Mark it done and the next due date updates automatically.
Shows what needs attention
Due now, due soon, all good. See at a glance what needs doing today and what can wait.
Reminds you when it matters
Optional reminders for each task, at a time you choose. These are phone notifications.
Calendar and insights
A monthly overview of due dates and a chart of what you have completed over the last six months.
Share with your family
Household tasks need not rest on one person. Everyone in your family can see shared tasks and their history, and anyone can mark them done.
Your categories and icons
Start with six categories and add your own. Give each task an icon and colour so it is easy to spot.
Back up to a file
Export and import your data in a readable format. Your data belongs to you and can be taken with you.
Light and dark themes
Follow your phone settings or choose a theme yourself. The app is available in Czech, Slovak and English.
An account is optional — your records stay on your phone without one
The app works fully offline. Without signing in, all your tasks, notes and history stay only on your phone. With an account, you can sync personal tasks between your devices and share selected tasks with your family. Other family members cannot see your personal list. You can send feedback without an account; we store your message so we can reply.
No ads, no tracking, no analytics. Read our privacy notice.
Sign in your way
An optional account enables personal sync across devices and family sharing. Sign in with email, Apple, Google or Seznam.cz — whichever you prefer. We receive only your email address and, where provided, your name from these services. We do not read or access their other services. See our privacy notice.
Download the app
Scan with your phone to open the right app store for your device.