Smart deadline reminders

Do it by when it matters.

ByWhen turns a deadline into a realistic reminder plan. It looks at how long the task takes, what kind of task it is, your calendar, sleep, work rhythm, and how urgent the deadline has become.

App Store coming soon Google Play coming soon Launch updates See how it works
7 days of Premium Private by design Apple Calendar aware
Calendar awareAvoid busy blocks and protect sleep before choosing the next nudge window.
ByWhen
Critical
Due Sunday at 6:00 PM
Finish project proposal
Deep work · Balanced nudges · Can split
2hRemaining
4hOpen today
Best next window Today, 3:15 PM for 45m
Why this nudge
Sleep protected, workday considered, 2 calendar blocks avoided, deadline risk rising.
Start
Later
Recurring readyDaily, weekly, monthly, yearly, and selected-day tasks roll forward after completion.
Built for real life

One reminder is not enough when the deadline is real.

ByWhen is designed for tasks that need judgment, not just a single alarm. It scores open time against practical constraints and keeps nudging when a reminder is dismissed.

01

Deadline risk

The closer the due date gets, the more urgent the plan becomes. ByWhen shows when a task is on track, at risk, or critical.

02

Task effort

A 10 minute call and a 3 hour writing session should not be scheduled the same way. ByWhen uses estimated duration and minimum session length.

03

Task type

Deep work, admin, study, calls, and out-and-away errands get different scheduling behavior because they need different kinds of time.

04

Calendar blocks

Apple Calendar events can become busy windows that ByWhen avoids when choosing when to nudge you next.

05

Sleep and work rhythm

Your wake time, sleep time, work hours, and workdays help ByWhen avoid bad times and protect the day around your real routine.

06

Reminder style

Choose a task-specific nudge style, from gentle to persistent, so the app matches the seriousness of the work.

Adaptive nudges

Dismissed does not mean forgotten.

ByWhen is made for the moment when you tap later. It reconsiders the task, the remaining time, and your schedule before deciding when to come back.

1Add the deadlineSet what is due, when it is due, how long it should take, and whether it can be split.
2Choose the task typeByWhen applies different rules for work sessions, calls, admin, study, and errands away from home or work.
3Get a best windowThe planner scores open time and explains why the nudge is happening now.
4Act from the notificationStart, log time, mark done, or remind later without losing the thread.
Premium from day one

Your first 7 days are Premium.

ByWhen starts as the full product, not a thin free tier. During the first 7 days, every smart reminder stays active. After that, your reminders remain safe, but Premium keeps all of them active and adaptive.

No account is required for the first 7 days. Subscription purchases are handled by Apple through your Apple ID.

Unlimited smart remindersKeep every deadline and recurring task active.
Calendar-aware planningUse Apple Calendar blocks when scoring open windows.
Task-specific nudgesSet the reminder style per task instead of globally.
Notification actionsStart, snooze, log time, or finish directly from the alert.
Daily rhythmProtect sleep, work hours, and workdays from bad suggestions.
Local backupKeep reminders backed up on-device with optional export to iCloud Drive.
Private by design

Your schedule should feel personal because it stays personal.

ByWhen is privacy focused by design. Your tasks, deadline plans, rhythm settings, calendar blocks, and local backups stay on your device. Data does not go to NiONlite servers for planning, and backup files only leave the device if you choose to export them to your own iCloud Drive or another destination.

On-device planningSmart reminder scoring runs from data stored locally on your iPhone.
Your iCloud, your choiceBackups only go to iCloud Drive when you explicitly export them there.
No account requiredByWhen can be used without creating a NiONlite account.
No ad trackingThe app is not built around ad networks or cross-app tracking.

Make deadlines easier to trust.

ByWhen is being prepared for app store release. The App Store and Google Play links will be added here when the product pages are live.

App Store coming soon Google Play coming soon Get launch updates