ad4k is a reminder app built for scattered minds. Calls, tasks, notes, calendar and budget in one place — what matters lands on your screen as a red code.
Red code
Every item has an urgency level. What you can't miss turns red: it jumps to the top of the list, becomes a solid red card and lands on your lock screen.
Apple & Google Calendar sync
Dated to-dos and events flow into Apple Calendar, Google Calendar or any .ics-capable app through a single subscription link.
- One-click subscription link — no setup
- Adds, deletes and date changes sync automatically
- Refresh the link anytime to revoke the old one
ad4k .ics feedThe same ad4k on every screen
Your data lives in your account — a task added on desktop is on your phone seconds later.
Desktop sidebar
The Windows app waits as a tiny arrow on the edge of your screen. Click it or press Alt+Shift+A and ad4k slides in.
- Stays on top of every window
- Hides itself in full screen — games, video, slides
- Configurable side, panel width and hotkey
- Starts with Windows, runs quietly in the tray
Web app
Nothing to install. Sign in from your browser; on wide screens list, detail and calendar sit side by side.
- Three-pane desktop layout
- Rich note editor: tables, columns, video, link cards
- Two-factor auth and backups
Mobile
Add it to your home screen and it opens like an app. Today, Calls, To-dos, Calendar, Notes and Budget are one tap away.
- Installable on iOS and Android
- Swipe to snooze, swipe to complete
- Pull to refresh
Push notifications
It reminds you even when the app is closed. On call reminders you can tap "Called" or "Snooze" without unlocking.
- Red-code alerts on the lock screen
- Act right from the notification
- Daily digest and due items
- Multiple devices, managed per device
Your ad4k
Pick your accent color, set up note and budget categories your way, switch languages. The app adapts to you, not the other way around.
- 6 accent colors
- Custom note categories and colored notes
- Budget categories and investment types
- English / Turkish
Budget
Income, expenses, debts, investments and savings. Numbers flow live — see the end of the month instead of guessing it.
- Income / expense categories
- Debt and installment tracking
- Investments and savings goals
- Time-series charts
Share notes publicly
Turn any note into a public link with one click. Readers don't need an account, and you can turn sharing off anytime.
- A clean, read-only share page
- Rich content: tables, images, video
- Revoke with one click
Talk to it with AI
Connect ad4k to Claude or ChatGPT and say "remind me to call mom on Friday" — the item appears. Manage and revoke connections from settings.