NimbleCal is a modern web app. If you're using a recent version of Chrome, Safari, Edge, or Firefox, you're in a good place.
What NimbleCal needs from your browser
NimbleCal depends on a few browser capabilities:
- Browser storage (IndexedDB) for local-first data (fast + works offline).
- Web Crypto for end-to-end encryption.
- Cookies/session storage for sign-in.
- Notifications (optional) for reminders.
If any of these are disabled by your browser (or an extension), NimbleCal can feel "broken" even though nothing is wrong with your account.
Recommended browsers
For the smoothest experience:
- Chrome (desktop + Android)
- Safari (macOS + iOS/iPadOS)
- Edge (desktop)
- Firefox (desktop)
Private browsing and aggressive blocking
Private browsing modes and some privacy/enterprise extensions can block storage or cookies.
If you're stuck on a loading screen (or your data won't save), try:
- Open a normal (non-private) window.
- Temporarily disable ad/script blockers for app.nimblecal.com.
- Reload.
Reminders and notifications
Reminders rely on browser notifications. If reminders are not showing:
- Make sure notifications are allowed for NimbleCal in your browser/OS settings.
- See: Notifications not working
Install it like an app (recommended)
Installing NimbleCal gives you a dedicated icon and a standalone window.