Block It Out
Sync your calendars. Protect your privacy. No cloud required.
Block It Out automatically synchronizes calendar events across multiple accounts by creating “shadow events” that block your time without revealing sensitive details. Everything happens on your device—no servers, no stored credentials, no risk.
The Problem
You have multiple calendars—personal, work, clients, side projects. When someone books a meeting on one, the others don’t know you’re busy. Double-bookings happen. Personal appointments leak into work calendars. Privacy suffers.
Existing solutions require you to hand over your credentials to a cloud service. OneCal, FreeBusy, Reclaim AI, CalendarBridge—they all store your calendar access on their servers. That’s a target for hackers and a privacy risk.
The Solution
Block It Out syncs your calendars entirely on your iPhone. No cloud service. No stored passwords. No middleman.
When an event appears in your source calendar, the app creates a “shadow event” in your destination calendar. The shadow blocks your time but reveals only what you choose—protecting your privacy while preventing conflicts.
How It Works
| Step | What Happens |
|---|---|
| 1. Choose Source | Select the calendar with events you want to sync |
| 2. Choose Destination | Select where shadow events should appear |
| 3. Configure (Optional) | Set filters, custom titles, and privacy options |
| 4. Sync | The app creates shadow events automatically |
That’s it. Background sync keeps everything updated, even when the app is closed.
Key Features
Privacy First
- All processing happens on your device
- Source events are never modified
- Choose exactly what information appears in shadows
- No calendar data ever leaves your phone
Flexible Sync Rules
- Filter events by title, duration, or custom conditions
- Sync to multiple destination calendars
- Customize shadow event titles and content
- Add time padding for travel or prep
Just Works
- Background sync runs automatically
- Works with iCloud, Google, Exchange, Outlook
- Recurring events maintain their patterns
- One-tap undo if you change your mind
Use Cases
Work-Life Balance
Sync personal appointments to your work calendar as “Busy” blocks. Your colleagues see you’re unavailable without knowing why.
Multiple Clients
Freelancer or consultant? Keep each client’s calendar updated with your availability from other engagements—without revealing confidential details.
Executive Assistance
Give your EA visibility into external commitments without exposing sensitive personal information.
Cross-Platform Calendars
Sync between iCloud, Google Calendar, Exchange, and Outlook—any calendars accessible through your iPhone’s Calendar app.
Why Not Cloud Sync?
| Cloud Services | Block It Out |
|---|---|
| Store your credentials on servers | No credentials stored anywhere |
| Your data lives on someone else’s infrastructure | All data stays on your device |
| Security depends on their practices | Security is Apple’s iOS security |
| Service outages affect you | Works offline, no dependencies |
| Monthly fees for basic features | One-time setup, background sync free |
As Mr. Miyagi said: “Best block? No be there.”
If your calendar data never leaves your device, it can’t be stolen from a server.
Tiers
| Tier | What You Get |
|---|---|
| Free | 1 sync rule, background sync, basic shadow events |
| Essential | 2 rules, custom titles, privacy filtering |
| Advanced | Unlimited rules, advanced filters, templates, undo |
What People Are Saying
“Finally, a calendar sync that doesn’t require handing my credentials to a random startup.”
“I’ve been looking for something like this for years. Simple and it just works.”
“The privacy-first approach sold me. No cloud, no risk.”
Ready to Get Started?
Getting Started Guide → · Features → · FAQ →
Support
- Email: support (at) block-it-out (dot) com
- Troubleshooting Guide
- Privacy Policy
© 2026 Isaiah Weiner. All rights reserved.