Support

We read every message.

Need a hand with CalBook, found a bug, or have an idea for what should come next? Email dericktsangwork@gmail.com and we’ll get back to you as soon as we can — usually within a couple of business days.

Before you write in

A few quick things to try that solve most issues:

• Make sure you’re on the latest version of CalBook from the App Store.
• Make sure your iPhone is on a recent version of iOS.
• If the app is behaving oddly, force-quit it and reopen.
• Use Send feedback in CalBook’s settings to email us with the subject line filled in.

Reporting a bug

To help us track something down quickly, include:

• What you did and what you expected to happen.
• Your device (e.g. iPhone 15 Pro) and iOS version.
• The CalBook version (Settings → About inside the app).
• A screenshot or short screen recording if you can.

Feature requests

CalBook is built around a small set of ideas done well, so we don’t add everything — but we genuinely want to hear what would make the app more useful for you. Send a note and we’ll keep it on the list.

Purchases and restores

CalBook Pro is a one-time purchase processed by Apple. If you’ve bought Pro and it isn’t showing up, open CalBook’s settings, tap Upgrade, then tap Restore purchase. For refunds or billing questions, Apple handles those directly at reportaproblem.apple.com.

Privacy

CalBook runs entirely on your device — no accounts, no analytics, no tracking. See the Privacy Policy for the full story.