Privacy

Calendum has no account and no Calendum-operated server. The developer receives only the feedback you choose to send.

The short version

• No account, no sign-up, no login.
• No Calendum-operated server.
• No analytics SDK, advertising SDK or third-party code in the app.
• No tracking, no profiling and no data sold.
• Feedback is optional, and you read it before it is sent.

Your calendars and reminders

Calendum reads and writes your calendars and reminders through Apple's own framework, on your device. The accounts you set up in iOS, whether iCloud, Google, Exchange or anything else, are reached through Apple's software with the permissions you grant in Settings. iOS and the calendar or reminder account you configured handle those reads and writes under their own terms. Calendum never sees your account credentials.

Your event titles, notes and attendees do not reach a Calendum-operated server. The names of the calendars you pick for a rule become part of that rule's settings, and those settings sync only through your own private iCloud, which the developer cannot read. The one exception is information you deliberately include in a feedback email.

Events Calendum creates

When a rule holds time as Busy on one of your calendars, Calendum writes an event to that calendar the same way you would by hand. That event carries a small marker so Calendum can recognise and clean up its own work later. By default the event is titled "Busy" and carries no detail about the event that triggered it. People who can see your work calendar learn that you are busy, not why.

Each rule has a "Show real titles" switch. If you turn it on, events from that rule carry the original title instead, and anyone who can see that calendar can read it. That is your choice, made per rule, and you can turn it off at any time. Events you create for your own tasks work the same way: the title is "Busy" unless you choose otherwise.

iCloud

Calendum's own data, meaning your tasks, rules and settings, is stored on your device and synced between your devices through the private part of your personal iCloud account.

This is Apple infrastructure under your Apple Account. The developer cannot read it, query it or reach it in any way, and no data is sent to any server operated by Calendum. Without iCloud, Calendum keeps everything on that one device.

Location

Calendum uses location for two optional features, each behind its own switch in Settings. Both switches are off by default, and Calendum never asks for your location until you turn one of them on.

"Refresh when you change places" uses movement as a wake-up signal. iOS wakes Calendum after your device moves a significant distance so it can re-check your protected time in the background. Movement is the signal and nothing more. For this feature Calendum does not inspect, store or transmit the coordinates it is given.

"Weather on your days" places a small forecast beside each day. When it is on, Calendum reads your approximate location and sends it to Apple's Weather service (WeatherKit) to fetch the local forecast. That request goes from your device to Apple, under Apple's terms and Apple's privacy policy. Calendum never stores your location, and it never reaches a Calendum-operated server, because there is none.

Turn either switch off and that use of your location ends with it.

Diagnostics and feedback

Calendum uses MetricKit, Apple's own framework, to record hangs, the moments the app froze, on your device so performance problems can be found and fixed. These reports stay in Calendum's documents on your device unless you turn on "Attach freeze reports" before sending feedback. Sending a copy does not delete the on-device report. It stays until the app's data is removed.

If you use the feedback option in the app, it opens Apple's standard mail composer with a prefilled message. You can read and edit every word, including the technical details, before you send it, and you can delete any part of it. Nothing is sent unless you tap Send. Those details cover app and system versions, device model, locale and time zone, the types and number of your calendar accounts, counts of your calendars, rules and Busy events created by rules, the state of iCloud sync, your trial or purchase status, and how many freeze reports are waiting on the device. The generated diagnostics never include calendar names, event titles or account addresses. A freeze report is attached only when you opt in, and appears as a visible JSON file in the mail composer.

If you send feedback, your mail provider delivers the message to the developer's Apple-hosted support mailbox. The developer receives your email address, the text and files you chose to send, and the generated diagnostics you left in place. Feedback is kept only as long as needed to respond or diagnose the issue, and diagnostic attachments are deleted when the issue is resolved. You can ask for deletion at any time through the support page.

Purchases

Purchases are handled entirely by Apple through the App Store. Calendum never sees your payment details. The record of whether you have purchased is held by the App Store on your device and in your App Store account.

The website

This site is hosted on Cloudflare Pages. Cloudflare necessarily processes request information such as your IP address, browser details and request time to deliver and secure the site, under Cloudflare's own privacy terms. Calendum does not enable Cloudflare Web Analytics, Browser Insights, cookies, tracking pixels or client-side JavaScript. The developer looks only at aggregate request counts in Cloudflare's dashboard. When Cloudflare's Network Error Logging setting is active, its response headers can ask your browser to send connection-failure details directly to Cloudflare. Those reports are handled by Cloudflare and are not used by Calendum to profile you.

Deleting your data

Deleting Calendum removes its local database and diagnostic files. The trial and extension dates plus a last-known purchase hint are held in the iOS Keychain and may survive a reinstall on that device. They contain no task, event, calendar, reminder or location content. Data synced through your private iCloud stays under your Apple Account until you remove Calendum's iCloud data in iOS Settings. Calendar events and reminders are held by the accounts you set up in iOS and can be managed there. The developer cannot delete either remote store for you, because neither is reachable from Calendum's side.

To delete feedback you already sent, contact the address shown on the support page from the same email address and say which message. The support copy and any diagnostic attachments will be deleted unless the law requires keeping them.

Children

Calendum is not directed at children. Information a user deliberately sends for support is handled as described in the Diagnostics and feedback section above.

Changes

If this policy changes, the revised version will be posted here with a new date. Material changes will also be noted in the app's release notes.

Contact

Questions, access requests and deletion requests go through the support page.

Last updated: 8 September 2026.