Privacy in Kreidezeit
Student data stayswith you.
Kreidezeit is built so that the names, grades and remarks of your classes never leave your device.
Principles
No account. No tracking.No ads.
No account
Kreidezeit needs no sign-in. There is no Kreidezeit account and no Kreidezeit server.
No tracking
No third-party analytics, advertising or crash reporting. The app contains no third-party software packages.
No ads
No ads and no selling of data. Kreidezeit is funded by the full version.
Storage
What lives where.Clearly separated.
Only on This Device
- Classes and students
- Grades and assessments
- Remarks
- Contacts and birthdays
- Safety Copies
Not in iCloud, not in the device’s iCloud backup, on no server.
In your private iCloud
- Timetable
- Lesson plans and attachments
- To-dos
- Meetings
Synced through your own Apple Account. Without iCloud, the planner stays on the device too.
So remember: keep students’ names in the class lists only, not in planner notes, to-dos or attachments.
Protection
How class listsare protected.
Face ID lock
Class lists open only after Face ID, Touch ID or your device passcode. Switch to another app and they lock at once. In the app switcher, the content is hidden.
Lock after a break
If your iPad lies unlocked on the desk, Kreidezeit locks the class lists after 2, 5 or 10 minutes without use. The default is 5 minutes, under Lock class lists after.
Stored encrypted
The data is stored with iOS’s strongest file protection. While the device is locked, it is encrypted and unreadable, even for Kreidezeit.
No names without unlocking
Outside the class lists, for example on Today, in search or in the sidebar, no students’ names appear until you unlock.
Backup
Backup and new devices.With your key.
Encrypted backup
A backup of your class lists is a file encrypted with your password. Kreidezeit doesn’t store the password. Without it, the file can’t be opened, not even by Support.
Transfer with a one-time code
For a new device, Kreidezeit creates a random 12-character code. The file goes via AirDrop, and you type the code on the new device. It works for this one transfer only.
Safety Copies
Before deleting and before a school year change, Kreidezeit makes a safety copy on the device. It is kept for 30 days and you can delete it yourself at any time.
Technical details
- Backup encryption
- AES-GCM with a 256-bit key
- Key from your password
- PBKDF2 with HMAC-SHA256, 210,000 iterations, random salt per file
- Password
- at least 8 characters, never stored
- Transfer code
- 12 characters, randomly generated, single use
- Storage on the device
- iOS file protection “Complete”, excluded from device backups
- Third-party packages
- none
Network
What leaves the device.Almost nothing.
Holidays
For school holidays, Kreidezeit asks OpenHolidays (openholidaysapi.org) only for your country and state. No student data is sent.
iCloud
The planner syncs through your private iCloud. That runs through Apple, not through Kreidezeit.
What you share
Backups, printouts and PDFs leave the device only when you share or save them yourself.
School
For yourschool leadership.
Whether student data may be processed on personal devices depends on local rules and often on the school itself. Approval from the school leadership is frequently required. This overview can help that conversation, but it is not legal advice. Your school gives the binding answer.
Also as a PDF, via “Print” in your browser.