Your data
No names, no emails, no passwords. You can use every feature without giving any personal information.
Without linking a device
Your answers, stars, timers and dashboard are saved only in this browser. Clearing this site's data removes them.
When you link a device
Linking creates an anonymous sync account so your phone and laptop show the same progress.
| What is stored | Why |
|---|---|
| A random account ID | To group your devices. It is not linked to your name, email or student ID. |
| Your progress: answers, stars, timers, study history | To show the same progress on every linked device. |
| A scrambled (hashed) form of each device's key | To recognise your devices. The key itself is never stored, so a database leak would not let anyone into your progress. |
- Link codes work once and expire after 10 minutes.
- Repeated wrong codes are blocked for a while.
- Data is stored on Cloudflare's network.
Your random device ID (everyone)
The first time you open a lecture, your browser creates a random device ID (a string like 3f9a…) and keeps it on your device. Only a scrambled (hashed) form of it is stored on the server. It is not linked to your name, email, student ID or IP address. Clearing your browser data or using a private window gives you a new ID.
Counting usage (everyone)
When you open a lecture, the ID is sent with the name of that lecture, so the maker can count how many people use the site and which lectures they practise.
Your animal and profile
After your first checked question you get a random animal name (for example Turtle). It is not linked to your real name. Your profile shows your streak, how many questions you practised this week and how you compare with your batch. Only you can see your profile.
Improving the questions (everyone)
When you check a question, the site records:
| What is recorded | Why |
|---|---|
| Which statements you marked true or false, and the correct answers at that time | To see which statements are too hard, too easy or unclear. |
| Whether it was your first try, and whether you revealed the answer before | Only first tries without revealing count, so practice repeats don't skew the results. |
| The time and how long the question took | To spot questions that take far longer than others. |
| Your random device ID, and your anonymous sync account ID if you have linked devices | To group answers from the same person (on one or more devices), so a question can be compared between people who do well and people who struggle overall (item analysis). |
Your IP address is never stored. Results are only ever looked at per question, never per person, and they are used only to improve the questions.
Your controls
- Turn off sync on this device: the device stops syncing; your other devices are unaffected.
- Delete my synced data: removes your sync account and all synced progress from every device. Your past answers stay for item analysis but are no longer linked to that account.
- Both are under Sync devices → Backup code, turn off sync, delete data on the practice page.