Privacy Policy
Last updated: November 2026
DevSpeak: Work English for Engineers ("the app") is a video app for learning workplace English, made for Chinese speakers. This policy explains what information we collect, how we use it, and how you can delete it.
You can use the app without signing in
If you do not sign in, your watch progress and study record are stored only on your own phone, and we receive no personal information.
What we store when you sign in
- Email address: the one you use for email-code sign-in, or the verified email Google gives us when you sign in with Google.
- Google account ID: only if you sign in with Google, to recognise your account. We never receive your Google password.
- Watch progress: where you are in each episode and whether you finished it, so it syncs between your devices.
- Study record: the words you mark as remembered, the lines you save, and the dates you studied (for your streak), so they sync between your devices too.
- Sign-in token: a random token given to the app after sign-in. The server stores only its hash.
When a sign-in code is requested, we briefly record the IP address of the request to prevent abuse. It is deleted automatically within two days.
What we do not do
- No advertising, and no third-party analytics or tracking.
- We do not sell, rent or share your information with anyone.
Where the information is kept
Data is stored on a server in Hong Kong (Alibaba Cloud), and the video files in Alibaba Cloud object storage in Hong Kong. Sign-in code emails are sent through Alibaba Cloud DirectMail. The database is backed up daily, and backups are kept for 14 days.
Deleting your account
You can delete your account at any time: in the app, open Me and choose Delete account, or without the app, use the account deletion page. Your email address, Google account ID, watch progress and study record are removed from the database immediately, and from backups within 14 days.
Children
The app is made for working adults and is not directed at children under 13.
Contact
For privacy questions, email kelvin.dong811@gmail.com.
If this policy changes, we will update this page and the date above.