Support
Last updated: 7 July 2026
The fastest way to reach us is email. Because Nduzem is run by a small team, we don't offer live chat, but we read every message and reply within one business day.
Contact
When you email, please include:
- The email address registered to your Nduzem account.
- The type of device you're using and the version of the app (Settings → About).
- A short description of what you were trying to do and what happened.
Common questions
I forgot my password
Tap "Forgot password?" on the sign-in screen. We'll send a reset link to your registered email. The link expires after 30 minutes for security.
My transfer expired before it was downloaded
Files that aren't downloaded within 7 days are deleted automatically. You'll need to send the file again. There's no way for us to recover expired transfers. The ciphertext is permanently removed from storage, and we never had the keys to decrypt it anyway.
I lost the link I generated
The URL fragment (the part after #) is the
decryption key. We never see it, so we can't recover it. Send
the file again.
My purchase didn't credit
In-app purchases are handled by Google Play. If a purchase succeeded but credits didn't appear:
- Force-close and reopen the app.
- In the app, go to Settings → Restore purchases. Your Play Store purchase history will be re-verified.
- If credits still don't appear after a few minutes, email us with your Google order ID (from your Play Store purchase history).
How do I cancel a subscription?
Cancel from your Google Play account: open Play Store → Account → Subscriptions → Nduzem → Cancel. Cancellation takes effect at the end of your current billing period; you keep access until then.
How do I delete my account?
See Account deletion.
Is my data really encrypted end-to-end?
Yes. Files are encrypted on your device before upload using libsodium's XChaCha20-Poly1305 authenticated encryption. Our servers store ciphertext only; the decryption key never leaves your device (or, for link-mode transfers, is embedded in the URL fragment we never see). See our Privacy Policy for the full picture.
Security disclosures
If you've found a security issue, please email contact@zihne.com with the subject line "Security disclosure" and a description of the issue. We take these seriously and will respond within 2 business days.