QUESTIONS
ANSWERED.

NuDefndr uses Apple's SensitiveContentAnalysis framework - a privacy-first, on-device ML system that runs entirely on your iPhone's Neural Engine. No internet connection is used. Your photos are never transmitted anywhere, and no results are stored externally. The whole thing happens locally and silently on your device.

It's designed to identify intimate and sensitive (nude/naked) images - things like photos from past relationships, body or medical photos, or personal content you may have forgotten about. It won't flag your beach holiday or family photos. You can also mark specific images as safe to exclude them from future scans.

Flagged photos are shown to you in a review list. You're always in control - nothing moves automatically. For each photo you can mark it safe, leave it in your library, or move it to the encrypted Vault (Pro). Nothing is deleted or hidden without your explicit action.

• iPhone running iOS 18.0 or later
• Photos access permission granted to NuDefndr
• Sensitive Content Warning enabled in iOS Settings - the app walks you through this on first launch

That's it. No account. No sign-up. No email.

Vault is an encrypted photo container built into NuDefndr. When you move photos into it, they're encrypted immediately using ChaCha20-Poly1305 with 256-bit keys - the same standard used in Signal and modern VPNs. The Vault can only be opened with Face ID or Touch ID. There's no password recovery, no master key, and no way in except yours.

No. Encryption keys are stored in your device's iOS Keychain and never leave your phone. We don't have servers, we don't hold keys, and we genuinely cannot decrypt your vault even if asked. This isn't a policy - it's a technical reality of how the encryption is designed.

Vault contents cannot be transferred or recovered when switching devices. Keys are tied to your device's hardware-level Keychain and can't move between phones. If you're upgrading, export your photos from Vault before switching. This is intentional - it means even a physical device transfer can't compromise your data.

None. Zero analytics. No ads. No telemetry. No profiling. NuDefndr makes no network connections whatsoever. The app stores only local settings on your device. We have no idea who you are or how you use it - by design.

Core scanning is always free, with no ads. You get:

Pro unlocks full library access and the advanced security and privacy tools: