# Blink

> Blink is a privacy protection app for Android that hides sensitive content, apps, contacts, and call history from anyone who physically accesses your phone. It operates entirely on-device using legitimate Android enterprise APIs — zero data collection, no cloud, no accounts, no background data transmission. Available on Google Play Store. Published by Factor IO.

## Core Features

- [App Protection](/features.html#app-protection): Protected apps silently redirect to the home screen when accessed without an active session. Continuous foreground monitoring — no lock screen, no PIN prompt, no visible indicator. Free feature.
- [App Vault](/features.html#app-vault): Apps removed from the launcher and recents entirely — they appear uninstalled to anyone inspecting the phone. Uses legitimate Android enterprise device management APIs. Premium feature requiring one-time browser-guided setup.
- [Content-Aware Protection](/features.html#content-aware-protection): User-defined keyword rules scan the screen and trigger configurable lockdown responses. All processing on-device — no AI, no cloud, no data shared. Premium feature.
- [SOS Duress Mode](/features.html#sos-mode): Alternate volume sequence activates decoy mode — vault switches to show designated decoy content, app protection stays active, and configured actions (vault erasure, app lockdown) fire automatically. Full coercion resistance is vault-centric. Free feature.
- [Notification Control](/features.html#notification-control): Free tier silently drops notifications from protected apps. Premium tier replaces them with 150+ disguise profiles (calendar reminders, shipping updates, system alerts).
- [Fake Incoming Call](/features.html#fake-incoming-call): Triggers the real phone dialer with configurable caller name and number — indistinguishable from a genuine call. Free feature.
- [Hidden Contacts](/features.html#hidden-contacts): Contacts exist only inside Blink, invisible to all other apps. Created fresh with no deletion trail in the phone's contact database. Calls and messages still work. Premium feature.
- [Call Scrubber](/features.html#call-scrubber): Automatic removal of call log entries by contact, number, or category. Works retroactively on existing history and continuously on new calls. Premium feature.
- [Disguise System](/features.html#disguise-system): Blink appears as System Tools, Device Manager, Cloud Sync, Smart Switch, or 150+ other identities. No reference to "Blink" anywhere on-device. Free tier includes 7 profiles.
- [Paranoia Mode](/features.html#paranoia-mode): Maximum protection tier activating all features simultaneously. Premium feature.
- [Banking Mode](/features.html#banking-mode): Automatically pauses certain system permissions so banking apps open normally, then re-enables protection. Free feature.
- [Screen Escape](/features.html#screen-escape): Protected apps never appear in recents or lock screen after session ends. Free feature.

## Key Information

- [How Blink Works](/how-it-works.html): Five-layer architecture — disguise, protection, vault, coercion resistance, self-healing. On-device processing, session-based activation via volume sequence, multiple service recovery mechanisms.
- [Pricing](/pricing.html): Free tier with no time limit and no account required. Premium: $4/month, $30/year, $99 lifetime. All billing through Google Play.
- [FAQ](/faq.html): Common questions about privacy, features, data handling, device compatibility, and comparisons to VPNs, antivirus, and app lockers.
- [Privacy Policy](/privacy-policy.html): Zero data collection policy. No cloud storage. No user accounts required. Optional Google Drive backup is PIN-encrypted before leaving the device.
- [Blog](/blog/): Privacy guides, technical comparisons, and feature deep-dives.

## Technical Facts

- Uses legitimate Android enterprise device management APIs — no root, no exploits, no bootloader unlock
- PIN storage uses PBKDF2WithHmacSHA256 with high iteration count
- Under 10 MB installed size
- No advertising SDKs, no crash reporting to external services, no analytics, no tracking
- Background data usage verified at zero bytes
- Tested and hardened for Samsung One UI, Xiaomi MIUI, OPPO, Vivo, and Huawei
- Multiple service recovery mechanisms ensure protection resumes after Android battery optimization
- Google Play Protect compatibility maintained

## What Blink Is Not

Blink is not a VPN, antivirus, phone cleaner, or parental control app. It does not route traffic, scan for malware, or monitor children. It is a dedicated on-device privacy layer that prevents unauthorized access to sensitive content when someone physically accesses your phone. A VPN protects from remote threats. Blink protects from the person in the room.

## Intended Use Cases

- Protection from intimate partner surveillance
- Privacy when handing phone to others (family, employers, authority figures)
- Coercion resistance — SOS mode switches vault to decoy, erases real content, and keeps app protection active while you appear to comply
- Discreet exit from uncomfortable situations (Fake Incoming Call)
- Protecting communications apps (Signal, WhatsApp, Telegram) from physical access
- Hiding sensitive contacts and call history
- Automatic rule-based privacy enforcement (Content-Aware Protection)

## Publisher

Factor IO — a small product studio. No investors. No acquisition pressure. No roadmap driven by engagement metrics.
Website: https://blink.factor-io.com