Specs
Everything you get with Black Book, in one place.
Encryption
- Messages
- End-to-end encrypted, with new keys for every message
- Photos
- Encrypted with a separate key per photo
- Sender
- Hidden from the server
- Verification
- Safety number and QR code
Account
- Identity
- Ten digit ID with a check digit, and an alias you choose
- Does not require
- Phone number, email address or access to your contacts
- Password
- At least ten characters, never leaves your phone
- Lock
- Face ID, fingerprint or password, after a time in the background you choose
- Age limit
- 18 years
Messages
- Content
- Text and photos
- Photos
- Up to 2048 pixels on the longest side, without location or other metadata
- Disappearing messages
- Off, 30 seconds, 5 minutes, 1 hour or 24 hours
- Read receipts
- Optional
- Delivery
- Instant when the recipient is online, otherwise the message waits for at most 14 days
Kill Switch
- Delete all data now
- Account, keys and everything waiting, on the phone and on the server
- Erase everything in the app
- Everything on the phone, the account is kept
- Automatic deletion
- After one week to three months without use
- Pause
- Invisible and offline until you turn it off
- Method
- The key that locks everything is deleted first
Nearby
- Radius
- From 100 metres to 1,000 kilometres, or the whole world
- Location
- Approximate, shown only as rough distance
- Posts
- Up to 500 characters and five photos, up for 24 hours, 7 days or 30 days
- Stories
- One photo and up to 200 characters, up for 24 hours, 3 days or 7 days
- Reach
- 1 km, 10 km, 50 km, 100 km or the whole world
- Safety
- Blocking both ways, reporting and moderation
Privacy
- Cookies
- None, in the app or on the website
- Ads and analytics tools
- None
- Screen protection
- Hides content in the app switcher and blocks screenshots on Android
- Backups
- Keys are never included
Platforms
- iPhone
- iOS 16.4 or later
- Android
- Android 7.0 or later
- Languages
- Norwegian and English
- Appearance
- Four themes: black and lime, black and yellow, blue and white, pink and white