Privacy Policy — 21 App

Privacy Policy — 21 App
Last updated: April 19, 2026
Developer: Biddrup Mallick
Contact: biddrup3@gmail.com
Website: https://biddrup.com

  1. Introduction
    21 is a nature tracking and offline community app.
    This policy explains how we handle your data.
  2. Data We Collect
    We collect and store locally on your device only:
  • Your chosen display name (set during onboarding)
  • Photos you take within the app
  • GPS coordinates of plants and nature observations
  • Your plant and nature records
  • Messages you send (end-to-end encrypted)
  • App preferences and settings

We do NOT collect:

  • Email addresses
  • Phone numbers
  • Financial information
  • Browsing history
  • Any data on our servers
  1. How Your Data Is Used
    All data is stored locally on your device.
    We have no access to your personal data.
    Data is used only to:
  • Display your plants and nature records
  • Enable offline community features
  • Show local leaderboards
  • Send encrypted messages to nearby users
  1. Data Sharing
    Your data may be shared with nearby users
    when you join a local network:
  • Only when you explicitly join a network
  • Uses WiFi Direct and Bluetooth technology
  • No internet connection required
  • Sharing stops when you leave the network
  • Others’ data is not permanently stored
    on your device
  1. Messages
    All messages are:
  • End-to-end encrypted (AES-256-GCM)
  • Stored locally on your device only
  • Never transmitted to our servers
  • Only accessible to sender and recipient
  1. Location Data
    GPS is used to:
  • Tag your plant and observation locations
  • Find nearby networks
  • Display local maps
    Location data stays on your device and is
    only shared within your local network
    when you choose to join.
  1. Camera and Photos
    Camera is used to:
  • Take photos of plants and nature
  • Photos stored locally on your device
  • May be shared within your local network
  1. Children and All Ages
    21 is suitable for all ages.
    We encourage people of all ages to
    learn about nature and the environment.
    We do not knowingly collect personal
    information from anyone.
    Since all data stays on your device with
    no central server, there is no risk of
    personal data being collected or misused.
  2. Data Security
  • All messages are end-to-end encrypted
  • Data stored on your device only
  • No central server stores your data
  • Delete all data by uninstalling the app
  1. Your Rights
    You have full control:
  • All data is on your device
  • Uninstall to delete all data
  • No account to delete
  • No server data to request removal
  1. No Advertisements
  • No ads in the app
  • We do not share data with advertisers
  • We do not track behavior for advertising
  1. Third Party Services
    The app uses:
  • Google Nearby Connections API
    (for local device discovery)
  • OpenStreetMap (for offline maps)
    These services may have their own
    privacy policies.
  1. Changes to This Policy
    We may update this policy occasionally.
    Changes will be reflected in the
    “Last updated” date above.
  2. Contact Us
    Questions about this policy:
    Email: biddrup3@gmail.com
    Website: https://biddrup.com
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