Features
Everything shipped in the SimXmil Android app today — organized the way it's built: an encrypted core, a privacy toolkit, and a field-ready utility layer on top.
End-to-End Encryption
Every message is encrypted on-device using ECDH (Diffie-Hellman) key exchange and AES-256-GCM. The server only ever sees ciphertext.
Double Ratchet
A full Diffie-Hellman + symmetric-key chain ratchet gives every message its own key, so compromising one message never exposes the rest of the conversation.
Group Forward Secrecy
Group chats use wrapped sender keys with their own ratchet, so group messages get the same forward-secrecy guarantees as 1:1 chats.
Voice, Media & File Sharing
Photos, voice notes, documents and files all travel through the same end-to-end encryption pipeline — nothing bypasses it.
Reactions & Threaded Replies
React to any message and reply in-thread, in both direct and group chats.
Encrypted Backup & Restore
Export an encrypted backup protected by a passphrase (PBKDF2, 250,000 rounds) — restore your history on a new device without a plaintext copy ever touching disk.
Secure Device Transfer
Migrate your identity and keys to a new phone directly, without re-registering or losing history.
Multi-Device Key Backup
Link additional devices to the same identity using passphrase-wrapped key backup.
Encrypted Voice & Video Calls
Calls are set up and carried end-to-end, with a dedicated foreground call service so connections stay stable in the background.
Reliable Call Sessions
Duplicate-call guards, proper stale-call handling, and fast connect states — calls ring, connect, and end the way they should.
Call History
A clean, searchable log of past calls, including missed calls.
Group Creation & Invites
Create groups and invite people via shareable join links.
Group Admin Controls
Promote, remove, and moderate members, with clear on-screen feedback for every admin action.
Group Key Setup
A dedicated screen manages group key generation and rotation as membership changes.
EXIF Stripper
Strip camera, GPS and device metadata from photos before you send them — automatically, or on demand from the toolkit.
Document Metadata Stripper
Remove hidden metadata from PDF and DOCX files (author, editing history, embedded paths) before sharing.
Steganography
Hide AES-GCM encrypted data inside an ordinary PNG image using LSB steganography — the image looks unchanged to anyone who doesn't hold the key.
Incognito Keyboard
Blocks personalized-learning and analytics on supported keyboards while you type in SimXmil.
Clipboard Guard
Automatically clears sensitive clipboard content after a short interval.
Device Integrity Checks
Detects rooted or tampered devices and warns you before you rely on them for sensitive conversations.
Key Verification
Verify safety numbers with a contact out-of-band to confirm you are talking to the right person, not a man-in-the-middle.
Confirmed Burn / Wipe
Panic-wipe local data on demand — always behind an explicit confirmation dialog, so it can never happen by accident.
BLE Tracker Scanner
Scans nearby Bluetooth LE traffic to flag AirTag- and JioTag-style trackers that may be following you, with background notifications.
RF & EMF Monitors
Passive radio-frequency and electromagnetic-field detectors for on-the-go environmental awareness.
Acoustic Detector
Analyzes ambient acoustic frequency data for anomaly awareness in the field.
Wi-Fi Scanner
Surveys nearby Wi-Fi networks and signal strength.
Compass & Grid Reference
A precision compass plus grid-reference and magnetic-declination tools for accurate navigation.
Barometer Altitude
Uses the device barometer to estimate current altitude.
Speed Tracker & Measure Tool
Track movement speed, or measure real-world distance directly from your device.
Offline Location Tool
A location and gazetteer tool that keeps working without a live data connection.
Night Vision Shield
A red-shifted low-light screen mode that preserves night vision in the field.
Combined Tactical Dashboard
All of the above, brought together in one glanceable utility screen.
OTP Login & Onboarding
Simple, secure sign-in with one-time-passcode verification and guided onboarding.
Device Management
See every device linked to your account and revoke access to any of them at any time.
My Data
Inspect and export what SimXmil stores about your account, on your terms.
Pinned Chats & Search History Controls
Pin the conversations that matter, and clear your in-app search history whenever you want.
Fast, Cached Chat List
Chat previews load instantly from a local cache, with WhatsApp-style last-message previews, even on a slow connection.
Ready to try it?
Free on Android, available as a direct APK, and on the web.