An end-to-end encrypted messaging app that syncs across all your devices without requiring a phone number. Encrypted so completely that even the platform cannot read your messages.
The Problem
01
Encryption is strong but device-bound. Multi-device sync is awkward. A phone number is required just to sign up.
02
Seamless sync and centralized data, but phone number lock-in. Privacy is optional, not default.
03
Centralized and convenient, but owned by companies with conflicting incentives. Privacy is claimed, not verifiable.
The Gap
Apps that encrypt well don't sync well. Apps that sync well don't encrypt well. Users are forced to sacrifice one for the other, a tradeoff that shouldn't exist.
Core Thesis
Today
Choose one
Indikator
Both, by design
Other apps make you choose between privacy and convenience. Indikator gives you both.
Encryption happens at the device layer. Centralized storage enables sync without compromising privacy.
Client-side open source: every security claim is verifiable by reading the code.
Platform
Email-based signup with master password and optional 2FA. Keys are derived from your password, never stored on the platform. Recovery via recovery phrase.
End-to-end encryption on every message, every device. Messages are encrypted before leaving your device. The platform holds ciphertext only.
Centralized encrypted storage enables seamless multi-device sync. Sign in anywhere. Your full conversation history is instantly available.
Zero-Knowledge Architecture
Messages are encrypted on your device before transmission. The server never sees plaintext.
Encryption keys are derived from your master password locally. We have no copy and cannot decrypt on your behalf.
We cannot search, read, or intercept your conversations. The platform is blind to message content by design.
Client-side code is open source under AGPL-3.0. Anyone can audit the encryption implementation.
Identity is email-based. No phone number required. No carrier linkage, no SIM swap risk.
Account recovery uses a recovery phrase you control. We cannot reset your access or read your data to do so.
Differentiation
| Capability | Signal | Telegram | Indikator | |
|---|---|---|---|---|
| End-to-end encrypted | Yes | Partial | Yes | Yes |
| Zero-knowledge | Yes | No | No | Yes |
| Multi-device sync | Poor | Excellent | Good | Excellent |
| Phone number required | Yes | Yes | Yes | No |
| Client-side open source | Yes | Yes | No | Yes |
| Easy account recovery | No | Yes | Partial | Yes |
Contact
Whether you're exploring Indikator for yourself or your team, we'd love to hear from you.