Koaich vs. the apps in your phone's dock.

No. Signal is a one-to-one and group messaging app — there are no documents, no file workspaces, no AI features, no per-vault isolation, no email-bridged delivery. It is purpose-built for messaging and stays in that lane by design.

Documents and files (encrypted), group rooms with per-vault key isolation (so a member churn re-keys only the affected vault), AI features that run on-device against decrypted content, and an encrypted-digest mechanism for delivering messages to recipients without a Koaich account.

Koaich uses the same cryptographic primitives — Curve25519, ChaCha20-Poly1305, the X3DH key agreement — for one-to-one messaging. Group rooms use the IETF MLS protocol (RFC 9420), which provides equivalent properties at group scale.

If all you need is encrypted one-to-one or group messaging — no documents, no files, no workspace structure, no email-bridged delivery — Signal is the right answer. Koaich starts to matter once your work needs the same encryption property applied to documents, files, and group rooms.

No. SMS has no end-to-end encryption and no transport-layer encryption in the modern sense. Cell-tower-to-cell-tower traffic on the carrier network is partially encrypted under standards like A5/1 and A5/3, but the carrier itself stores and routes cleartext. A carrier can produce SMS content under legal demand; an attacker who controls the carrier can read it.

Yes. Your phone carrier can. So can anyone with a court order against the carrier. So can an attacker who SIM-swaps your phone number to a device they control — a known and well-documented attack pattern. Anyone receiving messages on a stolen or compromised phone reads them too.

Any app that uses end-to-end encryption is meaningfully more private than SMS. Signal is the messaging-only gold standard. iMessage is E2E between iPhones (but falls back to SMS for cross-platform). Koaich is built for the same property applied across messages, documents, files, and group rooms.

Less safe than other options. SMS-based 2FA is vulnerable to SIM-swap attacks where attackers transfer your phone number to a device they control, then receive your verification codes. Authenticator apps (Authy, Google Authenticator) and hardware keys (YubiKey) are stronger second factors. Most security guidance treats SMS 2FA as 'better than no 2FA, worse than app-based 2FA.'

Yes, as of late 2024 — Meta completed rolling out end-to-end encryption for all one-to-one chats and group chats using a Signal Protocol-derived implementation. Message content is sealed on your device. Encrypted cloud backups exist but are an opt-in feature requiring PIN setup; without it, backup-time history isn't end-to-end protected.

Meta cannot read message content on end-to-end encrypted conversations. Meta can still see metadata that's inherent to operating a messaging service — who you message, when, message frequency, group memberships. Honest framing: Koaich's current architecture also sees similar metadata for its own service; the difference is what each company does with it. Meta's business model is advertising; Koaich's isn't.

Meta uses Messenger metadata — your patterns of communication, not message content — as input to their advertising business. They don't sell raw data to third parties in the literal sense; they sell access to targeted advertising audiences built from your data. The distinction matters legally; in practice, the data feeds the same machine.

For just the encrypted-content question on personal chats, they're roughly equivalent — both use Signal-Protocol-derived E2E for messages. The real differences are: (1) Koaich isn't operated by an advertising company, so there's no structural incentive to maximize metadata extraction; (2) Koaich's account isn't part of a broader social-profile graph; (3) Koaich extends to documents, files, and shared rooms beyond chat. If you only want personal chat and don't mind Meta's ecosystem, Messenger works. If you want one tool for chat + docs + files all sealed the same way, that's Koaich.

LinkedIn messages are encrypted in transit (TLS) and at rest in storage (Microsoft-held keys), but they are not end-to-end encrypted. LinkedIn and Microsoft can read message content; they use it for spam filtering, product features, and recommendation systems.

Yes. LinkedIn — and Microsoft, who owns LinkedIn — has technical access to message content. This is how InMail features, 'people you may know,' spam detection, and content filtering operate. LinkedIn's privacy policy describes their access; the access exists at the architecture layer.

For salary negotiations, candidate strategy, M&A discussions, NDA-protected proposals, or anything you'd be uncomfortable having read by Microsoft staff — LinkedIn is not the right channel. The conversations are vendor-readable, retained, and producible under legal demand.

Move sensitive conversations off LinkedIn once they pass the introductory stage. End-to-end encrypted alternatives include Signal (messaging only), Koaich (messaging + documents + files for ongoing professional collaboration), or encrypted email with PGP/GPG for one-shot sensitive correspondence.

WhatsApp uses the Signal Protocol for end-to-end encryption of message content. For most users in most threat models, the content protection is genuine and meaningful — Meta cannot read your messages. The harder question is metadata: Meta retains who you message, when, group memberships, your phone number, and ties this signal to your broader Meta-platform profile for ad targeting.

Meta cannot read message content — that's encrypted end-to-end. Meta can see metadata: who you message, when, message frequency, group memberships, and your phone number is visible to anyone you've messaged. Encrypted cloud backups (opt-in, 2021+) protect message history at backup time; without that opt-in, iCloud / Google Drive backups aren't end-to-end protected.

Same encryption protocol, different operating model. Signal is a non-profit; their published response to subpoenas produces only account creation date and last connection date — they've minimized metadata at the architecture layer (sealed-sender, etc.). WhatsApp is operated by Meta, whose business model is advertising-funded; metadata flows into their broader ad-targeting graph, and subpoena responses can include metadata, contacts, and group memberships.

For just the content encryption on personal chat, they're cryptographically similar — both Signal-Protocol-derived E2E. The honest differences: (1) operator — Meta is an advertising company, so the business has a structural incentive to maximize the metadata signal; Koaich isn't ad-supported. (2) identity — WhatsApp is keyed to your phone number, visible to chat partners; Koaich uses a Koaich account, not a phone number. (3) scope — WhatsApp is messaging-only; Koaich extends the same encryption to documents, files, and shared rooms. If you want messaging-only with minimal metadata, Signal is the strongest answer. If you want chat plus the rest of your work life under the same encryption shape, that's where Koaich fits.