Every other AI inbox works by uploading your messages. Textly doesn't have that option: the models ship inside the app and run on your hardware. That single architectural decision is what makes everything else safe.
An on-device model reads a message the way a suspicious human would: who is it claiming to be, what does it want, and does the link agree with either answer?
Flagged messages move to Spam and their links are disabled until you overrule it.
The local message database and every channel credential sit behind the platform's hardware-backed key storage (the Android Keystore, or the iOS Keychain and Secure Enclave), tied to your screen lock.
This is the part most messengers quietly skip: the copy on your phone is usually the easiest one to steal.
WhatsApp messages stay end-to-end encrypted, and Textly never weakens that: WhatsApp decrypts them on your phone as it always has, and Textly reads the result there without ever contacting WhatsApp. Telegram, Discord and Slack are encrypted to their servers but readable by those services. SMS, on Android, has no end-to-end encryption at all.
No app can change that, and any app claiming it can is misleading you.
Classic spam filters work by shipping your message to someone else's classifier. Textly's filter is a file inside the app, so nothing is sent away to be judged.
Your corrections train nothing but your own copy.
An AI messenger is only as trustworthy as its data flow. Here is the complete list, without the marketing.
| Data | Leaves your device? | Where it goes |
|---|---|---|
| Message content | No | Stays in the local encrypted store |
| AI questions & answers | No | Computed on your processor |
| Contacts | No | Read on-device to resolve names |
| Extracted items | No | Stored beside the message they came from |
| Channel credentials | No | Keystore / Secure Enclave, never transmitted to us |
| Usage analytics | Nothing collected | No SDK is present in the app |
| Your replies | Yes, necessarily | To the channel you are replying on |
| Channel sync traffic | Yes, necessarily | Directly to WhatsApp, Telegram, Discord, Slack |
| SMS | Yes, necessarily | Over your mobile network operator |
The last three rows are the honest part: a messenger that never talked to anything would not deliver messages. What matters is that none of that traffic passes through infrastructure we operate, because we operate none. The privacy policy says the same thing in formal terms.
No server, no accounts, no uploads, and nothing you have to take on faith. Try it yourself in airplane mode.
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