# CryptKB — Encrypt txt or file then send

> Encrypt txt or file then send (iPhone/iPad app by Seth Farrington18896201822.)

- Source: https://appshunter.io/ios/app/cryptkb/id6761269767 (this page in markdown: same URL + `.md`)
- Developer: [Seth Farrington18896201822](https://appshunter.io/developer/1803242963)
- Category: Utilities, Social Networking
- Price: Free (on sale, was $2.99)
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English
- Released: 2026-04-27
- Data updated: 2026-08-20
- User reviews in markdown: https://appshunter.io/ios/app/cryptkb/id6761269767/reviews.md

## What is CryptKB?

CryptKB helps you encrypt message text before it leaves your iPhone or iPad.

Use the custom keyboard to write a message, choose a password, and insert an encrypted payload into Messages or another text field. Or open the Messages extension to stage a CryptKB bubble inside a Messages draft. The other person can open the same payload in CryptKB and decrypt it locally with the matching password.

Why people use CryptKB:

- Local encrypt and decrypt on device
- Custom keyboard for ordinary text fields
- Messages extension for composing and opening CryptKB bubbles
- AES-256-GCM encryption with PBKDF2-HMAC-SHA256 key derivation
- ASCII-safe payload format for copy, paste, and sharing
- Optional saved conversation passwords protected by Face ID or device passcode
- No account creation, no backend relay, no analytics SDKs, and no ad tracking in the app
- Built-in playground, settings, privacy notes, and diagnostics

How it works:

1. Switch to CryptKB Keyboard.
2. Type your message.
3. Enter a password.
4. Tap Encrypt & Insert.
5. Review the encrypted text and tap Send yourself.

To decrypt, paste or open a CryptKB payload, enter the matching password, and read the plaintext locally. CryptKB intentionally reveals decrypted text in a local panel instead of writing it back into the conversation automatically.

Important platform notes:

- Apple does not allow third-party keyboards to tap the host app's Send button, so sending is always manual.
- Password recovery is not possible by design.
- CryptKB protects message content inside its encrypted payload, not message metadata like recipients, timestamps, screenshots, or notification previews.


## Version history (last 1 release)

### 1.0 — 2026-04-27

No release notes.

## More apps by Seth Farrington18896201822

- [EXIFer Pro: GPS Timestamp EXIF](https://appshunter.io/ios/app/exifer-pro-gps-timestamp-exif/id6756196293)
- [SMIME Toolkit: S/MIME Setup](https://appshunter.io/ios/app/smime-toolkit-smime-setup/id6758324323)
- [B4U Post](https://appshunter.io/ios/app/b4u-post/id6758669603)
- [AEStego](https://appshunter.io/ios/app/aestego/id6759262567)
- [Optimized Route](https://appshunter.io/ios/app/optimized-route/id6759760714)
- [Untethered LLM](https://appshunter.io/ios/app/untethered-llm/id6760574420)

All apps by Seth Farrington18896201822: https://appshunter.io/developer/1803242963

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-20.*