Encrypt and decrypt messages using classic Caesar and Vigenère ciphers. Easily create secret messages to share with friends or decode incoming encrypted text.






248+ iOS apps curated and reviewed
If you already know ROT13 Decoder, this is the deeper bench. 248+ decoder encrypted apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of August 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | Free | — | No | No | Aug 2026 | |
| 2 | Free | 4.7★ (11) | No | No | May 2026 | |
| 3 | Free was $0.99 | 5.0★ (4) | — | No | Jul 2026 | |
| 4 | Free | 3.5★ (2) | No | Yes | Aug 2026 | |
| 5 | Free | — | Yes | Yes | Aug 2026 | |
| 6 | Free | 5.0★ (4) | No | No | May 2026 | |
| 7 | Free | 4.8★ (31K) | No | No | Aug 2026 | |
| 8 | Free | 4.8★ (10) | No | No | May 2026 |









Encrypt and decrypt messages using classic Caesar and Vigenère ciphers. Easily create secret messages to share with friends or decode incoming encrypted text.





Securely encode and decode messages to protect your privacy from message providers and prying eyes. Share your ciphered messages via email, SMS, social media, and more. Offers multiple ciphering methods for varying security levels.


Securely encrypt and decrypt text messages, emails, and confidential documents. Protect your sensitive information with advanced standard encryption and custom passwords for private communication.




Securely store and manage private files locally on your device with advanced encryption. Access your data with multi-factor authentication and share encrypted files seamlessly with others.


Secure your digital life by generating and storing unique, strong passwords for all your accounts in an end-to-end encrypted vault. Access your data securely across unlimited devices and share sensitive information with others.


Securely encode your messages using customizable encryption keys directly within your iMessage conversations. Choose between ephemeral or standard keys for enhanced privacy.




Secure your communications with end-to-end encrypted email, calendar, contacts, and drive. Your data is protected by your keys, not company policy, ensuring privacy and security against unauthorized access. Offers custom domain support and robust authentication methods.


Securely encrypt and decrypt text messages using a secret key. Easily copy and paste encrypted content to share across different applications.




Easily convert text to and from the Base64 number system. This free utility allows you to encode or decode text quickly, with options to copy or download the results.




This utility app allows you to encrypt and decrypt text messages using a secret key. It generates a string of random characters that can only be deciphered with the correct key, making it ideal for secure communication or hiding sensitive information.




Easily encode and decode messages using simple substitution ciphers like Caesar and Atbash. Convert up to 2,000 characters at a time and save your cipher settings for later use. Ideal for fun educational purposes, not for serious secret messaging.


Encode and decode messages using binary code or Base64. Surprise your friends with unique "upside down" messages and have fun experimenting with different communication styles.


Securely encrypt and decrypt text messages using strong AES encryption. Offers multiple cipher options for various privacy needs, including burn-after-reading and client-to-client channels. Supports QR code generation and biometric app unlock.


This app provides a secure encryption keyboard for all messaging applications. It allows you to send encrypted text, voice messages, photos, and videos, ensuring your communications remain private. All encryption is handled on your device with no data collection.