Crypton.sh

Crypton.sh is a solution that allows you to encrypt SMS messages and send them in a secure manner. Every single message and conversation is encrypted with the user’s personal key, which nobody else can access (including Crypton). Crypton uses industry standard 256-bit asymmetric encryption to encrypt the messages, which means they cannot access any user’s data. Crypton offers an API, which enables you to send and receive messages on any device, including Android and iOS phones, as well as terminals. You can receive messages for free as long as you have a phone number, and you can choose one of Crypton’s pay-as-you-go plans to send messages at a fixed cost. Crypton also encrypts any contacts that you have saved, and you can both import and export these contacts using VCF files. Crypton hosts and stores all data on servers that are physically located in Switzerland.