Ranked in these QuestionsQuestion Ranking
Pro Encrypted message attachments
Files can be attached to messages that will also be encrypted.
Pro Passed EFF's security review
To pass EFF's security review Silent Text had to encrypt data in transit, the encryption had to be end-to-end, the app needed to provide forward secrecy, app's source code has to be open to independent review, users have to be able to verify contact's identities even with the service provider compromised, app's cryptographic design has to be well documented and app's source code has to have been audited in the last 12 months.
Pro Encrypted locationsharing
It's possible to geotag messages to share location.
Pro Messages can be set to self-destruct
Messages on both senders and receivers phones can be set to delete after a set period of time.
While the app itself is free, to use it a subscription is required with prices starting at $9.95/mo.