Wire [1], which I've been trying for the past few months, seems so. It's quite rich in its feature set compared to Signal, all messages are E2E encrypted and pr

Wire [1], which I've been trying for the past few months, seems so. It's quite rich in its feature set compared to Signal, all messages are E2E encrypted and provides multi-device sync and multi-platform support. [1]: https://wire.com https://wire.com