MSR is a privacy coin based on Monero. Like all privacy coins it aims to enable users/holders to quickly make transactions around the globe without loss of anonymity.
Unlike Monero, Masari seems to have about sixty seconds faster blocktime (1 minute blocktime on Masari. ~2 minutes on Monero).
Masari has been around for about 3 years, and so far they have a decent community but not enough hype around their project. They have also launched a web wallet where all personal data are stored on your machine instead of third party storage.
Work is still going on in the project, regardless of the lack of social reach or partnerships. Maybe with this new integration with Revain, MSR can get the attention well deserved for a community developed, decentralized project.