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Realm (formerly tight.db) is a mobile database that enables its users to develop applications faster, develop applications that are fast, and craft amazing user experiences. Realm is a replacement for SQLite & Core Data. It can save users thousands of lines of code & weeks of work, and lets them craft amazing new user experiences. It is a Y Combinator company, headquartered in San Francisco.

Simperium is a Y Combinator-funded company that builds a platform for syncing content among people and their devices. They released Simplenote as a showcase of this platform.