Many of even the most impressive apps today have one glaring bug: they become almost useless if the network goes out. This signifies more than just an occasional inconvenience in a world saturated with connectivity. Users lose ownership over data that only exists in the cloud, and they may lose access to it entirely if a service shuts down. Meanwhile, even very simple app ideas require provisioning cloud infrastructure, and front-end developers must be constantly mindful of loading states. Local-first architecture is a paradigm for keeping the primary working copy of app data on the user's device rather than the Cloud, syncing those changes with other systems via conflict-free replicated data types (CRDT's). Let's learn about the benefits of building for local first, and how to build a "LoFi" app using Expo and CR-SQLite.