Theo is a Neo4j driver for Swift that provides an easy-to-use API for interacting with the graph database. The latest version, Theo 4.0, has made significant improvements, including a results-oriented API and support for Swift 4.0, while removing the deprecated REST client. The new API uses a Result type to handle errors and exceptions, making it easier to reason about and debug. With its clean design and minimal learning curve, Theo 4.0 is suitable for developers of all experience levels. Future updates will focus on bugfixes, support for new Neo4j versions, and minor improvements based on community input. As a companion project, Bolt-Swift provides an alternative way to connect to Neo4j using the Swift programming language, while PackStream-Swift offers a serialization format that can be used with Bolt. Developers are encouraged to provide feedback through Stack Overflow or the neo4j-users Slack channel.