Cyber-physical systems (CPS) appear in various aspects of modern life, finding applica- tions in medicine, industries, and domestic environments. Ensuring the safety of these systems is significant, as they induce risk to both humans and the environment. Given their safety-critical nature, CPS must fulfill specific correctness properties, which are typically expressed with specification languages. However, writing correct specifications is challenging, especially for newcomers. Visual programming languages like Scratch provide a user-friendly graphical interface where constructing programs is simplified by a block-based syntax using drag-and-drop components. Such tools reduce the cognitive load and enhance overall usability. Currently, these approaches exist primarily for imperative programming languages. This thesis presents a visualization environment that uses a block-based syntax for stream-based specification languages, using RTLola as an example. This tool illus- trates the RTLola language with a block-based syntax, allowing users to create a visual representation of the specification. Moreover, users can translate the block-based speci- fication into the text-based one. With this approach, we strive to lower the entry barrier for future users to learn the RTLola language and create a more user-friendly developing environment for CPS.