Those are great questions.

Why Electron? To be honest, I was simply interested in exploring the technology. But as I started building, I realized that Electron (and web technologies in general) allowed me to solve complex UI/UX issues, like the Japanese IME cursor tracking on Windows, much more easily than other frameworks.

Why closed source? Currently, I am prioritizing building the features I personally want. The internal architecture is still in a state of trial and error, and the code is changing rapidly. I want to focus on refining the tool first. Once I feel more confident in the stability and quality of the codebase, I may consider making it open source in the future!