Shubham Saboo open-sources Excaliflow, built with Gemini 4 Argon in Antigravity

Shubham Saboo says Excaliflow is now fully open source, with the code published in a GitHub repository within the awesome-llm-apps collection.

In an X post, he says the app was built with Gemini 4 Argon in Antigravity.

The same post says Gemini 4 Argon is now available to Pro users. The post does not give details of that availability or any other terms.