{"slug": "stemjson-wants-to-turn-mobile-apps-into-something-you-talk-to-not-just-tap", "title": "StemJSON Wants to Turn Mobile Apps Into Something You Talk To, Not Just Tap", "summary": "Founder Vasyl Krychun released StemJSON, a specification and iOS and Android runtimes that let a large language model extend and modify a native mobile app while it runs, rather than adding a separate chatbot interface. The project surfaced on Show HN with its spec already public and both runtimes shipped, and Krychun said, \"I'm working on making StemJSON some kind of standard.\" The approach matters because it exposes an app's own structure to a model instead of layering AI at the edges of fixed screens and flows.", "body_md": "*A language built to let a large language model reshape a native mobile app while it runs, rather than bolt a chatbot onto the side of one.*\n\nThat is the premise behind StemJSON, a project from founder Vasyl Krychun that surfaced recently on Show HN. Where most teams building AI into mobile software are adding a chat window next to an existing interface, StemJSON takes a different approach: it gives a model a structured way to extend and modify a native app on the fly, treating the interface itself as something that can respond and adapt rather than stay fixed.\n\nMost mobile software today is built the same way it has been for over a decade: fixed screens, fixed flows, with any AI layered in as a separate assistant a user can open and close. StemJSON is aimed at a different model, one where the structure of the app itself is part of what a language model can act on. Instead of an app that simply hosts a chatbot, the idea is an app whose interface can be shaped in response to what is actually happening in a conversation with a model.\n\nThat distinction matters for how the category is likely to develop. As more products put language models closer to the core of how software works, rather than at the edges of it, the tools that define how a model and an interface communicate become foundational - which reframes the interesting question for developers away from which model to call and toward how much of an app's own structure should be exposed to that model in the first place.\n\nKrychun's ambitions for the project go beyond a single launch. \"I'm working on making StemJSON some kind of standard,\" he said, adding that he knows the goal is ambitious. That framing is a choice with consequences: a standard has to be legible and useful to people who did not build it, a higher bar than shipping a working demo for one's own use case.\n\n[Google will launch four TPUs into orbit on October 1 aboard a SpaceX rocket](https://startupfortune.com/google-will-launch-four-tpus-into-orbit-on-october-1-aboard-a-spacex-rocket/)\n\nGoogle will launch its first Project Suncatcher satellite, MVP, on October 1 aboard a SpaceX Transporter-18 Falcon 9 mission from Vandenberg, carrying four TPUs to test whether AI chips can survive and operate in orbit. The mission is a real-world test of whether space-based solar power and vacuum cooling can help solve the electricity bottleneck... - [Google TPU satellite launch on October 1st](https://startupfortune.com/google-will-launch-four-tpus-into-orbit-on-october-1-aboard-a-spacex-rocket/) - [space-based AI computing data center test mission](https://startupfortune.com/google-will-launch-four-tpus-into-orbit-on-october-1-aboard-a-spacex-rocket/)\n\nStemJSON is further along than a concept in progress. The specification is already public, and runtimes for both iOS and Android are out, so developers can try the approach today rather than wait for it to ship. Choosing to describe the goal as building toward a standard, rather than stopping at a finished product, signals a project focused on getting the underlying approach right as real usage starts to test it. Standards tend to succeed or fail on how well they are adopted by other builders, which makes turning interest from a Show HN audience into actual usage the real test of whether the idea holds up outside its own demo.\n\nFor now, StemJSON sits at the intersection of two trends reshaping mobile development: the push to make AI a structural part of software rather than an add-on, and the broader industry habit of proposing new specifications whenever an emerging capability outgrows the tools built for the previous generation. Whether StemJSON becomes the reference point Krychun is aiming for will depend on what gets built with it next. More on the project is available at stemjson.com.\n\n## Join the discussion\n\n[Open in the community →](https://startupfortune.com/community/)\n\nAlmost there. Sign in and your reply posts straight away.", "url": "https://wpnews.pro/news/stemjson-wants-to-turn-mobile-apps-into-something-you-talk-to-not-just-tap", "canonical_source": "https://startupfortune.com/stemjson-wants-to-turn-mobile-apps-into-something-you-talk-to-not-just-tap/", "published_at": "2026-09-25 08:20:56+00:00", "updated_at": "2026-09-25 08:28:50.038832+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-agents", "developer-tools", "ai-products"], "entities": ["StemJSON", "Vasyl Krychun", "Show HN", "iOS", "Android", "stemjson.com"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/stemjson-wants-to-turn-mobile-apps-into-something-you-talk-to-not-just-tap", "markdown": "https://wpnews.pro/news/stemjson-wants-to-turn-mobile-apps-into-something-you-talk-to-not-just-tap.md", "text": "https://wpnews.pro/news/stemjson-wants-to-turn-mobile-apps-into-something-you-talk-to-not-just-tap.txt", "jsonld": "https://wpnews.pro/news/stemjson-wants-to-turn-mobile-apps-into-something-you-talk-to-not-just-tap.jsonld"}}