The market is running hot, and the next moves are on the edges.

Welcome to Issue 1.

Healthcare AI leads this week's Heat Index at 87 — the highest of any of the 29 categories we track. Legal follows at 86, and 3D & AR/VR at 82. What unites the three is the same thing: low saturation (avg. 10 to 40) sitting on top of high opportunity (avg. 70 to 82), with almost no wrapper risk. The tools being built in these categories are doing real work, not dressing up OpenAI's API.

The largest, most-watched categories — Coding, Image, Design, Writing — all register in the middle-to-lower heat band (45 to 69). Not because nothing is happening there. The opposite. Saturation has already happened. Wrapper risk in Social and Writing is above 45 percent. The next defensible product in those spaces is the one with the deepest integration graph, not the one with the cleverest prompt chain.

Three tools to watch this week: Devin AI (Agents, heat 87) and Stack AI (Agents, heat 87) — both leading a category whose saturation is still low enough to matter. Harvey Legal AI (Legal, heat 87) — the first major entrant in a category where every tool has compliance friction as its moat. Groq Inference API (AI Models, heat 87) — speed advantage over GPU clouds is looking more durable than it looked 60 days ago.

Two housekeeping notes. First, because this is Issue 1, there is no week-over-week delta to compare against. Starting Issue 2, every number you see here will carry a +/- pill. Second, our Graveyard section — tools marked dead this week — is empty. That is not because no AI tool died recently. It is because we are tightening our death-detection criteria before we start publishing names. Issue 2 or 3 will introduce the first entries.

See you next Monday.