Cursor

The leading AI-native IDE, rebuilt around the idea that agents write most of the code. Cursor 3 (April 2026) introduced the Agents Window — run multiple agents in parallel across local worktrees, cloud, and remote environments — alongside Design Mode, which lets you click and drag on browser-rendered UI to give visual feedback to agents rather than describing it in text. Reached $2B ARR and $29B valuation by early 2026. June 2026: SpaceX agreed to acquire Cursor for $60 billion (approximately 3.4% of SpaceX shares at IPO valuation), making it the most valuable software tool company on record. The design-to-code layer is already embedded in the product; the acquisition raises questions about where the IDE goes with aerospace-grade capital behind it.