Derek Rosenzweig
Founder, Runtime Labs
Building Óra
About
I'm the founder of Runtime Labs, where I'm building Óra, a timeline for planning.
My work is grounded in two convictions: event structure improves the reliability of model outputs, and time is a foundational primitive for memory, planning, and action.
I'm interested in tools that enhance human agency and reasoning by helping people plan and reflect across past, present, and future.
Background
I did not plan to start a company. My work began with an interest in how brains process auditory signals and translate them into language. Over time, I gravitated toward designing interfaces for time-based human-computer interaction, moving from early prototypes toward what became Óra.
I've loved the process of building new things, and remain a science, music, and sports nerd at heart.
Runtime Labs
Runtime Labs is an independent research and product company focused on time-grounded language model interfaces. We develop systems that anchor language models in time, location, and events so natural language stays grounded in real-world context.
Óra
Óra is a timeline where conversations and plans stay organized. It gives people and models a shared surface for real-world planning.
Óra is built as a planning environment where models operate on persistent, time-structured state. Plans are preserved as timestamped events anchored in time and location, with relevant notes, photos, and links attached to each event.
Schedule with natural language and images. Óra interprets intent, proposes events for preview and approval, and updates your timeline once you commit them.
Current Work
| Planning interfaces | Natural-language planning across timelines, calendars, and notes |
|---|---|
| Time-indexed memory | Preserving model interactions in relation to past and future events |
| Human-agent collaboration | Shared surfaces where people and models can plan, revise, and commit actions |
| Mobile and voice | iOS and web interfaces for persistent event context |