Adaptive vs rigid.

Pick Runnaif you’re a pure runner, value the curated UX of a single-sport app, and your training goes mostly to plan. The app is polished and well-designed for its audience.

Pick ZoneTwoif you’re running plus something else (cycling, swim, cross-training), if life regularly interrupts your training, or if you want a coach who adapts weekly rather than following a static plan.

• Polished single-sport UX. Built for runners, by runners. The in-app experience is excellent for following a specific race plan.
• Voice guidance.In-run audio cues and pace prompts that ZoneTwo doesn’t do (we’re web, not native).
• Curated structured workouts. Pre-designed sessions that upload as structured workouts to your watch.
• Larger brand and community. Established, well-reviewed, venture-backed.

• Adaptive plan.We re-analyze every Sunday and after every 5 activities. Miss a week? The next block shifts. Runna doesn’t adapt that granularly.
• Honest about skipped workouts.We compute execution ratio, ask you how each session felt, and feed it back into next week’s plan.
• Multi-sport. If you bike or swim, we model it as part of your total load, not as a distraction.
• Conversational Q&A.Runna doesn’t have a chat coach that remembers your training history.
• Rule-based safety.Explicit overtraining detection and forced response — not just “here’s your plan”.
• Transparent methodology. We show you the formulas (Coggan, Friel, Foster). Runna is largely a black box.