Hi Product Hunt, I'm Stephen! Training for my third marathon through this past US East Coast summer's humidity was rough. I got tired of doing mental math (or asking Claude) on which of my free windows would be less miserable to run, so I built ArcPace for myself to do it quickly. I wanted something performant, informative, and pleasant to use. I got the core function built, and started using it myself daily. From there, I just kept adding new features that I wanted. I'm really happy with where it's at, and am looking forward to adding more things that people find useful. Weather apps tell you it's 75° and clear. They don't tell you that with a dew point of 70, your easy pace will feel like tempo (it took me way too long to understand dew point vs. temperature). ArcPace scores every hour 0–100 for running and shows what it will cost your pace, all the factors that affect it, and gives you recommendation on what to bring with you on your run. The best part is being able to see when is the best window to run at a glance without doing mental math. You're also able to drill into every factor if you're interested to learn more. I also added a fun function to import your past runs, and analyze how weather might have impacted your pace. Free on iPhone: no subscription, no account, no ads. What's the toughest weather you've braved?

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1d ago

What's the worst weather you've ever run in?

I built ArcPace after a summer of 75 -and-humid runs that felt like running in a sauna, even at an easy pace. The weather app said "nice morning," my heart rate disagreed. I got tired of doing the mental math on every factor that matters.

Curious what wrecks your runs most: heat, dew point, wind, or rain? And is there anything you'd want a forecast to tell you that weather apps don't?

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ArcPace

Find your best hour to run, scored for the weather

Find your best hour to run, scored for the weather

Forum Threads

What's the worst weather you've ever run in?

Forum Threads

What's the worst weather you've ever run in?