RunNerd vs Arc

RunNerd reads the runs you've already done and tells you what they mean. Same pace, lower heart rate. Faster, but working harder. Cadence slipping on the long ones. The things your numbers say when someone actually reads them. KNOW WHY EVERY RUN FELT THE WAY IT DID Every run gets a name, a read, and a receipt. Two short paragraphs from the coach on what happened and why, then elevation and pace on one chart with your heart-rate zones coloured along the hill. Tap a mile to see what it cost you. A PLAN FOR YOUR RACE DATE Tell the coach the race and the date. The plan builds around it, reads every run you finish, and adjusts the next one. Move a run, your plan adjusts. PRs WITH THE WHY A new personal record shows the old mark, how long it took, and what changed: heart rate at pace, cadence, conditions. Not just a time. YOUR WEEK AND MONTH, THE MORNING AFTER Weekly and monthly recaps on Home: miles, adherence, your best efforts, and one line on what the data says. Share any of it as a clean image. ASK ANYTHING A coach you can talk to. Why last week felt hard, what to do on today's run, whether you're on track for the race. WORKS WITH YOUR GEAR Apple Watch, Garmin, intervals.icu, and anything that writes to Apple Health. Your running history comes with you. NEW TO RUNNING? Pick a first goal, run your first mile or your first 5K, and let your phone guide the run out loud with run/walk intervals. No watch required. WHAT YOU GET - Named runs with a plain-English read on each one - Elevation and pace on one chart, heart-rate zones included - Personal records with what changed since the last one - Weekly and monthly recaps - Shareable receipts for runs, PRs and recaps - Race plans that adapt week to week - Easy, interval, long, and run/walk workouts - Guided runs with spoken cues - Weather-aware run recommendations Built by a lifter who became a runner and got tired of staring at numbers that didn't explain anything.

The AI coach that lives on your iPhone and Watch — not in someone's cloud. Now on iPhone Duo Arc builds you a real training plan across the sports you actually do — running, cycling, walking, swimming, and strength — then adapts it week to week based on how your body is responding. Unlike coaching apps that ship your data off to a server, Arc's AI coach runs privately on your device: offline, fast, and yours. Train the way you actually train Mix running, cycling, walking, swimming, and strength in one plan. Add or drop activities anytime and Arc folds them into your current block — no starting over. Meet your coach — now on your wrist Ask Arc anything: get a pre-session briefing, ask why today is easy, or check whether you're on track for your event — right from your Apple Watch. Answers are handled privately through Apple's on-device and Private Cloud Compute models. Show it a photo, too: snap a race elevation sign, a gym whiteboard, or a screenshot from another app, and Arc reads it and answers. A plan that adapts — and explains itself Arc watches your readiness, your training load, and how each session actually went, then adjusts the days ahead. Every suggestion comes with a "Why this?" breakdown showing the exact signals it weighed and which way each one pushed — no black box. Because life happens Injured, sick, traveling, or just need a break? Tell Arc from the Today screen and it reshapes your plan for you. Days off count as rest, not missed — and your event date never moves. When you're ready, ask Arc how to ease back in. Training built around your body • Cycle-aware readiness — if you track your cycle in Apple Health, Arc factors your phase into readiness and your weekly plan (read-only; nothing is ever written back). • Daily check-ins — muscle soreness, chafing, and saddle soreness feed your readiness score, so run and ride niggles both count. • Readiness at a glance — on your Lock Screen, in the Dynamic Island, and on your watch. Serious analytics, made readable See your Performance Management Chart — Fitness, Fatigue, and Form plotted together over time — so you can watch fitness build and freshness peak for your big day. Track your acute-to-chronic load balance in plain English before it turns into an overuse injury. Event day, dialed in Turn your goal time and course into an even-effort pacing plan that eases the climbs and lets you run — or ride — the descents. Arc even tells you whether your current fitness is on track for the goal. Got more than one event? Add your tune-up B and C races and Arc fits them into your build with a light taper and easy day around each. Fits your world • Log by swiping on Today, ask Siri, or tap a Control Center button • Personal records, achievements, and gear-mileage tracking • Pods — share progress and weekly challenges with friends • Fully localized in English and Spanish Arc Pro Free to start. Arc Pro unlocks the AI coach, the Performance Management Chart, event pacing, injury rebuilds, and more. Your AI endurance coach — prescriptive, adaptive, transparent, and private. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://largentlabs.com/arc/privacy.html