Comparison

Submax vs Nudge

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Submax

Features
Read full description

The TBRS Submax App is an evidence-based tool designed to simplify administration of the Total Body Recumbent Stepper (TBRS) Submaximal Exercise Test. The app guides users through the testing protocol, captures test data in real time, and automatically calculates estimated aerobic fitness to support individualized exercise prescription. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ TBRS Submax is a data-recording and calculation tool intended for use by qualified exercise and health professionals. It does not measure, diagnose, or treat any medical condition, and its estimates are not a substitute for professional medical advice. Always consult a physician before beginning an exercise program or making any medical decision.

About

Nudge

Features
Read full description

APPLE WORKOUTS TRACKS YOUR ACTIVITY. NUDGE KEEPS YOU MOVING. Nudge is the Apple Watch companion that turns your daily step goal into a simple countdown. See exactly how many steps you have left, how long they’ll take, and whether you’re on pace to finish by your chosen time. Keep using Apple Workouts for your walks, runs, and workouts. Nudge adds the planning, motivation, and gentle reminders that help you build the habit of moving every day. Built for iPhone and Apple Watch, Nudge works with Apple Health to turn your daily step count into practical guidance you can use throughout the day. WHY PEOPLE LOVE NUDGE • Count down the exact number of steps you have left today • See how many walking minutes remain to reach your goal • Know whether you’re ahead, behind, or on pace • Set a daily goal and a “Finish By” time that fits your schedule • Review your daily and weekly progress to build lasting habits • Estimate calories burned from your walking activity • Receive optional reminders that help you stay on track • Celebrate when you reach your daily goal DESIGNED FOR APPLE WATCH Nudge was designed around the Apple Watch experience. Instead of opening your watch to rings, percentages, or complicated metrics, you see the one number that matters most: Steps Left Today. Swipe through simple views to check your countdown, review your progress, start a guided walk, or adjust your settings. Whether you have 800 steps or 8,000 remaining, Nudge helps you understand exactly what it will take to finish your day successfully. YOUR DAILY WALKING PLAN Big step goals can feel overwhelming. Nudge breaks them into something manageable. Based on your remaining steps, walking pace, and Finish By time, Nudge estimates how much walking you still need and suggests practical walk sessions to help you stay on track. One glance tells you whether you can finish with a quick walk now or whether it’s time for a catch-up walk before the day gets away from you. CONSISTENCY MATTERS MORE THAN INTENSITY Fitness isn’t about the occasional perfect workout. It’s about building the habit of moving every day. Review your daily and weekly history to see your progress, goal streaks, walking calories, and the days you reached your target. Small wins add up, and Nudge helps you see that progress over time. OPTIONAL REMINDERS Stay on track with helpful reminders throughout the day, including: • Morning briefings • Progress updates • Walk suggestions • Goal celebrations You’re always in control. Adjust reminder frequency, walking pace, Finish By time, and daily goals to match your routine. APPLE WATCH COMPLICATIONS Keep your progress visible throughout the day. Add Nudge complications to your favorite Apple Watch face and see your remaining steps, progress, or countdown with a quick glance, without opening the app. ONE WALK AT A TIME Whether your goal is 3,000 steps or 10,000, Nudge makes daily movement simple, visible, and achievable. Know exactly what’s left, take the next step, and build a habit that lasts. Nudge uses Apple Health, with your permission, to read step data. Calorie estimates and step recommendations are provided for general wellness purposes only and are not intended as medical advice.

Screenshots

Submax4 screens
Nudge2 screens

Verdict

The call

The clearest difference is in-app purchases: Nudge at none against Submax's 1. Submax's advantage is update cadence (every 2 days vs weekly) and iOS requirement (15.6 vs 17.0). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Submax sells 1 in-app purchase, starting at $3.99 per year. Nudge asks for nothing beyond the download.

UpkeepUpdate frequency

Submax ships an update every 2 days, Nudge weekly. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

Scorecard3 real differences · 3 level
Submax versus Nudge: the parameters behind the verdict, then further details
ParameterSubmaxNudge
PriceFreeFree
Update frequencyEvery 2 days — betterWeekly
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS15.6 — better17.0
Further details — not scored
Size24 MB5 MB
Age rating4+4+
DeveloperThe University of KansasChristopher Peluso

In-app purchases

1 purchases

Submax

Subscriptions1
  • TBRS Submax Yearly Subscription$3.991 Year
None

Nudge

No in-app purchases

Questions

Is Submax free?
Submax is free to download, with in-app purchases available.
Is Nudge free?
Nudge is free to download, with no in-app purchases.
Do Submax or Nudge have ads?
Neither Submax nor Nudge shows ads.
Which is updated more often, Submax or Nudge?
Submax ships an update every 2 days, and Nudge weekly. Most recently, Submax was updated on October 6, 2026 and Nudge on October 12, 2026.

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