Comparison

Trajectory vs One Step Challenges

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

Head to head
About

Trajectory

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Trajectory focuses on long-term direction instead of daily noise, so you can stay consistent without overreacting. TRACK YOUR WEIGHT EFFORTLESSLY โ€ข Log your weight in seconds โ€ข Supports kg and lbs โ€ข Full history STAY ON COURSE โ€ข Set a target weight and deadline โ€ข See your personal trajectory line โ€ข Know exactly where you should be today UNDERSTAND YOUR BODY โ€ข BMI tracking with instant feedback โ€ข 7-day trend to spot momentum โ€ข Progress toward your goal CLEAN & FOCUSED โ€ข No subscriptions. Free. โ€ข Beautiful chart that tells the whole story Trajectory doesn't judge. It doesn't nag. It just shows you the path, and whether you're on it.

About

One Step Challenges

Features
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One Step Challenges is a fitness competition app built for friends and family who want to compete fairly across different fitness levels. Like a handicap in golf, each user gets a personal multiplier based on their own fitness โ€” so a beginner and a seasoned athlete can go head-to-head on equal terms. Points are weighted by individual capability, not raw output. Effort wins, not genetics. Your handicap isn't a guess. The moment you connect Apple Health, the app measures it from your last 30 days of real data โ€” daily steps, active minutes, resting heart rate, and time in elevated heart-rate zones. Your first week confirms it, and it recalibrates every 30 days as your fitness changes. Start a 7-day challenge, send your crew the invite link, and everyone competes on their own handicap. When a challenge ends, the first person to hit "Run it back" starts the rematch โ€” and everyone else joins that same one, so your crew stays together week after week. No one to compete with yet? Race a bot. Three opponents, each with a different training style, each with a week you can beat. Pick the one that sounds like you and go โ€” Brian walks, Doug trains most days, Amanda never misses. Or race your Shadow โ€” the you from your own last four weeks. Same routines, same pace, built from your real history. Beat your typical week and you win; win, and your Shadow gets stronger, so the bar rises every time you do. It's the one opponent always exactly your speed. Daily activity is tracked automatically through Apple Health: workouts with heart-rate zone analysis, steps, exercise minutes, and active calories. Log on-plan nutrition with a single tap โ€” no calorie counting. Build daily streaks for consistency. Leaderboards show standings across everyone in a challenge, and you'll know when someone joins, cheers you on, or a challenge wraps up. Key features: - Handicap-fair scoring that levels the field across fitness levels - Handicap measured from your real Apple Health data the moment you connect, recalibrated every 30 days - Heart-rate zone analysis on every workout - Steps, active minutes, active calories, and resting HR tracking - One-tap nutrition logging โ€” no calorie counting - Daily streaks for consistency - Multi-user challenges with shared invite links and codes - Crew rematches that keep everyone in the same challenge - Leaderboard and today feed - Reactions to cheer on the people you're competing with, with notifications when they land - End-of-challenge recaps so every finish gets its moment - Built for honest measurement, not gamification tricks Works with Apple Watch, Garmin, Whoop, Oura, Fitbit, or any device that writes to Apple Health โ€” the more your device shares with Apple Health, the more the app can score. Steps and nutrition work without a wearable. For feedback or support: onestepapp.feedback@gmail.com โ€”โ€”โ€” One Step Pro โ€” optional auto-renewable subscription: - One Step Pro (Monthly) โ€” $4.99 per month - One Step Pro (Annual) โ€” $34.99 per year Each plan includes a 14-day free trial for new subscribers. Payment is charged to your Apple ID at confirmation of purchase. Your subscription automatically renews unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID account settings. Any unused portion of a free trial is forfeited when you purchase a subscription. Terms of Use (EULA): https://onestepcollective.com/terms.html Privacy Policy: https://onestepcollective.com/privacy.html

Screenshots

One Step Challenges4 screens

Verdict

The call

The clearest difference is in-app purchases: Trajectory at none against One Step Challenges's 2. One Step Challenges's advantage is device support and iOS requirement (15.1 vs 18.5). On price there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. One Step Challenges sells 2 in-app purchases, starting at $4.99 per month. Trajectory asks for nothing beyond the download.

Scorecard3 real differences ยท 3 level
Trajectory versus One Step Challenges: the parameters behind the verdict, then further details
ParameterTrajectoryOne Step Challenges
PriceFreeFree
Update frequencyโ€”Every 3 days
Adsโ€”No
In-app purchasesNo โ€” betterYes
Devicesโ€”iPhone, iPod โ€” better
Requires iOS18.515.1 โ€” better
Further details โ€” not scored
Size2 MB30 MB
Age rating17+12+
DeveloperMathieu BonteJUSTIN MORGAN MAYEUR

In-app purchases

None

Trajectory

No in-app purchases

2 purchases

One Step Challenges

Subscriptions2
  • One Step Pro Monthly7 Days trial$4.991 Month
  • One Step Pro Annual7 Days trial$34.991 Year

Questions

Is Trajectory free?
Trajectory is free to download, with no in-app purchases.
Is One Step Challenges free?
One Step Challenges is free to download, with in-app purchases available.

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