Zone 2 Training Coach vs Cudex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zone 2 Training Coach
This app automatically tracks your Zone 2 heart rate minutes using your Apple Watch, helping you achieve your fitness goals. It provides insights into your cardio fitness, recovery, and progress over time, with optional advanced planning features.
- Automatic Zone 2 minute tracking
- Heart rate zone synchronization
- Live workout data on Apple Watch
- VO2 Max and cardio fitness insights
- Daily recovery scoring
- Educational articles on fitness
- Advanced weekly planning (Pro)
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Zone 2 Training Coach answers one question every week: did you get your Zone 2 minutes? It reads your heart rate from Apple Watch and counts every minute you spend in Zone 2, in workouts and outside them, like a brisk walk. You don't have to press start or log anything. Your weekly goal fills a ring on Home, and daily bars show how your week is going. ZONES THAT MATCH YOUR WATCH Zone 2 Training Coach uses the same heart rate zones as Apple's Workout app. On iOS 27 it reads your Watch's zones directly; on earlier iOS it estimates them the way Apple does. If you've had your zones tested, or your coach gave you numbers, enter your own. LIVE ON YOUR WRIST Start a Zone 2 workout on Apple Watch and get a big live heart rate, zone colors, a time-in-zone timer and a tap when you drift out of Zone 2. Your iPhone shows it live. Prefer Apple's Workout app? Send a Zone 2 workout there with a Zone 2 alert. TODAY A 24-hour heart rate and zone chart, your latest heart rate, and your Zone 2 minutes for the day, plus 7-day averages. CARDIO FITNESS See your VO2 max level for your age and sex, from Apple's Cardio Fitness estimate, compared with published reference data. IS MY ZONE 2 WORKING? Your Zone 2 minutes alongside your Cardio Fitness, resting heart rate and your speed at Zone 2 heart rate over time. RECOVERY A daily score from your HRV, resting heart rate and heart-rate recovery, compared with your own normal. LEARN Short, plain-English articles on Zone 2, heart rate zones and VO2 max. ZONE 2 PRO • Your next Cardio Fitness level, and a Zone 2 Coach that plans your week toward it around your schedule • Scheduled Zone 2 sessions with Apple Watch reminders • 3, 6 and 12-month progress • Full day-by-day history, 30 and 60-day averages, and 4 and 12-week trends • Custom weekly targets and the Wednesday nudge • Apple Watch complication and home-screen widgets PRIVATE BY DESIGN No account. Your health data stays on your iPhone. Zone 2 Training Coach doesn't sell or share your health data. Requires Apple Watch for heart rate data. Some features need newer software: reading your Watch's own zones needs iOS 27, and the coach's natural-language wording uses Apple Intelligence where available. Zone 2 Training Coach is for general fitness and is not a medical device. Talk to your doctor before starting a new exercise program. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Cudex
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There's a monster in here. Your steps collect more. Cudex turns your daily walking into a collection of monsters. Walk with your phone. Collect your steps. Hatch something new. Cudex is free to use, with no ads. Cudex Pro adds more. HOW IT WORKS • Your iPhone already counts your steps with Apple Health • Tap Collect in the app to turn today's steps into XP • XP raises your level, and every level hatches a new monster into your collection Every 100 steps is 1 XP. Steps you don't collect by midnight are gone, so the daily tap is the habit. Up to three reminders a day help you collect before the day ends. FREE FOR EVERYONE • 60 monsters to find, one every level • Streaks, badges and quests to chase • A history calendar of every day you've walked • Outfits and places for your monster from the shop, bought with coins you earn by walking • Share cards for a great day or a new monster • A daily step goal you set yourself WALK WITH FRIENDS Add friends with a code and see who has walked the most today. Tap a friend to see their monster, their collection and their badges. Friends is optional. Nothing is shared until you turn it on, and you can stop sharing at any time. WHAT CUDEX PRO ADDS • 48 rare monsters to find • Home screen and lock screen widgets, so you can collect without opening the app • Apple Watch complications • Insights: trends, consistency, your week, goal days and the hours you walk • The full shop of outfits and places YOUR STEPS, YOUR CHOICE Cudex reads step counts from Apple Health. Your steps stay on your phone unless you turn on Friends, and then only the friends you add can see them SUBSCRIPTION Cudex Pro is available as a monthly or yearly subscription, or as a one-time Lifetime purchase. If a free trial is offered, it converts to a paid subscription unless you cancel before it ends. Payment is charged to your Apple ID at confirmation of purchase. A subscription renews automatically unless you cancel at least 24 hours before the end of the current period. Manage or cancel it in your Apple ID settings. Collect monsters. Keep walking. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://acris.ai/monster-steps/privacy
Screenshots
Verdict
The clearest difference is update cadence: Cudex at every 5 days against Zone 2 Training Coach's fortnightly. Zone 2 Training Coach's advantage is iOS requirement (17.0 vs 26.5). On price, ads, in-app purchases 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
Both are free to download. Zone 2 Training Coach sells 3 in-app purchases, starting at $1.99 per month and Cudex sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Zone 2 Training Coach ships an update fortnightly, Cudex every 5 days. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.
| Parameter | Zone 2 Training Coach | Cudex |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Fortnightly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, Apple Watch |
| Requires iOS | 17.0 — better | 26.5 |
| Further details — not scored | ||
| Size | 25 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Jaron Shapiro | Siraj Hasanov |
In-app purchases
Zone 2 Training Coach
- Zone 2 Pro$1.991 Month
- Zone 2 Pro$14.991 Year
- Zone 2 Pro$34.99
Cudex
- Pro Month$4.991 Month
- Pro Year7 Days trial$29.991 Year
- Pro Lifetime$59.99









