Stress Duck vs Protocol AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stress Duck
This app helps you manage daily stress and track your mood. It integrates with Apple Health to display health data like step count and sleep, offering a simple way to monitor your well-being and encourage happiness.
- Daily mood and stress status check
- Apple Health data integration
- View step count, sleep, and calorie info
- Privacy-focused data handling
- Encourages happiness and stress reduction
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We wave goodbye to the pressure in life and work, and let the pressure GO! GO! GO! Life is complicated enough, so we hope to bring you a simple and brisk interactive experience. We promise not to obtain any of your private information for uploading or sharing it with other third parties. Please feel free to use it as it will not cause you any new anxiety or irritability. Easily check your daily mood and stress status, adjust yourself every day, and remember to stay happy. Never punish yourself for other people’s mistakes~ Supports viewing partial health information for each week and specified days, Now supports viewing, step count, sleep, mindfulness, and calorie information. At last - The heart rate variability (HRV) and other heart rate-related data obtained are obtained with authorization from Apple Health. We only display them and do not store and forward them. Be sure to protect your privacy. - The data information provided in the APP is for reference only and is not recommended for use in any medical advice or diagnostic results. Before making any health-related decisions, always seek the advice of a physician; only a physician can make an accurate diagnosis of your individual situation. - Finally, I hope you say goodbye to stress. Come on~ Remember to authorize us to access your health data~
Protocol AI
This app acts as a personal training partner, offering intelligent recovery tracking and personalized workout plans. It helps users train smarter, recover effectively, and achieve fitness goals faster by providing insights into body readiness and performance metrics.
- Intelligent recovery tracking
- Personalized workout plans
- Body Battery readiness indicator
- Workout logging with rest timers
- Performance and sleep insights
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Unlock Your Full Potential with Protocol Protocol is your personal training partner, combining intelligent recovery tracking with goal-driven workout plans to help you train smarter, recover better, and hit your goals faster. Core Features: Know When to Push or Rest Your Body Battery shows exactly how charged you are, so you can plan intense sessions or take a recovery day with confidence. Personalised Training Plans From muscle gain to recomposition, Protocol builds bespoke 8–24 week programmes based on your goals and fitness level. Track Every Workout Log sets, reps, and weight with built-in rest timers, and see your progress week after week. Performance Insights Get a clear view of your recovery, sleep, strain, and activity to stay on track and avoid burnout. Train with purpose. Recover with precision. Achieve your best. Requires accurate Apple Health data. We recommend Apple Watch for best results, but any device that records heart rate, HRV, sleep, etc. into Apple Health will work.
Screenshots
Verdict
The clearest difference is in-app purchases: Stress Duck at none against Protocol AI's 8. Stress Duck also leads on update cadence (every 2 days vs every 4 days). Protocol AI's advantage is iOS requirement (15.1 vs 17.0). On price, review sentiment, 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
Both are free to download. Protocol AI sells 8 in-app purchases, starting at $4.99 per month. Stress Duck asks for nothing beyond the download.
Stress Duck ships an update every 2 days, Protocol AI every 4 days. The most recent releases landed on June 10, 2026 and September 16, 2026 respectively.
| Parameter | Stress Duck | Protocol AI |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 days — better | Every 4 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 27 MB | 52 MB |
| Age rating | 12+ | 4+ |
| Developer | 子龙 郭 | WARREN JAMES DAY |
Customer experience
Stress Duck
Protocol AI
In-app purchases
Stress Duck
No in-app purchases
Protocol AI
- Unlimited access3 Days trial$4.991 Month
- Unlimited access7 Days trial$4.991 Month
- Unlimited access$14.991 Month
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- Unlimited access3 Days trial$14.991 Month
- Unlimited access$39.991 Year
- Unlimited access3 Days trial$39.991 Year
- Unlimited access7 Days trial$39.991 Year
- Unlimited access$59.991 Year









