Comparison

STF Kronos vs Rex.life

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

Head to head
About

STF Kronos

This app syncs with your smartwatch to monitor your fitness performance across various sports. Track heart rate, steps, and sedentary periods to analyze your health metrics. It offers additional features based on your specific smartwatch model.

Highlights
  • Smartwatch synchronization
  • Sports performance monitoring
  • Heart rate tracking
  • Step counting
  • Sedentary period analysis
  • iOS Health App integration
Features
Read full description

Descarga, sincroniza y utiliza la aplicación STF Kronos para sacar el máximo provecho a las funciones de tu smartwatch. Ideal para monitorear tu desempeño en diferentes deportes como excursionismo, ciclismo, correr y caminata en interiores y exteriores. Mide y analiza las métricas de tu frecuencia cardiaca, pasos y periodos de sedentarismo. Consulta otras funciones de acuerdo a tu modelo de smartwatch. Integrates with iOS Health App.

About

Rex.life

This smart sports application tracks your fitness data and health status in real-time. It offers personalized exercise plans, holistic wellness support, and convenient workout tracking to help you achieve your health goals.

Highlights
  • Real-time health and activity monitoring
  • Personalized exercise plans
  • Holistic wellness support
  • At-home workouts
  • Sedentary reminders
  • Bluetooth device compatibility
Features
Read full description

Your Fitness Partner Welcome to Rex.Fit, the smart sports application designed to elevate your fitness journey. Compatible with Bluetooth devices, Rex.Fit offers real-time tracking of your sports data and health status. Real-Time Health and Activity Monitoring Rex.Fit excels in recording your daily activities and monitoring essential health metrics such as sleep quality. This data empowers you to make informed decisions about your fitness routine and overall health. Personalized Exercise Plans One of the standout features of Rex.Fit is its ability to create personalized exercise plans. Tailored to your specific fitness goals and current health status, these plans come with professional guidance, helping you achieve your fitness objectives with ease. Whether you aim to lose weight, build muscle, or improve your endurance, Rex.Fit has you covered. Holistic Wellness Support Rex.Fit embraces a holistic approach to fitness, incorporating movement, mindfulness, nutrition, rest, and connection. The app provides wellness tips, at-home workouts, and tools to support both your physical and mental well-being. It’s designed to help you progress towards your holistic fitness goals, ensuring a balanced and healthy lifestyle. Flexibility and Convenience No matter where you are—at home, on the go, or at the gym—Rex.Fit allows you to work out according to your schedule. Track your activities, set goals, and check your progress throughout the day. With features like message notifications, alarm reminders, and sedentary reminders, the app helps you build healthy habits effortlessly. Start Your Healthy Life Today Rex.Fit supports multiple languages and is simple to use, making it accessible to users around the globe. Embrace a healthier lifestyle with Rex.Fit—your ultimate fitness partner. Start your transformation today and discover wellness your way.

Screenshots

STF Kronos4 screens
Rex.life4 screens

Verdict

The call

The clearest difference is review sentiment: STF Kronos at 100% against Rex.life's 14%. STF Kronos also leads on rating (4.7 vs 3.3). On price, ratings volume, update cadence and ads 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

STF Kronos holds the better App Store score, 4.7 against 3.3. Both are backed by a comparable volume of ratings — 9 and 9 respectively. Written reviews point the same way: 100% of STF Kronos's written reviews are positive against 14% of Rex.life's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 20, 2026 and September 21, 2026 respectively.

Scorecard2 real differences · 8 level
STF Kronos versus Rex.life: the parameters behind the verdict, then further details
ParameterSTF KronosRex.life
PriceFreeFree
Rating4.7 (9 ratings) — better3.3 (9 ratings)
Positive reviews100.0% of reviews — better14.3% of reviews
Number of ratings99
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size228 MB185 MB
Age rating4+4+
DeveloperSTUFFACTORYShenzhen United Power Technology Co., Ltd.

Customer experience

STF Kronos

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Rex.life

All ratings9 ratings
Positive55.6%
Neutral11.1%
Negative33.3%
Written reviews21 reviews
Positive14.3%
Neutral9.5%
Negative76.2%

In-app purchases

None

STF Kronos

No in-app purchases

None

Rex.life

No in-app purchases

Questions

Is STF Kronos free?
STF Kronos is free to download, with no in-app purchases.
Is Rex.life free?
Rex.life is free to download, with no in-app purchases.
Which has better reviews, STF Kronos or Rex.life?
STF Kronos is rated higher. STF Kronos averages 4.7 out of 5 from 9 ratings, while Rex.life averages 3.3 from 9 ratings.
Do STF Kronos or Rex.life have ads?
Neither STF Kronos nor Rex.life shows ads.
Which is updated more often, STF Kronos or Rex.life?
STF Kronos ships an update every 2 months, and Rex.life every 2 months. Most recently, STF Kronos was updated on September 20, 2026 and Rex.life on September 21, 2026.

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