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Detailed side-by-side comparison of specifications, features and latest prices in India.

Specification	Noise ColorFit Pulse 4 Max ₹2,499 Prices and availability may change on the seller's site View Price	Fire-Boltt Axiom ₹2,699 Prices and availability may change on the seller's site View Price	Boult Crown R Pro ₹1,999 Prices and availability may change on the seller's site View Price	Realme Watch S2 ₹2,799 Prices and availability may change on the seller's site View Price	Fastrack Astor FR2 Pro ₹2,799 Prices and availability may change on the seller's site View Price
General
In The Box	Smartwatch, Magnetic Charging Cable, User Manual, Warranty Card	Smartwatch, Wireless Charging Dock, User Manual, Warranty Card	Smartwatch, Magnetic Charging Cable, User Manual, Warranty Card	Smartwatch, Charging Cable, User Manual, Silicone Strap	Smart Watch, Magnetic Charging Cable, User Manual, Warranty Card
Model Name	ColorFit Pulse 4 Max / NSW-421	Fire-Boltt Axiom	Crown R Pro	Realme Watch S2	Fastrack Astor FR2 Pro
Launch Date	18/07/2024	15/09/2025	18/06/2023	30/07/2024	15/09/2024
Colors	Jet Black, Deep Wine, Rose Gold, Space Blue, Black Link, Calm Silver Link, Silver Link	Black, Silver, Orange, Gold	Frozen Silver, Thunder Black, Volcanic Orange	Midnight Black, Ocean Silver, Metallic Grey	Black, Silver, Rose Gold, Grey
Brand	Noise	FireBoltt	GoBoult	Realme	Fastrack
Display
Display Size	1.96, 4.98	1.43, 3.63	1.43, 3.63	1.43, 3.63	1.43, 3.63
Resolution	410, 502 pixels	466, 466 pixels	466, 466 pixels	466, 466 pixels	466, 466 pixels
Panel Type	AMOLED with 190 ppi	AMOLED	Super AMOLED	AMOLED with 326 ppi density	AMOLED
Touch Type	Capacitive multi-touch	Full Capacitive Touch	Full Touch	Capacitive multi-touch	Capacitive Touch
Always-on Display	Yes	Yes	Yes	Yes	—
Brightness	500-600 nits (estimated based on comparable models)	1000 nits (Peak)	600 nits	600 nits peak brightness	Not Specified
Refresh Rate	Standard AMOLED refresh rate	60Hz	60 Hz	60 Hz	Not Specified
Color Gamut / HDR Support	Full color AMOLED display	Not Specified	Not Specified	Full color AMOLED (HDR not specified)	—
Screen Protection	Curved tempered glass with anti-fingerprint coating	Flat Curved Glass	2.5D Curved Glass	7H scratch-resistant glass with Always-On Display support	Not Specified
Body
Dimensions	46.9 mm dial size	Standard 46mm dial size	46 x 46 x 11 mm (Approx)	46.5 x 46.5 x 11 mm	Not Specified
Weight	39 grams	60 g	56.5 g	41 grams	117 grams
Case Material	Metal with metallic finish	Stainless Steel / Metal Alloy	Zinc Alloy Frame	Zinc Alloy with electroplating and PVD coating	Stainless Steel
Front Protection	Curved tempered glass with anti-fingerprint coating	Curved Glass	Glass	7H Scratch-resistant glass	Not Specified
Strap / Bracelet Options	22mm silicone standard; metal mesh/chain and leather straps available separately	Silicone, Stainless Steel (variant dependent)	Silicone, Metallic (variant dependent)	Silicone (standard, removable) or Stainless Steel optional bands, 22mm width, 150-230mm length	Stainless Steel Strap
Removable / Replaceable Strap	Yes	Yes	Yes	Yes	—
Water Resistance	IP68 - Up to 1.5m depth	IP68 Water Resistant	IP67 Water Resistant	IP68 + 5 ATM (up to 5 meters for 30 minutes)	IP68
Dust Resistance	IP68 certified	IP68 Dust Resistant	IP67 Dust Resistant	IP68 dust and water resistant	Yes (IP68)
Durability Certifications	IP68 water and dust resistance certification	Not Specified	None	IP68 certified, Scratch resistant, Temperature range: -40°C to +70°C	Not Specified
Primary Controls	Functional rotating crown, side push button, touch screen	Rotating Crown, Touch Screen, Push Button	Touch Screen, Functional Crown, Push Button	Crown button on right side + 1 additional button + Capacitive touchscreen	Touch Screen, Functional Crown
Processor
Operating System	Proprietary Noise OS (compatible with iOS 11.0+ and Android 9.0+)	Proprietary RTOS	Boult OS (RTOS)	Proprietary RTOS (Real-Time Operating System)	Compatible with Android & iOS
Chipset / SoC	Not Specified	Single Core Digital Chipset	Single-chip 2-in-1 Bluetooth SoC	ATS3085S (Dual-mode Bluetooth processor with MCU + DSP architecture)	Not Specified
CPU Cores & Clock Speed	Not specified	Single Core	Not Specified	Dual-core MCU + DSP	Not Specified
GPU	Not Specified	Integrated	Not Specified	Not specified	Not Specified
Health & Fitness Sensors
Heart Rate Monitor	Yes - Optical PPG sensor with continuous and manual detection	Optical PPG Sensor	24/7 Heart Rate Monitor	24/7 continuous monitoring with abnormal HR alert	Yes, 24x7 Continuous monitoring
ECG	No ECG support	No	No	No ECG support	No
SpO₂ / Blood Oxygen	Yes - Optical SpO2 sensor	Yes	SpO2 Sensor	24/7 continuous blood oxygen monitoring	—
Skin Temperature Sensor	Not available	No	No	No skin temperature sensor	No
Sleep Tracking	Yes - Detailed sleep stages (Light, Deep, REM)	Yes (Light, Deep, REM)	Sleep Monitor (Light, Deep, REM)	24-hour sleep monitoring with sleep stage analysis (light, deep, REM)	Yes
Step Counter	Yes - Built-in pedometer	Yes	Yes	Yes - pedometer with step count tracking	Yes
GPS	No built-in GPS - Connected GPS only via smartphone	No (Connected GPS only)	Connected GPS	No GPS (no built-in or connected GPS)	Connected GPS (via smartphone)
Accelerometer	Yes	Yes	Yes	Yes - 3-axis accelerometer	Yes
Gyroscope	Yes	Not Specified	Not Specified	Yes - gyroscope sensor	Not Specified
Barometer	No	No	No	Yes - barometer for altitude tracking	Not Specified
Compass	No	No	No	Yes - compass sensor	Yes
Other Sensors	Calorie burn estimation, activity history, stress measurement, menstrual cycle tracking, VO2 Max	Sedentary Reminder, Hydration Reminder	Blood Pressure (Simulated), Menstrual Cycle Tracker, Breath Training	Ambient light sensor, altimeter, stress monitor (HRV-based), menstrual cycle tracker	Stress Monitor, Calorie Counter
Connectivity
Wi-Fi	No Wi-Fi support	No	No	No Wi-Fi	No
Bluetooth	Bluetooth 5.3	Bluetooth 5.0	Bluetooth 5.2	Bluetooth 5.3 with 10-meter connectivity range	Bluetooth 5.3
NFC	No	No	No	No	No
Cellular Connectivity	Wi-Fi Only (via smartphone)	No	No	Bluetooth only (no cellular, Wi-Fi, or satellite)	No (Bluetooth calling only)
ANT+	No	No	No	No	No
Battery
Capacity	300 mAh	300 mAh	Not Specified (Approx 250-300mAh)	380 mAh Li-ion non-removable	Approximately 280-300 mAh
Fast Charging Support	No fast charging support	No	No	Yes - approximately 60 minutes for full charge	Yes
Estimated Runtime	Up to 7 days typical use, 30 days standby	Up to 7 Days (Typical)	Up to 5 Days (Typical)	14 days typical use, 20 days with custom battery mode, 5 days with Always-On Display, 38 days standby	Up to 5 days
Charging Method	Magnetic 2-pin connector	Wireless Magnetic Dock	Magnetic Charging	Magnetic dock/wired connector	Magnetic charging cable
Battery Saver Modes	Yes - Screen brightness reduction and selective heart rate monitoring	Power Saver Mode	Yes	Customizable ultra-long battery mode, AI-optimized battery mode, time-only mode	Yes, multiple power saving modes available
Memory & Storage
RAM	Not specified	System RAM only	Not Specified	8 MB PSRAM	128 MB
Internal Storage	Not specified	No user accessible storage	Not Specified	4 GB Flash (500 MB user-accessible for music)	Not specified
Expandable Storage	No expandable storage	No	No	No microSD card slot	No
Design & Comfort
Bezel Type	Fixed bezel with metallic finish	Fixed with Rotating Crown	Fixed	Fixed circular bezel with watch-inspired design	Fixed bezel
Buttons / Crown	Functional mechanical crown + side push button	1 Rotating Crown, 1 Push Button	Rotating Crown + 1 Button	1 rotating crown button on right side + 1 additional action button	Functional Crown (rotatable) + Side button
Vibration Motor	Yes - Haptic feedback vibration alerts	Yes	Yes	Yes - haptic vibration motor	Yes
Screen Glass Type	Curved tempered glass	Glass	2.5D Glass	7H scratch-resistant mineral glass	Not Specified
Health & Safety Features
Fall Detection / SOS Calling	Yes - SOS technology with emergency calling	No	No	No fall detection or emergency SOS calling	SOS Calling Available
Menstrual Cycle / Health Tracking	Yes - Female health cycle tracker	Yes (Female Health Tracking)	Female Health Tracker	Yes - menstrual cycle tracking with prediction and period reminder	Not Specified
Noise Monitoring	No	No	No	Ambient volume monitoring (no formal noise exposure detection)	Not Specified
Guided Breathing / Mindfulness Features	Yes - Guided breathing practice feature	Breathing Exercises	Breath Training	Yes - guided breathing exercises and mindfulness reminders via Realme Link app	Stress Tracking Available
Audio & Voice
Built-in Speaker	Yes	Yes	Yes	Yes - up to 90 dB speaker with 10-meter microphone pickup in quiet environments	Yes
Microphone	Yes - Dual microphone setup	Yes	Yes	Yes - high-performance microphone for Bluetooth calling	Yes
Voice Assistant	Yes - AI Voice Assistant with AI Search feature	AI Voice Assistant (Siri/Google via Phone)	Yes (AI Voice Assistant)	Yes - ChatGPT 3.5 powered AI assistant with voice-controlled watch face generation	AI Voice Assistant
Bluetooth Audio Output	Yes - Bluetooth audio output for music control	Phone Calls Only	No	Yes - supports Bluetooth audio playback and streaming	Yes
Notifications & Controls
Notification Support	Call alerts, SMS/messaging alerts, social media app notifications	Call, SMS, WhatsApp, Social Media	Call, SMS, App Notifications	Call alerts, SMS/messaging alerts, app notifications, rich notifications	Yes (all smartphone notifications)
Quick Reply Options	Call rejection available (no voice/text reply)	No	No	Predefined messages only (no voice or custom text reply on watch)	Limited functionality (depends on phone OS)
Music Control / Playback	Yes - Play/Pause, Next/Previous Track, Volume Control	Music Control (Remote)	Music Control (Phone)	Play/Pause, Next/Previous track, Volume control, Local MP3 storage playback	Yes
Find My Phone	Yes - Find My Phone feature	Yes	Yes	Yes - Find My Phone feature via Realme Link app	Yes
Remote Camera Shutter	Yes - Remote camera control from watch	Yes	Yes	Yes - remote camera shutter control	Yes (camera control)
Security
Fingerprint Sensor	No	No	No	No	No
Face Unlock	No	No	No	No	No
NFC Payment Security	No NFC support - no contactless payments	No	No	No NFC payment capability	No (no NFC payment support)
Find My Watch	Not confirmed in specifications	Yes (via App)	Yes (via App)	Not officially specified	Yes (via companion app)
Ports & Accessories
Charging Connector Type	Magnetic 2-pin proprietary connector	Wireless Charging Dock	Magnetic Pogo Pin	Proprietary magnetic dock connector	Magnetic charging pins
Optional Docks / Stands	Magnetic charging dock available separately	None	None	N/A	None available
Bundled Extras	User manual, warranty card, charging cable	Charging Cable, Manual	Charging Cable, User Manual	Smartwatch, Charging Cable, User Manual, Silicone Strap; Extra straps available in multiple colors (sold separately)	Multiple strap color options available separately
Software & Apps
App Store Availability	NoiseFit App on Google Play Store and Apple App Store	No	None	Realme Link app - available on Google Play Store and Apple App Store	No dedicated app store
Customization Options	100+ cloud-based watch faces + AI Create feature for unlimited AI-powered custom watch face generation	100+ Cloud Watch Faces	150+ Watch Faces, Menu Styles	150+ cloud-based watch faces, AI-generated custom watch faces via voice commands, 110+ pre-loaded sports modes (expandable to 130+), customizable tiles and quick access shortcuts	100+ watch faces, customizable widgets
Companion App	NoiseFit App (iOS 11.0+ / Android 9.0+)	Fire-Boltt App / Da Fit	Boult Fit (GoBoult Fit)	Realme Link (Android & iOS compatible)	Fastrack Smart World App (Android & iOS)
OTA Updates	Yes - OTA updates supported	Yes	Yes	Yes - Over-the-Air updates supported	Yes (via companion app)
Pre-installed Apps	NoiseFit Health Suite, AI voice assistant, activity tracking, weather app, calculator, stopwatch, timer, alarm, reminder, music control	Alarm, Stopwatch, Timer, Weather, Calculator, Games	Alarm, Stopwatch, Weather, Calculator, Games	ChatGPT 3.5 assistant, 110+ sports modes with auto-recognition, 150+ watch face library, health monitoring apps (HR, SpO2, sleep, stress tracking), Realme Link companion app	100+ sports modes, health tracking, built-in games, calculator