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