Top 5 Budget Smartwatches Under $40 in 2025

Smartwatches have become essential gadgets for fitness tracking and notifications. The budget segment under $40 has seen remarkable improvements in 2025, offering features that were only available in premium watches just a couple years ago. Here are the best options available in India right now:

1. Noise ColorFit Pro 5

$39.64

Key Features:

• 1.85" HD display with 550 nits brightness
• 150+ watch faces with custom options
• SpO2, continuous heart rate and sleep monitoring
• 7-day battery life with power saving mode
• IP68 water and dust resistance

Pros

• Bright, colorful AMOLED display
• Accurate health tracking metrics
• Lightweight design (only 42g)
• Excellent companion app

Cons

• Limited third-party app support
• Plastic build feels less premium
• No built-in GPS

2. boAt Wave Call

$35.16

Key Features:

• Bluetooth calling with built-in microphone and speaker
• 1.69" square HD display
• Multiple sports modes (running, cycling, etc.)
• IP68 water resistance
• Quick reply messages

Pros

• Direct calling feature works well
• Good voice clarity during calls
• Comfortable silicone strap
• Vibrant display colors

Cons

• Battery drains faster with calling feature
• Limited smart features beyond calling
• No always-on display option

3. Fire-Boltt Ninja 3

$33.94

Key Features:

• 1.69" full touch display
• 100+ sports modes
• 24/7 heart rate monitoring
• IP68 water resistant
• 10 days battery life

Pros

• Excellent battery life
• Multiple sports modes
• Lightweight and comfortable
• Affordable price

Cons

• Basic display quality
• No SpO2 monitoring
• Limited smart features

4. Amazfit Bip U

$39.03

Key Features:

• 1.43" color display
• SpO2 and heart rate monitoring
• 60+ sports modes
• 5ATM water resistance
• 9-day battery life

Pros

• Excellent health tracking
• Good battery life
• Swimming-proof
• Lightweight design

Cons

• Slightly above $40 budget
• No calling features
• Limited third-party app support

5. Realme Watch 2

$38.85

Key Features:

• 1.4" large color display
• SpO2 and heart rate monitoring
• 90 sports modes
• IP68 water resistant
• 12-day battery life

Pros

• Large display
• Excellent battery life
• Comprehensive health tracking
• Good companion app

Cons

• Plastic build quality
• No calling features
• Limited watch faces

Buying Guide for Budget Smartwatches

When choosing a smartwatch under $40, consider these important factors:

1. Display Quality: Look for at least 400 nits brightness for outdoor visibility. AMOLED screens offer better contrast but IPS LCD can be good too.
2. Battery Life: Minimum 7-day battery in basic mode, 2-3 days with heavy usage. Check real-world reviews.
3. Health Sensors: Must have heart rate and SpO2 monitoring. More advanced models may include stress tracking.
4. Compatibility: Ensure it works with both Android and iOS if you might switch phones.
5. Build Quality: Metal frames last longer than plastic. Check strap quality and replacement options.
6. Water Resistance: IP68 rating means it can handle rain and splashes, but not swimming.