Top Free Decibel Meter Apps in 2025

Whether you're worried about traffic noise, checking if your headphones are too loud, or measuring sound levels at an event — having a decibel meter in your pocket can be incredibly useful. The good news? You don’t need to buy an expensive sound level meter. In 2025, there are plenty of accurate and free decibel meter apps that work directly from your smartphone.

Here’s a detailed list of the top free decibel meter apps in 2025 that are user-friendly, trusted, and available for both Android and iOS.

📱 1. Decibel X (Android & iOS)

Decibel X continues to be one of the most popular sound meter apps in 2025. It offers a professional-grade interface with real-time dB readings, minimum/maximum levels, and a clean UI.

• Accurate and calibrated readings
• Real-time graphs with noise trends
• Works in both landscape and portrait modes
• Supports dBA and dBC weightings

Why people love it: Highly polished design and consistent accuracy across devices.

📲 2. Sound Meter – Smart Tools Co. (Android)

If you're on Android, Sound Meter by Smart Tools Co. is a classic favorite. It uses your phone’s built-in mic to display sound levels and shows historical max/min values.

• Visual graph of sound levels
• Shows decibel warnings (safe/danger zones)
• Simple layout, great for beginners

🌐 3. DecibelMeter.live (Browser-Based, All Devices)

Want to measure noise without installing anything? Try DecibelMeter.live — a browser-based online sound meter that works on all platforms.

• No app or sign-up required
• Works instantly on phones, tablets, or laptops
• Real-time decibel readings via your microphone

🎧 4. NIOSH Sound Level Meter (iOS Only)

Developed by the National Institute for Occupational Safety and Health (NIOSH), this app is designed for serious sound professionals but is also free for anyone to use.

• Highly accurate and lab-tested
• Displays real-time dB levels with time history
• Great for occupational safety measurement

🔊 5. SPL Meter – Studio Six Digital (iOS)

SPL Meter replicates a classic analog-style sound pressure level meter on your iPhone. It looks sleek and is easy to use, offering both peak and average dB levels.

• Analog-style dial display
• Supports calibration and mic settings
• Perfect for music studios and performers

📉 6. Sound Analyzer App (Android)

Sound Analyzer is more than just a decibel app — it shows frequency analysis, waveforms, and spectrum views.

• Detailed sound breakdown by frequency
• Useful for engineers, musicians, and audiophiles
• Records and stores noise data

🆓 7. Sound Meter – Splend Apps (Android)

This lightweight app offers clean, accurate noise readings and even tells you the type of environment you’re in (quiet library, normal conversation, traffic, etc.).

• Live meter + reference values
• Can save and share readings
• Minimal ads and simple layout

✅ What to Look For in a dB App

• Accuracy: Look for apps that offer calibration settings or verified data.
• User Interface: A clean layout helps you interpret readings faster.
• Extra Features: Logging, graphing, frequency analysis, or exporting data can be useful.
• Privacy: Choose apps that clearly state how they use your mic.

🔒 Are These Apps Accurate?

Smartphone microphones are not calibrated like professional devices, but for casual and educational use, modern dB apps are surprisingly reliable — especially if you only need an estimate or want to track noise trends.

🟢 Bonus Tip: Use DecibelMeter.live Instantly

✅ Just tap the link, allow mic access, and start measuring your environment instantly.

🎯 Final Thoughts

Whether you're managing your personal space, studying, recording music, or working in a noisy place, a decibel meter app can help you protect your hearing and reduce stress. With the powerful free apps listed above, you don't need to spend anything to start measuring sound around you in 2025.

Try a few, find your favorite, and stay in control of your sound environment.