Decibel Meter vs Three9x
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Decibel Meter
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Decibel Meter - dB Comparison is a simple and practical sound level meter for measuring the noise around you in real time. Using your device’s microphone, the app estimates the current sound level and displays it in decibels, helping you better understand how loud your surroundings are. Use it to check everyday environments such as your home, office, classroom, workshop, street, or event space. Whether you want to compare noise levels, monitor a room, or get a quick sense of how loud a place is, Decibel Meter - dB Comparison gives you a clear and easy-to-read measurement. Key Features - Real-time sound level measurement - Decibel display using your device microphone - Simple, focused interface - Useful for everyday noise checks - No account required - Audio is processed on your device - No audio recording, uploads, or sharing Privacy Decibel Meter - dB Comparison is designed with privacy in mind. The microphone is used only to estimate nearby sound levels in real time. Audio is not recorded, stored, uploaded, or shared.
Three9x
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Use THREE9X APP to pair and synchronize smart glasses with mobile phones. Main functions: [Glasses operation] Connect the mobile phone and glasses via Bluetooth pairing to achieve precise control of the glasses system, such as adjusting volume, gesture settings, glasses system updates, etc. [Photo/video transmission] Use the glasses WIFI module to launch hotspots, support exporting, synchronizing, viewing, editing, sharing, and saving photos and videos taken by the glasses on the mobile phone; [AI voice assistant] Connect to the AI big model, and realize AI question and answer and AI object recognition under Bluetooth connection;
Screenshots
Verdict
Decibel Meter and Three9x are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Decibel Meter | Three9x |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 3 MB | 496 MB |
| Age rating | 4+ | 4+ |
| Developer | MIKE SPENGLER | THREE9X (SMC-PRIVATE) LIMITED |
In-app purchases
Decibel Meter
No in-app purchases
Three9x
No in-app purchases









