Decibel X vs Link App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Decibel X
This tool transforms your device into a professional sound level meter, offering precise measurements of ambient noise. It features advanced calibration, frequency analysis, and data management for various applications, from personal curiosity to professional use.
- Pre-calibrated sound pressure level (SPL) measurements
- Frequency weighting filters (dBA, dBC, ITU-R 468)
- Apple Watch and Health App integration
- History data management with export options
- Dosimeter with NIOSH, OSHA standards
- FFT and BAR graphs for real-time frequency analysis
- InstaDecibel for sharing dB reports on photos
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"Decibel X" is one of very few noise meter apps on the market that has highly reliable, pre-calibrated measurements and supports dBA, dBC. It turns your iOS device into a professional sound level meter, precisely measures the sound pressure level (SPL) all around you. This extremely useful and beautiful tool will not only be a great tool for many uses but also bring you a lot of fun. Have you wondered how quiet is your room or how loud is a rock concert or sport event? "Decibel X" will help you answer all of those. WHAT MAKE IT GREAT AND STAND OUT FROM OTHER APPS: - Trusted accuracy: the app is tested and pre calibrated for all Apple devices. The precision is matching with real SPL devices - Apple Watch support: see noise level right from your wrist - Health App integration: export noise levels directly into Health app - Frequency weighting filters: ITU-R 468, A, B, C, Z - Powerful, smart history data management: + Recording data can be saved into a list of history records for future access and analysis + Each record can be exported as hi-res PNG graph or CSV text via sharing services + iCloud support which synchronize all history records across your Apple devices + Fullscreen mode to give overview the whole history of an record - Dosimeter with NIOSH, OSHA standards - Powerful calibration: Linear, Octave 1/1, 1/3, Load/save profile - FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed. - InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, Messages, etc.). - Support Live Activity, Dynamic Island - Support both Portrait and Landscape layouts - Beautiful, intuitive and carefully crafted UI design. Themes: LIGHT, DARK and CLASSIC OTHER GREAT FEATURES: - Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) AND IMPULSE (50 milliseconds) - MIC Gain Offset from -50 dB to 50 dB - Standard measurement range from 30 dBA up to 130 dBA - HISTO graph for plotted history of the recorded values - WAVE graph with 2 display modes: Rolling & Buffer - SPECTROGRAPH - Real time scale level chart - Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts - Quick reference text to help you compare with real-life examples NOTES: - Please do not expect a quiet room reading will be 0 dBA. The range 30-130 dBA is the standard usable range and an average quiet room will be about 30 dBA. - Although all devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. You will need a real external device or calibrated sound meter as a reference, then adjust the trimming calibration until the reading matches with the reference. * Privacy Policy: http://www.skypaw.com/decibelx/privacy_policy.html * EULA: http://www.skypaw.com/decibelx/terms.html
Link App
This app assists coffee roasters by recommending ideal roast profiles based on detailed coffee input. It offers advanced features for various coffee types and roasting conditions, ensuring optimal results.
- Algorithmic roast profile selection
- Altitude calibration
- Arabica advanced input
- All species mode for non-Arabica
- Advanced roast details
- Heirloom cupping for landrace varieties
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The Link App is the accompanying mobile application for the Link Sample Roaster by Nucleus Coffee Tools and Kaffelogic. Utilising this app, Link users can input a range of information about the coffee they wish to roast, and the app’s algorithmic profile selection will provide the most ideal recommendation for roast Profile Pack, Power Curve/Roast Profile, Suggested Development Range, Fan Action (fan speed), and the Expected First Crack for each coffee. The Link App also has several features to accommodate different coffee roasting scenarios, including Altitude Calibration, Arabica Advanced to input the screen size of coffees, All Species Mode for non-Arabica coffees, Advanced Roast Details for roast batch size, and Heirloom Cupping for landrace varieties.
Screenshots
Verdict
The clearest difference is in-app purchases: Link App at none against Decibel X's 5. Link App also leads on iOS requirement (11.0 vs 17.0). Decibel X's advantage is ratings volume (164K vs 5). On price, rating, review sentiment and update cadence there is nothing between them.
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. Decibel X sells 5 in-app purchases, starting at $1.99 per 7 days. Link App asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.6 for Decibel X against 4.6 for Link App. That said, the two scores are not equally well evidenced: Decibel X has 164K ratings behind it against 5, so its average is the more settled of the two. Written reviews split almost evenly too, at 66% and 67% positive.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.
| Parameter | Decibel X | Link App |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (164K ratings) — better | 4.6 (5 ratings) |
| Positive reviews | 66.3% of reviews | 66.7% of reviews — better |
| Number of ratings | 164K — better | 5 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 90 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | SkyPaw Co., Limited | Samuel Corra |
Customer experience
Decibel X
Link App
Bugs and requests
Decibel X
Reported bugs
3 issues- App crashes when deleting recordings
- Microphone issues on certain devices
- Saved files not accessible after updates
Requested features
5 requests- Add GPS coordinates to recordings
- Improve reporting and data export
- Provide more weighting options
- Extend frequency range
- Allow music playback while using the app
Link App
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Decibel X
- Weekly Membership$1.997 Days
- Monthly Membership$5.991 Month
- Annual Membership3 Days trial$49.991 Year
- ITU-R 468, A, B, C Weightings$1.99
- Data Export$2.99
Link App
No in-app purchases
Questions
Is Decibel X free?
Is Link App free?
Which has better reviews, Decibel X or Link App?
Do Decibel X or Link App have ads?
Which is updated more often, Decibel X or Link App?
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