smartMFD by Guardian Avionics vs Decibel Meter Plus Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
smartMFD by Guardian Avionics
This app transforms your mobile device into a multifunction display for aircraft, showing flight data, engine performance, and navigation charts. It records flight data for later analysis and provides alerts for carbon monoxide levels and pulse oximetry when connected to compatible hardware.
- Multifunction display (MFD)
- Flight data recording and analysis
- Engine performance monitoring
- VFR/IFR charts and approach plates
- CO level alerts
- Pulse oximeter readings
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The Guardian Avionics smartMFD application for Apple iOS is what makes the smartPlane system a true budget-friendly multifunction display for your aircraft. Powered with data from the smartPlane product line, the smartMFD provides a user-friendly display of aircraft positional and attitude data, engine performance data, and VFR/IFR charts and approach plates for easy reference. The smartMFD app also provides CO level alerts and pulse oximeter readings (when connected to smartLink 555). The smartMFD application records all flight data and automatically uploads it to the smartData web app from Guardian Avionics -- allowing you to analyze engine performance trends and review past flight path data. When used with a smartPanel dock for the iPad or iPhone in your instrument panel - smartMFD can provide you everything you need in a multifunction display for a fraction of the cost of many others on the market. What can smartMFD do? ----- Easy to understand MFD display. GPS location, speed, altitude, and engine data recording with automatic uploading to smartCloud web app. Accurate airspeed and altitude data display. Attitude display with AHRS equipped smartPlane products. Configurable engine monitor display with custom warning thresholds. VFR & IFR sectional chart display with airport information and approach plates. METAR & TAF weather data with AIRMET/SIGMET map overlays. Carbon Monoxide level reporting and alerting when connected to smartPlane products. Pulse oximeter data display (smartLink 555 only). **Requires Guardian Avionics smartLink 554, 555, 650, or 851 for full functionality. --- App access to the health app data to fetch heart rate and blood oxygen level to show in the app. --- In-App Purchases: Plan 1 - DATA ACCESS It includes features like EIS, Engine gauges, Push Notification, iWatch Basic, 2D Map Weather, Chart VFR, Pilot logs. Graphs and Google Earth Plan 2 - VFR It includes all Plan 1 features + iWatch hearth rate and Flight Bag Plan 3 - VFR It includes all Plan 2 features + Chart IFR and Squawk Form Plan 4 - POWER USER It includes all Plan 3 features + Air Show for Passengers Plan 5 - Commercial User It includes all Plan 4 features + Multiple Aircraft users --- Price may vary by location. Subscriptions will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. You will not be able to cancel the subscription once activated. Manage your subscriptions in Account Settings after purchase. --- Privacy Policy: https://guardianavionicsdata.com/Device/PrivacyPolicy Terms of Service: https://guardianavionicsdata.com/Device/TermsConditions
Decibel Meter Plus Pro
Measure the sound levels around you with this utility app. It displays average, peak, and max values, offers decibel exposure time guidelines, and provides information on noise-induced hearing loss. The app also allows data recording and export for analysis.
- Measure sound levels
- Display average, peak, and max values
- Decibel exposure time guidelines
- Information on noise-induced hearing loss
- Record and export data
- Calibrate measurements
- Universal app support
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Decibel Meter Plus Pro turns your iPhone or iPad into a clean and easy-to-use sound level meter. Measure the noise around you in real time, view current, average, max, and peak dB readings, save measurement sessions, and export reports when you need to keep a record. Whether you want to check a quiet room, monitor everyday environmental noise, compare sound levels over time, or save a simple noise report, Decibel Meter Plus Pro gives you a clear and modern way to do it. KEY FEATURES • Real-time decibel meter View live sound levels with a large, easy-to-read meter. • Current, average, max, and peak values Quickly understand how sound levels change during a measurement session. • Live noise trend See noise changes over time instead of relying on a single number. • Save measurement sessions Keep useful sound level records for later review. • Session history Browse saved sessions with date, duration, average level, max level, and noise category. • Session reports Review key sound level stats, noise trend charts, location notes, and report details. • Export & share reports Export saved reports as an image, PDF, or CSV file. A limited number of free report exports is included. Unlock Unlimited Reports with a one-time purchase for unlimited exports. • Optional location saving Save location information only with sessions you manually save. • Calibration Adjust readings to better match a reference sound meter. • Noise level guide Learn common sound levels and tips for better measurements. • iPhone and iPad support Enjoy a redesigned interface that works beautifully on both iPhone and iPad. • 30+ languages The app is now localized for users around the world. • Privacy-friendly design Audio is processed on your device and is not uploaded. UNLIMITED REPORTS Unlimited Reports is an optional one-time unlock for users who want unlimited image, PDF, and CSV report exports. No subscription is required. SUPPORT If you have questions, feedback, or need help with purchases or report exports, please contact us at: ipixeltech@gmail.com IMPORTANT NOTE Decibel Meter Plus Pro uses the built-in microphone on your device. Readings are intended for general reference and everyday noise checks. For certified workplace testing, legal compliance, or professional acoustic measurement, please use certified sound level equipment.
Screenshots
Verdict
The clearest difference is price: smartMFD by Guardian Avionics at Free against Decibel Meter Plus Pro's $6.99. smartMFD by Guardian Avionics also leads on in-app purchases (none vs 1) and iOS requirement (13.0 vs 15.0). Decibel Meter Plus Pro's advantage is ratings volume (81 vs 3). On rating, update cadence, ads and device support 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
smartMFD by Guardian Avionics is free to download; Decibel Meter Plus Pro costs $6.99 up front. Decibel Meter Plus Pro sells 1 one-off in-app purchase. smartMFD by Guardian Avionics asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 3.7 for smartMFD by Guardian Avionics against 3.8 for Decibel Meter Plus Pro. That said, the two scores are not equally well evidenced: Decibel Meter Plus Pro has 81 ratings behind it against 3, so its average is the more settled of the two.
smartMFD by Guardian Avionics ships an update every 3 months, Decibel Meter Plus Pro every 2 months. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.
| Parameter | smartMFD by Guardian Avionics | Decibel Meter Plus Pro |
|---|---|---|
| Price | Free — better | $6.99 |
| Rating | 3.7 (3 ratings) | 3.8 (81 ratings) — better |
| Positive reviews | — | 52.8% of reviews |
| Number of ratings | 3 | 81 — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 121 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Co guardian llc | 华芳 张 |
Customer experience
smartMFD by Guardian Avionics
Decibel Meter Plus Pro
In-app purchases
smartMFD by Guardian Avionics
No in-app purchases
Decibel Meter Plus Pro
- Unlimited Reports$0.99
Questions
Is smartMFD by Guardian Avionics free?
Is Decibel Meter Plus Pro free?
Which has better reviews, smartMFD by Guardian Avionics or Decibel Meter Plus Pro?
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