Comparison

Decibel Meter Plus Pro vs Open Pi

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Open Pi

Manage your Raspberry Pi devices remotely without cloud services. Monitor system health, control Docker, run commands, transfer files, and manage GPIO from a modern, privacy-focused interface.

Highlights
  • Real-time system monitoring
  • SSH terminal access
  • Docker container management
  • GPIO control
  • File manager
  • Wake-on-LAN Helper
  • Remote system actions
Features
Read full description

Direct, local, and private Raspberry Pi management. Open Pi lets you monitor system health, manage Docker containers, and run SSH commands on your Raspberry Pi right from your phone. No cloud servers, accounts, or subscriptions. Built for homelabs, self-hosting, IoT projects, and software development. Key Features • System Health: Real-time CPU, RAM, storage, and temperature metrics • Docker Management: View, start, stop, and restart containers • Terminal: Secure SSH command-line access over local network or VPN • File Manager: Direct file uploads and downloads • GPIO Control: Monitor and toggle pins • Auto-Discovery: Detect devices automatically on local networks • System Actions: Wake-on-LAN helper, remote reboot, and alerts Privacy • Native SSH connection with no background agents • No accounts, tracking, or telemetry • Local-first architecture with zero subscriptions • All data stays on your local network

Screenshots

Decibel Meter Plus Pro4 screens
Open Pi4 screens

Verdict

The call

The clearest difference is review sentiment: Open Pi at 100% against Decibel Meter Plus Pro's 53%. Open Pi also leads on price (Free vs $2.99) and rating (4.4 vs 3.7). Decibel Meter Plus Pro's advantage is ratings volume (81 vs 9) and iOS requirement (15.0 vs 18.0). On ads, in-app purchases, monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Open Pi is free to download; Decibel Meter Plus Pro costs $2.99 up front. Decibel Meter Plus Pro sells 1 one-off in-app purchase and Open Pi sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Open Pi holds the better App Store score, 4.4 against 3.7. That said, the two scores are not equally well evidenced: Decibel Meter Plus Pro has 81 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 53% of Decibel Meter Plus Pro's written reviews are positive against 100% of Open Pi's.

UpkeepUpdate frequency

Decibel Meter Plus Pro ships an update every 2 months, Open Pi weekly. The most recent releases landed on October 18, 2026 and October 11, 2026 respectively.

Scorecard6 real differences · 4 level
Decibel Meter Plus Pro versus Open Pi: the parameters behind the verdict, then further details
ParameterDecibel Meter Plus ProOpen Pi
Price$2.99Free — better
Rating3.7 (81 ratings)4.4 (9 ratings) — better
Positive reviews52.8% of reviews100.0% of reviews — better
Number of ratings81 — better9
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size12 MB43 MB
Age rating4+4+
Developer华芳 张Artem Svitelskyi

Customer experience

Decibel Meter Plus Pro

All ratings81 ratings
Positive70.4%
Neutral3.7%
Negative25.9%
Written reviews127 reviews
Positive52.8%
Neutral7.9%
Negative39.4%

Open Pi

All ratings9 ratings
Positive77.8%
Neutral11.1%
Negative11.1%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Decibel Meter Plus Pro

One-time1
  • Unlimited Reports$4.99
2 purchases

Open Pi

One-time2
  • Single (Lifetime)$5.99
  • Family (Lifetime)$12.99

Questions

Is Decibel Meter Plus Pro free?
Decibel Meter Plus Pro costs $2.99, and also offers in-app purchases.
Is Open Pi free?
Open Pi is free to download, with in-app purchases available.
Which has better reviews, Decibel Meter Plus Pro or Open Pi?
Open Pi is rated higher. Decibel Meter Plus Pro averages 3.7 out of 5 from 81 ratings, while Open Pi averages 4.4 from 9 ratings.
Do Decibel Meter Plus Pro or Open Pi have ads?
Neither Decibel Meter Plus Pro nor Open Pi shows ads.
Which is updated more often, Decibel Meter Plus Pro or Open Pi?
Decibel Meter Plus Pro ships an update every 2 months, and Open Pi weekly. Most recently, Decibel Meter Plus Pro was updated on October 18, 2026 and Open Pi on October 11, 2026.

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