TheoMeter vs Phone Diagnostics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TheoMeter
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TheoMeter helps you monitor sound levels, view live frequency spectrum activity, and document setup conditions from your iPhone. Designed for public-event and auditorium sound checks, TheoMeter combines a live dB meter with spectrum analysis tools, photo documentation, saved sessions, and exportable data. Use it to quickly understand room noise, monitor target levels, track peaks, and capture setup photos with optional dB overlays. Features include: -Live sound level meter with dBA, dBC, and dBZ weighting -Real-time frequency spectrum display -RTA bars, spline, and spectrogram views -Dominant frequency and selected band tracking -Fast, slow, and impulse response options -Leq, average, max, peak, and session duration stats -Dosimeter-style noise exposure view -Camera mode with sound-level overlay and filters -Save and export session data -Calibration offset controls -Clean navy, yellow, and white professional interface TheoMeter is ideal for sound technicians, event volunteers, venue setup teams, educators, presenters, and anyone who needs a clear view of sound levels and frequency behavior in a room. Note: TheoMeter uses the iPhone microphone for practical sound analysis. For compliance-grade measurements, use a professionally calibrated sound level meter.
Phone Diagnostics
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Professional Phone Diagnostics & Hardware Testing Check your phone, test its hardware, monitor device status, and create a detailed inspection report—all in one app. Whether you're checking your own device, troubleshooting a problem, or inspecting a used phone before purchase, this app gives you a convenient way to test and review your device. Comprehensive Hardware Tests Test essential phone components one by one: • Display and touchscreen • Front and rear cameras • Microphone and speakers • Vibration • Flashlight • Face ID / Touch ID • Compass • Network • Storage • CPU and performance • Sensors • Battery status Each manual test can be marked as: Pass / Abnormal / Skipped You can pause and resume an inspection at any time. Used Phone Inspection Buying a used phone? Run through the inspection checklist to check important hardware and device functions before completing a purchase. Review each test individually and create a complete inspection report when you're finished. One-Tap Device Check Quickly review key device information and status, including: • CPU • Memory • Storage • Network • Temperature • Battery status • Hardware • Sensors • System information Get a clear overview of your device without navigating through multiple system screens. Real-Time Monitoring Monitor important device information in real time, including CPU activity, memory, storage, network status, battery state and temperature-related information. Network Tools Built-in network utilities include: • Internet speed test • Ping test • DNS check • Network diagnostics • Port check • Network security tools • Test history Sensors & Utility Tools Check and use your device's compass, level, gyroscope, accelerometer, magnetometer, barometer and proximity sensor. Additional tools include QR code generation and scanning, password generation, flashlight and decibel measurement. Inspection Reports Generate a detailed device inspection report after testing. Save and share your report as an image or PDF, and keep previous reports for future reference. Widgets & Live Activities Use Home Screen and Lock Screen widgets to view important device information at a glance. Supported features also include Live Activities and Dynamic Island for selected device and network information. Important Information Some temperature, CPU, charging and battery-related information is based on publicly available iOS APIs, device state and software analysis. It may be estimated and should not be considered laboratory measurements or official Apple system data. Inspection results are based on user-confirmed test results and are not official certificates or professional device appraisal reports.
Screenshots
Verdict
The clearest difference is ads: TheoMeter at none against Phone Diagnostics's shown. Phone Diagnostics's advantage is iOS requirement (15.0 vs 17.0). On price, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | TheoMeter | Phone Diagnostics |
|---|---|---|
| Price | Free | Free |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Frankie Wellman | 珩 周 |
In-app purchases
TheoMeter
No in-app purchases
Phone Diagnostics
No in-app purchases
Questions
Is TheoMeter free?
Is Phone Diagnostics free?
Do TheoMeter or Phone Diagnostics have ads?
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