Comparison

Decibel Meter X vs Spectrum Analyzer+ Audio FFT

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

Head to head
About

Decibel Meter X

This application precisely measures sound levels and analyzes audio spectrums. It can also generate specific frequency sounds for testing, research, or therapeutic purposes. Its intuitive interface makes sound exploration accessible to all users.

Highlights
  • Precise decibel level measurement
  • Audio spectrum analysis
  • Spectrogram display
  • Generate specific frequency sounds
  • Intuitive user interface
  • Detailed usage instructions
Features
Read full description

【Decibel Meter X】 - Your Expert in Sound Measurement and Spectrum Analysis! Sound is an indispensable element in life. The Decibel Meter X is not only a precise sound measurement tool, but also boasts powerful spectrum analysis capabilities, revealing the multidimensional details of sound. Additionally, the App offers the functionality to generate specific frequency sounds, enriching your journey of sound exploration. With the Decibel Meter X, you can easily obtain the decibel level of your current environment, understanding the intensity of noise. The spectrum analysis feature decomposes sound into its various frequency components, allowing you to delve deeper into the composition and characteristics of sound. Whether it's music, voices, or other sounds, the App can display their spectrograms, giving you a more intuitive understanding of sound. Moreover, the Decibel Meter X also has the capability to generate specific frequency sounds. You can set different frequencies and volumes to produce pure sound signals. This feature can be used for sound testing and research, as well as for sound therapy, musical instrument tuning, and various other scenarios, broadening the application of sound. Ease of use and a clear, intuitive interface are another highlight of the Decibel Meter X. Whether you're a beginner or a professional in sound measurement, you can easily get started and enjoy the fun of sound exploration. Additionally, we provide detailed usage instructions and customer support to ensure you have a seamless experience. Download the Decibel Meter X from the App Store now! Let it become your trusted assistant in sound measurement and spectrum analysis, allowing you to delve deeper into the world of sound and enjoy the infinite possibilities it brings!

About

Spectrum Analyzer+ Audio FFT

This utility transforms your device into a real-time audio frequency analyzer. It visualizes sound frequencies from 20 Hz to 20 kHz using the microphone, displaying amplitude and peak frequencies. It's designed for musicians, audio engineers, and sound enthusiasts.

Highlights
  • Real-time FFT audio spectrum visualization
  • Frequency range 20 Hz to 20 kHz
  • Peak frequency detection
  • Average dB level per band
  • Adjustable dB range
  • Dark theme
Features
Read full description

Spectrum Analyzer+ Audio FFT shows the live frequency spectrum of any sound your iPhone microphone hears, then lets you capture a 5-second average and read the result: the strongest frequency in Hz, the top components and where the energy sits. ▶ See the spectrum live • 32 bands from 20 Hz to 20 kHz, computed with a 2048-point FFT • Four views: Bars with peak hold, Line, Waterfall and Spectrogram • Peak frequency and peak level update as you listen • Min / Max traces in the Bars view, tap a bar for a cursor readout, freeze the display to study it • Adjustable dB range from 30 to 120 dB ▶ Capture 5 seconds, get an answer Tap Capture 5 s under the graph and hold the sound steady. The app power-averages the spectrum over five seconds and shows a result card: • Strongest component in Hz, with the musical note and cents in Voice mode • Up to three top components with their levels • Share of the detected energy in the low, mid and high part of the selected range • Strongest band level and the FFT resolution of the measurement If the sound is too quiet in that range, the card says so instead of inventing a peak. ▶ Compare before and after Save a capture as a reference (up to 10). Make a change — move a speaker, add treatment, adjust a machine — capture again in the same mode and the card shows the average band-level difference in dB. References can also be overlaid on the live spectrum. ▶ Pick the job • Voice: 80–4000 Hz, shows the note of the strongest pitch • Machine: 20–2000 Hz, looks for 50/60 Hz mains hum and its harmonics • Room: 20–500 Hz, the low end where room modes build up ▶ Export and share • Export a CSV of the live spectrum or of a 5-second capture • Share a short text summary of a capture ▶ Extras • Calibration offset from −20 to +20 dB in 0.5 dB steps to line up with a reference meter • Pink noise generator, unlocked for 24 hours by watching a short ad • Interface in 30 languages ▶ Good to know Levels are relative to the microphone's full scale (dBFS). A phone microphone is not a certified sound level meter, so use the numbers to find frequencies and compare changes, not for compliance measurements. Audio is analysed in memory while you listen and is not saved as a recording. For musicians checking a tone, home studio and hi-fi owners chasing a boomy note, and anyone tracking down a hum from a fridge, fan or transformer.

Screenshots

Decibel Meter X4 screens
Spectrum Analyzer+ Audio FFT3 screens

Verdict

The call

The clearest difference is rating: Decibel Meter X at 4.7 against Spectrum Analyzer+ Audio FFT's 2.3. Decibel Meter X also leads on ads (none vs shown) and ratings volume (56 vs 3). Spectrum Analyzer+ Audio FFT's advantage is update cadence (weekly vs every 4 weeks). On price, in-app purchases, device support and iOS requirement 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Decibel Meter X holds the better App Store score, 4.7 against 2.3. That said, the two scores are not equally well evidenced: Decibel Meter X has 56 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Decibel Meter X ships an update every 4 weeks, Spectrum Analyzer+ Audio FFT weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard5 real differences · 5 level
Decibel Meter X versus Spectrum Analyzer+ Audio FFT: the parameters behind the verdict, then further details
ParameterDecibel Meter XSpectrum Analyzer+ Audio FFT
PriceFreeFree
Rating4.7 (56 ratings) — better2.3 (3 ratings)
Positive reviews100.0% of reviews—
Number of ratings56 — better3
Update frequencyEvery 4 weeksWeekly — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better17.0
Further details — not scored
Size6 MB69 MB
Age rating4+17+
Developer永超 侯Kyu-Hee Jang

Customer experience

Decibel Meter X

All ratings49 ratings
Positive98.0%
Neutral2.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Spectrum Analyzer+ Audio FFT

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%

In-app purchases

None

Decibel Meter X

No in-app purchases

None

Spectrum Analyzer+ Audio FFT

No in-app purchases

Questions

Is Decibel Meter X free?
Decibel Meter X is free to download, with no in-app purchases.
Is Spectrum Analyzer+ Audio FFT free?
Spectrum Analyzer+ Audio FFT is free to download, with no in-app purchases.
Which has better reviews, Decibel Meter X or Spectrum Analyzer+ Audio FFT?
Decibel Meter X is rated higher. Decibel Meter X averages 4.7 out of 5 from 56 ratings, while Spectrum Analyzer+ Audio FFT averages 2.3 from 3 ratings.
Do Decibel Meter X or Spectrum Analyzer+ Audio FFT have ads?
Spectrum Analyzer+ Audio FFT shows ads; Decibel Meter X does not.
Which is updated more often, Decibel Meter X or Spectrum Analyzer+ Audio FFT?
Decibel Meter X ships an update every 4 weeks, and Spectrum Analyzer+ Audio FFT weekly. Most recently, Decibel Meter X was updated on October 24, 2026 and Spectrum Analyzer+ Audio FFT on October 25, 2026.

Other comparisons