MoonScope vs FFT Analyzer
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
MoonScope
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Typically, a lunar calendar shows the phases of the moon at noon on that day, as viewed from the center of the Earth. As a result, the moon phase calendar does not usually take into account the observer's location or the time of observation, and it is normal for the moon's appearance in the sky to not match the actual moon phase in the sky. MoonWatch is an app whose primary goal is to recreate the moon as it actually appears in the sky when you look up at it. That means it accurately recreates the sky conditions (sunrise, sunset, tri-light) at that location and time, the phases of the moon, moonrise, moonset, and the angle of the moon as it changes over time in 3D space. This means that the moon on the screen will match the actual moon in the sky, which you can easily find by using the tracking function to adjust the angle of your iPhone or iPad. With a premium subscription, you can also easily find the moon's appearance in places other than your current location. Normally, the lunar calendar shows the phases of the moon at noon on that day, but you can also freely change the time to obtain the lunar phase. Enjoy this simple yet highly functional lunar calendar that flexibly responds to a variety of needs by accurately recreating the solar system in 3D space.
FFT Analyzer
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FFT Analyzer is a powerful real-time spectrum analyzer for iPhone. It visualizes audio signals as a detailed frequency spectrum and waveform while presenting important measurements clearly. In addition to live microphone analysis, you can import and examine audio and video files from the Files app or Photo Library. Control playback directly from the waveform while the spectrum and measurements are recalculated for the current position. Key features: - Real-time FFT analysis using the microphone - Analysis of local audio and video files - Import from Files and Photo Library - Open compatible media directly from other apps - Interactive waveform with position slider - Play, pause, stop, and skip controls - Peak, RMS, and clipping indicators - Detection of dominant frequencies - Adjustable frequency and decibel ranges - Linear, logarithmic, and octave-based frequency axes - FFT bars, spectrum trace, and combined display - Waterfall and oscilloscope displays - Persistence, peak hold, and other visual effects - Customizable landscape layout - Extensive smoothing and level behavior settings - User interface in 18 languages File analysis also provides information such as duration, sample rate, channel count, peak values, and prominent frequency regions. Analysis remains synchronized with playback so you can inspect individual sections precisely. FFT Analyzer is designed for musicians, audio engineers, producers, educators, students, and anyone who wants to visualize and better understand audio signals. Processing takes place directly on your iPhone for fast and independent audio analysis tailored to the current signal. Export and reports Analysis results can be exported as a CSV file. The export includes the app version and a timestamp, file details and metadata, technical audio data, overall RMS, peak, and dynamic range values, dominant frequencies, detected findings, and time-based RMS, peak, and frequency values for each analysis frame.
Screenshots
Verdict
The clearest difference is price: MoonScope at Free against FFT Analyzer's $4.99. MoonScope also leads on update cadence (monthly vs every 4 months). FFT Analyzer's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
MoonScope is free to download; FFT Analyzer costs $4.99 up front. MoonScope sells 1 one-off in-app purchase. FFT Analyzer asks for nothing beyond the download.
MoonScope ships an update monthly, FFT Analyzer every 4 months. The most recent releases landed on September 20, 2026 and September 18, 2026 respectively.
| Parameter | MoonScope | FFT Analyzer |
|---|---|---|
| Price | Free โ better | $4.99 |
| Update frequency | Monthly โ better | Every 4 months |
| Ads | Yes | No โ better |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad โ better | iPhone |
| Requires iOS | 16.0 โ better | 17.6 |
| Further details โ not scored | ||
| Size | 161 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Hajime Suzuki | Kurenz Music GbR |
In-app purchases
MoonScope
- No Ads$4.99
FFT Analyzer
No in-app purchases





