SimpleFFT vs PLD2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SimpleFFT
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This app can easily analyze the frequency of sound. For the sound of the recording file recorded at each refresh time interval, FFT is executed and displayed for the four voices collected one after another at each refresh interval.
PLD2
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PLD2 operates the 64seconds Pipeline Leak Detector (PLD) instrument. PLD2 records and analyzes sounds from underground pipelines and contact points, like hydrants, valves, and meters, from the PLD sensing unit (required hardware device). High resolution audio processing allows mobile users to discover and pinpoint pipeline leaks quickly and easily.
Screenshots
Verdict
The clearest difference is in-app purchases: PLD2 at none against SimpleFFT's 1. PLD2 also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 18 months). On price 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. SimpleFFT sells 1 one-off in-app purchase. PLD2 asks for nothing beyond the download.
SimpleFFT ships an update every 18 months, PLD2 every 3 weeks. The most recent releases landed on October 10, 2026 and September 29, 2026 respectively.
| Parameter | SimpleFFT | PLD2 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 18 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | HIROFUMI MARUO | 64seconds, Inc. |
In-app purchases
SimpleFFT
- Premium Functions$0.49
PLD2
No in-app purchases
