SimpleFFT vs App4SHM
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.
App4SHM
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App4SHM is a smartphone application for structural health monitoring (SHM) of bridges or other civil structures to assess their condition after a catastrophic event or when required by authorities and stakeholders. The application interrogates the phone’s internal accelerometer to measure structural accelerations and applies artificial intelligence techniques to detect damage in almost real time. App4SHM resulted from academic research developed at Lusófona University, in particular the Civil Research Group and the Department of Computer Engineering and Information Systems.
Screenshots
Verdict
The clearest difference is in-app purchases: App4SHM at none against SimpleFFT's 1. App4SHM also leads on ads (none vs shown) and update cadence (every 4 months 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. App4SHM asks for nothing beyond the download.
SimpleFFT ships an update every 18 months, App4SHM every 4 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.
| Parameter | SimpleFFT | App4SHM |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 18 months | Every 4 months — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | HIROFUMI MARUO | COFAC |
In-app purchases
SimpleFFT
- Premium Functions$0.49
App4SHM
No in-app purchases
