Bluetooth Toolkit vs Simple Spectrogram
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bluetooth Toolkit
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Using the smartphone or tablet to find and connect with the device via Bluetooth, and then change the name and PIN password. Send and receive the data from the smartphone or tablet.
Simple Spectrogram
Visualize sound frequencies in real-time with a dynamic spectrogram. Analyze audio, identify musical notes, and adjust display settings for detailed sound inspection. Audio processing is done entirely on-device, ensuring privacy.
- Real-time spectrogram visualization
- Logarithmic frequency scale
- Identify musical notes and frequencies
- Pause and inspect audio slices
- Adjustable frequency range and contrast
- Portrait and landscape support
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See the frequencies in the sound around you. Spectrogram turns your microphone input into a smooth, real-time spectrogram with a clear logarithmic frequency scale and Inferno colors. • Watch sound evolve over time, with the newest audio at the top. • Pause and tap any slice to inspect its frequency spectrum. • Tap or drag on the spectrum to find nearby peaks and their exact frequencies. • See the nearest musical note and the difference in hertz and cents, referenced to A4 = 440 Hz. • Adjust the frequency range, noise floor, and contrast. • Use portrait or landscape on iPhone and iPad. Audio is analyzed on your device in memory. It is never recorded, uploaded, or shared. No account, ads, or tracking. Musical note labels describe individual spectral peaks, which may be harmonics rather than a sound’s fundamental frequency.
Screenshots
Verdict
The clearest difference is iOS requirement: Bluetooth Toolkit at 13.0 against Simple Spectrogram's 17.0. On price, ads, 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 | Bluetooth Toolkit | Simple Spectrogram |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 10 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 19 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | DaWei Chou | DANIEL LAWRENCE LU |
In-app purchases
Bluetooth Toolkit
No in-app purchases
Simple Spectrogram
No in-app purchases
Questions
Is Bluetooth Toolkit free?
Is Simple Spectrogram free?
Do Bluetooth Toolkit or Simple Spectrogram have ads?
Other comparisons
