# phyphox vs Voice Spectrogram Logger

The clearest difference is review sentiment: phyphox at 79% against Voice Spectrogram Logger's 0%. phyphox also leads on rating (4.6 vs 1.0) and in-app purchases (none vs 1). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Voice Spectrogram Logger sells 1 one-off in-app purchase. phyphox asks for nothing beyond the download.

phyphox holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: phyphox has 276 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 79% of phyphox's written reviews are positive against 0% of Voice Spectrogram Logger's.

phyphox ships an update every 3 months, Voice Spectrogram Logger every 15 months. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | phyphox | Voice Spectrogram Logger |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (276 ratings)](https://appshunter.io/ios/app/phyphox/id1127319693/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462/reviews) |
| Number of ratings | **276** | 1 |
| Positive reviews | **78.7% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 15 months |
| Monetization | Free | Free |
| Best chart rank | **#208** | — |
| Size | 19 MB | 7 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [RWTH Aachen University](https://appshunter.io/developer/371466796) | [Yukiko Iwai](https://appshunter.io/developer/965630131) |

## What reviewers say

### phyphox

[App page](https://appshunter.io/ios/app/phyphox/id1127319693)

**Currently charting:** #208 Top Free · Education (US App Store)

Unlock your phone's sensors for scientific exploration. Conduct pre-built experiments or create your own using accelerometers, magnetometers, and more. Analyze and export data in various formats for further study.

**Highlights:** Pre-defined experiments, Data export (CSV, TSV, Excel), Web-based remote control, Custom experiment editor, Access to phone sensors, Advanced analysis functions

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💡 Access to phone sensors
- 🔬 Useful for physics experiments
- 📊 Data logging and export
- 🆓 Free and no ads
- 🤔 Sparks curiosity

**What reviewers complain about**

- 🐛 Bugs and crashes
- 📉 Inconsistent performance
- 🔒 App locks/minimizes recording
- ❓ Units not always clear
- ⚠️ Potential for device damage

**Reported bugs**

- App crashes on older devices
- Barometer not working on iOS 17.4
- Network error: Generic error
- Sound measurement curve disappears
- App crashes frequently

**Requested features**

- Add infrasound detector
- More units of measurement (G-force, PSI, feet)
- NFC/RFID support
- In-app bug report feature
- Allow other sensors via USB-C


### Voice Spectrogram Logger

[App page](https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462)

Visualize voice frequencies in a spectrogram from 20-2500Hz. Adjust display with sliders and log recordings to export as PNG files. Functions fully offline and supports background processing.

**Highlights:** Real-time voice spectrogram display, Adjustable frequency range (20-2500Hz), Zoomable spectrogram with pinch gestures, Customizable spectrogram gradation, Logging mode with history export, Offline functionality

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is phyphox free?

phyphox is free to download, with no in-app purchases.

### Is Voice Spectrogram Logger free?

Voice Spectrogram Logger is free to download, with in-app purchases available.

### Which has better reviews, phyphox or Voice Spectrogram Logger?

phyphox is rated higher. phyphox averages 4.6 out of 5 from 276 ratings, while Voice Spectrogram Logger averages 1.0 from 1 ratings.

### Do phyphox or Voice Spectrogram Logger have ads?

Neither phyphox nor Voice Spectrogram Logger shows ads.

### Which is updated more often, phyphox or Voice Spectrogram Logger?

phyphox ships an update every 3 months, and Voice Spectrogram Logger every 15 months. Most recently, phyphox was updated on October 12, 2026 and Voice Spectrogram Logger on October 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*