# phyphox vs GoodGeometry

The clearest difference is price: phyphox at Free against GoodGeometry's $3.99. phyphox also leads on rating (4.6 vs 1.2) and ratings volume (276 vs 5). On update cadence, ads, in-app purchases and device support there is nothing between them.

phyphox is free to download; GoodGeometry costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

phyphox holds the better App Store score, 4.6 against 1.2. That said, the two scores are not equally well evidenced: phyphox has 276 ratings behind it against 5, 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 64% of GoodGeometry's.

phyphox ships an update every 3 months, GoodGeometry every 2 months. Both last shipped on October 12, 2026.

## The numbers

| Metric | phyphox | GoodGeometry |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.6 (276 ratings)](https://appshunter.io/ios/app/phyphox/id1127319693/reviews)** | [1.2 (5 ratings)](https://appshunter.io/ios/app/goodgeometry/id6448868208/reviews) |
| Number of ratings | **276** | 5 |
| Positive reviews | **78.7% of reviews** | 64.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 19 MB | 1.3 GB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RWTH Aachen University](https://appshunter.io/developer/371466796) | [Birgit Stock](https://appshunter.io/developer/598299950) |

## What reviewers say

### phyphox

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

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


### GoodGeometry

[App page](https://appshunter.io/ios/app/goodgeometry/id6448868208)

Enhance geometry tasks within GoodNotes with infinitely zoomable tools, paper templates, and cover designs. Create custom templates and covers with editable patterns. Export your work as zoomable PDFs for versatile use.

**Highlights:** Infinitely zoomable geometric tools, Customizable paper templates, Editable cover designer, Zoomable PDF export, Multiple tool designs, GoodNotes and collection file formats

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

**In-app purchases:** none


## Frequently asked questions

### Is phyphox free?

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

### Is GoodGeometry free?

GoodGeometry costs $3.99, with no in-app purchases.

### Which has better reviews, phyphox or GoodGeometry?

phyphox is rated higher. phyphox averages 4.6 out of 5 from 276 ratings, while GoodGeometry averages 1.2 from 5 ratings.

### Do phyphox or GoodGeometry have ads?

Neither phyphox nor GoodGeometry shows ads.

### Which is updated more often, phyphox or GoodGeometry?

phyphox ships an update every 3 months, and GoodGeometry every 2 months. Most recently, phyphox was updated on October 12, 2026 and GoodGeometry on October 12, 2026.

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