# phyphox vs Monad Calendar Clock

The clearest difference is review sentiment: phyphox at 79% against Monad Calendar Clock's 22%. phyphox also leads on price (Free vs $0.99) and rating (4.6 vs 3.7). Monad Calendar Clock's advantage is update cadence (every 6 weeks vs every 3 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

phyphox is free to download; Monad Calendar Clock costs $0.99 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 3.7. That said, the two scores are not equally well evidenced: phyphox has 272 ratings behind it against 14, 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 22% of Monad Calendar Clock's.

phyphox ships an update every 3 months, Monad Calendar Clock every 6 weeks. The most recent releases landed on September 27, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | phyphox | Monad Calendar Clock |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.6 (272 ratings)](https://appshunter.io/ios/app/phyphox/id1127319693/reviews)** | [3.7 (14 ratings)](https://appshunter.io/ios/app/monad-calendar-clock/id1437026437/reviews) |
| Number of ratings | **272** | 14 |
| Positive reviews | **78.9% of reviews** | 22.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | **Free** | Paid |
| Size | 19 MB | 266 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RWTH Aachen University](https://appshunter.io/developer/371466796) | [Earth at the Center LLC](https://appshunter.io/developer/1437026436) |

## 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


### Monad Calendar Clock

[App page](https://appshunter.io/ios/app/monad-calendar-clock/id1437026437)

This app visualizes time through planetary and celestial movements, contrasting natural rhythms with mechanical time. It offers unique perspectives on Earth's position in space and time, showing star and planet locations, seasonal changes, and lunar phases.

**Highlights:** Planetary time and date display, Celestial ring visualization, Heliocentric and Geocentric modes, Star and planet location tracking, Seasonal and lunar phase progression, Twilight and sunrise/sunset times, Event scheduling

**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 Monad Calendar Clock free?

Monad Calendar Clock costs $0.99, with no in-app purchases.

### Which has better reviews, phyphox or Monad Calendar Clock?

phyphox is rated higher. phyphox averages 4.6 out of 5 from 272 ratings, while Monad Calendar Clock averages 3.7 from 14 ratings.

### Do phyphox or Monad Calendar Clock have ads?

Neither phyphox nor Monad Calendar Clock shows ads.

### Which is updated more often, phyphox or Monad Calendar Clock?

phyphox ships an update every 3 months, and Monad Calendar Clock every 6 weeks. Most recently, phyphox was updated on September 27, 2026 and Monad Calendar Clock on September 6, 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.*