# Emerald Observatory for iPad vs Acc.elerometer

The clearest difference is monetization model: Acc.elerometer at free against Emerald Observatory for iPad's paid. Acc.elerometer also leads on device support (3 vs 1). Emerald Observatory for iPad's advantage is ratings volume (95 vs 1) and update cadence (every 5 months vs every 11 months). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Emerald Observatory for iPad against 5.0 for Acc.elerometer. That said, the two scores are not equally well evidenced: Emerald Observatory for iPad has 95 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 99% of Emerald Observatory for iPad's written reviews are positive against 100% of Acc.elerometer's.

Emerald Observatory for iPad ships an update every 5 months, Acc.elerometer every 11 months. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Emerald Observatory for iPad | Acc.elerometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (95 ratings)](https://appshunter.io/ios/app/emerald-observatory-for-ipad/id364904759/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/accelerometer/id1631020465/reviews)** |
| Number of ratings | **95** | 1 |
| Positive reviews | 98.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 11 months |
| Monetization | Paid | **Free** |
| Size | 16 MB | 18 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Bjorn Freeman-Benson](https://appshunter.io/developer/1766829089) | [Pantiukhin Andrei](https://appshunter.io/developer/1585711909) |

## What reviewers say

### Emerald Observatory for iPad

[App page](https://appshunter.io/ios/app/emerald-observatory-for-ipad/id364904759)

This app provides a comprehensive astronomical display on a single screen, offering detailed information about celestial bodies and timekeeping. It features a heliocentric orrery, rise and set times, twilight information, and moon phase details. Users can navigate through time and set alarms for astronomical events.

**Highlights:** Astronomical information display, Heliocentric orrery, Rise and set times for Sun, Moon, planets, Twilight times, Moon phase and orientation, World map of day/night regions, Eclipse simulator

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

**In-app purchases:** none

**What reviewers like**

- ✨ Visually stunning and beautiful design
- 💡 Extremely informative and data-rich
- 👍 Elegant and exquisite user interface
- 🚀 Flawless UX and intuitive design
- 🌟 Unique and nonpareil functionality

**What reviewers complain about**

- ⏳ Last update a year ago
- 🤔 Interface can be tough to decipher initially
- 🔄 Lack of recent updates
- 📱 Not available on iPhone/Apple Watch

**Requested features**

- Port to screen wallpaper
- Large wall clock version
- Apple TV version
- Support for Uranus, Neptune, and Pluto
- iPhone and Apple Watch versions


### Acc.elerometer

[App page](https://appshunter.io/ios/app/accelerometer/id1631020465)

Visualize and record device motion with live sensor readings. Analyze acceleration, rotation, magnetic field, and attitude. Export data as CSV for further analysis.

**Highlights:** Live sensor readings, Record experiments, Analyze results on iPhone/iPad, Capture motion on Apple Watch, Export data as CSV, Six measurement types

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Emerald Observatory for iPad free?

Emerald Observatory for iPad is free to download, with no in-app purchases.

### Is Acc.elerometer free?

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

### Which has better reviews, Emerald Observatory for iPad or Acc.elerometer?

Acc.elerometer is rated higher. Emerald Observatory for iPad averages 4.9 out of 5 from 95 ratings, while Acc.elerometer averages 5.0 from 1 ratings.

### Do Emerald Observatory for iPad or Acc.elerometer have ads?

Neither Emerald Observatory for iPad nor Acc.elerometer shows ads.

### Which is updated more often, Emerald Observatory for iPad or Acc.elerometer?

Emerald Observatory for iPad ships an update every 5 months, and Acc.elerometer every 11 months. Most recently, Emerald Observatory for iPad was updated on October 24, 2026 and Acc.elerometer on October 20, 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.*